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Re: [Therion] Cave Overlays on Google Maps Web Sites
From: |
Wolfgang Zillig |
Subject: |
Re: [Therion] Cave Overlays on Google Maps Web Sites |
Date: |
Tue, 30 Jan 2007 15:08:03 +0100 |
User-agent: |
Thunderbird 1.5.0.9 (Windows/20061207) |
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 <address@hidden>:
>
>> 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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