Changes between Version 94 and Version 95 of WKTRasterTutorial01


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Timestamp:
09/28/10 08:56:43 (14 years ago)
Author:
pracine
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  • WKTRasterTutorial01

    v94 v95  
    3131We will use two different datasets:
    3232
    33  * The first dataset is a point shapefile of 814 caribou observations done by airplane in the northern part of the province of Quebec by the provincial ministry of natural ressources between 1999 and 2005. We do not provide you this file. We will show later in the tutorial how you can easily produce a similar random point cover.
     33 * The first dataset is a point shapefile of 814 caribou observations done by airplane in the northern part of the province of Quebec by the provincial ministry of natural ressources between 1999 and 2005. We do not provide this file. We will show later in the tutorial how you can easily produce a similar random point cover. You can also use your set of point.
    3434
    3535 * The second dataset is a series of 13 SRTM elevation rasters covering most of the province of Quebec. These free rasters, available on the web, are 6000x6000 pixels each, have a pixel size of about 60 x 90 meters and weight a total of 900 MB once unzipped. There are many versions of SRTM. We choose the one at ftp://srtm.csi.cgiar.org/SRTM_v41/SRTM_Data_GeoTIFF/ . You do not have to download the same files we used. Just download ten of them in the area of your choice. You can find a pretty good description of this dataset in Wikipedia (http://en.wikipedia.org/wiki/SRTM).
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    3838
    3939== Loading the caribou points shapefile into PostGIS ==
     40
     41We describe these steps for those who want to use their own point dataset and who do not know PostGIS. If you don't have your own dataset, you can jump directly to the next section.
    4042
    4143This operation is very straightforward for any casual PostGIS user. There are many ways to import a shapefile into PostGIS. You can use the classical loader provided with PostGIS (shp2pgsql.exe) or the GUI one integrated into pgAdmin III. You can also use GDAL/OGR, OpenJUMP or QGIS. The classical PostGIS loader and GDAL/ORG are command line programs and PostGIS GUI, OpenJUMP and QGIS are graphical user interfaces (GUI). PostGIS WKT Raster does not have a GUI loader yet. It comes with a Python command line loader (gdal2wktraster.py, thanks to Mateusz Loskot) very similar to PostGIS shp2pgsql.exe. We will import both datasets using those loaders in order to appreciate the similitudes.