Re: [OpenMap Users] DTED viewing solved

Hi Chun,

On Monday, January 13, 2003, at 11:27 PM, Lee Chun Leong wrote:

> Hi Don
>
> Thanks for your suggestion. Am i glad to say that now i am able to
> display my dted data successfully. i would like to share my experience
> for those who are using dted data. Imperative, is the coordination of
> the data. The problem why i can't view my dted data is that mine
> to-be-viewed dted data is not in the default lat long coord and have
> to navigate and soon into the area to preview the data. hence instead
> of debugging my own problem, i reuse the openmap example app and set
> the corresponding properties file and regenerate my own jar file.

The easiest thing to do to peruse DTED data is to modify the
openmap.properties file so that the jdted maker name is in the
openmap.layers property, and then modify the jdted properties to match
your system configuration. You can change the lat/lon startup point in
the properties file if you like, too.

Then, you can save the openmap.properties file in your home directory,
and run the openmap application via the startup scripts in the bin
directory.

> I have tried using the terrain tools LOS but unlike the Profile, it
> does not show up any image after creation. Puzzled by its behavior.
> Please advise.

The LOS setup is similar to the Profile tool, but you define a circular
area of interest. The tool will render an overlay on the map when it's
completed, showing green areas in the circle where there is LOS from
the center point. If you aren't getting any output, it's possible that
the center point isn't within LOS from the surrounding points. You can
try increasing the center height to check to see if the tool is
operating properly.

> I have scanned through that OpenMap has 3D facility. I have tried
> incorporating the View3D launcher but it crashes. I believe that that
> is not that simple just placing a view launcher. Is that anything i
> need to setup?

You do need to install Sun's Java 3D package on your system.

> DTEDcoverage layer is obscure to me. Could you explain its uses or
> is there any references to demonstration how it is employed?

The JavaDocs for the layer list the properties that are needed for the
layer, and you should configure the paths to match the paths in your
DTEDLayer. The DTEDCoverageLayer simply draws rectangles on the map
showing where your DTED data is located. It does try to create a file
that makes it load faster, so your properties should reflect a coverage
file path in a place where it can be written if it doesn't exist.

- Don

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Don Dietrick, BBN Technologies, dietrick@bbn.com
10 Moulton Street, Cambridge, MA 02138
617-873-3031 [fax]-2794
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