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| Subject: | MobileLBSList: RE: GML, OGC, etc. |
| Date: |
08/31/2000 10:22:09 AM |
| From: |
creediii@mindspring.com |
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Sounds like a leading question to me :-)
There is more to the requirements for geography and wireless location
based services than meets the eye. While the presentation of
locationally referenced information on a WAP/WML enabled device may at
face value appear trivial when compared to full blown GIS applications
there is much going on behind the scenes:
a.. We are concerned with more than just point locations. There are
also line, polygon, and related geometries to consider. Further, 3G
enabled devices appear to be able to support full color, styled
portrayal (like real maps, not just stick displays). The OpenGIS (r) GML
specification supports the
ability to express multiple geometry types. Further, through XSLT, it
allows the application server to specify styling/portrayal rules to the
client.
b.. We are dealing with coordinate and projection systems. We cannot
assume that all spatial content providers will provide geometry in a
single coordinate/projection system. GML supports the ability to express
information regarding spatial reference systems.
c.. Spatial content for use by wireless devices will ultimately be
served from multiple providers, all using different storage structures
and technologies. GML provides a "lingua franca" that will allow many
data sources to be "fused" and used by the wireless device.
d.. Given time, I could add many more reasons, but I suggest instead
that everyone check out http://www.galdosinc.com/reasons_for_gml.htm
In terms of who is using GML? Well, expect many announcement early next
year. GML is the foundation interoperability capability being used in
two OGC Interoperability Testbeds: Web Mapping II and Geospatial Fusion
Services. The US Census has put a contract in place with
Galdos to develop and field a TIGER to GML capability for use through the
Census Data Clearinghouse.
Cheers
Carl Reed
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