# Re: [OpenMap Users] OMScalingRaster

From: Don Dietrick <dietrick_at_bbn.com>
Date: Fri, 14 Oct 2005 10:23:38 -0400

Hi John,

Yeah, the OMScalingRaster assumes three things:

1. The image is north-up
2. The image projection is equal-arc
3. The coordinates are for the corners of the image.

Is your image equal-arc, i.e. the pixel/lat-lon spacings consistent?
That would make it easier.

There was a posting last week on this list about using JAI to rotate
images, that might be something to look at/pursue, to get the warping
in JAI to do the work for you.

- Don

On Oct 14, 2005, at 9:53 AM, John E. McKim wrote:

> 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
> 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
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>
>
>
>
> --
> [To unsubscribe to this list send an email to "majdart_at_bbn.com"
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>

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Don Dietrick, dietrick_at_bbn.com
BBN Technologies, Cambridge, MA
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

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Received on Fri Oct 14 2005 - 10:25:06 EDT

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