At 3:14 PM -0500 11/1/05, Guest via RT scribbled:
Show quoted text>This message about Geo-Ellipsoid was sent to you by guest <> via rt.cpan.org
>
>Full context and any attached attachments can be found at:
><URL:
https://rt.cpan.org/Ticket/Display.html?id=15453 >
>
>Hello there,
>
>after reading the documentation for Geo-Ellipsoid-0.901, it seems
>that there might be a minor flaw in the module: I believe that the
>flattening for the WGS84 ellipsoid is slightly different than that
>for the GRS80 ellipsoid. The flattening value 1/298.257223563 is
>what I've seen for the WGS84 ellipsoid, rather than a duplicate of
>the 1/298.25722210088 flattening value of the GRS80 ellipsoid. If
>that is indeed the case, then correcting the value for the module
>and its documentation should be fairly simple.
>
>Thanks for making the module available to all!
>
>Christian Carey
>
>ccarey at-sign capaccess full-stop org
Thanks for the comment. I took the WGS84 value from the original
Fortran program at <ftp://ftp.ngs.noaa.gov>, which has the comment
that this value applies to WGS84, GRS80, and NAD83. However,
additional research on the web substantiates the value of
1/298.257223563 as the "official" WGS84 value, as you point out.
There are some comments in papers that make me wonder if the
difference is actual or just a difference in terminology between
GRS80 and WGS84. I will change the value in my module at the next
upload.
Thanks again for your help.
--
- Jim Gibson
email: Jim@Gibson.org
