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Compilation of historical and recent digital elevation models (surface models) derived through Light Detection and Ranging (LiDAR) data of the Northwest Territories. The compilation represents georeferenced coverage of very high resolution data (1 m spatial resolution) of NWT communities, infrastructure corridors, and other areas of interest. Digital surface models (DSM) represent the elevations of both the natural and built environment, including bare ground, vegetation, and buildings. Elevations are referenced to either the CGVD28 HT2.0 (Canadian Geodetic Vertical Datum of 1928, Height Transformation 2.0; unknown epochs) or the current CGVD2013 (Canadian Geodetic Vertical Datum of 2013) vertical datum, however, for a limited number of datasets the vertical datum is unknown. Models were derived from LiDAR pointclouds at 1-m spatial resolution. LiDAR vendors may have performed positional adjustments based on ground control points where necessary based on project requirements. Positional and elevation accuracies are project-specific, with limited independent validation.<\/span><\/p><\/div><\/div><\/div>", "name": "Mosaics/NWTCG_LiDAR_DSM_External_Referenced", "description": "

Compilation of historical and recent digital elevation models (surface models) derived through Light Detection and Ranging (LiDAR) data of the Northwest Territories. The compilation represents georeferenced coverage of very high resolution data (1 m spatial resolution) of NWT communities, infrastructure corridors, and other areas of interest. Digital surface models (DSM) represent the elevations of both the natural and built environment, including bare ground, vegetation, and buildings. Elevations are referenced to either the CGVD28 HT2.0 (Canadian Geodetic Vertical Datum of 1928, Height Transformation 2.0; unknown epochs) or the current CGVD2013 (Canadian Geodetic Vertical Datum of 2013) vertical datum, however, for a limited number of datasets the vertical datum is unknown. Models were derived from LiDAR pointclouds at 1-m spatial resolution. LiDAR vendors may have performed positional adjustments based on ground control points where necessary based on project requirements. 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Standard deviation stretch is used and applies a linear stretch between values within two standard deviations (minimum: 0 m, maximum 1000 m). Dynamic Range Adjustment is enabled so that statistics are calculated from pixels displayed on the screen.", "help": "" }, { "name": "Aspect (numeric)", "description": "Aspect (numerical)", "help": "" }, { "name": "Aspect (RGB colour map)", "description": "Aspect RGB map with flat areas (returning -1) shown in gray .", "help": "" }, { "name": "Slope (numeric)", "description": "Slope calculated as degrees.", "help": "" }, { "name": "Slope (RGB colour map)", "description": "Slope represented as a RGB map for visualization purposes.", "help": "" }, { "name": "Hillshade multidirectional", "description": "Hillshade calculated based on multidirectional viewpoints.", "help": "" }, { "name": "Shaded relief multidirectional", "description": "Shaded relief calculated based on multidirectional vliewpoints.", "help": "" }, { "name": "Contour lines (cartographic)", "description": "Contour Lines with 1m interval whereby every 5th line is bold. 10m adaptive smoothing is used for optimal cartographic representation at any scale.", "help": "" }, { "name": "Normalized Heights", "description": "Normalized DSM as a proxy for building/vegetation height. \n- Subtracted DTM from DSM \n- Reset any values less than 0.2 m to 0 m\n- Trim any value greater than 100 m to preserve visible range.", "help": "" }, { "name": "None", "description": "", "help": "" } ], "rasterTypeInfos": [ { "name": "Raster Dataset", "description": "Supports all ArcGIS Raster Datasets", "help": "" } ], "mensurationCapabilities": "Basic", "hasHistograms": false, "hasColormap": false, "hasRasterAttributeTable": false, "minScale": 0, "maxScale": 0, "exportTilesAllowed": false, "supportsStatistics": true, "supportsAdvancedQueries": true, "editFieldsInfo": null, "ownershipBasedAccessControlForRasters": null, "allowComputeTiePoints": false, "useStandardizedQueries": true, "advancedQueryCapabilities": { "useStandardizedQueries": true, "supportsStatistics": true, "supportsOrderBy": true, "supportsDistinct": true, "supportsPagination": true }, "spatialReference": { "wkid": 102100, "latestWkid": 3857 } }