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Re: MAP_SET vs MAP_PROJ_* [message #42459 is a reply to message #41671]

Wed, 09 February 2005 21:15

Gadhavi
Messages: 5
Registered: February 2005

Junior Member

Ben Tupper wrote:
> Gadhavi wrote:
>> Dear Friends,
>> I tried to run the program given by Ben that is mapTest. I
found
>> that map_continent and map_grid subroutines are not accepting the
>> keyword map_structure. I am using IDL 5.6. The subroutine shown by
Ben
>> is very useful for my purpose. Any suggestion to overcome this
problem
>> Thanking you
>
> Hi ,
>
> Those routines did not accept the MAP_STRUCTURE until IDL 6.1. Your
alternative
> is to set all of the paramters with the tradtional MAP_SET procedure.
>
> Ben

Thank you Ben
I have IDL version 5.6. I have to use GCTP routine which are available
through only MAP_PROJ_INIT function. I also tried to modify !MAP system
variable by assigning it to the results returned by MAP_PROJ_INIT
function but I could not get the work done. Let me tell more details
about the work I want to do. I have MODIS satellite data for land
reflectance. Which are available on the grid of size 1200 x 1200 on
Integerized Sinusoidal projection. Latitudes and Longitudes for four
corner points are also given. I can create the image of the size say
400 x 400 from given data using rebin. This image I want to project
over map with political bounderies and rivers. First of all Integerized
sinusoidal projection is not available in MAP_SET. So I have to use
MAP_PROJ_INIT function. It appears to me that this function do not
accept keyword "limit" with 8 elements giving 4 corner latitudes and
longitudes. Rather it accepts limit keyword with diagonal values of
latitude and longitude. This may not be correct for my problem as given
image is not rectangular in terms of latitude and longitude. This is
one part of my problem. Another problem is that I want to extract the
data values for station with known latitude and longitude. For that
purpose I want to calculate nearest index number to that station. I
will highly appreciate the help in this regard
Thanking you
HG

HG

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[Message index]

		MAP_SET vs MAP_PROJ_* By: KM on Wed, 10 November 2004 08:09
		Re: MAP_SET vs MAP_PROJ_* By: Gadhavi on Wed, 09 February 2005 21:15
		Re: MAP_SET vs MAP_PROJ_* By: Gadhavi on Wed, 16 February 2005 08:02
		Re: MAP_SET vs MAP_PROJ_* By: btt on Tue, 08 February 2005 10:01
		Re: MAP_SET vs MAP_PROJ_* By: KM on Wed, 16 February 2005 14:15
		Re: MAP_SET vs MAP_PROJ_* By: savoie on Thu, 17 February 2005 10:18

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