My bad -- the source was getting updated, but apparently the image was being cached. I've changed it to point to a different image each time, now, and verified that it does indeed update every time a new image is generated. It actually checks once per minute by default, but the images are only generated once every two minutes at the moment.

There are two outstanding issues (at least):

1) Needs a non-lossy image format that has a better compression rate than a geoTiff. Right now the 3000x6000 images are about 2 to 4 MB each, depeding on the weather. I tried a png, which was only about 1 MB, but the areas that should have been transarent were solid black and vice-versa (using linux "convert").

2) It would be nice if there are an easy way to rapidly loop a series of images. Any idea if this will be supported in the future?

Thanks,

Travis