Who would have thought there were so many wanking surveyors? We even
have a Professional Engineer! I'd better not tell any engineering jokes.
Landon
________________________________
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of David G. Smith
PE PLS
Sent: Friday, February 01, 2008 7:43 AM
To: [email protected]
Subject: RE: [Geowanking] Converting Lat Long to X Y
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 <[EMAIL PROTECTED]>
<mailto:[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
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--
Will King
0044 (0) 77950 96645
http://geodatasolutions.co.uk
GPS Surveying | Location Data Capture | GIS Digital Mapping
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