Hi Andrew -
What a coincidence this is! I have been struggling with QGIS for a
couple of weeks. It has a VERY steep learning curve. I am beginning to
think that our future as cave cartographers will include some kind of
GIS work. Some sort of tutorial would be very useful for complete GIS
newbies like me
I got your Survex plugin loaded. That was easy. It will open and view
a .3d file which is produced by Therion. QGIS shows centerline and
survey stations, but no walls. Nothing from LRUD. I suspect that
Therion does not create the same kind of file as Survex. Viewing the
file in Aven also does not show any kind of walls or passage polygons.
I have struggled to get some sort of DEM file. That is another learning
curve! I have a GeoTIFF file which covers several square miles around
the current cave project. The web site I got it from (USGS) would not
zoom in any further. I was able to add another layer which is the .shp
file from Therion's ESRI output. Also a .kml file. Neither the .shp
nor the .kml file is visible
This cave runs directly under the owner's house. We would very much
like to see some sort of 3D view which shows how the cave and surface
are related. I suspect there is only 20 feet or so between the house
and the cave. Not much! The owner has some ideas for renovation which
would reduce that, possibly to something that is not safe.
===============
Bill Gee
On 2/20/25 05:57, Andrew Atkinson wrote:
Hi all
Not strictly a Therion question, but the answer is likely to be in the
data entry or the interpretation of data in Therion.
I'm slowly incorporating QGIS into my workflow, and trying to automate it.
As such I'm using a modified version of the survex 3d importer
https://github.com/AndrewAkinson/qgis3-survex-import_amend
So that items can be easily switched on and off I'm going down the line
of importing the 3d files by cave rather than the generated one for the
whole catchment
For now I'm doing it with the data in
http://www.cave-registry.org.uk/svn/CheddarCatchment/
Currently I'm working on the Longwood Valley area as Longwood Valley
Sink has been recently discovered.
The directories I'm using
RRift/ (3d needs to be generated from survex)
LongwoodValleySink/
Longwood/ (Fake data with calibrate compass -90!)
Toothache/ (single leg)
In each of these directories the .th file generates a survex 3d file
Also in the the root there is a LongwoodValley.thcfg which has the above
caves (plus maybe Charterhouse, GB, TynningsGS and Reads depending on
how I left it)
In the diagram attached (hopefully this list does attachments!)
The Dark purple dots are the import of the 3d file that has Rhino,
Longwood, LongwoodValley Sink and Toothache together. The light pink,
yellow dots are the individual imports (and entrances from the MCRA
database.) Also included is an overlay of a scree shot from aven, which
agrees with the group import.
The question is why is Longwood different when imported as a 3d on its
own compared with as a group? They are both using the same data!
Andrew
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