| Re: Overlay contours on JPEG [message #43349] |
Fri, 08 April 2005 05:53 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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vinesh gautam writes:
> I am the fresher level student of M.Tech of IDL. I am doing some
> project related with Metreology. I have a JPEG image showing map of
> country. I know the Min. LAT,Max. LAT,Min. LOG, Max. LOG cornors of
> that image. I have a file which have three fields
> LAT LONG Temp. Value
> --- ------ ------
>
> Now the problem is that i want to draw the contours of Temp. Value on
> the image using this TXT file. Please advise me. I will be very
> thankfull to him. Because it is so necessary for my Studies.
Here is an article describing the basics of contouring this
kind of data on a map projection.
http://www.dfanning.com/tips/mapcontourdata.html
What you will want to do is add your image to the map
projection (using MAP_IMAGE, for example) right before
the CONTOUR command. Here is an article that describes
how to overlay a 24-bit JPEG image onto a map projection.
http://www.dfanning.com/tips/map_image24.html
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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| Re: Overlay contours on JPEG [message #43352 is a reply to message #43349] |
Fri, 08 April 2005 05:16  |
Haje Korth
Messages: 651
Registered: May 1997
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Senior Member |
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Vinesh,
you should be able to use the map* functions (map_set, map_image, ...) on
your image, which you can then TV to the screen and use CONTOUR to plot the
temperature contours. Check the online help for precise usa of the routines,
but it should all fall nicely in place.
Haje
"vinesh gautam" <vineshgautam@gmail.com> wrote in message
news:f243c15.0504080157.615f6516@posting.google.com...
> Hi to all,
> I am the fresher level student of M.Tech of IDL. I am doing some
> project related with Metreology. I have a JPEG image showing map of
> country. I know the Min. LAT,Max. LAT,Min. LOG, Max. LOG cornors of
> that image. I have a file which have three fields
> LAT LONG Temp. Value
> --- ------ ------
>
> Now the problem is that i want to draw the contours of Temp. Value on
> the image using this TXT file. Please advise me. I will be very
> thankfull to him. Because it is so necessary for my Studies.
> Thanks in advance.
>
> Vinesh Gautam
> M.Tech(IT)
> RU, New Delhi.
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