Differences

This shows you the differences between two versions of the page.

--- contrib:terrainmodelling [2010/06/14 04:34] – add GDAL link brucemutton
+++ contrib:terrainmodelling [2013/09/05 10:39] (current) – surface profile brucemutton
@@ Line 5: / Line 5: @@
 ====TerrainTool====
-A simple java app that makes terrain models in less than a minute, designed for survex but with two more steps you can get data in therion format.
+A simple java app that makes terrain models in less than a minute, designed for use with survex and therion.
 [[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
+	2
+	3
+	4
+	5
+	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