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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<br>
<br>
<div class="moz-cite-prefix">On 18.11.2015 09:32, Bar Ori wrote:<br>
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<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 style="color:blue">new</span>[]<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">{<o:p></o:p></span></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 style="color:blue">null</span>, <span
style="color:#A31515">"1"</span>),<o:p></o:p></span></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 style="color:blue">null</span>, <span
style="color:#A31515">"2"</span>),<o:p></o:p></span></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 style="color:blue">null</span>, <span
style="color:#A31515">"3"</span>),<o:p></o:p></span></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 style="color:blue">null</span>, <span
style="color:#A31515">"4"</span>)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">};<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">And when I am
doing as follows:<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></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 style="color:blue">new</span> <span
style="color:blue">double</span>[6];<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">Gdal.GCPsToGeoTransform(gcps,
geotransform, 0)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">Or (after using
dataSet.SetGCPs(gcps, projection) :<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></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 style="color:blue">new</span> <span
style="color:blue">double</span>[6];<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">dataSet.GetGeoTransform(geotransform);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">So the values
returned, are wrong.<o:p></o:p></span></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.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">The same with
all the geotransform values.<o:p></o:p></span></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.<o:p></o:p></span></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”?<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas">Thanks.<o:p></o:p></span></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
style="font-size:10.0pt;font-family:DaxOT-Regular;color:#1F497D">Ori
Bar |</span></b><span dir="RTL"></span><span
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Systems Land and C4I<o:p></o:p></span></p>
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</span></b><b><span
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