[Geowanking] Map Image APIs
rkgeorge at cadmaps.com
Wed Apr 25 08:55:29 PDT 2007
* Do you mean gridded demographics via OGC-style WCS?
Thanks for the link. WMS/WCS of this type of gridded data is
interesting from a visualization viewpoint. My interest is in exploring new
online TIN modeling tools as an alternative visualization to the more
conventional huemapped displays.
I am downloading a sample of the gridded data now,
http://sedac.ciesin.columbia.edu/usgrid/datacart . I plan to create a
surface TIN and experiment with some features in xbap for online viewing the
generated surface in a static model.
JPL offers an extension to WMS with int_short elevations as png for a
variety of srtm and ned dem (when their server is not overloaded) but a
16bit range is too small for demographic data sets. I haven't seen it used
much but assume that TIFF/GeoTIFF is also available as a GetMap format for
most WMS and would allow a more useful range but larger files. WCS offers a
standards based approach with larger range options as GeoTIFF, GML, DTED,
NTIF exports. Eventually WPS offers the potential of chaining WCS algorithms
from disparate sources, which is where the real fun begins.
The potential for online WCS surface viewing is where my
interest is taking me at the moment. I believe it should be of interest but
I don't have a use case in mind as much as curiosity about the potential of
XAML/xbap, of course x3D and KML have similar capabilities. A WCS published
source gives more options and the newer servers often provide KML reflectors
as well as more open standards for wider useability.
If CIESIN publishes this data as an OWS it provides a resource for scale
dependent surface models in the browser instead of one off workstation
modeling. This is the direction that the national geospatial infrastructure
should be moving for all agencies. I see NASA's logo on the CIESIN site I
get the feeling you/they see the potential more than some others.
From: geowanking-bounces at lists.burri.to
[mailto:geowanking-bounces at lists.burri.to] On Behalf Of Greg Yetman
Sent: Tuesday, April 24, 2007 7:26 PM
To: geowanking at lists.burri.to
Subject: Re: [Geowanking] Map Image APIs
Do you mean gridded demographics via OGC-style WCS? Or something different?
We (CIESIN) have gridded US census data based on blocks with OGC style WMS &
WCS services in the works:
If you have particular use cases for these types of data in mind let me
know, we're interested in feedback on the data and what kind of services
will be most useful.
On 4/24/07, Randy George <rkgeorge at cadmaps.com> wrote:
I like this!
" The Geography Division will release more information on these new products
over the next year."
It would also be interesting to see what could be done with a WCS set of
demographic fields perhaps connected to block centroids. That should be
dense enough to make a surface at state and national scales. 3D thematics
could be an interesting view. Perhaps the 'Geography Division' can pass the
goodness along to the 'Demographics Division' :) Then we could stack
selected fields in additive WCS images to look for singularities and such,
maybe throw in some NIH surfaces too.
Sorry, "give them an inch and they want the whole mile"
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