[Proj] Oblique Cyl Eq Area
Gerald I. Evenden
gerald.evenden at verizon.net
Thu Jul 7 13:31:21 EDT 2005
First. "trillion" seems to have a ambiguous definition in Kdict so I am
not sure about
your what you mean here. Is it greater or lesser than a gazillion? :-)
sorry about my humor.
Secondly, I am not sure I am aware of the +ellps=sphere option. When I
try it on lproj
I get a segmentation fault which I am looking into at this moment. Note
ellipsoid name creates the same error.
One thing I will note is that I am more familiar with specifying the two
points in an west
to east orientation so that point 1 would be 22.5,90 and point 2
-45,180 so that I am
not sure that reversing the order will not generate unexpected results.
There is definitely one bug item here and you will hear more from me in
On Thu, 2005-07-07 at 10:14 -0500, William K wrote:
> 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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