Re: [OpenMap Users] OMScalingRaster

From: Carsten . Madsen <com_at_navicon.dk>
Date: Mon, 17 Oct 2005 15:22:11 +0200

You may be able to use gdalwarp
<http://www.remotesensing.org/gdal/gdal_utilities.html#gdalwarp> and
friends to do the reprojections or even convert it to a georef'ed raster
format already supported by OM. Take a look at
http://www.remotesensing.org/gdal/gdal_utilities.html#gdalwarp

regards
/carsten

Gatrell, Mark (SELEX) (UK) wrote:

>Hi John
>
> I have this same problem on all of my images that I am asked to display.
>
> Therfore I purchased the application "Manifold" www.manifold.com .
>
> This package is very reasonbly priced at $250 and will take an image of known projection and re-project it to one sutable for the use in Openmap. If you do not know the projection of the image, it will georeference using 4 or more points(this can be inacurate depending on the original projection, but more points will help).
>
>Take a look at it .. If it helps send me your image and I will re-project it for you to see if it meets your requirements
>
>Regards
>
>Mark
>
>
>
>-----Original Message-----
>From: owner-openmap-users_at_bbn.com [mailto:owner-openmap-users_at_bbn.com]On
>Behalf Of John E. McKim
>Sent: 14 October 2005 14:53
>To: Don Dietrick
>Cc: openmap-users_at_bbn.com
>Subject: RE: [OpenMap Users] OMScalingRaster
>
>
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>
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>
>Hi Don,
> The image is defined in terms of decimal degree lat/lon and
>represents the vertices of the image. The OMScalingRaster only has a 2
>point (ullat,ullon,lrlat,lrlon,image) constructor, but I have been given
>a 4 point lat/lon image to be placed on the map, that needs to be
>georeferenced. The 4 points trace out, counterclockwise, a rectangle
>that is the virtices of the image. So its easy to determine the center
>of the rectangle, but it's a little harder to determine the angle of
>rotation of the image with respect to try north (to use for the
>OMScalingRaster method call (setRotationAngle()), so I thought that I
>would ask if anyone had done it.
>John
>
>-----Original Message-----
>From: Don Dietrick [mailto:dietrick_at_bbn.com]
>Sent: Friday, October 14, 2005 9:39 AM
>To: John E. McKim
>Cc: openmap-users_at_bbn.com
>Subject: Re: [OpenMap Users] OMScalingRaster
>
>Hi John,
>
>Is your image still being defined in terms of decimal degree lat/lon
>data, even with the four points? What do the four points represent?
>
>- Don
>
>
>On Oct 13, 2005, at 6:01 PM, John E. McKim wrote:
>
>
>
>>Hi,
>> I'm trying to display rectangular images on a map but using 4
>>points instead of 2 points. Has anyone developed a routine within
>>openmap or independently that would convert the 4 points into a 2
>>point OMScalingRaster together with a rotation?
>>John
>>
>>--
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>>
>
>
>
>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>Don Dietrick, dietrick_at_bbn.com
>BBN Technologies, Cambridge, MA
>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>
>
>
>
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Received on Mon Oct 17 2005 - 09:23:55 EDT

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