USER GRIDS
(16 Aug 1998)
From: Collin Tang, Singapore. waypoint@infantry.com
If you have other User-Grid data, please contact Collin
New Zealand Grid (NZMG) from Norris Weimer
(This is a rough estimation due to the different basis on which the NZMG is
based on. Errors vary from a few metres in the central regions of the map to
a kilometre at the extremes. Bearings will therefore also be affected.)
Longitude Origin - E173 deg 26.45'
False Easting - 2510000.0 m
False Northing - 10563802.0 m**
Scale - 1.0
Datum - Geodetic Datum 1949
**Important note for Garmin users: Remember this!
The false northing value you just entered is wrong. On the Garmins, you can
only enter 7 digits, not 8, so enter 9563802.0. It should really be
10563802.0, but since there is no way to enter that number, the best we can
do is enter a number*exactly* 1,000,000 less and remember to add 1,000,000
to all of the Northing values the Garmin produces. In practice, this won't
be any problem; you probably know where you are to within 1000 km even
without the GPS. But watch out when you enter waypoints directly into the
GPS derived from a map. By the nature of the UTM projection, it does not
matter at all that we had to give it a value 1000000 short; the False
Northing value only changes the labels, not the projection itself. There is
no accuracy lost by using the wrong False Northing value. The real errors
come from using the UTM projection instead of the NZMG projection.
Cassini Soldner Grid (Singapore) from Francis Tan. Nanyang Tech.
University,Singapore.
Longitude Origin - E103 deg 51.180'
False Easting - 30000.0 m
False Northing - -112349.0 m
Scale - 0.9998600
Datum - Kertau 1948
W Malayan RSO(Malaysia) from Laurence Poh, Malaysia
Longtitude Origin - E102 deg 25.000'
False Easting - +491645.0 m
False Northing - +574.4 m
Scale - 0.9996000
Israeli Grid (New & Old)
Latitude Origin - N31.73409 deg
Longitude Origin - E035.21206 deg
Scale - 1.0
Units to Metre Conversion - 1.0
False Easting at Origin - 00170251.0 m
(New Israel grid: 00220251.0 m)
False Northing at Origin - 01126868.0 m
(New Israel Grid: 00626868.0 m)
User Datum for Israeli Grid
LCL TO WGS84 DELTA A: -0163.789 m
LCL TO WGS84 DELTA F (X 10,000): -0.54739085
LCL TO WGS84 DELTA X: -0235.0 m
LCL TO WGS84 DELTA Y: -0085.0 m
LCL TO WGS84 DELTA Z: +0264.0 m
Dutch Grid (RD Cordinates)
Longitude Origin - E 005° 23.258'
Scale - 0.9999079
Units to Metre Conversion - 1.0
False Easting at Origin - 0155000 m
False Northing at Origin - -316592/3 m
User Datum for Dutch Grid
LCL TO WGS84 DELTA A: 740 m
LCL TO WGS84 DELTA F (X 10,000): 0.1003748
LCL TO WGS84 DELTA X: 593.0 m
LCL TO WGS84 DELTA Y: 26.0 m
LCL TO WGS84 DELTA Z: 478.0 m
Cassini Soldner Grid (Singapore) from Francis Tan. Nanyang Tech.
University, Singapore.
Longitude Origin - E103 deg 51.180'
False Easting - 30000.0 m
False Northing - -112338.0 m <- UPDATE
Scale - 0.99986
Datum - Kertau 1948