QGIS

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QGIS

QGIS (previously known as Quantum GIS) is a free and open-source cross-platform, desktop geographic information system (GIS) application that supports viewing, editing, and analysis of geospatial data. QGIS functions as geographic information system (GIS) software, allowing users to analyse and edit spatial information, in addition to composing and exporting graphical maps. QGIS supports both raster and vector layers; vector data is stored as point, line, or polygon features. Multiple formats of raster images are supported and the software can georeference images. QGIS integrates with other open-source GIS packages, including PostGIS, GRASS GIS, and MapServer. Plugins written in Python or C++ extend QGIS's capabilities. Plugins can geocode using the Google Geocoding API, perform geoprocessing functions, which are similar to the standard tools found in ArcGIS, and interface with PostgreSQL/PostGIS, SpatiaLite and MySQL databases.

The Spoken Tutorial Effort for QGIS has being contributed by Dr. Snehalatha Kaliappan from IIT-Bombay and Prajwal.M from NIT Suratkal.

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Contents


Basic Level

1. Installation of QGIS

  • System requirements to install QGIS
  • Add QGIS repositories on Ubuntu Linux OS
  • Installation of QGIS on Ubuntu Linux OS
  • Visit the Official QGIS Website
  • Download QGIS installer for Windows 10
  • Installation of QGIS on Windows 10
  • Download QGIS installer for Mac OS X
  • Installation of QGIS on Mac OS X
  • Open and show QGIS interface

2. Downloading GIS Datasets

  • Basic introduction to GIS
  • Download open source vector datasets from Natural Earth Data website
  • About geospatial data
  • About vector data
  • View vector data in QGIS
  • Save the map in .qgs format
  • Download raster dataset from Bhuvan website
  • About raster data
  • View raster data in QGIS

3. Coordinate Reference Systems

  • Add layers to the projections in QGIS
  • Change the color of the layer
  • Resize the panels on the canvas
  • View metadata information for layers in QGIS
  • Save selected features from a layer to a new layer
  • Re-project and overlay data layers of different projections together
  • Delete a layer from the dataset


4. Digiiizing Map Data

  • Create Point and Polygon shape files
  • Digitize Point and Polygon shape files
  • About Toggle editing and Add Feature tools
  • Open attribute table for Point feature
  • Open attribute table for Polygon feature
  • Change style and color for Point and Polygon features


5. Importing Spreadsheets

  • Import speadsheets in CSV format to create a Point layer
  • Convert Point layer to a Polyline layer
  • About QGIS Geoalgorithm
  • About WMS layers
  • Select a WMS map from Bhuvan website
  • Load WMS (Web Map Service) layers in QGIS


6. Vector Data Styling

  • Load vector data in QGIS
  • Open attribute table for the layer
  • Learn to style vector layers using,

Single symbol styling Categorized styling Graduated styling

  • Show how to Label features

7. Geometric Properties of Vectors

  • Show attribute table for a shapefile layer
  • Show selected features from attribute table on the map
  • Change the CRS of the layer
  • Add columns to the attribute table
  • Calculate statistics for the attributes using Field Calculator tool

8. Raster Data Styling

  • Information about download and save example files from the Code files link
  • Change Coordinate Reference System for the given layer
  • Use Identify Features tool to view the pixel value
  • Change the style of the raster map
  • About raster properties
  • View metadata information
  • Write an expression in the raster calculator

Contributors and Content Editors

Snehalathak