initial upload

cookbook/tesslayers/makelayers.py

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+import numpy as np
+import fatiando as ft
+
+shape = (41, 41)
+x, y = ft.grd.regular((-10, 10, 30, 50), shape)
+height = 800 - 1000*ft.utils.gaussian2d(x, y, 3, 1, x0=0, y0=37)
+rel = -7000*ft.utils.gaussian2d(x, y, 3, 5, x0=0, y0=40)
+thick = height - rel
+dens = 1900*np.ones_like(thick)
+data = np.transpose([x, y, height, thick, dens])
+with open('layers.txt', 'w') as f:
+    f.write("# Synthetic layer model of sediments and topography\n")
+    f.write("# Columns are:\n")
+    f.write("#   lon   lat   height   thickness   density\n")
+    np.savetxt(f, data, fmt='%g')
+ft.vis.figure(figsize=(4, 3))
+ft.vis.title('Depth of sediments [m]')
+ft.vis.axis('scaled')
+ft.vis.pcolor(x, y, rel, shape)
+ft.vis.colorbar()
+ft.vis.savefig('depth.png')
+ft.vis.figure(figsize=(4, 3))
+ft.vis.title('Topography [m]')
+ft.vis.axis('scaled')
+ft.vis.pcolor(x, y, height, shape)
+ft.vis.colorbar()
+ft.vis.savefig('topography.png')
+ft.vis.figure(figsize=(4, 3))
+ft.vis.title('Thickness of sediment layer [m]')
+ft.vis.axis('scaled')
+ft.vis.pcolor(x, y, thick, shape)
+ft.vis.colorbar()
+ft.vis.savefig('thickness.png')
+ft.vis.show()

cookbook/tesslayers/plot.py

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+"""
+Plot the columns of the output files
+"""
+import sys
+import pylab
+
+data = pylab.loadtxt(sys.argv[1], unpack=True)
+shape = (int(sys.argv[2]), int(sys.argv[3]))
+lon = pylab.reshape(data[0], shape)
+lat = pylab.reshape(data[1], shape)
+for i, value in enumerate(data[3:]):
+    value = pylab.reshape(value, shape)
+    pylab.figure(figsize=(4, 3))
+    pylab.axis('scaled')
+    pylab.title("Column %d" % (i + 4))
+    pylab.pcolor(lon, lat, value)
+    pylab.colorbar()
+    pylab.xlim(lon.min(), lon.max())
+    pylab.ylim(lat.min(), lat.max())
+    pylab.savefig('column%d.png' % (i + 4))

cookbook/tesslayers/tesslayers.bat

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+
+
+:: Convert the layer grids in layers.txt to tesseroids.
+:: The grid spacing passed to -s is used as the size of the tesseroids,
+:: so be careful!
+tesslayers.exe -s0.5/0.5 -v < layers.txt > tessmodel.txt
+
+:: Now calculate the gz and tensor effect of this model at 100km height
+tessgrd -r-8/8/32/48 -b50/50 -z100000 | ^
+tessgz tessmodel.txt | ^
+tessgxx tessmodel.txt | tessgxy tessmodel.txt | ^
+tessgxz tessmodel.txt | tessgyy tessmodel.txt | ^
+tessgyz tessmodel.txt | tessgzz tessmodel.txt -v > output.txt

cookbook/tesslayers/tesslayers.sh

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+#!/bin/bash
+
+# Convert the layer grids in layers.txt to tesseroids.
+# The grid spacing passed to -s is used as the size of the tesseroids,
+# so be careful!
+tesslayers -s0.5/0.5 -v < layers.txt > tessmodel.txt
+
+# Now calculate the gz and tensor effect of this model at 100km height
+tessgrd -r-8/8/32/48 -b50/50 -z100000 | \
+tessgz tessmodel.txt | \
+tessgxx tessmodel.txt | tessgxy tessmodel.txt | \
+tessgxz tessmodel.txt | tessgyy tessmodel.txt | \
+tessgyz tessmodel.txt | tessgzz tessmodel.txt -v > output.txt