[Proj] Help w/Timbalai 1948

[Mikael Rittri]

I tried the predefined instance of the latest Proj version, 4.8.0, like this (where
the -f stuff just gives more decimals):

>proj +init=epsg:29872 -f "%.3f"

114.4   4.175

1718563.021   1515793.018

This is nearly the same as Oscar van Vlijmen's result, except for about 5 millimeters. 

I could also reproduce the EPSG Note 7-2 example, but their result had only centimeter resolution,
so that didn't tell me whether Proj.4 or Oscar's software is best. (But my guess is that Oscar's is best.)

Regards,

Mikael Rittri
Carmenta
Sweden
http://www.carmenta.com

26 jul 2012 kl. 20:22 skrev "OvV_HN" <ovv at hetnet.nl>:

> Re:
> 
> Robert McFaul robert at dgi.com
> Thu Jul 26 11:36:18 EST 2012
> 
> In the course of testing our software I came up with a conflict between our 
> result
> and Blue Marble for the following point. I wonder if some kind person might 
> check
> this on their end and tell me what the number is that they get.
> 
>   Timbalai 1948 / RSO Borneo (Sears Ft)
>   Everest 1830 (1967 Definition)
>   EPSG: 29872
> 
>   Lat:     4.175
>   Long:  114.400
> 
> 
> My reply:
> 
> Since I managed to reproduce the EPSG Guidance Note 7-2 example of Timbalai 
> 1948 exactly, I thought: let's give it a whirl.
> My answer in meters is:
> x = 523817.0979;  y = 462012.9062;
> This is using the parameters from the Guidance Note G7-2, and your lat, lon.
> With a Sears 1922 foot of 12/39.370147 metres I converted the results to:
> x = 1718563.012; y = 1515793.003;
> 
> FWIW of course.
> 
> 
> Oscar van Vlijmen
> 
> 
> 
> 
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