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First. "trillion" seems to have a ambiguous definition in Kdict so I am not sure about<BR>
your what you mean here. Is it greater or lesser than a gazillion? :-) sorry about my humor.<BR>
<BR>
Secondly, I am not sure I am aware of the +ellps=sphere option. When I try it on lproj<BR>
I get a segmentation fault which I am looking into at this moment. Note any undefined<BR>
ellipsoid name creates the same error.<BR>
<BR>
One thing I will note is that I am more familiar with specifying the two points in an west<BR>
to east orientation so that point 1 would be 22.5,90 and point 2 -45,180 so that I am<BR>
not sure that reversing the order will not generate unexpected results.<BR>
<BR>
There is definitely one bug item here and you will hear more from me in the near<BR>
future.<BR>
<BR>
On Thu, 2005-07-07 at 10:14 -0500, William K wrote:
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<FONT COLOR="#000000">Sorry to repeat, but I need to know if anyone has any ideas on this:</FONT>
<FONT COLOR="#000000">I want to set up a map with the Oblique Cylindrical Equal Area </FONT>
<FONT COLOR="#000000">projection (ocea). I couldn't find much info on parameters needed </FONT>
<FONT COLOR="#000000">and the effects of them. From what I found in the USGS projections </FONT>
<FONT COLOR="#000000">book I need two points for the oblique line (lat_1, _2, lon_1, _2). </FONT>
<FONT COLOR="#000000">Simple enough. Yet I get projected coordinates in the trillions! </FONT>
<FONT COLOR="#000000">It's not an easting/northing problem - I get +/- trillions around the </FONT>
<FONT COLOR="#000000">center of the projection.</FONT>
<FONT COLOR="#000000">this is what I used (Australia/SE Asia region):</FONT>
<FONT COLOR="#000000">proj +proj=ocea +ellps=sphere +lat_1=-45 +lat_2=22.5 +lon_1=180 </FONT>
<FONT COLOR="#000000">+lon_2=90</FONT>
<FONT COLOR="#000000">(I tried ellps=WGS84 also)</FONT>
<FONT COLOR="#000000">Changing the distance between the oblique points seems to affect the </FONT>
<FONT COLOR="#000000">projection a bit - instead of at the limits of the area of interest, </FONT>
<FONT COLOR="#000000">if I make them say 1/10 of that apart, the coordinates go down by up </FONT>
<FONT COLOR="#000000">to a trillion.</FONT>
<FONT COLOR="#000000">Anyone have any definite info on setting up this projection? If it's </FONT>
<FONT COLOR="#000000">normal, what do those large numbers really mean (if not meters)? Did </FONT>
<FONT COLOR="#000000">I miss a parameter?</FONT>
<FONT COLOR="#000000">-----</FONT>
<FONT COLOR="#000000">William Kyngesburye <<A HREF="mailto:kyngchaos@kyngchaos.com">kyngchaos@kyngchaos.com</A>></FONT>
<FONT COLOR="#000000"><A HREF="http://www.kyngchaos.com/">http://www.kyngchaos.com/</A></FONT>
<FONT COLOR="#000000">"History is an illusion caused by the passage of time, and time is an </FONT>
<FONT COLOR="#000000">illusion caused by the passage of history."</FONT>
<FONT COLOR="#000000">- Hitchhiker's Guide to the Galaxy</FONT>
<FONT COLOR="#000000">_______________________________________________</FONT>
<FONT COLOR="#000000">Proj mailing list</FONT>
<FONT COLOR="#000000"><A HREF="mailto:Proj@xserve.flids.com">Proj@xserve.flids.com</A></FONT>
<FONT COLOR="#000000"><A HREF="http://xserve.flids.com/mailman/listinfo/proj">http://xserve.flids.com/mailman/listinfo/proj</A></FONT>
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</BLOCKQUOTE>
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--
_____________________________________________________________
Jerry and the Low Riders: Daisy Mae and Joshua
"The most certain test by which we judge whether a country is
really free is the amount of security enjoyed by minorities"
---Lord Acton, 1907
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