This document outlines the syllabus for a course on Geographic Information Systems (GIS). It is divided into 5 units that cover fundamentals of GIS, spatial data models, data input and topology, data analysis, and applications of GIS. The objectives of the course are to introduce students to the basic concepts of GIS and provide an understanding of spatial data structures, management processes, and analysis tools.
Introduction to GIS - Basic spatial concepts - Coordinate Systems - GIS and Information Systems – Definitions – History of GIS - Components of a GIS – Hardware, Software, Data, People, Methods – Proprietary and open source Software - Types of data – Spatial, Attribute data- types of attributes – scales/ levels of measurements.
DEFINITION :
GIS is a powerful set of tools for collecting, storing , retrieving at will, transforming and displaying spatial data from the real world for a particular set of purposes
APPLICATION AREAS OF GIS
Agriculture
Business
Electric/Gas utilities
Environment
Forestry
Geology
Hydrology
Land-use planning
Local government
Mapping
11. Military
12. Risk management
13. Site planning
14. Transportation
15. Water / Waste water industry
COMPONENTS OF GIS
DATA INPUT
SPATIAL DATA MODEL
Data Model:
It describes in an abstract way how the data is represented in an information system or in DBMS
Spatial Data Model :
The models or abstractions of reality that are intended to have some similarity with selected aspects of the real world
Creation of analogue and digital spatial data sets involves seven levels of model development and abstraction
SPATIAL DATA MODEL
Conceptual model : A view of reality
Analog model : Human conceptualization leads to analogue abstraction
Spatial data models : Formalization of analogue abstractions without any conventions
Database model : How the data are recorded in the computer
Physical computational model : Particular representation of the data structures in computer memory
Data manipulation model : Accepted axioms and rules for handling the data
SPATIAL DATA MODEL
SPATIAL DATA MODEL
Objects on the earth surface are shown as continuous and discrete objects in spatial data models
Types of data models
Raster data model
vector data models
RASTER DATA MODEL
Basic Elements :
Extent
Rows
Columns
Origin
Orientation
Resolution: pixel = grain = grid cell
Ex: Bit Map Image (BMP),Joint Photographic Expert Group (JPEG), Portable Network Graphics(PNG) etc
RASTER DATA MODEL
VECTOR DATA MODEL
Basic Elements:
Location (x,y) or (x,y,z)
Explicit, i.e. pegged to a coordinate system
Different coordinate system (and precision) require different values
o e.g. UTM as integer (but large)
o Lat, long as two floating point numbers +/-
Points are used to build more complex features
Ex: Auto CAD Drawing File(DWG), Data Interchange(exchange) File(DXF), Vector Product Format (VPF) etc
VECTOR DATA MODEL
RASTER vs VECTORRaster is faster but Vector is corrector
TESSELLATIONS OF CONTINUOUS FIELDS
Triangular Irregular Network: (TIN)
TIN is a vector data structure for representing geographical information that is continuous
Digital elevation model
TIN is generally used to create Digital Elevation Model (DEM)
DIGITAL ELEVATION MODEL
DATA STRUCTURES
Data structure tells about how the data is stored
Data organization in raster data structures
Each cell is referenced directly
Each overlay Is referenced directly
Each mapping unit is referenced directly
Each overlay is separate file with general header
Introduction to GIS - Basic spatial concepts - Coordinate Systems - GIS and Information Systems – Definitions – History of GIS - Components of a GIS – Hardware, Software, Data, People, Methods – Proprietary and open source Software - Types of data – Spatial, Attribute data- types of attributes – scales/ levels of measurements.
DEFINITION :
GIS is a powerful set of tools for collecting, storing , retrieving at will, transforming and displaying spatial data from the real world for a particular set of purposes
APPLICATION AREAS OF GIS
Agriculture
Business
Electric/Gas utilities
Environment
Forestry
Geology
Hydrology
Land-use planning
Local government
Mapping
11. Military
12. Risk management
13. Site planning
14. Transportation
15. Water / Waste water industry
COMPONENTS OF GIS
DATA INPUT
SPATIAL DATA MODEL
Data Model:
It describes in an abstract way how the data is represented in an information system or in DBMS
Spatial Data Model :
The models or abstractions of reality that are intended to have some similarity with selected aspects of the real world
Creation of analogue and digital spatial data sets involves seven levels of model development and abstraction
SPATIAL DATA MODEL
Conceptual model : A view of reality
Analog model : Human conceptualization leads to analogue abstraction
Spatial data models : Formalization of analogue abstractions without any conventions
Database model : How the data are recorded in the computer
Physical computational model : Particular representation of the data structures in computer memory
Data manipulation model : Accepted axioms and rules for handling the data
SPATIAL DATA MODEL
SPATIAL DATA MODEL
Objects on the earth surface are shown as continuous and discrete objects in spatial data models
Types of data models
Raster data model
vector data models
RASTER DATA MODEL
Basic Elements :
Extent
Rows
Columns
Origin
Orientation
Resolution: pixel = grain = grid cell
Ex: Bit Map Image (BMP),Joint Photographic Expert Group (JPEG), Portable Network Graphics(PNG) etc
RASTER DATA MODEL
VECTOR DATA MODEL
Basic Elements:
Location (x,y) or (x,y,z)
Explicit, i.e. pegged to a coordinate system
Different coordinate system (and precision) require different values
o e.g. UTM as integer (but large)
o Lat, long as two floating point numbers +/-
Points are used to build more complex features
Ex: Auto CAD Drawing File(DWG), Data Interchange(exchange) File(DXF), Vector Product Format (VPF) etc
VECTOR DATA MODEL
RASTER vs VECTORRaster is faster but Vector is corrector
TESSELLATIONS OF CONTINUOUS FIELDS
Triangular Irregular Network: (TIN)
TIN is a vector data structure for representing geographical information that is continuous
Digital elevation model
TIN is generally used to create Digital Elevation Model (DEM)
DIGITAL ELEVATION MODEL
DATA STRUCTURES
Data structure tells about how the data is stored
Data organization in raster data structures
Each cell is referenced directly
Each overlay Is referenced directly
Each mapping unit is referenced directly
Each overlay is separate file with general header
Gis Geographical Information System FundamentalsUroosa Samman
Gis, Geographical Information System Fundamentals. This presentation includes a complete detail of GIS and GIS Softwares. It will help students of GIS and Environmental Science.
Mumbai University, T.Y.B.Sc.(I.T.), Semester VI, Principles of Geographic Information System, USIT604, Discipline Specific Elective Unit 1: Introduction to GIS
Understanding Coordinate Systems and Projections for ArcGISJohn Schaeffer
Everything you need to know to work with coordinate systems and projecting data in ArcGIS. The presentation starts by explaining the terminology, and then discusses the details you need to know to actually work successfully with coordinate systems, use the proper projections, and geographic transformations. This is a very practical look at a complex subject.
This document help you to prepare Triangulation Network (TIN), Hillshade Map, Slope map, interpolation and Digital Elevation Model (DEM) in a area and how to interpret them.
Topics:
1. Introduction to GIS
2. Components of GIS
3. Types of Data
4. Spatial Data
5. Non-Spatial Data
6. GIS Operations
7. Coordinate Systems
8. Datum
9. Map Projections
10. Raster Data Compression Techniques
11. GIS Software
12. Free GIS Data Resources
GIS and Remote Sensing to study urban-rural transformation during a fifty-yea...Maurizio Pollino
C. R. Fichera, G. Modica, M. Pollino (2011).
Presented at "Computational Science and Its Applications - ICCSA 2011 International Conference", Santander, Spain, June 20-23, 2011.
A relevant issue in Remote Sensing (RS) and GIS is related to the analysis and the characterization of Land Use Land Cover (LULC) changes, very useful for a wide range of environmental applications and to efficiently undertake landscape planning and management policies. The methodology described has been applied to a case-study conducted in the area of the Province of Avellino (Southern Italy). Firstly, aerial photos and Landsat imagery have been classified to produce LULC maps for a fifty-year period (1954÷2004). Then, through a GIS approach, change detection and spatiotemporal analysis has been integrated to characterize LULC dynamics, focusing on the urban-rural gradient. This study has shown that LULC patterns and their changes are linked to both natural and social processes whose driving role has been clearly demonstrated: after the disastrous Irpinia earthquake (1980), local specific zoning laws and urban plans have significantly addressed landscape changes.
Gis Geographical Information System FundamentalsUroosa Samman
Gis, Geographical Information System Fundamentals. This presentation includes a complete detail of GIS and GIS Softwares. It will help students of GIS and Environmental Science.
Mumbai University, T.Y.B.Sc.(I.T.), Semester VI, Principles of Geographic Information System, USIT604, Discipline Specific Elective Unit 1: Introduction to GIS
Understanding Coordinate Systems and Projections for ArcGISJohn Schaeffer
Everything you need to know to work with coordinate systems and projecting data in ArcGIS. The presentation starts by explaining the terminology, and then discusses the details you need to know to actually work successfully with coordinate systems, use the proper projections, and geographic transformations. This is a very practical look at a complex subject.
This document help you to prepare Triangulation Network (TIN), Hillshade Map, Slope map, interpolation and Digital Elevation Model (DEM) in a area and how to interpret them.
Topics:
1. Introduction to GIS
2. Components of GIS
3. Types of Data
4. Spatial Data
5. Non-Spatial Data
6. GIS Operations
7. Coordinate Systems
8. Datum
9. Map Projections
10. Raster Data Compression Techniques
11. GIS Software
12. Free GIS Data Resources
GIS and Remote Sensing to study urban-rural transformation during a fifty-yea...Maurizio Pollino
C. R. Fichera, G. Modica, M. Pollino (2011).
Presented at "Computational Science and Its Applications - ICCSA 2011 International Conference", Santander, Spain, June 20-23, 2011.
A relevant issue in Remote Sensing (RS) and GIS is related to the analysis and the characterization of Land Use Land Cover (LULC) changes, very useful for a wide range of environmental applications and to efficiently undertake landscape planning and management policies. The methodology described has been applied to a case-study conducted in the area of the Province of Avellino (Southern Italy). Firstly, aerial photos and Landsat imagery have been classified to produce LULC maps for a fifty-year period (1954÷2004). Then, through a GIS approach, change detection and spatiotemporal analysis has been integrated to characterize LULC dynamics, focusing on the urban-rural gradient. This study has shown that LULC patterns and their changes are linked to both natural and social processes whose driving role has been clearly demonstrated: after the disastrous Irpinia earthquake (1980), local specific zoning laws and urban plans have significantly addressed landscape changes.
Geographic Information System for Bachelor in Agriculture EngineeringDinesh Bishwakarma
This slide tells about the basic of the Geographic Information System and use of GIS and Remote Sensing in Agriculture
for more details goto www.dineshbishwakarma.com.np
my youtube channel : https://www.youtube.com/c/L%C3%B8stB%C3%B8y/videos
Introduction to various GIS software, google earth. Intro types, types of maps, map projections and hands on to Q GIS software. Introduction to latitude longitude system, shape file generation, geo referencing and digitization.
basic concept of geographic data,GIS and its component,data acquisition ,raster, vector formats,spatial data,topology and data model data output ,GIS applications
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The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
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2. Syllabus
UNIT I FUNDAMENTALS OF GIS 9
Introduction to GIS - Basic spatial concepts - Coordinate Systems - GIS and
Information Systems – Definitions – History of GIS - Components of a GIS – Hardware,
Software, Data, People, Methods – Proprietary and open source Software - Types of data –
Spatial, Attribute data- types of attributes – scales/ levels of measurements.
UNIT II SPATIAL DATA MODELS 9
Database Structures – Relational, Object Oriented – ER diagram - spatial data models –
Raster Data Structures – Raster Data Compression - Vector Data Structures - Raster vs
Vector Models TIN and GRID data models - OGC standards - Data Quality.
UNIT III DATA INPUT AND TOPOLOGY 9
Scanner - Raster Data Input – Raster Data File Formats – Vector Data Input –Digitiser –
Topology - Adjacency, connectivity and containment – Topological Consistency rules –
Attribute Data linking – ODBC – GPS - Concept GPS based mapping.
UNIT IV DATA ANALYSIS 9
Vector Data Analysis tools - Data Analysis tools - Network Analysis - Digital Education
models - 3D data collection and utilisation.
UNIT V APPLICATIONS 9
GIS Applicant - Natural Resource Management - Engineering - Navigation - Vehicle
tracking and fleet management - Marketing and Business applications - Case studies.
3. Text Books
1. Kang - Tsung Chang, Introduction to Geographic
Information Systems, McGraw Hill Publishing, 2nd Edition,
2011.
2. Ian Heywood, Sarah Cornelius, Steve Carver, Srinivasa
Raju, “An Introduction Geographical Information Systems,
Pearson Education, 2nd Edition,2007.
4. Course Objectives
To introduce the fundamentals and components of
Geographic Information System
To provide details of spatial data structures and input,
management and output processes.
Course Outcomes
Have basic idea about the fundamentals of GIS.
Understand the types of data models.
Gain knowledge on data quality and standards.
Get knowledge about data input and topology.
Gain knowledge on various data analysis tools.
Understand data management functions and data output
5. Unit-wise CO mapping
CO’s AIMED CO 1 CO 2 CO 3 CO 4 CO 5 CO 6
UNIT 1 3
UNIT 2 3 3
UNIT 3 3
UNIT 4 3
UNIT 5 3
7. A geographic information system (GIS) is
a system of hardware, software, data,
people, organization and institutional
arrangement for collecting, storing, analyzing
and disseminating information about areas of
the Earth.
A geographic information system (GIS) is
a computer system for capturing, storing,
checking, and displaying data related to
positions on Earth's surface.
A geographic information system (GIS) is
a system designed to capture, store,
manipulate, analyze, manage, and present all
types of geographical data.
8. Geographic information system (GIS) is
defined as an information system
designed to work with data referenced by
spatial / geographical coordinates.
Every object present on the earth can be
“geo referenced”, is the fundamental key
of associating any database to GIS.
Geo- referencing refers to the location of
a layer of coverage in space defined by
the co-ordinate reference system.
9.
10. What is a GIS?
A means of storing,
retrieving, sorting,
and comparing
spatial data
to support some
analytic process.
+
Information System
Geographic Position
15. Basic spatial concepts
A Geographic Information system(GIS)
is a system of computer application that
can be used to display, manipulate and
analyze spatially varied information
from multiple sources all in one place
GIS dataset can be separated into two
categories:
1. Spatial or Geographical information
2. Tabular or Attribute information
16. 1. Spatial or Geographical information
Spatial data is data that is geo-referenced
or location specific shown graphically on the
computer screen. Each piece of graphical
information is called features which can be
points, line or polygon.
2. Tabular or Attribute information
It is the text based or numerical
information that describe each of the features.
The tabular information is linked to the
graphical information which includes a Unique
ID number used to represent each point, line or
polygon. Ex. of tabular data can include such
things as addresses, coordinates, area, length,
sales information, road names, etc.
17. Spatial data
(ARC functions)
Attribute data
(INFO or TABLES functions)
1 (Universe polygon)
2 3
4 5
GIS Storage
3
COV# ZONE ZIP
1 0
2 C-19 22060
3 A-4 22061
4 C-22 22060
5 A-5 22057
3 A-4 22061
18. Types of spatial data
Raster data
It is in the form of images such as aerial
photographs or imported scans of old maps.
The raster data stores the location and color
value of each pixel that forms the image.
Vector data
The information is stored using a
combination of location specific point, lines or
Arcs.(XY Coordinates)
Raster images can loss quality and become
blurred when scaled. However, Vector data is
scalable to any size without losing any
integrity.
20. Representing Spatial Elements
Raster
Stores images as rows and columns of numbers with a
Digital Value/Number (DN) for each cell.
Units are usually represented as square grid cells that are
uniform in size.
Data is classified as
“continuous” (such as in an
image), or “thematic”
(where each cell denotes a
feature type.
Numerous data formats
(TIFF, GIF, ERDAS.img etc)
21. Vector
Allows user to specify specific spatial locations and
assumes that geographic space is continuous, not
broken up into discrete grid squares
We store features as sets of X,Y coordinate pairs.
Representing Spatial Elements
22. Entity Representations
Points - simplest
element
Lines (arcs) - set of
connected points
Polygons - set of
connected lines
We typically represent objects in space as
three distinct spatial elements:
We use these three spatial elements to represent real world features and attach
locational information to them.
31. Coordinate Systems
Coordinate system is a reference system for
identifying locations on the curved surface of the
earth.
Locations on the earth’s surface are measured in
angular units from the center of the earth relative
to two planes: the plane defined by the equator
and the plane defined by the prime meridian
(which crosses Greenwich England). A location is
therefore defined by two values: a latitudinal value
and a longitudinal value.
Coordinate Systems for Chennai
13.0827° N, 80.2707° E
Coordinate Systems for Canada
56.1304° N, 106.3468° W
32. Locations on the earth’s surface are
measured in angular units from the
center of the earth relative to two
planes:
1. the plane defined by the
equator(latitude value)
2. the plane defined by the prime
meridian.(longitude value)
33. A map projection bridges the two
types of coordinate systems(x and y
coordinates)
The process of projection transforms
the Earth’s surface to a plane, and
the outcome is a map projection,
ready to be used for a projected
coordinate system.
36. The angular measures of longitude and latitude may be
expressed in degrees-minutes-seconds (DMS),
decimal degrees (DD), or radians (rad). Given that 1
degree equals 60 minutes and 1 minute equals 60
seconds, we can convert between DMS and DD. For
example, a latitude value
of 45°52'30" would be equal to 45.875° (45 + 52/60 +
30/3600). Radians are typically used in computer
programs. One radian equals 57.2958°, and one
degree equals 0.01745 rad.
37. Datum
Mammoth collection of monument
locations in the late 1800s. Researchers
installed brass or aluminum disks at each
reference location. Each monument location
was connected using mathematical
techniques like triangulation
NAD27 - North American Datum of 1927 . It
is a network of standardized horizontal
positions on North America. Researchers
gathered approximately 26,000 stations in
the United States and Canada. At each
station, surveyors collected latitudes and
longitude coordinates
38. NAD83 - Researchers benchmarked
approximately 250,000 stations. This set
of horizontal positions formed the basis
for the North American Datum of 1983
(NAD83). In 1983, the NAD27 datum
was eventually replaced with NAD83. It
provides latitude and longitude and
some height information
WGS84 - Unifying a Global Ellipsoid
Model with GPS. The radio waves
transmitted by GPS satellites enable
extremely precise Earth measurements
across continents and oceans.
39. MAP PROJECTION
A map projection transforms the geographic
coordinates on an ellipsoid into locations on a
plane. The outcome of this transformation
process is a systematic arrangement of
parallels and meridians on a flat surface
representing the geographic coordinate
system.
Three types of map projections are
Cylindrical
Conic
Azimuthal
44. Common Map Projection
Robinson Projection
Transverse Mercator Projection
Lambert Conformal Conic
Space Oblique Mercator
45. Robinson Projection
• World maps “look right” rather than
measure precisely.
• Used in many popular maps such
as the Rand McNally series (from
the 1960s) and the National
Geographic Society (since 1988)
46. Transverse Mercator Projection
The Transverse Mercator projection is
widely used around the world and works
especially well for mapping areas smaller
than a few degrees longitudinally, such as
a state or country
47. Lambert Conformal Conic
This projection is one of the best to use
for middle latitudes and is often used for
aeronautical charts, aviators, and maps
with wide east-west extents
48. Space Oblique Mercator
This map projection was developed fairly
recently, in 1976, for the specific
purpose of mapping of imagery from an
orbiting satellite around the ellipsoidal
Earth
50. GIS and INFORMATION SYSTEM
In a GIS, user
connect data with geography.
Geographic Information Systems really
comes down to just 4 simple ideas:
Create geographic data
Manage it.
Analyze it and…
Display it on a map.
It’s REALLY hard to visualize the locations
of latitudes and longitudes coordinates
from a spreadsheet.
51. But when user add these positions on
a map, it’s like magic to the reader.
52. GIS and INFORMATION
ARCHITECTURE
The Architecture (structure) of a GIS
can be split into three main
components,
1. A user-interface / client: allows the user to
interact and use GIS tools through a graphical
user interface (GUI).
2. An application engine / server: the collection of
tools available for the user to manipulate and
analyze GIS data
3. A database: the data stored as files or web
services and the associated database
management software
55. COMPONENTS OF GIS
Five Components of Geographic
Information System are:
◦ Hardware
◦ Software
◦ Data
◦ People
◦ Methods
56.
57. 1.Hardware: Hardware is Computer on which
GIS software runs.
Main Hardware Components are:
Motherboard
Hard Drive
Processor
RAM
Printer
External Disk
Monitor
58. 2.Software: Next component is GIS
software which provide tools to run and
edit spatial information.
It helps to query, edit, run and display
GIS data.
It uses RDBMS (Relational Database
Management System) to store the
data.
Few GIS software list: ArcGis, ArcView
3.2, QGIS, SAGA GIS.
59. Software Components:
GIS Tools: Key tools to support the
browsing of the GIS data
RDBMS
Query Tools
GUI: Graphical User Interface that helps
user and Software to interact well.
Layout: Good layout window to design
map.
60. 3.Data: The most important and expensive
component of the Geographic Information
System is Data which is generally known
as fuel for GIS.
GIS Data Types:
Raster: Raster image store information
in a cell based manner.
Vector: Vector data are discrete. It store
information in x, y coordinate format.
There are three types of Vector data:
Lines, Points and Area.
61. 4.People: People are user of
Geographic Information System. They
run the GIS software.
5. Methods: For successful GIS
operation a well-designed plan and
business operation rules are important.
63. Proprietary and Open-source
GIS Software
GIS software is broadly classified in two types
1. Proprietary GIS Software or Commercial
2. Open-source GIS Software
Proprietary Software:
Proprietary software, also known as "closed-source
software", is a non-free computer software for
which the software's publisher or another person
retains intellectual property rights
Open source Software:
The term "open source" refers to something people
can modify and share because its design is publicly
accessible.
64. Some examples of Proprietary Software and Open source
Software are given in the table below:
S.No Proprietary GIS Software Open Source GIS Software
1 ESRIs ArcGIS GeoDa
2 AutoCAD Map3D and
Autodesk Geospatial
GRASS
3 Bentley Map gvSIG
4 GeoMedia ILWIS
5 Global Mapper MapWindow
6 Manifold System OpenJump
7 MapInfo QGIS
8 Maptitude SAGA GIS
9 Smallworld uDig
10 TerrSet
66. TYPES OF DATA
A geodatabase is a database that is in
some way referenced to locations on the
earth.
GIS data can be separated into two
categories: spatially referenced data
which is represented by vector and raster
forms (including imagery) and attribute
tables which is represented in tabular
format. Within the spatial referenced data
group, the GIS data can be further
classified into two different types: vector
and raster.
67.
68. Every house, every tree, every city
has its own unique latitude and
longitude coordinates.
The two primary types of spatial data
are vector (Discrete) and raster
(Continuous) data.
69. Discrete versus continuous data
A second subdivision of the values
assigned to each cell are the values
representing discrete or continuous data.
Discrete data
Discrete data, sometimes called
categorical data, most often represents
objects. These objects usually belong to a
class (for example, soil type), a category (for
example, land-use type), or a group (for
example, political party).
Discrete data is best represented by
ordinal or nominal numbers.
70. Continuous data
A continuous raster dataset or surface can
be represented by a raster with floating-
point values (referred to as a floating-point
raster dataset) or occasionally by integer
values.
The value for each cell in the dataset is
based on a fixed point (such as sea level),
a compass direction, or the distance of
each location from a phenomenon in a
specified measurement system (such as
the noise in decibels monitored at various
sites near an airport).
71. Vector data
Vector data is not made up of a grid of
pixels. Instead, vector graphics are
comprised of vertices and paths.
The three basic symbol types for
vector data are points, lines and
polygons (areas).
72. Points
Vector points are simply XY coordinates.
Generally, they are a latitude and longitude
with a spatial reference frame.
In this case, maps often use points to
display cities.
73. Lines
Vector lines connect each vertex with paths.
Basically, connecting the dots in a set order
and it becomes a vector line with each dot
representing a vertex.
For example, maps show rivers, roads and
pipelines as vector lines
74. Polygons
When user join a set of vertices in a particular order
and close it, this is now a vector polygon feature.
In order to create a polygon, the first and last
coordinate pair are the same.
For example, a building footprint has a square
footage and agricultural fields have acreage.
75.
76. Raster Data
Raster data is having two types; one is the grid
type data, another one is the image type
data. They are usually regularly-spaced and
square .
Rasters often look pixelated because each pixel
has its own value or class.
Now each cell in case of grid we call as a cell,
in case of image we call as pixel.
So, each cell will represent one attribute one
value it may be in case of remote sensing data,
it may be reflection value, it may be emitted
value, it may be temperature value, or in normal
case may be rainfall value or any other value,
but only single value per cell or per pixel.
78. Difference between Image and
Grid
Characteristics Image Cell
Unit Pixel Cell
Value Only positive integers Both positive and
negative integers
79. Pixel value
For a grayscale and color images, the
pixel value is a single number that
represents the brightness of the pixel.
The most common pixel format is the
byte image, where this number is stored
as an 8-bit integer giving a range of
possible values from 0 to 255.
Typically zero is taken to be black, and
255 is taken to be white.
To represent color images, separate red,
green and blue (RGB)components must
be specified for each pixel.24 Bit
integer(255,255,255)
81. Difference between Vector and
Raster
Characteristic Vector Structure Raster Structure
Data Structure Complex Simple
Ease of learning Difficult ; Software is complex Ease
Positional Precision Can be very precise and accurate Precision increased with increase
data storage
Attribute Precision Good for polygon, line and point
data. Not good for continuous data
Good for continuous data
Analysis capability Good for spatial query. Analysis
limited to intersections.
Not good for spatial query but good
for spatial analysis and filtering
Storage requirement Relatively small but complex Relatively large and simple but may
be complex
Cost Inexpensive Expensive
Output Map quality Very good – Looks like a map Poor
Ability to work with image data Poor – Data can be vectorized first Good
83. TYPES OF ATTRIBUTES
Each geographic feature has one or more
attributes that identify what the feature is,
describe it, or represent some magnitude
associated with the feature.
In point data, it will have spatial
information of x,y coordinates. It can have
n number of attributes. For an example,
about ground water well, who owns the
well, what is the depth of well, what are
the different levels during monsoon,
premonsoon, postmonsoon and water
quality.
84. There are two components to GIS data:
spatial information (coordinate and
projection information for spatial
features) and attribute data. Attribute
data is information appended in tabular
format to spatial features.
The spatial data is the where and
attribute data can contain information
about the what, where, and
why. Attribute data provides
characteristics about spatial data.
85. Types of Attribute Data
character,
integer,
floating,
date, and
BLOB.
86. Character Data
The character property (or string) is for
text based values such as the name of a
street or descriptive values such as the
condition of a street.
For example, a character field may contain
the categories for a street: avenue,
boulevard, lane, or highway.
87. A character field could also contain the
rank, which is a relative ordering of
features.
For example, a ranking of the traffic load of
the street with “1” being the street with the
highest traffic.
Character data can be sorted in ascending
(A to Z) and descending (Z to A) order.
Since numbers are considered text in this
field, those numbers will be sorted
alphabetically which means that a number
sequence of 1, 2, 9, 11, 13, 22 would be
sorted in ascending order as 1, 11, 13, 2,
22, 9.
88. Numeric Data
Integer and floating are numerical values
Within the integer type, there is a further
division between short and long integer
values.
Floating point attribute values
store numeric values with fractional
values. Therefore, floating point values
are for numeric values with decimal
points
89. Numeric values will be sorted in
sequentially either in ascending (1 to 10)
or descending (10 to 1) order.
Numerical value fields can have
operations performed such as
calculating the sum or average
value. Numerical field values can be a
count (e.g. the total number of students
at a school) or be a ratio (e.g. the
percentage of students that are girls at a
school).
90. Date/Time Data
Date fields contains date and time values.
BLOB Data
BLOB stands for binary large object and
this attribute type is used for storing
information such images, multimedia, or
bits of code in a field.
92. Scales of Measurements
Attribute measurement scales for spatial
data, including map scale (expressed as
a representative fraction), coordinate
grids, and map projections
1. Ratio
2. Interval
3. Ordinal / Rank
4. Nominal / Category
5. Cyclic
6. Counts and amounts
93. Ratio
The values from the ratio measurement
system are derived relative to a fixed zero
point on a linear scale.
Mathematical operations can be used on
these values with predictable and
meaningful results. Examples of ratio
measurements are age, distance, weight,
and volume.
94. Interval
Time of day, calendar years, the Fahrenheit
temperature scale, and pH values are all
examples of interval measurements.
95. Ordinal / Rank
Ordinal values determine position. These
measurements show place, such as first,
second, and third, but they do not
establish magnitude or relative proportions
Knowing the winners only by place, user
do not know how much faster the first-
place runner was compared with the
second-place runner.
96. Nominal / Category
Values associated with this measurement
system are used to identify one instance from
another. They may also establish the group,
class, member, or category with which the
object is associated.
These values are qualities, not quantities,
with no relation to a fixed point or a linear
scale.
Other nominal values are social security
numbers, ZIP Codes, and telephone
numbers.
97. Directional /Cyclic
In GIS, it is sometimes necessary to
deal with data that can be directional or
cyclic, including flow direction on a map
or a compass direction or longitude.
Example:
◦ In earth Rotation , Number follows 359 is 0
◦ In week ,Saturday follows Sunday
98. Counts and amounts:
Counts and amounts shows total
numbers. A count is the actual number
of features on the map. An amount can
be any measurable quantity associated
with feature.
Example: District wise population in
map
100. HISTORY OF GIS
GIS – At first
Was just a combination of ideas from
quantitative cartography, and the
computer systems that existed at that
time.
was basically the work of cartographers
and geographers who tried to adapt their
knowledge and their needs to a
technology that looked promising.
Since then, a large number of other
disciplines have contributed to the field of
GIS.
101. HISTORY OF GIS
Map making – Middle East –
Babylonian Clay tables – 1000 B.C.
200 B.C – Erathosthenes calculated the
circumference of Earth
Ptolemy and I-Idrisi
Mercator and Newton
French cartographer – Louis Alexandre
Berthier – drawn the maps of the battle
of Yorktown (1781) – Hinged overlays
to show troop movements
104. EARLY DEVELOPMENT OF GIS
Canada GIS (CGIS)
set up in mid 1960s by Roger Tomlinson and
colleagues for Canadian Land Inventory.
developed as a measuring tool (to measure
area), a producer of tabular information rather
than a mapping tool.
Harvard Laboratory
The Harvard laboratory for Computer Graphics
and Spatial Analysis was established in 1964 by
Howard Fisher at Harvard University.
The GIS packages developed were SYMAP,
CALFORM, SYMVU, GRID, POLYVRT,
ODYSSEY.
105. EARLY DEVELOPMENT OF GIS
Dual Independent Map Encoding (DIME)
Developed by US Bureau of Census in 1967 to
conduct the 1970 census of population.
Digital records of all US streets were created to
support automatic referencing and aggregation
of census records.
Environmental Systems Research Institute
(ESRI)
Jack Dangermond founded ESRI in 1969 to
undertake GIS projects.
In 1981, ESRI launched ArcInfo (major
commercial GIS software system) based on
vector & relational database data model.
106. DEVELOPMENT OF GIS
In the beginning of seventies,
Conferences and symposiums about GIS took
place.
GIS included in University curricula.
ESRI founded.
In eighties
Special journals and forums in GIS.
In 1981, ESRI launched ArcInfo (major
commercial GIS software system) based on
vector & relational database data model.
First open source GIS software – GRASS in
1985
In the beginning of 21st Century
Google Maps
107. HISTORY OF GIS
3 main areas
The evolution of technology
The evolution of data
The evolution of theories and techniques
108. The evolution of technology
Graphical outputs
Data access and storage
Data input
Software
Internet
1993 - Xerox PARC – the first map server
1994 – First digital online Atlas – the Canadian
National Atlas
Web 2.0 – Web mapping
109. The evolution of data
First dataset – scanned maps and
digitized features
Launching of Earth observation satellites
1982 - SPOT Image – the first commercial
company to distribute satellite images that
cover the entire globe.
1981 – GPS system completely operative
110. GIS Software
1976 – USGS publishes the first Digital
Elevation Model (DEM)
In 2000 – elevation data from Shuttle
Radar Topographic Mission (SRTM)
LiDAR
1994 – NSDI - US
Europe – INSPIRE
OGC – homogenize and standardize
111. The evolution of theories and
techniques
Spatial analysis
1854 – John Snow – First analytical cartography
– Map to determine cholera outbreak in
London.
Design with Nature (1969)
Ian McHarg – Map overlays
Terrain analysis
Cartography
1819 – Pierre Charles Dupin – Created
Choropleth Map
Intergraph Corporation
Jim Meadlock – M&S computing
112. The evolution of theories and
techniques
Longley (2001) described the period
from 1980 to 2000 as the era of
commercialization in the field of GIS.
In this period, establishment of
GIS industries,
Research centers,
GPS
OpenGIS consortium
Internet GIS
113. Importance of GIS
GIS informs not only about the activities
and the events but also where they exist.
The solutions to problems often require
access to several types of information
that can only be linked by geography.
GIS allows to store and manipulate
information using geography and to
analyze patterns, relationships, and
trends in that information to help in
making better decisions