On Jan 26, 10:22 pm, Bill Chadwick <[email protected]>
wrote:

> HTML canvas for example does not appear to permit pixel manipulation of cross 
> site images.

True unless you can legally proxy the OS tiles on your own server.

Unfortunately, getImageData & putImageData are very slow in CANVAS.
Each 32-bit DWORD is (unpacked / packed) (to / from) four 32-bit
DWORDS.  The ordering must accommodate "little endian" or "big endian"
processors.

Are you composing each Mercator tile out of four UTM tiles ?  Square
tiles will warp to trapazoids.

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