[Mapit] Re: Data format

[Bernhard Reiter]

Hello Jean-Marc,

you have send Bernhard Herzog an Email about MapIt!.
As Bernhard currently is on vacation he forwarded the email to me,
so you can get a timely answer.

(Note that there is also a mailinglist for questions related to MapIt!
At: http://intevation.de/mailman/listinfo/mapit 
Do I have your permission to forward this mail to the public list
for the benefit of all readers?)

On Tue, Nov 09, 2004 at 07:31:51AM +0100, Jean-Marc Tourreilles wrote:
> I am very interested by Mapit! which is simple and works (!).
> 
> I want to create a database of satellite photos of the Sahara. I got 
> very big raster pictures, about 100 to 300 Mo in MrSID format) on the 
> site https://zulu.ssc.nasa.gov/mrsid/.
> 
> I want to add some informations about gas station for example.
> 
> My problems are:
> - how do I prepare my pictures to use them in Mapit! ?
> - how can I keep the corrdinates inside them?
> - is it possible to display very big pictures without crop them (the 
> acuracy of the picturs is the most intersting thing after be able to 
> navigate  inside)
> - is there a doc about prepraring the data?

To answering a few question together:
	There is a document about how to prepare data for MapIt! 
	http://www.mapit.de/data.en.html
	It should be straight forward telling you about 
	the principal steps and how to do the markers.

It is possible to display big picture just adapt the configuration, 
the tiling is done 
so that Mapit does not have to keep all pictures in the memory.

The problem with MrSid data is that 
Python does not have a library to directly read them. 
The technology is patent encumbered, which makes it hard for Free Software.

If you are a developers, you might be able to get somewhere with
the library from http://djvulibre.djvuzone.org/.
(Again if you are a developer or want to contract us or anybody,
having this integrated in GDAL and connect GDAL to MapIt! certainly
are goals worth pursuing. ;) )

Best Regards,
	Bernhard R.
-- 
Professional Service for Free Software                 (intevation.net)  
The FreeGIS Project                                       (freegis.org)
FSFE                                                    (fsfeurope.org)
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