Canadian Digital Surface Model, 2000

This is a legacy product that is no longer supported. It may not meet current government standards.

The Canadian Digital Surface Model (CDSM) is part of Natural Resources Canada's altimetry system designed to better meet the users' needs for elevation data and products. The 0.75-second (~20 m) CDSM consists of a derived product from the original 1-second (30 m) Shuttle Radar Topographic Mission (SRTM) digital surface model (DSM). In these data, the elevations are captured at the top of buildings, trees, structures, and other objects rather than at ground level.

A CDSM mosaic can be obtained for a pre-defined or user-defined extent. The coverage and resolution of a mosaic varies according to the extent of the requested area.

Derived products such as slope, shaded relief and colour shaded relief maps can also be generated on demand by using the Geospatial-Data Extraction tool. Data can then be saved in many formats.

The pre-packaged GeoTiff datasets are based on the National Topographic System of Canada (NTS) at the 1:50 000 scale; the NTS index file is available in the Resources section in many formats.

Date ( RI_366 ): 2012-11-06

Date ( RI_367 ): 2015

RI_414

Government of Canada; Natural Resources Canada;Strategic Policy and Innovation Sector

Presentation form: modelDigital; modèleNumérique RI_393

Status: historicalArchive; archiveHistorique RI_594

Maintenance and update frequency: notPlanned; nonPlanifié RI_542

Update scope: dataset; jeuDonnées RI_622

Keywords ( RI_525 )

Canada

Keywords ( RI_524 )

Earth Sciences
elevation
relief
geomatics

Keywords ( RI_529 )

GeoBase
CDSM
DEM

Government of Canada Core Subject Thesaurus Thésaurus des sujets de base du gouvernement du Canada ( RI_528 )

Geographic information systems
Geomatics
Earth sciences
Cartography
Geography
Geographic data
Topography

Use limitation: Open Government Licence - Canada (http://open.canada.ca/en/open-government-licence-canada)

Access constraints: license; licence RI_606

Use constraints: license; licence RI_606

Spatial representation type: grid; grille RI_636

Metadata language: eng; CAN

Metadata language: fra; CAN

Character set: utf8; utf8 RI_458

Topic category

Elevation

Begin date: 2000

End date: 2000

Reference system identifier

https://www.epsg-registry.org / EPSG:4617 / 7.6

Date ( RI_366 ): 2010-11-02

RI_409

Reference system identifier: https://www.epsg-registry.org / EPSG:5713 / 7.6

Distribution format

WMS ( 1.3.0 )

Specification

Open Geospatial Consortium Inc., OpenGIS Web Map Service (WMS) Implementation Specification, Version 1.3.0, 2006-03-15, Reference number of this OGC® project document: 06-042 (https://portal.opengeospatial.org/files/?artifact_id=14416)
GeoTIF ( 1.0 )

File decompression technique

ZIP
ASCII Grid ( N/A )

RI_412

Government of Canada; Natural Resources Canada;Strategic Policy and Innovation Sector

OnLine resource: Canadian Digital Surface Model, Color Shaded Relief ( OGC:WMS )
Web Service;WMS;eng

OnLine resource: Canadian Digital Surface Model, Color Shaded Relief ( OGC:WMS )
Web Service;WMS;fra

OnLine resource: Download directory for pre-assembled GeoTIFF files ( HTTPS )
Dataset;GeoTIF;eng,fra

OnLine resource: Canadian Digital Surface Model - Product Specifications ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Cloud Optimized GeoTIFF of the CDSM ( HTTPS )
Dataset;GeoTIF;eng,fra

OnLine resource: Cloud Optimized GeoTIFF of the CDSM hillshade ( HTTPS )
Dataset;GeoTIF;eng,fra

OnLine resource: CDSM product index (drag and drop the kmz file in Google Earth to localize your region of interest) ( HTTPS )
Supporting Document;KMZ;eng,fra

OnLine resource: Canadian Digital Surface Model - Product Specifications ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Customized files and derived products in GeoTIFF format (Geospatial-Data Extraction tool) ( HTTPS )
Dataset;GeoTIF;eng

OnLine resource: Customized files and derived products in ASCII Grid format (Geospatial-Data Extraction tool) ( HTTPS )
Dataset;ASCII Grid;fra

OnLine resource: Customized files and derived products in GeoTIFF format (Geospatial-Data Extraction tool) ( HTTPS )
Dataset;GeoTIF;fra

OnLine resource: Customized files and derived products in ASCII Grid format (Geospatial-Data Extraction tool) ( HTTPS )
Dataset;ASCII Grid;eng

OnLine resource: NTS Index (Use to identify the number of your area of interest) ( HTTPS )
Supporting Document;HTML;fra

OnLine resource: NTS index (Use to identify the number of your area of interest) ( HTTPS )
Supporting Document;HTML;eng

OnLine resource: Documentation on the use of the Elevation API ( HTTPS )
Supporting Document;HTML;eng

OnLine resource: Documentation on the use of the Elevation API ( HTTPS )
Supporting Document;HTML;fra

Hierarchy level: dataset; jeuDonnées RI_622

Description: The 0.75-second (~20 m) CDSM consists of a derived product from the original 1-second (30 m) Shuttle Radar Topographic Mission (SRTM) digital surface model (DSM). The SRTM data were re-processed from their original form as follows: 1) the data was void-filled using the Canadian Digital Elevation Model (CDEM) with the Delta Fill Surface method from Grohman et al. (2006); 2) the Vertical Datum was changed from EGM96 to CGVD28; 3) the data was projected to UTM using cubic convolution; 4) the data was smoothed using the Denoise algorithm from Sun et al. (2010); 5) the data was re-projected from WGS84 to NAD83 and aligned to the 0.75-second CDEM grid resolution using cubic convolution; and 6) the waterbodies for which new elevations were calculated due to the change of vertical datum were re-flattened.

The horizontal reference system is the North American Datum of 1983 (NAD83 (CSRS)); the vertical reference system is the Canadian Geodetic Vertical Datum of 1928 (CGVD28)).

Metadata describing the source data and the product generation process is made available when extracting a CDSM mosaic.