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

1 To digitize or vectorize all the data available and especially to entry the elevation of the 3D data

2 To clean, validate and create the polygons of the areas vectorized

4 To create a DTM from the 3D data andto drape the 2D data

5 To analyze the 3D data

3 To 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 with Descartes

Vectorisation with Descartes

VECTORISATION

MICROSTATION DESCARTES

Georeferencing

Vectorisation and elevation entry

Color filters

TOOLS

TASKS

Cleanup

DANGLESGAPS

SIMILARgeologie.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

TOOLS

TASKS

First results

Georefenrencing- Register

Georefenrencing- Register

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 acquisition Area generation DTM creation Analyse

Results

Ecology

Soil

Geology

Relief

Soignes data set

N

S

200 m

2 km

Slopes < 20 %Slopes > 20 % and south aspectSlopes > 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 : www.bgi-sa.com

Bentley Systems : www.bentley.com

For more information : please contact