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Digital terrain model

The digital terrain model (DTM) is a homogeneous and regular point grid indicating the elevation of the ground level in order to make a model of its surface. The 1m DTM is obtained by interpolation in Lambert 2008 of the raw height data regrouping the source data, in Lambert 72 and at 1m resolution, of the Flemish and Walloon regions. The 5m DTM has as an additional source structure lines and adapted points, during the systematic and continuous updating by photogrammetric surveys. The 20m DTM, available for free download, is obtained by resampling the 1m DTM.

Simple

Date (Publication)
2007-01-01
Date (Revision)
2022-04-15
Identifier
BE.NGI-IGN / 5B217883-3BE6-4626-9B3B-2C1AD391DCA0
Purpose
The National Geographic Intitute uses the DTM primarily as a reference surface for applications at the scale of 1:10 000. It is also used for the internal production of orthophotographs. As a product, it is destined for customers who need a terrain model, wherever in Belgium, with a resolution of 1:10 000 at scale level. As an interpolation of the ground surface, the DTM has a heterogeneous accuracy, which can decline, especially in areas where few or no altimetric data are available.
Status
Completed
Custodian
  National Geographic Institute
Kortenberglaan 115 , Brussels , 1000 , Belgium
http://www.ngi.be
Maintenance and update frequency
As needed
Data.gov.be themes
  • Science and technology
Belgian Federal Thesaurus
  • Reporting INSPIRE
  • Federal Atom
  • Geology and physical relief
Spatial scope
  • National
GEMET - INSPIRE themes, version 1.0
  • Elevation
GEMET - Concept themes, version 4.01
  • relief (land)
  • altitude
  • federal government
  • digital land model
INSPIRE feature concept dictionary
  • Elevation Grid Coverage
Use limitation
•The custodian of the resource holds the rights of property (including the rights of intellectual property) to the geographic files •The custodian grants the user the right to use the data for his internal use. •Commercial use of the data under any form is strictly forbidden •Custodian’s name must be mentioned each time the data are being used publically.
Access constraints
Other restrictions
Other constraints
No limitations on public access
Use constraints
Other restrictions
Other constraints
•The custodian of the resource holds the rights of property (including the rights of intellectual property) to the geographic files •The custodian grants the user the right to use the data for his internal use. •Commercial use of the data under any form is strictly forbidden •Custodian’s name must be mentioned each time the data are being used publically.
Spatial representation type
Grid
Distance
20  m
Distance
5  m
Distance
1  m
Metadata language
Nederlands; Vlaams
Character set
8859 Part 15
Topic category
  • Elevation
Description
Belgium
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Unique resource identifier
EPSG:3812
Codespace
EPSG
Unique resource identifier
EPSG:5710
Codespace
EPSG

Spatial representation info

No information provided.
Distribution format
  • TIFF ( )

  • Esri Geodatabase ()

OnLine resource
https://ac.ngi.be/remoteclient-open/GeoBePartners-open/ATOM/6657e6da-7345-416f-bef6-c6a8b2def9bd-en.xml ( ATOM )
OnLine resource
Downloadable data ( WWW:DOWNLOAD-1.0-http--download )

Downloadable data

OnLine resource
View service ( OGC:WMS )

View service

OnLine resource
https://www.ngi.be/website/aanbod/digitale-geodata/digitaal-terrein-model/ ( WWW:LINK-1.0-http--link )

Direct access to the webshop

Hierarchy level
Dataset
Dataset
DTM

Domain consistency

Name of measure
INSPIRE Conformity

Conformance result

Date (Publication)
2010-12-08
Explanation
The dataset described fills the technical requirements sustaining the interoperability of data sets and services, as stipulated in the Commission Regulation (EU) No 1089/2010 of 23 November 2010
Pass
Yes
Statement

The product 'DTM', gives the height of the ground level in relation to the Belgian zero level (fictitious zero D of Uccle). It is therefore the orthometric height, commonly called: altitude.

The source data used for the production of this DTM are the 1m resolution DTMs of the regions: those of the AIV (ex-AGIV), for the Flemish region, and those of the SPW, for the Walloon region.

The two regional organisations providing their product in Lambert 72, the IGN reprojected the data into Lambert 2008 and carried out an interpolation in order to obtain a product with round coordinates and then assembled them so that the DTM product thus created covers the entire Belgian territory.

These source data are collected and processed to obtain a homogeneous and regular grid with every 1m, in X and Y, a point that indicates the height of the ground level. This grid forms the DTM 1m product, i.e. the DTM at 1 metre resolution. This product is directly derived from regional data and is not updated.

The 1m DTM is resampled by bilinear interpolation to obtain the same type of grid at 5m resolution. This is also improved and updated in-house via direct photogrammetric surveys of points and lines of structures based on the most recent aerial photography to produce the 5m DTM product. The DTM 5m is based on a compilation of the best available data, which is continuously updated and improved.

The 20m DTM product is then obtained by resampling the 1m DTM by bilinear interpolation to obtain a grid with a resolution of 20m.

Description
Each time new source data become available, they are incorporated into the existing source data and checked. On the basis of these new source data, a new version of the DTM is derived.
Description
The different sources which have been used are: image correlation, direct photogrammetric measurement of points and structure lines on the basis of aerial photographs, airborne laser scanning (points), field surveys (points), sometimes completed with linear structures, digitalized, updated and sometimes completed with structure lines.
File identifier
6657e6da-7345-416f-bef6-c6a8b2def9bd XML
Metadata language
English
Character set
UTF8
Hierarchy level
Dataset
Date stamp
2022-11-28T17:11:01
Metadata standard name
ISO 19115:2003/19139
Metadata standard version
1.0
Point of contact
  National Geographic Institute - Gaël Kruwialis
Kortenberglaan 115 , Brussels , 1000 , Belgium
http://www.ngi.be
 
 

Overviews

overview

Spatial extent

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Keywords

Belgian Federal Thesaurus
Federal Atom Geology and physical relief Reporting INSPIRE
Data.gov.be themes
Science and technology
GEMET - Concept themes, version 4.01
altitude digital land model federal government relief (land)
GEMET - INSPIRE themes, version 1.0
Elevation
INSPIRE feature concept dictionary
Elevation Grid Coverage
Spatial scope
National

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