[Therion] Cave Overlays on Google Maps Web Sites
s.m at group-s.sk
Tue Jan 30 15:19:39 CET 2007
Quoting Wolfgang Zillig <wolfgang.zillig at web.de>:
> 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.
I have forgotten, shapefiles are also already implemented in the last
developement snapshot (including user defined object attributes) ;)
export map|model -fmt esri
should create a directory with shapefiles for different shapes. If you
have georeferenced data, also associated .prj files are created.
Tested on free QGIS and ArcExplorer. I am just not able to display 3D
> But shapefile would be a nice link to the gis world!
> 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
>> 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
>> 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.
>> Therion mailing list
>> Therion at speleo.sk
More information about the Therion