[OpenLayers-Users] how to project a flat image to spherical mercator EPGS:900013 to use in a Image Layer in openlayers

[Alexandre Dubé]

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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