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Re: Map transparent image [message #35684 is a reply to message #35683]

Tue, 01 July 2003 07:46

Andy Loughe ( remove is currently offline

Andy Loughe ( remove
Messages: 3
Registered: July 2003

Junior Member

Can this be accomplished by...

(1) preparing the image to be created, like via map_set.
(2) using polyfill or another technique to draw the (lightly colored) mask.
(3) "overplotting" with the data values included, then adding
continents, grids, etc.

... or maybe your needs are more complex than this.

Haje Korth wrote:
> Good morning everyone,
> I am trying to overlay a grey-shaded mask over an image to indicate areas
> where sample data are less reliable. However, I want the grey shaded area to
> be transparent so that I can still see the underlying data points. I do not
> want to use 'contour' since the results look rather confusing; too many
> patches. As far as I can see, the IDL map_image command does not provide
> such settings. Does anyone know, how the mask can be worked into the image
> prior to display? What is the math that one would apply?
>
> Thanks for helping,
> Haje
>
>

--
Andrew Loughe =====================================================
NOAA/OAR/FSL/AD R/FS5 | email: Andrew.Loughe@noaa.gov
325 Broadway | wwweb: www-ad.fsl.noaa.gov/users/loughe
Boulder, CO 80305-3328 | phone: 303-497-6211 fax: 303-497-6301

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[Message index]

		Re: Map transparent image By: Haje Korth on Tue, 01 July 2003 12:50
		Re: Map transparent image By: Haje Korth on Tue, 01 July 2003 12:49
		Re: Map transparent image By: Haje Korth on Tue, 01 July 2003 12:43
		Re: Map transparent image By: David Fanning on Tue, 01 July 2003 12:51
		Re: Map transparent image By: mmiller3 on Tue, 01 July 2003 12:22
		Re: Map transparent image By: Andy Loughe ( remove on Tue, 01 July 2003 07:46
		Re: Map transparent image By: David Fanning on Tue, 01 July 2003 11:12
		Re: Map transparent image By: Haje Korth on Tue, 01 July 2003 10:45
		Re: Map transparent image By: David Fanning on Tue, 01 July 2003 08:26
		Re: Map transparent image By: Haje Korth on Tue, 01 July 2003 08:04
		Re: Map transparent image By: David Fanning on Tue, 01 July 2003 06:24

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