Hi,<br><br>I have found in comparing the speed between gdal_merge and gdalwarp that gdal_merge mosaics tiles together more than twice as fast. If all I need to do is mosaic tiles together that are the same resolution and keeping the same projection, then what advantage is using gdalwarp? Also I noticed what I think is a new utility on the gdal utilities page called "
<a class="el" href="http://www.gdal.org/nearblack.html">nearblack</a> - Convert nearly black/white borders to exact value."<br><br>Thanks, <br clear="all"><br>-- <br>John J. Mitchell