Hi Jeroen, digital watermarks is one way to approach the problem.
Another way is to reduce the accuracy and non-graphical attributes in the presentation. If you generate SVGs out of spatial databases you can "filter" your data to reduce the accuracy (reduce the number of vertices). Each time the user zooms or pans he'll just get a customized view of the data which is never at full resolution. To illustrate what I mean, you can have a look at the Yosemite Mapping Project: http://www.carto.net/williams/yosemite/ - the content is always customized to the map extent and the user never sees the full-res data. Also, you don't have to add all important non-graphical attributes of the original GIS data when you generate the SVG, f.e. you don't have to add topological information or non-graphical attributes you don't need for the display. The value of GIS data is not only in the graphics, but in the information as a whole. Andreas --- In svg-developers@yahoogroups.com, Jeroen Vanattenhoven <jeroen. [EMAIL PROTECTED]> 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 > Jeroen > > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm > ------------------------ Yahoo! Groups Sponsor --------------------~--> Most low income households are not online. Help bridge the digital divide today! http://us.click.yahoo.com/cd_AJB/QnQLAA/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/
