What is the difference between qgis and grass

The use of contour lines, as shown above, is one popular method often chosen to produce topographic maps. Another way to display a 3-D effect is by hillshading. Thus, you get sun-facing slopes lighted; the slopes facing away from the sun in shadow are darkened. You should now have the gtopo30 elevation with its colormap and transparency setting displayed above the grayscale hillshade map. As such, some modules in the Toolbox do not show all the options available, and some modules do not appear at all.

The GRASS shell or console gives the user access to those additional GRASS modules that do not appear in the Toolbox tree, and also to some additional options to the modules that are in the Toolbox with the simplest default parameters.

This example demonstrates the use of an additional option in the r. The module r. The next example shows how a GRASS module can aggregate raster data and add columns of statistics for each polygon in a vector map.

The right browser window shows some meta-information for selected raster or vector layers e. A sample XML file for generating the module v. The parser reads this definition and creates a new tab inside the Toolbox when you select the module. Outdated version of the documentation. Find the latest one here. Start QGIS. For Gisdbase , browse and select or enter the path to the newly created folder grassdata. Click [OK]. The elevation layer will be visualized.

The Alaska boundary vector layer will be overlayed on top of the gtopo30 map. You can now adapt the layer properties as described in chapter The Vector Properties Dialog e. Also load the other two vector layers, rivers and airports , and adapt their properties.

Visualize the alaska. Then click [Next]. Define the projection by clicking on the radio button Projection to enable the projection list. We are using Albers Equal Area Alaska feet projection. In Filter , insert to select the projection.

Click [Next]. Here, we simply click on the button [Set current qg extent] , to apply the extent of the loaded layer alaska. To import the raster map landcover.

The module dialog for r. When it says Succesfully finished , click [View output]. To import the vector GML file lakes. The module dialog for v. Options The Options tab provides a simplified module dialog where you can usually select a raster or vector layer visualized in the QGIS canvas and enter further module-specific parameters to run the module.

First, open the location by clicking the Open mapset button and choosing the Alaska location. Now load the gtopo30 elevation raster by clicking Add GRASS raster layer and selecting the gtopo30 raster from the demo location. Now a single click on the tool r. The gtopo30 raster should appear as the Name of input raster.

Type into the Increment between Contour levels the value Connect and share knowledge within a single location that is structured and easy to search. I was working with GIS and remote sensing in a university and professional environment some ten years ago ArcInfo etc , so I have some experience even though somewhat outdated.

However, I do not really get the difference between the two programs. GRASS is usually used for scientific purposes. So unless you want to do some sophisticated spatial analysis or routine, just stick with QGIS. I think for simple mapping purposes you should use QGIS. So since you plan to work with thematic maps, which I assume are in vector format, I would recommend also take a look at this article who points some info on topology. However, a lot of jobs with geodata up to final map is much more convenient in QGIS.

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