semper-ad-fundum / spiral-cave

Spiral cave, Samotorit massif, Montenegro

Spiral cave

Morphing

The surveys came with partial plans drawn between 2016 and 2019, partially by hand. At the same time parts of the surveys didn't have LRUD data. Therefore Therion morphing (sketch warping) was used to draw the new plan over the bitmap of the hand-drawn plan, embedded in Therion canvas.

1. Create a new empty canvas in the plan view
2. At the bottom of the menu in Background images add the original hand-drawn scan
3. Create a new scrap
4. In the scrap menu section Background sketches click the background sketch you just added
5. Add named survey stations where they are located on the hand-drawn scan
6. Run Therion to generate the XVI file

The generated XVI file will now have the rescaled and morphed bitmap embedded. You can then abandon the original sketches, and create a new one, this time using the morphed XVI as Background sketch and draw over it.

Terrain view

Terrain view is possible in both Aven and Loch models. NASADEM_HGT_N42E019.zip was downloaded from NASA DEM, placed in ~/.terraintool and unpacked there.

Aven requires the HGT file from the unpacked archive loaded through File > Open Terrain menu option.

Loch requires the terrain data to be compiled into the .lox file, which is done with the surveys/nasdem.th file generated by TerrainTool. In TerrainTool the following settings were used:

• Coordinate System: UTM
• Datum: WGS-84
• Ellipsoid: GRS80
• Therion cs name: UTM34

Then select Create menu and use the following options:

• Grid Reference: 34T 380713 4711095
• E-W Range: 600
• N-S Range: 600
• Spacing: 20
• Grid Ref at: Centre

NASA DEM download:

1. At https://earthexplorer.usgs.gov in Data Sets tab search for and select NASADEM_HGT
2. In the Search Criteria tab go to Polygon tab and click Use Map
3. Mark the Montenegro area on the map
4. Search displays only one result, NASADEM_HGT_N42E019.zip for download

Running TerrainTool under sway:

env _JAVA_AWT_WM_NONREPARENTING=1 java -jar TerrainTool.jar