Hi,
It is interesting to note from the discussion that vectors are
implicitly regarded as a much higher value than imagery ala Google, Yahoo,
MapQuest etc Theft is not a significant problem to their services partly
because images are less valuable than vectors and but even more because the
service cost benefit dwarfs the cost of any effort to steal the data.
Vectors are more valuable:
The ongoing web services standards at OGC have provided OWS specs
for both imagery WMS/WCS and vectors WFS, but there are still few public WFS
services currently available (relative to WMS). GIS data as public
infrastructure gains considerable value when published in vectors i.e. WFS.
Public GIS data services provided by governments (US Census, USGS, NOAA,
BTT, FEMA etc) would greatly enhance data value/utility by publishing
vector WFS. This in turn increases the value of SVG since it is the
best/only open vector standard for the rendering part of public data chains:
Spatial database => OWS/WFS => browser/SVG
Service is even more valuable:
SVG rendering though only provides a small view at a time of the
underlying model and there is little value in scraping the location vectors
from the svg browser to attempt a reconstruction of the whole model. Why do
it since you would need to laboriously recreate and maintain a massive GIS
data structure? Better to pay a license fee or put up with advertising
aggravation for the benefit of the well maintained universal coverage on a
service provider's hardware.
For example even though it is possible to download every tile of
every level of GoogleMap and steal their data why do it? The cost of
downloading and maintaining on locally purchased hardware far outweighs the
cost of using GoogleMap (especially since it works on the advertisement
model).
Solution: less concern about protecting data and more attention to a
low service cost/benefit ratio.
Looking forward to public WFS services
randy
-----Original Message-----
From: [email protected] [mailto:[EMAIL PROTECTED]
On Behalf Of Andre M. Winter - Carto.net
Sent: Monday, November 14, 2005 6:30 AM
To: [email protected]
Subject: Re: protecting SVG is pointless - was Re: [svg-developers] Protect
SVG - Was Re: Today's Joke: Printing SVG in IE
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
-----
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
------------------------ 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/
