hi,
it is a common practice in mapping to introduce errors in maps and GIS
datasets in order to recognize them later as yours. there is no
difference between desktop maps and paper maps.
but i don't think that it makes sense to laboriously scramble your data.
the main problem is that after import, re-export, coordinate system
transformation etc. it will be difficult to find the way back to some
algorithm. it is far better and easier to tile your data and send it
out in some unknown projection and coordinate system. that way
fraudulent people may only able to fit the tiles together and guess the
underlaying coordinate system. this process is as stupid and time
consuming as scanning and digitizing paper maps, so few people will do
that. of couse, all this requires intelligent server side solutions.
on the other hand you are right: there is always a way of getting some
valuable information out of SVG files on the internet. but anything can
be stolen and reused...
--
André M. Winter
[EMAIL PROTECTED]
www.vectoreal.com ...for scalable solutions.
---------------------------------------------
Austria
Phone: +43 5234 32732
Jeroen Vanattenhoven wrote:
> Ronan Oger schreef:
>
>> Are you using GIS data or SVG pictures of the GIS model?
>>
> We use SVG conversions of Shape files. We altered the layers of the map,
> and will add additional information to the map (and interactivity).
>
>> SVG is a model of a picture, whereas GIS is a model of geographic data.
>>
>> A picture of a car is not the same as the engineering drawing of a car. And
>> a
>> screenshot of an Autocad drawing does not give away the car CAD drawing.
>> There is loss in the conversion process, and the same happens with GIS->SVG
>> transformation.
>>
> I'm wondering if the result of the conversion (svg picture) is not
> important? It still contains some geographic data: rivers, borders,
> roads, ... . As I've read here,
> some GIS companies probably insert a watermark (to the coordinates of
> the river, border and road elements?). That would be very useful in my
> opinion.
>
>> Ronan
------------------------ Yahoo! Groups Sponsor --------------------~-->
Get Bzzzy! (real tools to help you find a job). Welcome to the Sweet Life.
http://us.click.yahoo.com/A77XvD/vlQLAA/TtwFAA/1U_rlB/TM
--------------------------------------------------------------------~->
-----
To unsubscribe send a message to: [EMAIL PROTECTED]
-or-
visit http://groups.yahoo.com/group/svg-developers and click "edit my
membership"
----
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/svg-developers/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
