Hi, My colleague wants to know if it is possible to build a bigtiff image that gets overviews from different datasets. The aim is to have a one scale dependent rastes map image. Idea is quite attractive but is is possible to do?
The procedure might start from a bunch of external .ovr files bigtiff_1 -> gdaladdo -ro 2 4 #for near zoom bigtiff_2 -> gdaladdo -ro 8 16 #for far zoom bigtiff_3 -> gdaladdo -ro 32 64 #for more far zoom If overviews bigtiff_1.ovr, bigtiff_2.ovr and bigtiff_3.ovr could be combined and renamed as bigtiff_1.ovr we the result would be a bigtiff_1 image which would look like bigtiff_2 and bigtiff_3 when zoomed out. I can see problems if working with real world maps because the originals would have different pixel sizes but is it possible even in theory to construct hand made overviews? It could be a pleasure to use a single image as a background map in GDAL based GIS programs instead of playing with several scale dependent layers. -Jukka Rahkonen- _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
