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GIS-Tellus 2.x – Geographic Information System
Overview Tellus is designed by "Graphic Software" and "Image-Processing Systems" Departments at TellusTech Ltd. and is licensed at the Patent and Trademark Office in Bulgaria under No. 51368. This technology has been developed on two levels - hardware and software. GIS-Tellus 2.x corresponds to the newest world standards and trends in the field of GIS/LIS and CAD. The System is developed using the big experience of more than 100 companies and organizations - members of TELLUS club, gained during the land reform in Bulgaria 1992 - 1997 with the means of Tellus 1.x. Tellus 2.x uses relational databases for storage of graphic information. Unspecified database can be used, for which there are ODBC or DAPI drivers, for example Oracle, Informix, Sybase, Paradox, Btrieve as the non-graphic information can be stored in database as well, which don't support long binary fields. Unspecified inquiries are kept in the databases through SQL. Tellus 2.x fulfils non - standard mixed SQL-graphic inquiries as well (sections, unions, belonging, neighboring, remoteness, mutual properties as area or perimeter).
Vast number of monochrome, halftone and True Color raster of image layers is kept (aero photos, satellite images and all sorts of digital data from the scanning). The raster images are transformed in real time to the selected co-ordinates.
The system comprises development and moulding language. The dialect of Lisp - Scheme of Texas Instruments is chosen. TellusScheme covers entirely the standards of the language. An interface is created for enlargement of the module system, written in high-level language and compiled to DLL.
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