Re: [OpenMap Users] Map format

Hi Eriend,

On Jan 9, 2004, at 1:30 PM, <Erlend.Larsen@ffi.no> wrote:

> Hi! I'm exploring OpenMap in an attempt to plot position data from
> several airborne vehicles at once and follow them at close range
> (about 1:50000), and I have some questions when it comes to using
> OpenMap with various data formats.
>
> Is it possible to use scanned maps in OpenMap? If so, what tools do I
> need, and how do I go on about it? (Preferably in short easy steps.)
> Is it possible to accomplish viewing scanned maps in OpenMap using
> only freeware? I have heard about GeoTiff, but I'm not sure if anyone
> has picked up on Don's challenge:
> <http://openmap.bbn.com/mailArchives/openmap-users/2002-06/0901.html>.
> I know I'm too small for such a task :)

It is possible, but the projection of the scanned maps may affect
accuracy of points overlayed on top of them. If you scan the map and
note the upper left and lower right coordinates, you can use the
com.bbn.openmap.plugin.CSVTiledImagePlugin to display it. It just
needs to be in any format java can handle (gif, jpg, tiff, bmp), and
you create a csv file that lists the coordinates and image location.
There are instructions on what the csv file should look like in the
javadocs for the CSVTiledImagePlugin, as well as the properties for the
plugin to get it added to the openmap.properties file and the
application.

We've run demos before doing this, and you can get pretty good results
depending on the map.

> I have also access to digital map data on ESRI Shape format 1:50000,
> but it is pre-projected (ref. FAQ 9.10). Is there any way of
> converting pre-projected shapefiles to lat/long format, or do I have
> to go shopping?

There are programs that can do this (I'm guessing that GRASS might),
and I know some of the ESRI products can do it too. It might depend on
your platform. You might have to go shopping, or look for a projeciton
conversion tool and try to combine it with shapefile reading/writing
code. It's probably not as hard as it sounds. :)

> BTW I'm exhilarated by the tremendous versatility of OpenMap!

Thanks, that's nice to hear!

- Don

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