[Therion] Calibrating surface map

[Bruce Mutton]

Audrey

I just compiled an old project surface with a 50MB jpg without problem, so file size is not your issue.

Using a recent therion 6.2.0+fd5c1b6 (2024-01-10)



In the image you can see what happens when the image does not cover the full surface grid.

I’ve not looked at your numbers, but from your description perhaps the image position falls outside of your grid, and so you get something that looks like the left side of my image?

Maybe your grid needs a grid-flip none/vertical/horizontal?

I think the surface object needs to be inside a survey object, at least my one is.

 

Bruce

 

From: Therion <therion-bounces at speleo.sk> On Behalf Of Andrey via Therion
Sent: Saturday, 13 January 2024 10:48
To: List for Therion users <therion at speleo.sk>
Cc: Andrey <drunews at mail.ru>
Subject: [Therion] Calibrating surface map

 

Dear Therion users,

 

I am struggling to make a 3D model with terrain overlaid by a raster map.

 

Everything is done according to the Thbook however  Loch is only showing me a semi-transparent grid without any map overlay.   

 

Here is what I put into my Surface.th file:

 

  _____  

surface

cs epsg:32637 #UTM zone 37N Datum WGS84

 

bitmap Khipsta_DEM_utm.jpg [0 0 634154.048728 4787812.294106 13345 10428 642161.048728 4794069.094106] # 0 0 - SW corner

 

grid-units meter

grid 634148.414 4787799.503 10 10 803 628  # x lower leftt, y lower left SW

1088.598 1088.548 1088.4978 1088.4384 1088.3688 1089.3929 1090.4301 1091.0236 1089.8979 1088.7723 1087.3954 1085.6592 1083.9077 1080.9875 1077.3958 1073.8142 1065.2386 1055.7455 1046.4127 1039.4907 1032.5994 1025.662 1018.52 1011.3781 1004.0082 996.3887 988.7744 982.0675 975.7867 969…….

--------------------------------------------------------------------------------------------------------------------------------------------------------------

 

The corner point coords for the image:

  File "Khipsta_DEM_utm.jpg"

  Type "RASTER"

  (634154.048728, 4794069.094106) (0, 0) Label "NW",

  (634154.048728, 4787812.294106) (0, 10428) Label "SW",

  (642161.048728, 4794069.094106) (13345, 0) Label "NE",

  (642161.048728, 4787812.294106) (13345, 10428) Label "SE"

  CoordSys Earth Projection 8, 104, "m", 39, 0, 0.9996, 500000, 0

  Units "m"

 

If I comment ‘bitmap’ line the .lox file will be a lot smaller and vice versa if uncommented so I assume that overlay is being written into .lox

 

Could this be due to the .jpg file size which is 10.5Mb?  

 

I was able to make 3D models with terrain overlay in the past but image size was under 10Mb.

 

Many thanks,

Andrey

 

 

 

 

 

--
Kind regards,
Andrey

 

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