1. Creating a simple buffer function comparison model

The aim of this simple model was to check if two different functions perform the buffering operation in the same way. I have chosen the GRASS and QGIS geoalgorithms packages for this comparison. The data was sample_rivers polyline layer from the Polish State Forests Numerical Map.

a) The first step was to define input – in this case, it could be any vector layer.

There are a number of good reasons to store your data in a real Database instead of using shapefiles and other file based formats. One of the most importants, and often ignored, is that the Databases do not only store your data, but also give the user a huge set of tools to allow geoprocess and analyze data.