QGIS Introductory PresentationPrepared By:Niloy GhoshNitin Kumar RathoreStudents of 2nd Year MBA at Vinod Gupta School of Management(VGSOM), IIT Kharagpur
What is QGIS?• Quantum Geographical Information Systems (GIS) is an Open Source Geographic Information System software• It is a system designed to capture, store, manipulate, analyze, manage, and present all types of geographically referenced data• The QGIS desktop offers many functions for viewing, editing, and analysis of data.• Data can be exported to Mapfiles to be viewed as webpages without using QGIS
About GIS• GIS allows us to view, understand, question, interpret, and visualize data in many ways that reveal relationships, patterns, and trends in the form of maps, globes, reports, and charts.• It can be used to map and monitor data as well as changes in it over a period so as to take appropriate action• We would be using the QGIS version 1.7.3 called Wroclaw
Data• The data for the QGIS consists of 2 forms – Raster: a regular grid made up of cells, or in the case of imagery, pixels having a fixed number of rows and columns. Each cell has a numeric value and has a certain geographic size. – Vector: describing a location by using a set of coordinates. Each coordinate refers to a geographic location using a system of x and y values.• For our demo purpose we would be using “shapefiles” which are a digital vector storage format for storing geometric location and associated attribute information.• It is a collection of files which need to be stored in the same location. The 3 mandatory one are: – .shp — shape format – .shx — shape index format – .dbf — attribute format• The other data that would be mapped can be obtained as tab-delimited files or .csv files from various sources.
Installing PluginsGo to: Plugins Fetch Python Plugins
Under the Repositories Tab, Click on Add 3rd party repositories button
In case the Plugins are Unavailable, check the Network settings•Go to Settings Options
•Under the Network Tab, enter your Host, Port and Proxy type•Click OK
•Go back to the Plugin Installer and add the 3rd Party Repositories•Under the Plugins Tab search for the required plugin and Click the Install plugin button
A step-by-step procedure for styling Vector data in QGIS
Getting the data• Shapefile – The shapefile can be obtained from the site http://www.naturalearthdata.com/ – Download the ‘ne_10m_admin_0_countries’ shapefile• Data – The earthquake related data can be downloaded from the website http://www.ngdc.noaa.gov/nndc/struts/form?t=1016 50&s=1&d=1 in a tab-delimited text file format.
Formatting the earthquake data for our purposeOpen a New Project