ISSUE-64: Support for barometric and EGM96 altitudes

Support for barometric and EGM96 altitudes

State:: CLOSED
Product:: GeoAPI V1
Raised by:: Matt Womer
Opened on:: 2009-07-20
Description:: From: http://lists.w3.org/Archives/Public/public-geolocation/2008Nov/0130.html
Raised By: Erik Wilde

"EGM96 altitudes are more precise, and there also are quite a large number of devices out there measuring barometric pressure for altitudes (which, if properly adjusted, is considerably more accurate than GPS-based altitudes)."

More:
http://lists.w3.org/Archives/Public/public-geolocation/2008Dec/0002.html
http://lists.w3.org/Archives/Public/public-geolocation/2008Dec/0003.html

Conclusion: proposal rejected, the altitude value exposed by the spec is always in meters over the WGS84 geoid. The way the altitude is measured is an implementation detail. If an implementation measures the barometric altitude, then it must convert it to meters over the WGS84 geoid.
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