| Mind Boggling Problem with Map_Proj_Init [message #72717] |
Fri, 01 October 2010 09:48 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Folks,
A couple of weeks ago I suspected an evil spirit had
been set loose in the world to infect a colleague's
computer. The long and short of it is this: Some of my
map routines, which *always* work, were failing on
her machine. She couldn't run any of my mapping
software!
Basically, any time she tried to put continental
boundaries on top of an image, MAP_CONTINENTS
reported "Map transform not established". Say
what!? I *was* establishing a friggin' map
transform with Map_Proj_Init in the line of
code just BEFORE this line! So what gives here?
mapStruct = Map_Proj_Init(...)
Map_Continents, MAP_STRUCTURE=mapStruct, ...
After several hours of putting great bald patches
on my head by scratching the hair out, I finally
discovered the problem. And then today the problem
re-appears in the form of an e-mail from someone
else. The unexplained convergence has prompted me
to send a note to other unwitting souls who may
find themselves in similar straights.
Bottom line. Don't use the *old* Map_Continents
routine you may have gotten from the rotten
bastard who ran off with the department secretary
to Tahiti. Or maybe, as today, you found in a
copy of the ESRG IDL library you installed on
your machine way back in 1986.
Use a more modern one. Say, the one that came with
your current IDL distribution. Things will go a LOT
better for you. :-)
You can find out which Map_Continents you are using
by typing one or the other (or all!) of these IDL
commands:
IDL> Print, File_Which('map_continents.pro')
IDL> .compile map_continents
IDL> Help, /Source
It should be the one that lives in an IDL lib directory!
C:\Program Files\ITT\IDL\IDL80\lib\map_continents.pro
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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