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<div class="moz-cite-prefix">On 18.11.2015 11:59, Bar Ori wrote:<br>
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<p class="MsoNormal"><span style="color:#1F497D">Thanks Ari for
your reply.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">In my
situation, sometimes I am working with rectangles and
sometimes not. Depends the source of information.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="color:#1F497D">I thought to always use the GCPs as
follows:<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="color:#1F497D">In case my shape has rectangular form,
so the dataSet.GetGCPCount() will return me “0” and I will
use the dataSet.GetGeoTransform(), otherwise, will use the
dataSet.GetGCPs().<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="color:#1F497D">The issue is that for setting the
GCPs, I must put the coordinate in the middle of pixel (that
is why I subtract “0.5”). If I wouldn’t, so yes, the
geotransform values would be correct.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="color:#1F497D">Is it a bad practice? Should I figure
out the shape from start and to take two different steps?</span></p>
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</blockquote>
<br>
I don't know the best answer to that. I'm just assuming if you do it
with some GUI tool for example it will report you pixel coordinates
in integer values.<br>
<br>
Ari<br>
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<p class="MsoNormal" style="text-autospace:none"><span
style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
gdal-dev [<a class="moz-txt-link-freetext" href="mailto:gdal-dev-bounces@lists.osgeo.org">mailto:gdal-dev-bounces@lists.osgeo.org</a>]
<b>On Behalf Of </b>Ari Jolma<br>
<b>Sent:</b> 18 November 2015 11:35<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:gdal-dev@lists.osgeo.org">gdal-dev@lists.osgeo.org</a><br>
<b>Subject:</b> Re: [gdal-dev] GCPsToGeoTransform
returns wrong values<o:p></o:p></span></p>
</div>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Bar,<br>
<br>
I think you are setting the GCPs up wrongly if you want them
to be at the corners.<br>
<br>
GCP(LeftDown.X, LeftDown.Y, LeftDown.Z, Height - 0.5, null,
"4") does not have 0 before Height-0.5.<br>
<br>
GCPsToGeoTransform checks the special case of GCPs in
rectangular shape and in top-left, top-right, bottom-right,
bottom-left order and returns the exact transform the dataset
has.<br>
<br>
I'm not sure if it makes sense to have real values for the
pixel coordinates although they are real values.<br>
<br>
Best,<br>
<br>
Ari<o:p></o:p></p>
<div>
<p class="MsoNormal">On 18.11.2015 09:32, Bar Ori wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal">I noticed something that for me looks
weird and I would like to know maybe I am doing something
wrong.<o:p></o:p></p>
<p class="MsoNormal">If not, how should I overcome this
behavior.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I set 4 GCPs as follows:<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:blue">var</span><span
style="font-size:9.5pt;font-family:Consolas"> gcps =
</span><span
style="font-size:9.5pt;font-family:Consolas;color:blue">new</span><span
style="font-size:9.5pt;font-family:Consolas">[]</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">{</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:blue">new</span><span
style="font-size:9.5pt;font-family:Consolas">
GCP(LeftUp.X, LeftUp.Y, LeftUp.Z, 0.5, 0.5,
</span><span
style="font-size:9.5pt;font-family:Consolas;color:blue">null</span><span
style="font-size:9.5pt;font-family:Consolas">,
</span><span
style="font-size:9.5pt;font-family:Consolas;color:#A31515">"1"</span><span
style="font-size:9.5pt;font-family:Consolas">),</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:blue">new</span><span
style="font-size:9.5pt;font-family:Consolas">
GCP(RightUp.X, RightUp.Y, RightUp.Z, Width - 0.5, 0.5,
</span><span
style="font-size:9.5pt;font-family:Consolas;color:blue">null</span><span
style="font-size:9.5pt;font-family:Consolas">,
</span><span
style="font-size:9.5pt;font-family:Consolas;color:#A31515">"2"</span><span
style="font-size:9.5pt;font-family:Consolas">),</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:blue">new</span><span
style="font-size:9.5pt;font-family:Consolas">
GCP(RightDown.X, RightDown.Y, RightDown.Z, Width - 0.5,
Height - 0.5,
</span><span
style="font-size:9.5pt;font-family:Consolas;color:blue">null</span><span
style="font-size:9.5pt;font-family:Consolas">,
</span><span
style="font-size:9.5pt;font-family:Consolas;color:#A31515">"3"</span><span
style="font-size:9.5pt;font-family:Consolas">),</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:blue">new</span><span
style="font-size:9.5pt;font-family:Consolas">
GCP(LeftDown.X, LeftDown.Y, LeftDown.Z, Height - 0.5,
</span><span
style="font-size:9.5pt;font-family:Consolas;color:blue">null</span><span
style="font-size:9.5pt;font-family:Consolas">,
</span><span
style="font-size:9.5pt;font-family:Consolas;color:#A31515">"4"</span><span
style="font-size:9.5pt;font-family:Consolas">)</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">};</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">And when I am
doing as follows:</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:blue">var</span><span
style="font-size:9.5pt;font-family:Consolas"> geotransform
=
</span><span
style="font-size:9.5pt;font-family:Consolas;color:blue">new</span><span
style="font-size:9.5pt;font-family:Consolas">
</span><span
style="font-size:9.5pt;font-family:Consolas;color:blue">double</span><span
style="font-size:9.5pt;font-family:Consolas">[6];</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">Gdal.GCPsToGeoTransform(gcps,
geotransform, 0)</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">Or (after
using dataSet.SetGCPs(gcps, projection) :</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:blue">var</span><span
style="font-size:9.5pt;font-family:Consolas"> geotransform
=
</span><span
style="font-size:9.5pt;font-family:Consolas;color:blue">new</span><span
style="font-size:9.5pt;font-family:Consolas">
</span><span
style="font-size:9.5pt;font-family:Consolas;color:blue">double</span><span
style="font-size:9.5pt;font-family:Consolas">[6];</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">dataSet.GetGeoTransform(geotransform);</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">So the values
returned, are wrong.</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">For example,
if the LeftUp.X was 35.01050 so the value of
geotransform[0], which supposed to be the same value, can
be 35.0082.</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">The same with
all the geotransform values.</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">If I am
getting from the dataset and setting again, every time it
is changing more and more.</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">Is there any
connection to the use of the “0.5”?</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">Thanks.</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><b><span
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<p class="MsoNormal"><b><span
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Systems Land and C4I</span><o:p></o:p></p>
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