<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">The simplest way to reproject a bunch of tiff files into a new projection is to use gdalwarp in a loop. Something like,<DIV><BR class="khtml-block-placeholder"></DIV><DIV><FONT class="Apple-style-span" face="Courier New">for</FONT><FONT class="Apple-style-span" face="Courier New"> i in `ls *.tif | awk 'BEGIN {FS="."} ; {print $1} '`; do</FONT></DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN><FONT class="Apple-style-span" face="Courier New">gdalwarp s_srs epsg:26910 t_srs epsg:2766 $i.tif $i_spcs-CaliforniaZone1.tif</FONT></DIV><DIV><SPAN class="Apple-style-span"><FONT class="Apple-style-span" face="Courier New">done</FONT> </SPAN></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>You'll have to play with the syntax as I don't use it very often but this example should transform all the tiff files in the local directory from epsg:26910 (NAD83 UTM10) to epsg:2766 (SPCS NAD83 California zone 1).</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Cheers,</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Mike</DIV><DIV><BR><DIV><DIV>On 3-Jul-07, at 3:11 PM, <A href="mailto:goldneaa@onid.orst.edu">goldneaa@onid.orst.edu</A> wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">If I have about 800 raster files in tiff format that are in the wrong projection.<SPAN class="Apple-converted-space"> </SPAN>Is there a way to change their coordinate systems all at once.<SPAN class="Apple-converted-space"> </SPAN>After examining r.region it seems to only want to change one raster at a time.<SPAN class="Apple-converted-space"> </SPAN>Will I have to build a command in unix, in order to change these rasters projections?</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Thanks</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Aaron</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">_______________________________________________</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">grassuser mailing list</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><A href="mailto:grassuser@grass.itc.it">grassuser@grass.itc.it</A></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><A href="http://grass.itc.it/mailman/listinfo/grassuser">http://grass.itc.it/mailman/listinfo/grassuser</A></DIV> </BLOCKQUOTE></DIV><BR></DIV></BODY></HTML>