Gentlemen
I have a couple of station descriptions in my possession and a report, both with
details on 2
stations in the Port Area of Colombo. One of the stations is as below. I do not know
if the WGS 84
UTM coordinates are of any use to anyone, they are just part of my output.
Mal Jones
Below is best viewed in a non proportional font.
FUGRO SURVEY - GEO Version 2.38.01
GEODESY 1
Datum : Kandawala
Spheroid : Everest 1830C
Semi Major Axis : 6377276.345 m
Inverse Flattening : 300.801700000
Projection : Transverse Mercator (UTM)
Latitude Origin : 7ø 00' 01.7290" N
Longitude Origin : 80ø 46' 18.1600" E
False Easting : 200000.000 m
False Northing : 200000.000 m
Central Scale Factor : 0.9999238418
GEODESY 2
Datum : WGS 84
Spheroid : WGS 84
Semi Major Axis : 6378137.000 m
Inverse Flattening : 298.257223563
Projection : Transverse Mercator (UTM)
Latitude Origin : 0ø 00' 00.0000" N
Longitude Origin : 81ø 00' 00.0000" E
False Easting : 500000.000 m
False Northing : 0.000 m
Central Scale Factor : 0.9996000000
PARAMETERS FOR CONVERSION FROM WGS 84
Kandawala WGS 84 Geod 1 to Geod 2
dX : 98.300 m 0.000 m -98.300 m
dY : -787.500 m 0.000 m 787.500 m
dZ : -85.000 m 0.000 m 85.000 m
rX : 0.0000 " 0.0000 " 0.0000 "
rY : 0.0000 " 0.0000 " 0.0000 "
rZ : 0.0000 " 0.0000 " 0.0000 "
dS : 1.00000 ppm 0.00000 ppm -1.00000 ppm
TRANSFORMATIONS
Station Name : PW-5
Datum : Kandawala : WGS 84
Projection : Transverse Mercator : Transverse Mercator
Latitude : 6ø 57' 09.3865" N : 6ø 57' 10.5800" N
Longitude : 79ø 50' 37.0926" E : 79ø 50' 44.7687" E
Height : 8.097 m : -93.704 m
Easting : 97459.221 m : 372492.852 m
Northing : 194807.060 m : 768701.916 m
PSF : 1.0000539617 : 0.9998012206
Convergence : - 0ø 06' 44.47" : - 0ø 08' 23.08"
----- Original Message -----
From: Cliff Mugnier - University of New Orleans <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Friday, September 10, 1999 6:08 AM
Subject: GPS: Sri Lanka National Grid System
John,
The Kandawala Datum of 1929 origin is at Latitude = 7* 14' 06.838" North,
Longitude = 79* 52' 36.670" East of Greenwich. The reference azimuth to station
Halgastota = 176* 41' 33.18", and the ellipsoid of reference is the Everest 1830
where a = 6,377,276.345 meters and first eccentricity squared is
0.00663784663020. The scale of the triangulation of the island is dependant on
two bases, each about 5 1/2 miles long, situated at Negombo on the West Coast
(Latitude 7* 10'), and at Batticaloa on the East Coast (Latitude 7* 40') These
bases were originally measured in 1857 and 1859 respectively, remeasured in
1930. The bases agree to 1 in 115,000.
The National Grid System is the Ceylon (Sir Lanka) Transverse Mercator Belt
which is based on the abbreviated Gauss-Kruger (truncated at the fifth
derivative term). The Central Meridian is 80* 46' 18.16" East, The False
Northing Latitude of Origin is 7* 00' 01.7290" North, the Scale Factor at Origin
is unity, and both the false northings and false eastings are 176,000 Indian
Yards where one meter is equal to 1.093619000 Indian Yards.
The International Boundary between Sri Lanka is much simpler than that of
Norway. Your country uses the Principle of Straight Baselines, but the Sri
Lankans use "Great Circle Arcs" (ellipsoidal geodesics) to define their limits
with coordinate points that are expressed in Latitude and Longitude.
Check out the website for the American Society for Photogrammetry and Remote
Sensing at
http://www.asprs.org/resources.html
Under the heading of "Grids and Datums" are a number of my past columns on
various countries, Norway will be the featured country next month (October,
1999).
Cliff Mugnier
--
Clifford J. Mugnier ([EMAIL PROTECTED])
The Topographic Engineering Laboratory
Department of Civil and Environmental Engineering
UNIVERSITY OF NEW ORLEANS
New Orleans, Louisiana 70148
Voice and Facsimile: (504) 280-7095
---------------------------------------------------------------------
Dehls John wrote:
>
> Does anyone know the details of the Sri Lankan national grid system? ie
> projection type and parameters?
>
> John
>
> Dr. John F. Dehls
>
> Geological Survey of Norway
> N-7491 Trondheim
> Norway
> +47 73 90 44 54 - office
> +47 73 92 16 20 - fax
>
> **********************************************************************
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