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Raster dataset representing the bare earth surface of the Essex Region.
The Airborne Topographic Lidar (ATL) acquisition was initiated during the fall of 2016, spring/fall of 2017 and spring of 2018 through a collaborative partnership between the Ministry of Natural Resources and Forestry (MNRF), the Ministry of Agriculture, Food and Rural Affairs (OMAFRA) and a private contractor; it covers the entirety of, and is limited to, the Essex Region. The Lidar Digital Terrain Model is a 50 cm raster representing the bare-earth terrain derived from a classified lidar point cloud, which has been hydro-flattened using water body breaklines.
This data set was produced to meet accuracy standards for Ontario Digital Geospatial Data for a 5 cm Vertical Accuracy Class equating to Non-vegetated Vertical Accuracy (NVA) of +/- 9.8 cm at 95% confidence level and Vegetated Vertical Accuracy (VVA) of +/- 14.7 cm at the 95th percentile.
The original dataset's horizontal and vertical reference systems/datums are as follows:
Horizontal: NAD 83 CSRS epoch 2010 UTM Zone 17 N
Vertical: CGVD2013
The Essex Region Conservation Authorityhas converted the vertical datum to CGVD28:78 using the GPS-H tool from NRCan. The methodology used for this conversion is available from ERCA upon request.
Source dataset metadata record (retrieved 20200304):
https://geohub.lio.gov.on.ca/datasets/mnrf::ontario-digital-terrain-model-lidar-derived
Source dataset user guide (retrieved 20200304):
https://www.sdc.gov.on.ca/sites/MNRF-PublicDocs/EN/CMID/Ontario-DTM-Lidar-Derived-User-Guide.docx
Raster dataset representing the bare earth surface of the Essex Region.
The Airborne Topographic Lidar (ATL) acquisition was initiated during the fall of 2016, spring/fall of 2017 and spring of 2018 through a collaborative partnership between the Ministry of Natural Resources and Forestry (MNRF), the Ministry of Agriculture, Food and Rural Affairs (OMAFRA) and a private contractor; it covers the entirety of, and is limited to, the Essex Region. The Lidar Digital Terrain Model is a 50 cm raster representing the bare-earth terrain derived from a classified lidar point cloud, which has been hydro-flattened using water body breaklines.
This data set was produced to meet accuracy standards for Ontario Digital Geospatial Data for a 5 cm Vertical Accuracy Class equating to Non-vegetated Vertical Accuracy (NVA) of +/- 9.8 cm at 95% confidence level and Vegetated Vertical Accuracy (VVA) of +/- 14.7 cm at the 95th percentile.
The original dataset's horizontal and vertical reference systems/datums are as follows:
Horizontal: NAD 83 CSRS epoch 2010 UTM Zone 17 N
Vertical: CGVD2013
The Essex Region Conservation Authorityhas converted the vertical datum to CGVD28:78 using the GPS-H tool from NRCan. The methodology used for this conversion is available from ERCA upon request.
Source dataset metadata record (retrieved 20200304):
https://geohub.lio.gov.on.ca/datasets/mnrf::ontario-digital-terrain-model-lidar-derived
Source dataset user guide (retrieved 20200304):
https://www.sdc.gov.on.ca/sites/MNRF-PublicDocs/EN/CMID/Ontario-DTM-Lidar-Derived-User-Guide.docx