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<div class="moz-cite-prefix">Hi,<br>
<br>
QGIS has an image georeferencing module you could use. Here's
an article about this:
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<a
href="http://glaikit.org/2011/03/27/image-georeferencing-with-qgis/">http://glaikit.org/2011/03/27/image-georeferencing-with-qgis/</a><br>
<br>
You'll need to install QGIS:
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<a class="moz-txt-link-freetext" href="http://www.qgis.org/en/site/">http://www.qgis.org/en/site/</a><br>
<br>
HTH,<br>
<br>
Alexandre<br>
<br>
<br>
On 13-09-23 09:34 AM, Matteo Galletti wrote:<br>
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<p class="MsoNormal"><span lang="EN-US">I have a flat 400x400
pixels image which represents an area of 400x400 kilometers.
I need to draw this image as an overlay on my OpenLayers
mapping system. I use OpenStreetMap/Google Maps as base
layers. I want to draw the overlay image using an Image
Layer and I want to center my overlay image at a specific
lat/lon point. The projection of the base layer is
EPSG:900913 which is, in fact, the projection used by
OpenStreetMap and Google Maps.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">What I have understood
(please correct me if I'm wrong), is that I can't use a
flat, 'unprojected' image as an Image Layer, but I have to
do a sort of 'reprojecting' to adjust the image to be
compliant with the projection of the map, which is
EPSG:900913. Searching here and the net, it seems I should
use a library/tool called GDAL to do this, but whereas I am
completely new to this I ask you:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Can
anyone address me on how to use it?<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Could
you possibly tell me if what I have just said is correct and
the way I described here is valid?<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">How
could I use gdal to translate my flat unprojected 400x400
pixels image to an image projected in EPSG:900913, and
suitable to be put as an Image Layer as an overlay?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal">Thanks.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#333333;mso-fareast-language:IT">Matteo
Galletti</span><span
style="font-size:10.0pt;mso-fareast-language:IT"> <br>
<br>
</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<br>
<pre class="moz-signature" cols="72">--
Alexandre Dubé
Mapgears
<a class="moz-txt-link-abbreviated" href="http://www.mapgears.com">www.mapgears.com</a>
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