GEOINFO

Digitalization of the geological data preserved at the Geological Survey of Belgium (geological maps 110 to 236)

Description of the program

For several years, the computerisation (programs GEODOC and GEOINFO) of the data of the Belgian basement and the new geological cartography progress together. The second one differs between the Walloon Region and the Flemish Region according to their specific goals and aims but also related to geological specificity. The geological cover of the Flemish Region has just finished (at the end of 2002). The geological cartography of the Walloon Area implies a complete field prospecting and will require 15 years of efforts. The GSB is an agent of the data collected uninterrupted since its creation, more than one century ago. The data were initially on paper medium and include the descriptions of outcrop, section, pit, borehole, water data etc). The physical files relate to the samples collected on all the territory in the form of drilling core or cuttings (fragments of rocks collected at the time of drilling by destructive way).

All the descriptive (and interpretative) data (texts, diagram, section, logging of drillings) are gradually computerised and assembled in databases. The topographic map at 1/10.000 is the element of reference of cutting. A geological map at 1/40.000 corresponds to 2 (4 for the last edition) topographic charts at 1/10.000. The development of the geographical information systems (GIS) makes it possible to couple the descriptions of the observation points with their localisation on topographic maps and to carry out the requests on selected topics or delimited areas. Databases available (drillings, sandstone open pits, bibliography, geological maps etc) are added like as many consultable and crossable information layers within the GIS. The workspaces thus created will be consulted in Intranet then, in the long term and gradually, will be open to all in the library. A future development will consist in making the main data available on Internet.

Realization

By geological map:

  • The original paper outcrop maps (1/10.000 and 1/25.000) are scanned, corrected, geocoded and assembled. They are used as support to position the observation points and their transfer onto the topographic charts of IGN. The Lambert coordinates are calculated;
  • Construction of the links between the computerised texts of the outcrops (*.txt and *.FP5) and IGN topographic maps;
  • To build the links towards the specific Belgian geological bibliography (7 publications referred by G VANDENVEN) for each geological map
  • Links between the scanned figures (geological section, photographs, tectonic sketches, tables etc) and description;
  • To build more basic layers - vector and raster geocoded geological maps (1/40.000), aerial photographs, pits databases etc.

Delimitation of the zone covered by GEOINFO

Program GEOINFO progresses from the south towards north and is complementary with the work of geological cartography performed by the Walloon Region in partnership with RBINSc and the universities (ULg, UCL, ULB and FPMs).

 

Related media(s)
Progress report of GEOINFO in September 2003
Points of observation on a vectored geological map
Points of observation on a composite background
biblio
Other member(s)
G. Han
Funding
Financial support by Geological Survey of Belgium
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