<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi<div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 01 Sep 2016, at 3:55 PM, Zoltan Szecsei <<a href="mailto:zoltans@geograph.co.za" class="">zoltans@geograph.co.za</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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Hi Guys,<br class="">
I've been struggling to get some 3200 orthos mosaicked and tiled.<br class="">
They are very old and have really bad projection definitions, pixel
sizes and metadata funnies.<br class="">
I'm down to the last 261, and have hit a brick wall, likely due to
my not that great "projection definitions" knowledge.<br class="">
<br class="">
I get the following error from gdalwarp:<br class="">
<br class="">
<blockquote class="">ERROR 6: Unable to load PROJ.4 library (libproj.so),
creation of<br class="">
OGRCoordinateTransformation failed.<br class="">
</blockquote>
I have tried various different gdalwarp parameters - even leaving
gdalwarp to sense in input projection and me only specifying the
output projection.<br class="">
If I leave out both s_srs and t_srs then gdalwarp does work but
obliviously does not reproject to Lo19. <br class="">
I have even tried feeding the output of this redundant gdalwarp into
a gdalwarp with t_srs, but no success.<br class="">
<br class="">
Specifying only t_srs (as above) on many other orthos on Lo17 &
Lo21 does work so it is likely that the way this projection is
embedded in this ortho is the problem.<br class="">
I have tried stripping it out with gdal_edit.py but haven't gotten
that right yet.<br class="">
<br class="">
Anyone with pointers or ideas on this?<br class=""></div></div></blockquote><div><br class=""></div><div>Have you tried using the corner coordinates and centre to georeference the image. I assume the corner & centre coordinates reported are correct and in LoXX ? There is an example of how to do this in the first reply of this stack exchange post:</div><div><br class=""></div><div><a href="http://gis.stackexchange.com/questions/38987/how-can-i-add-all-the-4-corners-as-gcp-in-an-image-that-i-want-to-reproject" class="">http://gis.stackexchange.com/questions/38987/how-can-i-add-all-the-4-corners-as-gcp-in-an-image-that-i-want-to-reproject</a></div><div><br class=""></div><div>Hope that helps!</div><div><br class=""></div><div>Regards</div><div><br class=""></div><div>Tim</div></div><br class=""><div class="">
<div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-position: normal; font-variant-caps: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; text-align: center;" class=""><span>—</span></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-position: normal; font-variant-caps: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; letter-spacing: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; text-align: center;" class=""><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: center; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: initial; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; margin: 0px; line-height: normal; -webkit-text-stroke-color: rgb(0, 0, 0); min-height: 14px;" class=""><br class=""></div><br class="Apple-interchange-newline" style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: center; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><span style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: center; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><span><span><span><span><img height="118" width="150" apple-inline="yes" id="511D616E-C542-4E91-81C3-347627695154" apple-width="yes" apple-height="yes" src="cid:1A5DF6DE-E302-4C28-BFBD-29663CBF1351" class=""></span><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: center; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: initial; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; margin: 0px; line-height: normal; -webkit-text-stroke-color: rgb(0, 0, 0); min-height: 14px;" class=""><br class="Apple-interchange-newline"><br class="Apple-interchange-newline"><br class="Apple-interchange-newline"><br class="Apple-interchange-newline"><br class=""></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: center; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: initial; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; margin: 0px; line-height: normal; -webkit-text-stroke-color: rgb(0, 0, 0); min-height: 14px;" class=""><br class=""></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: center; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: initial; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; margin: 0px; line-height: normal; -webkit-text-stroke-color: rgb(0, 0, 0);" class=""><b class="">Tim Sutton</b></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: center; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: initial; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; margin: 0px; line-height: normal; -webkit-text-stroke-color: rgb(0, 0, 0); min-height: 14px;" class=""><br class=""></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: center; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: initial; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; margin: 0px; line-height: normal; -webkit-text-stroke-color: rgb(0, 0, 0);" class=""><b class="">Co-founder:</b><span class="Apple-converted-space"> </span>Kartoza</div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: center; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: initial; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; margin: 0px; line-height: normal; -webkit-text-stroke-color: rgb(0, 0, 0);" class=""><b class="">Project chair:</b><span style="font-weight: normal;" class=""><span class="Apple-converted-space"> </span><a href="http://qgis.org" class="">QGIS.org</a></span></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: center; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: initial; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; margin: 0px; line-height: normal; -webkit-text-stroke-color: rgb(0, 0, 0); min-height: 14px;" class=""><br class=""></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: center; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: initial; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; margin: 0px; line-height: normal; -webkit-text-stroke-color: rgb(0, 0, 0);" class="">Visit <a href="http://kartoza.com/" class=""><span style="-webkit-text-stroke-color: rgb(71, 135, 255);" class="">http://kartoza.com</span></a> to find out about open source:</div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; 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word-spacing: 0px; -webkit-text-stroke-width: initial; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; margin: 0px; line-height: normal; -webkit-text-stroke-color: rgb(0, 0, 0); min-height: 14px;" class=""><br class=""></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: center; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: initial; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; margin: 0px; line-height: normal; -webkit-text-stroke-color: rgb(0, 0, 0);" class=""><b class="">Skype</b>: timlinux </div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: center; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: initial; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; margin: 0px; line-height: normal; -webkit-text-stroke-color: rgb(0, 0, 0);" class=""><b class="">IRC:</b><span class="Apple-converted-space"> </span>timlinux on #qgis at <a href="http://freenode.net" class="">freenode.net</a></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: center; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: initial; font-variant-ligatures: normal; 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