Sunday, July 27, 2014

Irregular xyz data and GMT

After much tribulation (I will spare you the embarrassing details), I was finally able to install GMT on a macintosh and figure out the cryptic, yet powerful, GMT commands and options.

Mississippian tops gridded and displayed using open source GMT software. For well tops there are other tools, but for gridding general (x,y,z) data this is fabulous.

Might not seem like much, you could probably do it in Petra, Matlab, etc. But how about 1200 electrical conductivity values? No problem, but forget about posting the data values, just points this time.

About 1200 ground conductivity readings from an EM31 meter.  Negative values indicate metal objects in the near surface.  Conductivities between 5-20 mSm relate to areas with fresh groundwater.  High values (>30) probably represent shallow contamination by a conducting agent.

Here is the content of the raw text file miss.xyz, columns are (line, trace, depth)


101 70 2103
102 78 2130
101 64 2102
90 72 2103
91 64 2094
93 58 2107
78 70 2092
93 82 2088
66 82 2115
69 71 2106
69 60 2108
69 48 2138
36 21 2150
102 46 2160
66 21 2165
101 70 2103

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