Changes between Version 29 and Version 30 of WKTRasterTutorial01
- Timestamp:
- 06/11/10 09:00:05 (15 years ago)
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WKTRasterTutorial01
v29 v30 84 84 }}} 85 85 86 We downloaded 8 zipped files. If you have 7-Zip installed, you can simply select all the zip files, right-click on them and select "7-Zip->Extract files..." 7-Zip will extract each TIF file in the same folder. You can then create another folder and move them there. Each file is 6000 pixels wide by 6000 pixel high. You can quickly preview the images if you have IrfanView installed. Efficient raster/vector analysis with PostGIS WKT Raster requires the raster files to be split into tiles in the database. Fortunately gdal2wktraster.py has an option to tile the images the size we like. We will tile them into 100x100 pixels resulting in 60 * 60 * 13 = 46800 tiles. gdal2wktraster.py also accepts wildcard so we will be able to load our 8 big raster in one sole command.86 We downloaded 8 zipped files. If you have 7-Zip installed, you can simply select all the zip files, right-click on them and select "7-Zip->Extract files..." 7-Zip will extract each TIF file in the same folder. Each file is 6000 pixels wide by 6000 pixel high. You can quickly preview the images if you have !IrfanView installed. Efficient raster/vector analysis with PostGIS WKT Raster requires the raster files to be split into tiles in the database. Fortunately gdal2wktraster.py has an option to tile the images the size we like. We will tile them into 100x100 pixels resulting in 60 * 60 * 13 = 46800 tiles. gdal2wktraster.py also accepts wildcard so we will be able to load our 13 big rasters in one unique command. 87 87 88 88 To load the raster files in PostGIS WKT Raster, do something like:
