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aardgoose / CaveView.js

Web native 3d cave survey viewer
https://aardgoose.github.io/CaveView.js/
MIT License
44 stars 11 forks source link

Cannot visualise .3d in EPSG:27700 #67

Closed aricooperdavis closed 3 months ago

aricooperdavis commented 5 months ago

I am trying to visualise a .3d file that uses a station fixed in EPSG:27700.

When I load it into CaveView I get the following console messages:

CaveView v2.7.3
Survex .3d version  v8
looking up CRS code EPSG: 27700
Reprojecting from +proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +nadgrids=OSTN15_NTv2_OSGBtoETRS.gsb +units=m +no_defs +type=crs to EPSG:3857
Unable to find mandatory grid 'OSTN15_NTv2_OSGBtoETRS.gsb'

This results in pop-up alert():

Failed loading cave information: TypeError: point is undefined.
aricooperdavis commented 5 months ago

This is probably a limitation in using proj4js with grid based datums like EPSG:27700?

aardgoose commented 3 months ago

Ari, Forgot to say, the latest version should work, it will be happy if adjustment grids aren't available now (positions will be slightly shifted but locations are correct within a few metres without the UK grid file in any case. If you do want to use grid files, they should be placed in the same directory as the survey file(s).