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<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I would like to know how to use gdal to convert a Mr Sid air photo in UTM 15 to a GeoTiff in County Coordinates (feet).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">My original steps include<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Use ArcGIS to export the MrSID in UTM to a GeoTiff in County Coordinates (feet).<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>This takes care of converting the coordinate system, however at about 4GB, the file size is awfully huge.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Use gdal_translate to tile the image. This also seems to make the file size much more reasonable… about 280 MB.<o:p></o:p></p>
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<![if !supportLists]><span style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>gdal_translate -CO TILED=YES -CO PHOTOMETRIC=YCBCR -CO TFW=YES -CO COMPRESS=JPEG -CO BIGTIFF=YES LincolnFSA2013.tif, Lin13.tif<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Use gdaladdo to add internal JPEG overviews. This adds a small amount of data to the file, but it also makes it MUCH quicker.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Unfortunately, these steps are NOT working. It appears the coordinates are getting shifted from feet back to meters. I think it may be possible that gdal_translate is not reading or ignoring the .tfw file created by ESRI. Therefore
I need to either figure out how to force gdal_translate to read the ESRI world file, or I need to figure out how to figure out how to use only GDAL to create a GeoTiff in County Coordinates from a Mr Sid file in UTM.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If anyone has any tips on how I can use GDAL to convert an air photo in a Mr SID UTM file to a GeoTiff in County Coordinates let me know. In addition, I would like to also figure out how to remove the black boundary around the edge of
the air photos as well.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Sincerely,<o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt">Mark Volz</span></b><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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