ARC VIEW GEOGRAPHICAL INFORMATION SYSTEM (GIS)Presentation Transcript
ARC VIEW GEOGRAPHICAL INFORMATION SYSTEM(GIS) HUSSAIN MAJID
Arc View GIS gives us power to visualize, explore, query and analyse data geographically. In this system we deal with data in a new way.
Maps are being used for thousand of years to analyse geographical information. In Arc View we can use existing available data to create hundreds of different maps. Once a map is made, it is easy to add tabular data i.e. dBase files. In fact Arc View lets you create maps to show off your data.
Creating Maps with Arc View
Maps in Arc View are based on spatial data. Spatial data is a data containing the geographic location of feature on earth’s surface, alongwith attribute information describing what these feature represent. To create a new map we follow the steps
Start Arc View
In project window click new button to create a new view.
Click the add theme button to add spatial data to map form the directory containing spatial data.
Scale of Field and Map Units
Scale of field and map units are adjustable as we require. To do so we just click the view menu and choose properties as we require.
Measurement of the Distance between two Places on Map
Measuring tool is used to measure the Arial distance between two places. The result is given in the distance units we select.
Theme’s Display Property
If we require that map should be displayed in certain range of scale, this can set by theme display properties button. This can be done just clicking the theme properties button and entering the desired range.
Addition of Data to Maps
Image data- Satellite images and Arial photographs
Computer Aided Design- CAD drawings with the use of CAD reader extension
Tabular Data- Tabular data in dBase using SQL connection feature, connect to dBase server i.e. Oracle.
Adding Tabular Data About Features to Map
Type data straight in to Arc View
Load tabular data from files
Load tabular data from data bases using SQL connection
Loading Existing Data to Arc View
If our data is already in a computer as a file or in dBase. We load data in Arc View and then we can add the data to a map by joining it to the attribute table to an appropriate theme.To do so we choose add table from project menue.
Loading Tabular Data From Data Bases
Using Arc View’s SQL connection feature we can connect to a data base server such as Oracle and run SQL query to retrieve record from it. The record you access become table in your project.
Creating New Table in Arc View
It is another way to get your data in Arc View. We can create a new empty table and type in all the values. We can then join or link it to a theme attribute table. Creating a new table is a good way to get into Arc View because our data is more flexible as compare to data in a separate table.
Adding Street Addresses and Other Locations to a Map
If our data contains geographical location of a place then we can add this location to the map. These locations may be in the following forms:
X, Y coordinates i.e. files containing the longitude and latitude.
Measurement along the route feature.
Once data is added to map, then we can symbolize, Query and analyse the data.
Symbolizing the Data
When we display our data on map we can show it using different distributions, relationships and trends. This helps us to communicate our information and results more effectively. We can show our maps using:
Unique value map
Graduated colour map
Graduated symbol map
Labelling Maps With Text And Graphics
We can label a theme’s feature with information from any of the fields in the theme’s attribute table.
We can add additional information by typing text directly on to map.
We can draw graphics using drawing tools such as circles, boxes and lines on the top of the map to draw attention to a particular feature.
Setting up and Using Hot Links
This is another way to provide additional information on a view by setting up hot links between features and external files. In this way we can display the file specified by hot links for the particular features. Information such as buildings, plans, photographs, documents and video clips etc.
Charts can represents complex tabular information because it is an attractive and easy way to understand data. These can show additional information or same information in different way. Charts can be dynamically linked to maps and tables In Arc View.
Drawing a New Map with Arc View
Editing function of Arc View can be used to draw a new map in a view. Digitizing tablet can be used instead of mouse to create spatial data from the features on any paper map. A new map may consist of following themes.
Creating New Point Theme
Arc View Point theme are used to represent locations such as cities, Hotels , Educational institutions, Hospitals and shops etc. We can add new points to a view using Arc View’s editing function. Once we add a point to a view, tabular data describing these points can then be added.
Creating a New Line Theme
If we want to add a narrow features to a view such as roads, streams, pipelines, we can create a Arc View’s line theme. When a line is added to a theme, we can add information to the theme attribute table regarding line i.e. Length, location and type etc.
Creating a New Polygon Theme
Polygon feature are drawn in Arc View to represent homogenous areas such as states, Parcels, land use zone or forests stands etc. When anew polygon is added
to a theme Arc View adds record to the Theme’s attribute table. We can add new fields to the table to store additional information regarding polygon.
Working with Images
Images are useful source of information. The images may be scanned maps or photographs. We can add aerial photographs to a view to provide a realistic
background to other view. We can add satellite images to review minute information i.e. about topography and geology of land, about weather condition or flood levels etc.
Laying Out and Printing Maps
Arc View can be used to create different layouts. We can assemble and arrange all the components, which we want to add to a lay out. Layout makes it easy to produce presentable maps. We can place more than one view onto a layout alongwith any Chart or table. The layout created is printable.
Application of Arc View in DOS Projects
Storing information about PAEC establishments i.e.
Inventory of sealed radiation sources
Waste management data base
Data regarding the handling of radiation victims at various PAEC medical centers
Chalking out emergency plan in case of accidental releases