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<body class='hmmessage'><div dir='ltr'>The other problem with that documentation is the return code. CE_Failue means that the driver does not support it and/or that the dataset doesn't have it. <br><br><hr>From: tkeitt@utexas.edu<br>Date: Mon, 9 Dec 2013 10:55:34 -0600<br>To: jukka.rahkonen@mmmtike.fi<br>CC: gdal-dev@lists.osgeo.org<br>Subject: Re: [gdal-dev] Default GeoTransform for MEM driver<br><br><div dir=ltr>Right. Thanks for checking into it.<div><br></div><div>I guess I was thrown by <a href="http://www.gdal.org/classGDALDataset.html#af9593cc241e7d140f5f3c4798a43a668" target=_blank>http://www.gdal.org/classGDALDataset.html#af9593cc241e7d140f5f3c4798a43a668</a></div>
<div><br></div><div>which gives the default as {0, 1, 0, 0, 0, +1}.</div><div><br></div><div>Is there a library wide convention on this? I can update the docs if so. (I assume its a simple pull and send a diff type setup.)</div>
<div><br></div><div>THK</div></div><div class=ecxgmail_extra><br><br><div class=ecxgmail_quote>On Sun, Dec 8, 2013 at 11:27 PM, Jukka Rahkonen <span dir=ltr><<a href="mailto:jukka.rahkonen@mmmtike.fi" target=_blank>jukka.rahkonen@mmmtike.fi</a>></span> wrote:<br>
<blockquote class=ecxgmail_quote style="border-left:1px #ccc solid;padding-left:1ex;"><div class=ecxim>Tim Keitt <tkeitt <at> <a href="http://gmail.com" target=_blank>gmail.com</a>> writes:<br>
<br>
><br>
> I notice that the "MEM" driver returns {0, 1, 0, 0, 0, -1} by default. Is<br>
this a bug or do some formats flip the vertical axis? If so, what is the<br>
convention for detecting and handling "south up" formats in code?<br>
<br>
</div>I guess that anchor point is at the top left corner and therefore the north<br>
coordinate is decreasing step by step when you walk downwards. Document<br>
<a href="http://www.gdal.org/gdal_tutorial.html" target=_blank>http://www.gdal.org/gdal_tutorial.html</a> supports my thoughts.<br>
<br>
-Jukka Rahkonen-<br>
<br>
<br>
<br>
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