Re: UML Geotiff

On Wednesday, June 5, 2002, at 01:18 PM, Norman Barker wrote:

> Thanks Don,
> I agree that a java geotiff isn't too hard to implement.
> Niles Ritter web page www.geotiff.org is the page with the java geotiff
> jai files, including a .net version. Dr. Ritter is the guy who wrote
> the geotiff spec, and the original c code I believe.
>
> I have found the jai-geotiff very easy to use and it displays a
> geotiff very easily. Getting this into openmap is easy too, using the
> tiff code samples in the JAI you can get the tiff image into buffered
> image and hence into an OMRaster. (Thanks to Steve McDonald of
> GeoVirgil fame for this help).

That's good to know, thanks.

> My questions were mainly related to openmap and how to utilise the
> underlying EPSG libraries from geotiff into OpenMap and the like. I
> would really like to see how to render the geotiff in its correct
> projection etc. A minor problem is that most geotiffs store their
> location in UTM form, so you have to use UTMPoint. I would like to
> develop this geotiff function for OpenMap and would appreciate any help.

This is a tougher nut to crack, and we'll be addressing it this year.
OpenMap doesn't support pre-projected data, because the projections
translate decimal degree coordinates directly to screen x/y. There's
no real mechanism yet for jumping in somewhere in the middle, although
there is a sketchy plan.

> Finally I recompiled the J3D for Openmap into a new jar file, how do
> you actually use the the Pilot package?

You add the PilotPlugIn as you would a layer in the openmap.layers
property in the openmap.properties file. Turn it on, and bring up it's
palette (by clicking on it's green status light or through the
LayersPanel). Define a pilot path, which will bring up another palette
for the path which has a button to create a J3D scene to fly through.
Make sure the timer for the PlugIn is enabled, and that the pilot is not
stationary.

> Thanks everyone, the new release of OpenMap is great, utilising SVG is
> fantastic for me since the Ordnance Survey in England have released an
> XSL file for GML that converts it into SVG!!

Cool, glad to hear that.

- Don

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