No, don't use the GeoRSS elevation tag. It's broken. Use a 3D coordinate system instead.
Cheers, Sean David G. Smith PE PLS wrote: > A typical architectural survey would involve starting from a given point of > reference (e.g. a particular corner of the room) and measuring along walls, > et cetera - it may help to utilize a CAD package, if available. Internal > representations in CAD software are rectangular coordinates, and you can > start or assign the reference corner 0,0 (it may actually be prudent to > increment those to a larger number, in case your scope expands, to avoid > going into negative numbers) - having measured the perimeter and checked it > for closure (the assumption that walls all meet at perfect 90 degree angles > isn't always valid) you can then use this as a basis for measuring the > location of objects within the space. Similarly, assign a base floor > elevation as your base datum and measure up from it. > > Speaking to the GeoRSS spec, perhaps the "Elevation" tag is what you're > looking for (though it raises another question of whether or not your > software of choice actually recognizes or implements it properly): > > http://www.georss.org/model > > Elevation > > > In order to provide a means of expressing an elevation, the Simple form of > GeoRSS has two special tags. These tags are not meant to be used in the GML > version since elevation values would be properly expressed based in more > precise terms. The tags are elev and floor. > > elev is meant to contain "common" GPS elevation readings, i.e. height in > meters from the WGS84 ellipsoid, which is a reading that should be easy to > get from any GPS device. > > floor is meant to contain the floor number of a building. In some countries > the numbering is different than in other countries, but since we'll know the > location of the building, it should be fairly unambiguous. > > > > http://www.georss.org/1 > > > Elevation > > > Elevation, specified in attributes to GeoRSS Geometry objects, can be > expressed as "elev" or "floor". elev is meant to contain "common" GPS > elevation readings, i.e. height in meters from the WGS84 ellipsoid, which is > a reading that should be easy to get from any GPS device. floor is meant to > contain the floor number of a building. In some countries the numbering is > different than in other countries, but since we'll know the location of the > building, it should be fairly unambiguous. > > > > <georss:point elev="313">45.256 -110.45</georss:point> > > > > <georss:point floor="2">45.256 -110.45</georss:point> > > > > > > > Hope this helps, > > Dave Smith > > _____ > > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Mike Liebhold > Sent: Thursday, January 31, 2008 6:33 PM > To: [email protected] > Subject: Re: [Geowanking] Converting Lat Long to X Y > > > e.g: http://www.youtube.com/watch?v=fPgV6-gnQaE > > > Mike Liebhold wrote: > > Thanks Will, > > I think I get all that. ( but I'm not sure where 'level' should be... > sealevel?) But what coordinate reference system, and what semantics should > i use to making everything painlessly web accessible? > > GeoRSS is 2D. > > -m > > > > Will King wrote: > > Mike > > After asking myself why;-) here's a quick and dirty method. > > First measure the lengths of your walls with tape or disto. Lets say your > room is 10 metres by 5 metres. Then divide this into theoretical grid > squares of your choosing ie 1 metre squares. > > Pick a corner and call this 0.000, 0.000 (this is your bottom left of your > living room "grid" if you drew it on paper). Diagonally across (ie top > right corner) from this coordinate is 10.000, 5.000. You can then get any > coordinate in the room from this grid. > > To get a z level (elevation) measure up from your floor and "set a level" > one metre or whatever up, mark it with pencil etc. > > Will > > > On Jan 31, 2008 10:24 PM, Mike Liebhold <[EMAIL PROTECTED]> wrote: > > > I'm thinking of mapping my living room. Does anyone have any sugggestions > How should I convert the location of furniture, lamps, into location > coordinates? I think I know how to do x and y, but z is a problem, though > highly useful for finding things like books. > > - mike > > > John Handelaar wrote: > > On Jan 31, 2008 9:34 PM, Paul Harwood <mailto:[EMAIL PROTECTED]> > <[EMAIL PROTECTED]> wrote: > > > > Hi, > > > > Just a lazy question from a novice geowanker I suppose...but it might save > > me an evenings surfing though if you can help. > > > > I have googled a bit, with a few solutions... but does anyone have a perl > > script (or a site) to hand, to do Lat Long conversions to X Y? I have UK > > postcode/outcode/location database that I want to convert from L Lo to X Y. > > > > Again, "X Y" doesn't seem to mean anything specific, but a number of > > useful tools and code samples, including stuff relating to OSGB grid refs, > > can be found here: > > > > http://www.nearby.org.uk/downloads.html > > _______________________________________________ > > Geowanking mailing list > > [email protected] > > http://lists.burri.to/mailman/listinfo/geowanking > > > > > > > > > > _______________________________________________ > Geowanking mailing list > [email protected] > http://lists.burri.to/mailman/listinfo/geowanking > > > > > > > > ------------------------------------------------------------------------ > > _______________________________________________ > Geowanking mailing list > [email protected] > http://lists.burri.to/mailman/listinfo/geowanking _______________________________________________ Geowanking mailing list [email protected] http://lists.burri.to/mailman/listinfo/geowanking
