[Therion] Cave Overlays on Google Maps Web Sites

[Wolfgang Zillig]

Hi,

perhaps one alternative would be to implement shapefile support and to 
use gdarwarp and/or gdal_translate to create kml. But I don't have any 
experience with the kml format.

But shapefile would be a nice link to the gis world!

Greetings
Wolfgang

Stacho Mudrak schrieb:
> Quoting Bill Chadwick <W.CHADWICK at sky.com>:
>   
>> As this is quite a nice way of presenting cave surveys, perhaps a Google
>> tile generator would be a good add on for Therion. The advantage of building
>> the renderer into Therion would be that the overlay could be drawn
>> separately for each Google Zoom level to achieve a good line width and text
>> size.
>>     
>
> Hmmm. Just one problem. Therion it self does not have any build-in  
> bitmap generator. All maps are generated as vector PDF. And generation  
> of bitmaps from PDF is very tricky (currently only Acrobat reader is  
> able to render these PDF files 100% correct).
>
>   
>> I am well informed in the areas of coordinate systems and map projections
>> and able to program in C++. With some guidance I might be able to help with
>> the coding of such an extension.
>>     
>
> I have tried to generate Google Earth's KML files from therion and it  
> seems to work (scrap outlines for maps, centerline for model, try  
> latest developement snapshot). All you need is to have georeferenced  
> cave data (see "Coordinate Systems" in thbook). Then just
>
> export model -fmt kml
>
> will generate .kml file readable by Google Earth.
>
> If somebody will create a good rasterizer script for PDF files  
> generated by therion (using ghostscript or acroread), there is no  
> problem for us to add export of long-lat coordinates together with PDF  
> file to be used by this script.
>
> S.
>
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