3. Reprojecting GIS data
3.1. Reproject raster data
GDAL
has the capability to change a raster coordinate system using the following
syntax:
gdalwarp
-t_srs EPSG:... <input> <output>
The -t_srs
argument specifies the
target coordinate system. If the source coordinate system is unknown it must be
specified with the -s_srs
argument. EPSG:...
specifies the EPSG code of the projection. <input>
and <output>
are the input and output data respectively.
We are
now going to reproject a Digital Elevation Model (DEM) acquired by the Shuttle
Radar Topography Mission (SRTM). You can use this website to download DEM's for
your area of interest: http://srtm.csi.cgiar.org/index.asp
In order to reproject
the DEM from WGS-84 lat/lon to Amersfoort/RD New we use this command:
gdalwarp -t_srs EPSG:XXXXX srtm_37_02.tif dem_rd.tif
1.
Replace XXXXX
with the proper EPSG code for Amersfoort/RD New
(see one of your previous answers using ogrinfo).2. Execute the command:
gdalwarp -t_srs EPSG:28992 srtm_37_02.tif dem_rd.tif <ENTER>

3. Visualize the result in QGIS.
More info on the gdalwarp command can be found here.