therion 6.1.6 (2023-01-11)
  - using Proj 9.1.1, compiled against 9.1.1
initialization file: C:\Program Files (x86)\Therion/therion.ini
reading ... done
configuration file: thconfig
reading ... done
reading source files ... done
preprocessing database ... done
output coordinate system: OSGB:SD
meridian convergence (deg): 0.4116
geomag declinations (deg):
  2024.1.1  -0.2856
  2025.1.1  -0.0709
scanning centreline tree ... done
searching for centerline loops ... done
calculating station coordinates ... done
processing survey data ... 
####################### cavern log file ########################
 1> Survex 1.2.44
 2> Copyright ¸ 1990-2021 Olly Betts
 3> 
 4> Survey contains 9 survey stations, joined by 8 legs.
 5> There are 0 loops.
 6> Total length of survey legs =   13.27m (  13.27m adjusted)
 7> Total plan length of survey legs =   11.54m
 8> Total vertical length of survey legs =    5.94m
 9> Vertical range = 5.47m (from 3 at 369.31m to 9 at 363.83m)
10> North-South range = 0.80m (from 7 at 78145.72m to 3 at 78144.92m)
11> East-West range = 11.41m (from 2 at 67020.00m to 9 at 67008.59m)
12>    2 1-nodes.
13>    7 2-nodes.
14> 
######################### transcription ########################
 4> 9 : 1.7@HITWGNSS -- 8 : 1.6@HITWGNSS
 9> 3 : 1.1@HITWGNSS -- 9 : 1.7@HITWGNSS
10> 7 : 1.5@HITWGNSS -- 3 : 1.1@HITWGNSS
11> 2 : -@HITWGNSS -- 9 : 1.7@HITWGNSS
12> 2 : -@HITWGNSS
13> 7 : 1.5@HITWGNSS
#################### end of cavern log file ####################
done
calculating basic statistics ... done
processing extended elevation ... done
processing references ... done
selecting export objects ... done
processing projection plan ... done
average distortion: 0.11%
writing Output/HITWGNSS.kml ... done
writing xtherion file ... done
compilation time: 0 sec


###################### scrap distortions #######################
 PROJECTION: plan
 AVERAGE  MAXIMAL  SCRAP
   0.11%    0.44%  HITWGNSSSP1@HITWGNSS
################### end of scrap distortions ###################

############# CRS transformations chosen by PROJ ###############
  Area of Use (AoU): (-2.507, 54.198) (-2.507, 54.198)
  [OSGB:SD → LONG-LAT] AoU: [yes] transformation: [Inverse of unknown + OSGB36 to WGS 84 (9) + axis order change (2D)] definition: [proj=pipeline step inv proj=tmerc lat_0=49 lon_0=-2 k=0.9996012717 x_0=100000 y_0=-500000 ellps=airy step proj=hgridshift grids=uk_os_OSTN15_NTv2_OSGBtoETRS.tif step proj=unitconvert xy_in=rad xy_out=deg] accuracy: [1.000 m]
  [OSGB:SD → LAT-LONG] AoU: [no] transformation: [Inverse of unknown + OSGB36 to WGS 84 (9) + axis order change (2D)] definition: [proj=pipeline step inv proj=tmerc lat_0=49 lon_0=-2 k=0.9996012717 x_0=100000 y_0=-500000 ellps=airy step proj=hgridshift grids=uk_os_OSTN15_NTv2_OSGBtoETRS.tif step proj=unitconvert xy_in=rad xy_out=deg] accuracy: [1.000 m]
  [OSGB:SD → OSGB:SD] AoU: [yes] transformation: [Inverse of unknown + unknown] definition: [proj=noop ellps=GRS80] accuracy: [0.000 m]
  [OSGB:SD → EPSG:4326] AoU: [yes] transformation: [Inverse of unknown + OSGB36 to WGS 84 (9) + axis order change (2D)] definition: [proj=pipeline step inv proj=tmerc lat_0=49 lon_0=-2 k=0.9996012717 x_0=100000 y_0=-500000 ellps=airy step proj=hgridshift grids=uk_os_OSTN15_NTv2_OSGBtoETRS.tif step proj=unitconvert xy_in=rad xy_out=deg] accuracy: [1.000 m]
  [EPSG:4326 → OSGB:SD] AoU: [yes] transformation: [axis order change (2D) + Inverse of OSGB36 to WGS 84 (9) + unknown] definition: [proj=pipeline step proj=unitconvert xy_in=deg xy_out=rad step inv proj=hgridshift grids=uk_os_OSTN15_NTv2_OSGBtoETRS.tif step proj=tmerc lat_0=49 lon_0=-2 k=0.9996012717 x_0=100000 y_0=-500000 ellps=airy] accuracy: [1.000 m]
########## end of CRS transformations chosen by PROJ ###########