<head></head><body><table><tbody><tr><td colspan="2">Hi matt, <br>
<br>
thanx a lot for the link .... that helps very much constucting the proj4text input, BUT there is still one thing<br>
I do not understand:<br>
<br>
Taking one example from the spatial_ref_sys_table:<br>
<br>
PROJCS["Anguilla 1957 / British West Indies Grid",GEOGCS["Anguilla
1957",DATUM["Anguilla_1957",SPHEROID["Clarke 1880
(RGS)",6378249.145,293.465,AUTHORITY["EPSG","7012"]],AUTHORITY["EPSG","6600"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4600"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-62],PARAMETER["scale_factor",0.9995],PARAMETER["false_easting",400000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","2000"]]<br>
<br>
How do I get the <span style="font-weight: bold;">AUTHORITY["EPSG","7012"]]</span> for a customized prj system ?<br>
What would be for example the AUTHORITY code for GEOGCS["GCS_WGS_1984"]
and how do is exacly use the AUTHORITY withing the <span style="font-weight: bold;">PROJCS[...]</span> string ??<br>
<br>
Thanx a lot ...<br>
<br>
chris<br>
<br>
<br>
</td></tr><tr><td bgcolor="blue" width="5"> </td><td>
Chris,<br>
<br>
Check out
<a href="http%3A%2F%2Fwww.remotesensing.org%2Fgeotiff%2Fproj_list%2Fstereographic.html">http://www.remotesensing.org/geotiff/proj_list/stereographic.html</a>. You
might try translating those projection parameters in addition to +datum
and +units to define this projection.<br>
<br>
matt<br><br><div>On 10/27/05, <b><a href="mailto%3Achristian.michels%40eifelgeist.com">christian.michels@eifelgeist.com</a></b> <<a href="mailto%3Achristian.michels%40eifelgeist.com">
christian.michels@eifelgeist.com</a>> wrote:<blockquote>Hello Together,<br><br>Since
I am using customized projections I need to create my own projection
definition in the spatial_ref_sys_table - but I do not really know how
it works.<br><br>What I have is a ESRI prj file projection definition like:<br><br>PROJCS["Custom",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563
]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Stereographic"],PARAMETER["False_Easting",0],PARAMETER["False_Northing",0],PARAMETER["Central_Meridian",0],UNIT["Meter",1]]
<br><br>Looks a bit like the srtext - but how do I get the definition for the proj4text entry ?<br><br>Any help is very much appreciated !<br><br><br>Cheers<br><br>Chris<br>_______________________________________________<br>
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</a><br></blockquote></div><br><br><br>-- <br>Matt Perry<br><a href="mailto%3Aperrygeo%40gmail.com">perrygeo@gmail.com</a><br><a href="http%3A%2F%2Fwww.perrygeo.net">http://www.perrygeo.net</a>
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