The input data in this project, as said beofre, is a GIS database format. That means geographical information in raster and vector files. As written in the title of this post, the area in which this project focus is the city of Rome, specifically centered on the Tevere river. Here is a list of the provided files:
- DemTevere20m.dem ...(USGS Digital Elevation Model file). Format specification is found on this link: http://nationalmap.gov/standards/pdf/2DEM0198.PDF
- DemTevere20m.tif ...(public domain GeoTIFF format). A full description is found here: http://www.gisdevelopment.net/technology/ip/mi03117pf.htm
- colormap.tif ...(Aldus-Adobe TIFF). The specification is here: http://partners.adobe.com/public/developer/tiff/index.html
- f_tevere.shp ...(ESRI shapefile). The ESRI shapefile technical description can be found here: http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf
- ReportAssegnazioneUsoSuoli.odt ...(OpenDocument Text document). Title: "Report, allocation of land use".
The two DemTevere20m files are obviously digital elevation models, and both will provide the heightmaps of the terrain; while the rest of files will be used to texture that terrain. colormap.tif is a raster with info about ecosystems in such area. All the vegetaion existing in the area is classified in several main groups in order to be represented easier, each one of these group is called ecosystem. The coordinate reference system is EPSG:32633. Datum=WGS84; Projection=UTM Zone 33.
The first step in the project is the data preparation; this is to explore and check the input data, and for such purpose QGIS was used. Then, those raster and vector files were loaded into the software.The first thing noticed was that the vector shp of the river was displaced entirely about 2 meters, so the error was corrected. Aswell, since the landscape will be based in the terrain defined by the DEM limits, the data which overlays out of the area it's not necessary. Clipping operations were made in all raster and vector files in order to clean up the data. One could find anoother error, this concerning the reference system of one of the raster layer. Altough the projection was correctly displayed by the QGIS viewer, the metadata was wrong (UTM Zone 32), and this could lead to a future error when introducing the data in GDAL library.