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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: [gislist] Calgary 3TM definition |
| Date: |
09/12/2006 02:30:00 PM |
| From: |
Senthil Kumaran |
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Dear Murali Krishnan,
The following details should be useful to you
THE CITY OF CALGARY is mapped according to the following specification
NAD83 (Adopted) Datum
3 Degree Transverse Mercator (3TM) Projection
Central Meridian 114 Degree
Mapping Plane Coordinates
Digital files are maintained in MicroStation Format (file extension .DGN) and are normally made available in AutoCAD 1400 format (file extension .DWG).
Working Units:
Master Units: metre
Sub Units: millimetre
Resolution: 1000 mm per m & 25 positional units/mm
Working Area: 171,798 m2
UOR: units of resolution
1 UOR: 1/25 mm
Global Origin:
UOR Values:
X= -110,648,850.0000
Y= 141,411,270,800.0000
Coordinate Values (As defined in MicroStation using GO=$):
N = -5570551.4861
E = 90325.2999
regards
S.Senthil Kumaran
geosensing@yahoo.com
Murali Krishnan <magik_sg@yahoo.com> wrote:
Hi,
I am looking for the definiton for Calgary 3TM
coordinate system.
Searching the web, I have got a few parameters, but
not the entire definition. It will be great if anybody
can help. I am hoping to view City of Calgary shape
and dgn files using the coordinate system.
Central Meridian = 114
Scale Factor - 0.9999
What about the latitude of origin and False Eastings
and Northings ??
Thanks In Advance
Murali Krishnan
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