<div class="gmail_quote">On Sat, Aug 15, 2009 at 10:57 PM, Hermann Peifer <span dir="ltr"><peifer@gmx.eu></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="im"><br></div>
I have the same observation while working with ASTER GDEM tiles (1x1 degree tiles, 3601x3601 pixel each). When warping/merging, say: 10 tiles into a single outfile.tif, then it takes gdalwarp around 5 seconds per tile to do the job:</blockquote>
<div><br></div><div>Does creating a tiled tiff (-co TILED=YES) make any difference? It should improve random access, which is what writing new data to image blocks is.</div><div><br></div><div>Rob :)</div></div>