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| author | Frank Warmerdam <warmerdam@pobox.com> | 2005-11-30 17:03:54 +0000 |
|---|---|---|
| committer | Frank Warmerdam <warmerdam@pobox.com> | 2005-11-30 17:03:54 +0000 |
| commit | 85d45256efdc41f7245f87bb4ca63dbaf163705e (patch) | |
| tree | d9a23295ed4230fff75396e0f04dc4a60ca99843 | |
| parent | d35786eafa65cf86abf2d9b65fcc6a95559606af (diff) | |
| download | PROJ-85d45256efdc41f7245f87bb4ca63dbaf163705e.tar.gz PROJ-85d45256efdc41f7245f87bb4ca63dbaf163705e.zip | |
Updated note on rotational parameters in 7 parameter transformation.
git-svn-id: http://svn.osgeo.org/metacrs/proj/trunk@1314 4e78687f-474d-0410-85f9-8d5e500ac6b2
| -rw-r--r-- | html/gen_parms.html | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/html/gen_parms.html b/html/gen_parms.html index 70824560..49529ebc 100644 --- a/html/gen_parms.html +++ b/html/gen_parms.html @@ -96,12 +96,8 @@ using an approximated 7 parameter transformation.<p> The seven parameter case uses <i>delta_x</i>, <i>delta_y</i>, <i>delta_z</i>, <i>Rx - rotation X</i>, <i>Ry - rotation Y</i>, <i>Rz - rotation Z</i>, <i>M_BF - Scaling</i>. The three translation parameters are in meters as -in the three parameter case. The rotational parameters are not in physical -units. They are something like the sine of the rotational angle times the -ellipoid axis length, but I don't know the exact details of how to derive -these from a physical description of the rotation. What I do know is that -they match the parameters used for transformation method 9606 in the EPSG -database. The scaling is apparently the scale change in parts per million.<p> +in the three parameter case. The rotational parameters are in seconds of +arc. The scaling is apparently the scale change in parts per million.<p> A more complete discussion of the 3 and 7 parameter transformations can be found in the EPSG database (trf_method's 9603 and 9606). Within PROJ.4 |