Tagged Questions

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What's the difference between gdalwarp and gdal_merge for mosaicing

I wanted to merge around 20 dem tiffs each around 100MB, and I used gdalwarp (I know about virtual file option): gdalwarp $(list_of_tiffs) merged.tiff However this command took very long time, and ...
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gdalwarp instal of gdal_merge with -separate option

Is there any way to produce merged img file from two png files using gdalwarp just the same way gdap_mege with option -separate does it? I just need two, three-layered files to be merged into one, ...