contrib:terrainmodelling

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contrib:terrainmodelling [2010/12/20 01:19]
brucemutton
contrib:terrainmodelling [2013/09/05 10:39] (current)
brucemutton surface profile
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 [[http://therion.speleo.sk/wiki/doku.php?id=ifl#terraintool_seems_to_be_an_easier_alternative|Terrain Tool blurb]] [[http://therion.speleo.sk/wiki/doku.php?id=ifl#terraintool_seems_to_be_an_easier_alternative|Terrain Tool blurb]]
 +
 +====Surface Profiles====
 +To create surface profiles, you can string together a series of regularly spaced fixed surface points from, either a gps overland trail (lat long elev), a series of points manually extracted from Google Earth, or generated with the help of [[http://www.gpsvisualizer.com/elevation]]
 +
 +To use GPSVisualizer 
 +  - export a kml model of your cave (or a simplified representation) with therion
 +  - Upload the kml file to the online GPSVisualizer tool and request plain text output (it will replace the cave elevations with ground surface elevations)
 +  - copy-paste the data back into therion as fixed stations
 +  - join the fixed stations with nosurvey legs
 +
 +A hint at how to get all these fixed point into a form that looks like a survey centreline in therion...
 +   centreline 
 +   cs lat-long
 +   grade BCRA3
 +
 +   walls off 
 +   mark temporary   
 +   flags surface 
 +   # station-names 4wd01 [] # to avoid name clashes if required
 +
 +   fix 1 -42.0001724 171.9024155 572.6
 +   fix 2 -42.00020492 171.9022789 574.04
 +   fix 3 -42.00021414 171.9021513 574.04
 +   fix 4 -42.00026879 171.9020413 575.01
 +   fix 5 -42.00030752 171.901925 575.01
 +   #thousands of these, they are decimal degrees and metres
 +
 +   data nosurvey from to
 +   1 2
 +   2 3
 +   3 4
 +   4 5
 +   5 6
 +   6 7
 +   #thousands of these as well, a spreadsheet makes them easy to generate
 +
 +   endcentreline
 +
 +   #Then just select this survey along with your cave when processing
  • contrib/terrainmodelling.txt
  • Last modified: 7 years ago
  • by brucemutton