[OpenLayers-Users] Orthorectifying

[Paul Ramsey]

Linda,

Your customer's understanding of "orthorectification" is completely  
wrong (it is a process for taking raw images from planes and  
satellites, and making it map-ready, so that every part of the image  
appears as if view from nadir). So let's ignore the term for now.

Your explanation of what you are doing to get your images, and what  
your customer thinks you are doing wrong, are not clear to me.  Could  
you be a little more detailed about how you are making images for  
openlayers, first of all?

P

On 28-Sep-07, at 2:26 PM, Linda Rawson wrote:

> The map provider I get images from does not have a WMS service.  I  
> have tried to get tilecache to run on IIS and was never  
> successful.  Hence I am grabbing the lat/lon coordinates returned  
> by openlayers creating a single tile and then presenting the image  
> to the user.
>
> My customer says the following:
>
> Looking at the header info on some images downloaded today it  
> appears you are navigating along a lat lon grid as if it were  
> orthogonal. Unfortunately this doesn't work with the imagery as  
> served by the map providers. they "orthorectify" the images so the  
> tiles are in a Cartesian space rather than a spherical space. The  
> means when you move straight east or straight north neither lat nor  
> lon stay constant.
>
> How would I go about orthorectifying my scenario.  Would tilecache  
> take care of this?  Would some minor adjustments to the panning work?
>
> Thanks,
> Linda Rawson
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