Forest of Soignes Project realized by Belgian Graphic Interface (BGI) for the Brussels Institute of Environment Management (IBGE)

Plan Context The GeoEngineering MicroStation Solution The work composition Results Conclusion What were the needs ? What were the available data ?

Context Environmental project BGI : a company offering products and services in the field of GIS/CAD technology designed by IBGE : local governmental for

Location

Needs The IBGE asked BGI to create a data set about the Forest of Soignes - geology - soil - ecology - alphanumeric database to realize a thematic map about : - the slopes ( > and < to 20 %) - their aspects (north and south)

From Environmental data on paper Geological maps on paper Soil maps on paper A raster copy of contour lines Data provider : Belgian National Geographical Institute (NGI)

The work 1To digitize or vectorize all the data available and especially to entry the elevation of the 3D data 2To clean, validate and create the polygons of the areas vectorized 4To create a DTM from the 3D data and to drape the 2D data 5To analyze the 3D data 3To register the new polygons with the data coming from the NGI

To accomplish this project we used the GeoEngineering MicroStation Environment MicroStation MicroStation Descartes MicroStation GeoGraphics Geopak GeoTerrain

Vectorisation with Descartes Soil map Geological maps

Vectorisation with Descartes

VECTORISATION MICROSTATION DESCARTES Georeferencing Vectorisation and elevation entry Color filters TOOLS TASKS

Cleanup DANGLESGAPS SIMILAR geologie.dgn

Cleanup geologie.dgn DANGLES SIMILAR

Cleanup geologie.dgn SIMILAR

Cleanup geologie.dgn

POLYGON GENERATION MICROSTATION GEOGRAPHICS Correction Validation and creation of polygons (over 101 vertices) Generation of areas with holes TOOLSTASKS

First results

Georefenrencing- Register

DTM generation Contour lines in DGN Front view

DTM generation TIN generated from the DGN 3D file

DTM generation Contour lines regenerated from the TIN

DTM GENERATION MICROSTATION GEOTERRAIN Creation of the DTM TOOLS TASKS Draping Isohypse & isohypse label generation

DTM generation Slope analysis Slopes < 20 % Slopes > 20 %

ANALYSIS MICROSTATION GEOTERRAIN TOOLS TASKS Analyse Programming for bi-criteria analyze

MicroStation Environment MicroStation Descartes MicroStation GeoGraphics Geopak GeoTerrain DATA WORKFLOW Photo draping, raster update Data acquisitionArea generation DTM creation Analyse

Results

Ecology Soil Geology Relief Soignes data set

N S 200 m 2 km Slopes < 20 % Slopes > 20 % and south aspect Slopes > 20 % and north aspect Forest of Soignes : Ecological areas

Conclusion The complete interoperability between these four applications allowed us to profit of the efficient tools of each working configuration. The customizable tools (MDL, MicroStation Basic and now JAVA) allowed us to exactly fulfil the client needs.

BGI : Bentley Systems : For more information : please contact