Hi,
QGIS has an image georeferencing module you could use. Here's an
article about this:
http://glaikit.org/2011/03/27/image-georeferencing-with-qgis/
You'll need to install QGIS: http://www.qgis.org/en/site/
HTH,
Alexandre
On 13-09-23 09:34 AM, Matteo Galletti wrote:
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.
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:
-Can anyone address me on how to use it?
-Could you possibly tell me if what I have just said is correct and
the way I described here is valid?
-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?
Thanks.
Matteo Galletti
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Alexandre Dubé
Mapgears
www.mapgears.com
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