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Re: Georeferencing Errors [message #41643 is a reply to message #41513]

Wed, 03 November 2004 12:19

will.mccarty
Messages: 2
Registered: November 2004

Junior Member

OK, after months of wondering why, I've finally figured out the
problem!

The double precision adjustment played a role, but not the main role.
I had this problem with lat/lon grids already in double precision
previously, and yet had the exact same georeferencing problems.

It all comes down to two simple parameters. I post this so when I
have the problem again in 6 months, I'll find the answer.

I had been declaring projection information using:

--
map_set,mean(lat),mean(lon),/cylindrical,limit=[min(lat),min (lon),max(lat),max(lon)],/noborder
--

However, this gives a default border around the image. map_patch,
however, assumes no border. Thus by declaring the projection as
having no border:

--
map_set,mean(lat),mean(lon),/cylindrical,limit=[min(lat),min (lon),max(lat),max(lon)],/noborder,xmargin=0,ymargin=0
--

The map_continents vector information and the map_patch result end up
lining up perfectly.

My thought process in why this happens may be flawed, but by setting
xmargin and ymargin to zero, it lines up.

Will

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[Message index]

		Georeferencing Errors By: will.mccarty on Tue, 02 November 2004 10:20
		Re: Georeferencing Errors By: Kelly Dean on Wed, 03 November 2004 21:21
		Re: Georeferencing Errors By: will.mccarty on Wed, 03 November 2004 12:19

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