I have a thousand raster tiles in un-projected decimal degrees from which to build a seamless mosaic in a metres-based coordinate system. The final image will be about 70,000px by 50,000px. Which is the better approach, thinking in terms of processing (time) efficiency and quality of result:
- mosaic into a single image and then transform to the final projection?
- or transform each tile and then mosaic?
- (or don't mosaic at all and use a virtual raster table in the final projection?)
I can use either or any of ArcGIS Desktop, GDAL Utilities, QGIS and a have 64bit OS with 12GB RAM.