On Mar 8, 2008, at 11:31 AM, [EMAIL PROTECTED] wrote:
If your raster data is only for display purposes, it does not
make sense to put them in a data base. You should look
at an efficient raster access protocol. Google's SuperOverlay
mechanism (image pyramids) is very interesting. Creation of
SuperOverlay was recently implemented in GDAL.
You can always keep the metadata in the database, to do
fast searches on your coverage. SuperOverlays can be extended
to handle local projection, if you need something else than longlat
(which is usually the case).
Greetings Guido,
Yes - my products are UTM, however, I am not sure what projection the
online version will be as I don't want to have to deal with multiple
zones...
If you somehow need programmatic access to your raster data (e.g.
extracts, image processing) you need to develop some geo-spatial
application server layer, which would combine your PostGIS feature
data with the rasters in the SuperOverlay structures.
Thanks for the information about SuperOverlay - sounds perfect - I
will check it out now.
What puzzles me is the combination of 10 TB of data and a shoestring
budget. This requires some nasty server solution, whatever the
mechanism you want to use. It's the playing ground of the Google,
Virtual Earths, NASA WorldWind kind of folks.
Not really the shoestring kind.
Yes - I understand your point. I am self-funded (been working on my
solution for 10 years now). I am starting out with about 50 GB of
imagery and working my way up (each quad is about 120 MB in imagery +
pyramids). I am past my initial startup phase (I have product in
stores) and the more products I have the better my budget will be.
Also, now that I have product in stores, I am looking at putting it
online which will be done one quad at a time (I plan to have a free
viewer and sell higher resolution [with vector art] downloadable
PDFs). I have two types of products planned - a provisional
autonomously created product and a manually updated current product.
I am getting close to letting my system "rip" on entire states for the
provisional version. As I add more and more products online and in
stores, I should have more and more capital to invest.
In other words, I am not just going to start out with 10 TB - that is
sometime down the road. And thanks to Moore's law - storage and more
powerful servers will be much more affordable by the time I have 10 TB
to serve.
Ciao,
Jeshua Lacock
Founder/Programmer
3DTOPO Incorporated
<http://3DTOPO.com>
Phone: 877.240.1364
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