[Proj] Proj Digest, Vol 82, Issue 7

Melita Kennedy mkennedy2 at earthlink.net
Tue Mar 29 22:14:53 EST 2011

-----Original Message-----

>Date: Mon, 28 Mar 2011 11:44:52 -0700
>From: "Geoff Shipton" <geoff at tritonimaginginc.com>
>Subject: [Proj] PROJ4 7 parameter datum shift Beijing 1954
>To: <proj at lists.maptools.org>
>It is built on Beijing 1954 and uses that datum, the 7 parameter shift he
>gives are as follows:
>TX:          170.076
>TY:          154.924
>TZ:          97.308
>RX:         1.666408
>RY:          0.872624
>RZ:          -8.648183
>K:            0.00000186


In addition to changing the signs of the rotation parameters as Noel suggested, also convert the K: 0.00000186 to ppm, 1.86 and try that. 

A lesser possibility is that the directionality is wrong and these parameters convert from WGS84 to Beijing 1954. 


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