[Proj] Oblique Cyl Eq Area
woklist at charter.net
Thu Jul 7 11:14:28 EDT 2005
Sorry to repeat, but I need to know if anyone has any ideas on this:
I want to set up a map with the Oblique Cylindrical Equal Area
projection (ocea). I couldn't find much info on parameters needed
and the effects of them. From what I found in the USGS projections
book I need two points for the oblique line (lat_1, _2, lon_1, _2).
Simple enough. Yet I get projected coordinates in the trillions!
It's not an easting/northing problem - I get +/- trillions around the
center of the projection.
this is what I used (Australia/SE Asia region):
proj +proj=ocea +ellps=sphere +lat_1=-45 +lat_2=22.5 +lon_1=180
(I tried ellps=WGS84 also)
Changing the distance between the oblique points seems to affect the
projection a bit - instead of at the limits of the area of interest,
if I make them say 1/10 of that apart, the coordinates go down by up
to a trillion.
Anyone have any definite info on setting up this projection? If it's
normal, what do those large numbers really mean (if not meters)? Did
I miss a parameter?
William Kyngesburye <kyngchaos at kyngchaos.com>
"History is an illusion caused by the passage of time, and time is an
illusion caused by the passage of history."
- Hitchhiker's Guide to the Galaxy
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