Steve,<br><br>Yes you can supply multiple input files to mosaic into a single output file.<br>You can get the -co options for your output format by going to:<br><a href="http://www.gdal.org/formats_list.html">http://www.gdal.org/formats_list.html
</a> and finding your output format<br>or <br><dl><dt><b>--format</b> <em>format</em></dt><dd>List detailed information about a single format driver. The <em>format</em> should be the short name reported in the <b>--formats
</b> list, such as GTiff.</dd></dl><br>-wo is at:<br><a href="http://www.gdal.org/structGDALWarpOptions.html#0ed77f9917bb96c7a9aabd73d4d06e08">http://www.gdal.org/structGDALWarpOptions.html#0ed77f9917bb96c7a9aabd73d4d06e08
</a><br><br>John<br><br><div><span class="gmail_quote">On 4/5/07, <b class="gmail_sendername">Stephen Woodbridge</b> <<a href="mailto:woodbri@swoodbridge.com">woodbri@swoodbridge.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi John, et al,<br><br>You example a) implies that you can supply multiple input files to<br>mosaic into a single output file. Can you do that in one command? So<br>multiple files names are on the command line and the last one is the
<br>output file? That would be very sweet.<br><br>Also do you know where the various options for -wo and -co are listed.<br>They are not in the man pages. There is only the less than useful<br>comment "There is a list of available ones. " and not reference as to where.
<br><br>-Steve<br><br>John Mitchell wrote:<br>> Hi,<br>><br>><br>> Within gdalwarp where does using the higher quality option of -rc(cubic<br>> resampling) verses the default of nearest neighbour resampling have the
<br>> greatest impact as far as quality and also as far as speed.<br>> Either<br>> a.) running gdalwarp to mosaic a number of tiles together and at the<br>> same time reproject<br>><br>> i.e. gdalwarp.exe
-wo SKIP_NOSOURCE=YES -s_srs EPSG:" + EPSG + "<br>> -t_srs EPSG:" + EPSG_wgs84 + " -rc -co tiled=yes -q " + inputFiles + " "<br>> + rasterFile<br>><br>> b.) running gdalwarp to reduce the resolution but not changing the
<br>> projection and not mosaicking<br>> i.e. gdalwarp.exe -tr " + psx + " " + psy + " -s_srs EPSG:" +<br>> EPSG_wgs84 + " -t_srs EPSG:" + EPSG_wgs84 + " -rc -co tiled=yes -q " +
<br>> rasterFile + " " + warpedSplitRasterFile<br>><br>><br>> Will it be faster to reduce resolution against a file via gdalwarp that<br>> has already been reduced and will the quality be the same? As an example:
<br>> 1.) I mosaic a number of tiles at full resolution<br>> 2.) I reduce the mosaic from 1 by 1/2<br>> 3a.) I reduce the mosaic from 1 by 1/4<br>> 3b.) I reduce the mosaic from 2 by 1/2<br>><br>> Between 3a and 3b will 3b be faster and will the quality be the same?
<br>><br>> Any other suggestions on speeding up gdalwarp would be appreciated.<br>><br>> Thanks,<br>><br>><br>> --<br>> John J. Mitchell<br>><br>><br>> ------------------------------------------------------------------------
<br>><br>> _______________________________________________<br>> Gdal-dev mailing list<br>> <a href="mailto:Gdal-dev@lists.maptools.org">Gdal-dev@lists.maptools.org</a><br>> <a href="http://lists.maptools.org/mailman/listinfo/gdal-dev">
http://lists.maptools.org/mailman/listinfo/gdal-dev</a><br><br></blockquote></div><br><br clear="all"><br>-- <br>John J. Mitchell