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Using color table to map symbol colors in plot [message #94425]

Thu, 18 May 2017 18:26

laura.hike
Messages: 87
Registered: September 2013

Member

Hi,

I can't find a similar question from earlier, but feel free to point me to one instead of answering.

I am making a map and would like to overplot values at given locations. The values are at random positions, so I want to plot them as dots, not using a contour plot. (Maybe if I get desperate I'll try that.) I start with

m = map("geographic",limit = [-25,139.8,-9.9,155])
m1 = mapcontinents(/hires)

I have three sets of data, lats, lons, and some values in an array we'll call "values". I want to plot points at the locations of the lat, lon pairs with the colors based on values. So after using a loadct, I scale the values to 0-255 in "ivalues". What I want to do next is something like

p = plot(lons, lats, color = ivalues, linestyle = 'none', symbol = 'o', sym_filled = 1, /overplot)

but I get "PLOT: Invalid internal color." when I do. I can plot the data using one color value at a time, i.e.,

p1 = plot(lons[where(c eq 225)], lats[where(c eq 225)], color = 'yellow', linestyle = 'none', symbol = 'o', sym_filled = 1, /overplot)

but, even in that style, not with a numerical value corresponding to the color table, i.e., color = 255. Is there any way to do what I'm looking for? From what I can tell, all of the color properties used with "plot" (like "symbol_color" or just "color") only take the named palette of colors as shown on

https://www.harrisgeospatial.com/docs/formattingsymsandlines .html

Thanks for any assistance,

Laura

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[Message index]

		Using color table to map symbol colors in plot By: laura.hike on Thu, 18 May 2017 18:26
		Re: Using color table to map symbol colors in plot By: siumtesfai on Thu, 18 May 2017 18:34
		Re: Using color table to map symbol colors in plot By: Markus Schmassmann on Fri, 19 May 2017 02:59
		Re: Using color table to map symbol colors in plot By: laura.hike on Mon, 22 May 2017 15:12

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