Raster: mosaic first, or project first?

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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 finalprojection?
  • or transform each tile and then mosaic?
  • (or don't mosaic at all and use a virtual raster table in thefinal projection?)
I can use either or any of ArcGIS Desktop, GDAL Utilities, QGIS and a have 64bit OS with 12GB RAM.



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