I want to generate tiles in custom size but can't find a tiler that can do it.
In gdal2tiles I cant find the size option.
TileMapper costs too much.
Is there any opensource utils that can generate tiles in custom sizes?
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You can use the gdal_retile.py tool with the option
mkdir image_tiles gdal_retile.py -v -r bilinear -levels 1 -ps 512 512 -co "TILED=YES" -targetDir image_tiles big_input_image.tif
For more Information see: http://www.gdal.org/gdal_retile.html
Your can find futher solutions for QGIS, ArcGIS and gdal_translate under the following link: How to split a .tif image into several tiles?