[Geowanking] Converting Lat Long to X Y
David G. Smith PE PLS
dsmith at synergist-tech.com
Fri Feb 1 08:28:55 PST 2008
Sean,
Somehow I had the feeling that might be the case...
-----Original Message-----
From: geowanking-bounces at lists.burri.to
[mailto:geowanking-bounces at lists.burri.to] On Behalf Of Sean Gillies
Sent: Friday, February 01, 2008 10:53 AM
To: geowanking at lists.burri.to
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: geowanking-bounces at lists.burri.to
> [mailto:geowanking-bounces at lists.burri.to] On Behalf Of Mike Liebhold
> Sent: Thursday, January 31, 2008 6:33 PM
> To: geowanking at lists.burri.to
> 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 <mnl at well.com> 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:paul at harwood-leon.com>
> <paul at harwood-leon.com> 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
>
> Geowanking at lists.burri.to
>
> http://lists.burri.to/mailman/listinfo/geowanking
>
>
>
>
>
>
>
>
>
> _______________________________________________
> Geowanking mailing list
> Geowanking at lists.burri.to
> http://lists.burri.to/mailman/listinfo/geowanking
>
>
>
>
>
>
>
> ----------------------------------------------------------------------
> --
>
> _______________________________________________
> Geowanking mailing list
> Geowanking at lists.burri.to
> http://lists.burri.to/mailman/listinfo/geowanking
_______________________________________________
Geowanking mailing list
Geowanking at lists.burri.to
http://lists.burri.to/mailman/listinfo/geowanking
More information about the Geowanking
mailing list