Cassanova, Bill wrote:
My question is how does this convert to pixel location FROM
the data set and then INTO the image.
Each pixel center is at a given lat-long in each image, but with
different projections, these are different. So you need to do:
pixel1 -> lat-long
lat-long -> meters_in_new_projection
meters_in_new_projection -> pixel2
This is going to take a bit of arithmetic.
However, a pixel in one image is not going to map exactly to one pixel
in the other -- so you need to do some type of interpolation. nearest
neighbor is easy, but not very pretty. Other methods are more complicated.
gdalwarp does all this for you, and does it well, so I'd either call out
to the command line program (easiest), or look at the gdalwarp source
code, and see if you can wrap it up in your app. No need to start from
scratch.
-Chris
--
Christopher Barker, Ph.D.
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