This intermediate Quantum GIS (QGIS) tutorial will illustrate the 4 types of raster based terrain analysis techniques: slope, aspect, ruggedness index and total curvature. This tutorial will also demonstrate how to produce a shaded [ … ]
This is an advanced OpenLayers tutorial which explains how to setup your own WFS-T example using a combination of GeoServer and PostgreSQL/PostGIS. In order to complete this tutorial, a user must have administrative access to both GeoServer and PostgreSQL running on a server. Users must also have an intermediate understanding of programming OpenLayers for developing web mapping applications. I also recommend users to install an add-on to Mozilla Firefox called Firebug, as it can be very useful when debugging the XML Posts and Responses sent by GeoServer during the WFS-T calls.
A GIS Buffer is a proximity analysis used to create polygons based on a specified distance from the original geometrical feature. The output is a larger zone or region that surrounds and encompasses the feature.