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 "description": "<DIV STYLE=\"text-align:Left;\"><DIV><DIV><P><SPAN>Raster dataset representing the bare earth surface of the Essex Region.<\/SPAN><\/P><P STYLE=\"margin:0 0 0 0;\"><SPAN><SPAN>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. <\/SPAN><\/SPAN><\/P><P STYLE=\"margin:0 0 0 0;\"><SPAN /><\/P><P STYLE=\"margin:0 0 0 0;\"><SPAN>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. <\/SPAN><\/P><P STYLE=\"margin:0 0 0 0;\"><SPAN /><\/P><P STYLE=\"margin:0 0 0 0;\"><SPAN>The original dataset's horizontal and vertical reference systems/datums are as follows:<\/SPAN><\/P><P STYLE=\"margin:0 0 0 0;\"><SPAN><SPAN>Horizontal: NAD 83 CSRS epoch 2010 UTM Zone 17 N<\/SPAN><\/SPAN><\/P><P STYLE=\"margin:0 0 0 0;\"><SPAN><SPAN>Vertical: CGVD2013<\/SPAN><\/SPAN><\/P><P STYLE=\"font-weight:bold;margin:0 0 0 0;\"><SPAN /><\/P><P STYLE=\"font-weight:bold;margin:0 0 0 0;\"><SPAN>The <\/SPAN><SPAN><SPAN>Essex Region Conservation Authority<\/SPAN><\/SPAN><SPAN><SPAN>has 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.<\/SPAN><\/SPAN><\/P><P STYLE=\"margin:0 0 0 0;\"><SPAN /><\/P><P STYLE=\"margin:0 0 0 0;\"><SPAN>Source dataset metadata record (retrieved 20200304): <\/SPAN><\/P><P STYLE=\"margin:0 0 0 0;\"><SPAN /><A href=\"https://geohub.lio.gov.on.ca/datasets/mnrf::ontario-digital-terrain-model-lidar-derived\"><SPAN><SPAN>https://geohub.lio.gov.on.ca/datasets/mnrf::ontario-digital-terrain-model-lidar-derived<\/SPAN><\/SPAN><\/A><\/P><P STYLE=\"margin:0 0 0 0;\"><SPAN /><\/P><P STYLE=\"margin:0 0 0 0;\"><SPAN>Source dataset user guide (retrieved 20200304):<\/SPAN><\/P><P STYLE=\"margin:0 0 0 0;\"><SPAN /><A href=\"https://www.sdc.gov.on.ca/sites/MNRF-PublicDocs/EN/CMID/Ontario-DTM-Lidar-Derived-User-Guide.docx\"><SPAN><SPAN>https://www.sdc.gov.on.ca/sites/MNRF-PublicDocs/EN/CMID/Ontario-DTM-Lidar-Derived-User-Guide.docx<\/SPAN><\/SPAN><\/A><\/P><P><SPAN /><\/P><P><SPAN /><\/P><\/DIV><\/DIV><\/DIV>",
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 "copyrightText": "CGVD28:78 DEM surface derived by ERCA based on MNRF Lidar \u2013 Digital Terrain Model (2016-18). Copyright ERCA, 2019. Contains information licensed under the Open Government Licence \u2013 Ontario \n\n(www.ontario.ca/page/open-government-licence-ontario)",
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