DTED tile lookup in DTEDFrame is bugged.

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Just running the code with specific lat/long to get the elevation.
2. From the interpElevationAt function.


What is the expected output? What do you see instead?
This is using two of the same corners in the tile instead of four distinct 
corners to get the interpreted elevation.

What version of the product are you using? On what operating system?
Openmap 4.6.5. On Windows.

Please provide any additional information below.
I have made a patch and attached a powerpoint on the major changes I made in 
order to get the correct results.

The patch should be applied in this directory: 
openmap-4.6.5\openmap-4.6.5\src\openmap\com\bbn\openmap\layer\dted 

Original issue reported on code.google.com by [email protected] on 15 Aug 2014 at 7:00

Attachments:

• layerdted.patch
• [DTED openmap open source powerpoint.pptx](https://storage.googleapis.com/google-code-attachments/openmap/issue-6/comment-0/DTED openmap open source powerpoint.pptx)