Can't Find Map Interior

[mrmunion]

Or, so it says. I have a problem that appears under the following circumstances:

I have chosen a Lambert Azimuthal Equal-Area projection. I load in a .tiff database, and I set the projection center at 0º, 20ºE. I want to see just one hemisphere, so I set the boundaries to a small circle, with the boundaries defined relative to the projection center, at 0º, 0º, with a 90º radius. It draws the map, and everything looks just great.

Problem: when I then go to change the map size & resolution, I get an error if I set the map much larger than the default. I can size it up a bit, but if I try to get it to, say, 7" x 7" at 72 dpi, I get the error "IRangeMapError: Can't find map interior." This seems to only come up when the size (in pixels) becomes too large. 6" x 6" at 72 dpi is fine, but if I raise the resolution, the error comes up again.

If I turn off the boundary clipping, it works fine. I've tried turning it off, making the map larger, and then turning it on again, with no luck. I've also tried changing the projection center a couple of times. No luck. If I change the boundary to a radius of, say, 87º, it's fine, or 90.1º is also fine. But 90º is right out.

Any thoughts as to what's going on? I can make do fine enough with a number very close to 90º in the meanwhile.

[daan]

Hello, mrmunion. Welcome.

Apologies for the trouble. I see that it is quite insistent that it does not want to find the map interior when using the hemispheric boundaries. I have run into trouble of this sort on occasion, but usually I have been able to work around it easily by jiggling a projection parameter just slightly. This case is less tractable.

I did find I could image the map at 300dpi with a small circle radius of 90.05°. If that works for you, then let’s call it good and meanwhile I’ll try to track down the source of the problem.

— daan

[mrmunion]

Thanks, daan. No worries about the trouble. I know, from a small amount of coding experience, how intractable bugs can sometimes be. Happy to share more information if you would find it useful in debugging!

(P.S. I should have chosen a more recognizable username. This is Daniel Huffman.)