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Re: overplotting contours on tvimage.... [message #94398 is a reply to message #94393]

Tue, 09 May 2017 04:44

Markus Schmassmann
Messages: 129
Registered: April 2016

Senior Member

On 05/08/2017 09:50 PM, M Q wrote:
> I'm trying to overplot contour lines on an image made with David Fanning's TVIMAGE command.
>
> I'm doing something like this:
>
>
> data=world() ;360x360 array, ranges from 0 to 254
> tvimage,data,position=[.5,.5,.6,.6] ; I need to do multiple plots
>
> contour,/overplot,data,levels =[ 100,150,200]
>
> No contours show up.
>
> I've thought about doing a congrid command something like this:
>
> data2 = congrid(data,x_panel_size, y_panel_size)
> contour,data2,/overplot,levels =[100,150,200]
>
> but I can't figure out how to get the size of the current plot, that is, the image I plotted at position= [.5,.5,.6,.6].
>
>
> Any suggestions would be welcome. I've been banging my head against the wall for a couple of days now.
Use

contour,data, path_info=info, path_xy=lines, /path_data_coord, $
levels=[100,150,200]
print, info, /implied
print, lines

to check, whether the contours are as you expect.

I'm not familiar with the tvimage command, but to properly align the
contours and the image, consider manually setting the window size then
using device coordinates to draw the contours.

xwsize=1200
ywsize=1200
imagePos=[.5,.5,.6,.6]
window, xs=xwsize, ys=ywsize
tvimage, data, position=imagePos

foreach ii,info do plots, $
imagePos[0]*xwsize +lines[0,ii.offset+lindgen(ii.n)]* $
((imagePos[2]-imagePos[0])/360*xwsize), $
imagePos[1]*ywsize +lines[1,ii.offset+lindgen(ii.n)]* $
((imagePos[3]-imagePos[1])/360*xwsize), $
/device

I hope this helps, Markus

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[Message index]

		overplotting contours on tvimage.... By: astroboy.20000 on Mon, 08 May 2017 12:50
		Re: overplotting contours on tvimage.... By: Nikola on Tue, 09 May 2017 04:40
		Re: overplotting contours on tvimage.... By: Markus Schmassmann on Tue, 09 May 2017 04:44

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