Sean, Somehow I had the feeling that might be the case...
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Sean Gillies Sent: Friday, February 01, 2008 10:53 AM To: [email protected] Subject: Re: [Geowanking] Converting Lat Long to X Y 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 _______________________________________________ Geowanking mailing list [email protected] http://lists.burri.to/mailman/listinfo/geowanking
