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GIS Tutorials for Beginner, Intermediate, and Advanced GIS Users -
Georeferencing Satellite Imagery from Google Earth using QGIS
( 11 Votes )
Wednesday, 21 September 2011 22:39
google_earth_satellite_image  This tutorial was suggested by one of our users.  

This intermediate level QGIS tutorial explains how you can obtain satellite imagery from Google Earth, export it and georeference the image.  Users will also learn how to use QGIS Gdaltools [ … ]

How to Create a Shapefile from XY Data using QGIS
( 30 Votes )
Tuesday, 19 July 2011 00:00
QGIS Create Shapefile From Coordinates

This tutorial will teach the user how to use a delimited text file containing X,Y coordinate data and turn it into a shapefile for use with GIS software. A delimited text file is an attribute table with each column separated by a defined [ … ]

PostGIS: Buffer lat/long and other projections using meters units, custom st_buffer_meters function
( 13 Votes )
Monday, 04 July 2011 23:42

This advanced PostgreSQL/PostGIS tutorial will provide users with a set of two plpgsql functions: utmzone(geometry) and st_buffer_meters(geometry, double precision).  These functions will be helpful for anyone trying to buffer latitude/longitude data using meters or kilometers.  These functions have been designed to work with any projection, allowing users to buffer geometry objects using distances specified in meters for all areas of the globe.

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