Have just had some partial success at adding a surface to my outputs.

I have cave data, georeferenced to the same co-ordinate system as that below, that covers at present 1km x 1km in plan, but I expect to add other systems to extend this area.

I have cropped a jpg topo map image to an area 3km x 3km

I am exporting at 1:1000 to pdf (900mmx1012mm)

I have labelled grids at 100m centres on the cave map, so I know from observing the output that the grids and the cave are correctly georeferenced.

Trouble is the jpg seems to be “zoomed in” many times too much.

My *.th data as follows;

survey…

surface #Canaan Road South Topo

   cs EPSG:27200 #NZ Map Grid 1949

   bitmap ./Surface/Canaan_South_Topo_NZMG_990210_020240.jpg \

     [0 0 2499000 6021000 100 100 2502000 6024000]

  grid-units meter

#  grid <origin x> <origin y> <x spacing> <y spacing> <x count> <y count>

#  grid-flip (none)/vertical/horizontal

#  [grid data]

endsurface

…

endsurvey

I have tried reducing the co-ords to the NE corner of the image, and seem to get a more legible, bur still erroneous, surface image.

Makes me suspect I’m exceeding some software limits and there’s an unreported error, or that I’m just making a dumb mistake.

A possibly related matter, I have had  “sketches on”  (no quote marks) in my layout since my first (almost) Therion steps last year, and not once have I had my jpg sketches exported to pdf.  I expect they should, and I recall that the samples provided seem to do so -  I could find no difference between my code and the samples.

Any ideas on these two issues? (surfaces most importantly)

Also the above code does not produce a 3D lox model.  Is that because a surface is either 2D or 3D but not both?

It would be nice to have at least a 2D image above my lox model until I can get a grillage of elevations sorted.

Regards

Bruce