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tracing contours, how? [message #10730]

Thu, 22 January 1998 00:00

becker
Messages: 1
Registered: January 1998

Junior Member

Hi,

I am trying to trace a special contour line in a 2D field, t, to
get the coordinates in data units. I tried

CONTOUR, t, PATH_XY=xy, PATH_INFO=info, levels=contourlevels
k = 0
FOR i=0, (N_ELEMENTS(info) - 1 ) DO BEGIN
FOR j=0, info(i).n-1 DO BEGIN
IF((info(i).value EQ tracecontourvalue)THEN BEGIN
print, info(i).value, xy(0, k+j), xy(1, k+j)
ENDIF
ENDFOR
k = j
ENDFOR

and was hoping that this would trace the polygons and give me all points
in normalized units if the contourvalue is tracecontourlevel. I got the
right contour, but the points it printed didn't really make sense. Why?
Did anybody solve this problem with IDL? Your help is greatly appreciated.
Thanks in advance

Thorsten

Thorsten W. Becker________________________becker@fas.harvard.edu

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[Message index]

		tracing contours, how? By: becker on Thu, 22 January 1998 00:00
		Re: tracing contours, how? By: Armand J. L. Jongen on Fri, 23 January 1998 00:00
		Re: tracing contours, how? By: davidf on Thu, 22 January 1998 00:00

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