Contour Plots

Plots of countour lines.

volcano.gle

volcano.glevolcano.gle volcano.zip zip file contains all files for this figure.

volcano.gle

 size 9 9

 begin contour
 data "volcano.z"
 values from 130 to 190 step 10
 end contour

 begin graph
 title "Auckland's Maunga Whau Volcano"
 data "volcano-cdata.dat"
 d1 line color black
 colormap "volcano.z" 100 100
 end graph

volcano.gle

volcano.glevolcano.gle volcano.zip zip file contains all files for this figure.

volcano.gle

 ! Example of contour plot with colorized lines.
 ! Author: Francois Tonneau

 size 20 13

 include contourplus.gle
 include palettes.gle

 set font ss

 begin contour
 data "volcano.z"
 values from 100 to 200 step 5
 end contour

 sub hue z
 local adjusted = (z - 100) / (200 - 100)
 return viridis(adjusted)
 end sub

 amove 3 2.5
 begin graph
 size 12 8.5
 fullsize
 subticks off
 x2ticks off
 y2ticks off
 axis grid color #c0c0c0
 labels color black hei 0.5
 set lwidth 0.03
 xaxis min 0 max 850 ! '850': see the top line of volcano.z
 yaxis min 0 max 600 ! '600': see the top line of volcano.z
 xtitle "Meters north" dist 0.6 hei 0.6
 ytitle "Meters west" dist 0.6 hei 0.6
 axis dticks 150
 begin layer 1500
 set lwidth 0.045
 draw contourlines "volcano" "hue"
 end layer
 end graph

 amove 16 8.5
 set hei 0.6
 write "Altitude (m):"
 begin key
 absolute 16 8 just tl nobox dist 0.4 hei 0.5
 for value = 100 to 200 step 20
 line color hue(value) lwidth 0.04 text num$(value)
 next value
 end key