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| -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 |