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map_image edge distortion [message #63544]

Tue, 11 November 2008 17:11

mankoff
Messages: 131
Registered: March 2004

Senior Member

Hi Group,

I'm confused by few simple commands. I'm trying to produce a basic map
(for cutting up and putting into Google Maps). It needs to be mercator
projection, square, and some multiple of 256x256. I thought the
following code might do it:

data = randomu(foo,64,64)
window, 0, xsize=256,
ysize=256
map_set, 0, 0, /mercator, position=[0,0,1,1]
img = map_image( data, xx, yy, xs, ys, /compress )
img = bytscl( img )
tv, img, xx, yy, XSIZE=xs, YSIZE=ys
img = tvrd()
write_png, 'map.png', img, r,g,b

But the resulting PNG has sidebars for some reason. What am I doing
wrong?

Thanks,

-k.

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