Peder,<br><br>At present, we can get that functionality using t<font size="2">he GDAL Virtual Format. ( <a href="http://www.gdal.org/gdal_vrttut.html">http://www.gdal.org/gdal_vrttut.html</a> )<br>There are <span style="font-family: courier new,monospace;"><ScaleOffset></span></font><font style="font-family: arial,helvetica,sans-serif;" size="2"> and </font><font size="2"><span style="font-family: courier new,monospace;"><ScaleRatio></span> </font><font style="font-family: arial,helvetica,sans-serif;" size="2">values</font><font size="2"> </font><font style="font-family: arial,helvetica,sans-serif;" size="2">that can be specified within the <span style="font-family: courier new,monospace;"><ComplexSource</span></font><span style="font-family: courier new,monospace;">></span>.<br>
<pre class="fragment"><font style="font-family: arial,helvetica,sans-serif;" size="2"><font size="2">This .vrt file can be used as it is or translated t</font>o other formats.</font><br></pre><div class="gmail_quote">On Mon, Jan 25, 2010 at 9:34 PM, Peder Axensten <span dir="ltr"><<a href="mailto:peder@axensten.se">peder@axensten.se</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">I need a tool to add images together and I also need a tool to rescale the values of an image. So I have this idea of a tool that can add images together, where each may have its own weight. For example:<br>
gdal_muladd.py -o result_file *2.2 file1 *-1 file2 file3<br>
would multiply the values of file with 2.2 and add them with -1 times the values of file2 etc.<br>
<br>
I have something (based on gdal_merge.py) that seems to work, but still needs some work to handle no_data.<br>
<br>
Is there any interest to add this to the gdal collection of tools?<br>
<br>
Regards,<br>
<br>
Peder Axensten<br>
Research engineer<br>
<br>
Swedish University of Agricultural Sciences<br>
Forest Resource Management<br>
Remote Sensing Laboratory<br>
<br>
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</blockquote></div><br><br clear="all"><br>-- <br>Best regards,<br>Chaitanya kumar CH.<br>/tʃaɪθənjə/ /kʊmɑr/ <br>+91-9848167848<br>17.241582N 80.142635E<br>