[Therion] Surface woes

[Wolfgang Zillig]

Bruce Mutton schrieb:
>
> 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
>
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Hi Bruce,

in the bitmap command is the problem! The "0 0" and "100 100" are in 
pixel coordinates! This means "0 0" is the lower left corner of the 
image. Usually I use lower left and the upper right corner. I suppose 
your image is bigger than 100x100 pixel.

Regards
Wolfgang