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Product: These are Digital Elevation Model (DEM) data for Maine as part of the required deliverables for the ME_SouthCentral_B22, Work Unit 230147 project. Class 2 (ground) LiDAR points in conjunction with the hydro breaklines were used to create a 1 meter hydro-flattened Raster DEM.
Geographic Extent: 11 counties in Maine, covering approximately 2505 total square miles.
Dataset Description: The ME_SouthCentral_B22, Work Unit 230147 project called for the planning, acquisition, processing, and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.46 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, 2021 Rev. A. The data were developed based on a horizontal projection/datum of NAD 1983 2011 UTM Zone 19N, Meter and vertical datum of NAVD88 Geoid 18, Meter. LiDAR data were delivered as processed Classified LAS 1.4 files formatted to 3106 individual 1500 m x 1500 m tiles, as tiled intensity imagery, and as tiled bare earth DEMs; all tiled to the same 1500 m x 1500 m schema. Continuous breaklines were produced in Esri file geodatabase format.
Ground Conditions: LiDAR was collected in spring 2022, while no snow was on the ground and rivers were at or below normal levels. In order to post process the LiDAR data to meet task order specifications and meet ASPRS vertical accuracy guidelines, NV5 Geospatial utilized a total of 63 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 147 independent accuracy checkpoints, 83 in Bare Earth and Urban landcovers (83 NVA points), 64 in Tall Weeds categories (64 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data. |
| summary:
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Product: These are Digital Elevation Model (DEM) data for Maine as part of the required deliverables for the ME_SouthCentral_B22, Work Unit 230147 project. Class 2 (ground) LiDAR points in conjunction with the hydro breaklines were used to create a 1 meter hydro-flattened Raster DEM.
Geographic Extent: 11 counties in Maine, covering approximately 2505 total square miles.
Dataset Description: The ME_SouthCentral_B22, Work Unit 230147 project called for the planning, acquisition, processing, and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.46 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, 2021 Rev. A. The data were developed based on a horizontal projection/datum of NAD 1983 2011 UTM Zone 19N, Meter and vertical datum of NAVD88 Geoid 18, Meter. LiDAR data were delivered as processed Classified LAS 1.4 files formatted to 3106 individual 1500 m x 1500 m tiles, as tiled intensity imagery, and as tiled bare earth DEMs; all tiled to the same 1500 m x 1500 m schema. Continuous breaklines were produced in Esri file geodatabase format.
Ground Conditions: LiDAR was collected in spring 2022, while no snow was on the ground and rivers were at or below normal levels. In order to post process the LiDAR data to meet task order specifications and meet ASPRS vertical accuracy guidelines, NV5 Geospatial utilized a total of 63 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 147 independent accuracy checkpoints, 83 in Bare Earth and Urban landcovers (83 NVA points), 64 in Tall Weeds categories (64 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data. |
| accessInformation:
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NV5 Geospatial, powered by Quantum Spatial,Maine GeoLibrary |
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true |
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36037.0447700188 |
| typeKeywords:
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["Data","Service","Image Service","ArcGIS Server"] |
| description:
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<div style='text-align:Left;'><div><div><p><span><span>The ME_SouthCoastal_2_2020 Work Unit 212010 project called for the planning, acquisition, processing, and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.35 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, Version 2.1. The data were developed based on a horizontal projection/datum of NAD 1983 2011 UTM Zone 19N, Meter and vertical datum of NAVD88 Geoid 18, Meter. LiDAR data were delivered as processed Classified LAS 1.4 files formatted to 128 individual 1500 m x 1500 m tiles, as tiled intensity imagery, and as tiled bare earth DEMs; all tiled to the same 1500 m x 1500 m schema. Continuous breaklines were produced in Esri file geodatabase format. Ground Conditions: LiDAR was collected in spring 2020, while no snow was on the ground and rivers were at or below normal levels. In order to post process the LiDAR data to meet task order specifications and meet ASPRS vertical accuracy guidelines, NV5 Geospatial, powered by Quantum Spatial utilized a total of 64 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 151 independent accuracy checkpoints, 86 in Bare Earth and Urban landcovers (86 NVA points), 65 in Tall Weeds categories (65 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.</span></span></p><p><span /></p></div></div></div> |
| licenseInfo:
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<div style='text-align:Left;'><div><div><p><span><span>None. However, users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of their limitations. Acknowledgement of the organization providing these data to the public would be appreciated for products derived from these data.</span></span></p><p><span>.</span></p></div></div></div> |
| catalogPath:
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| title:
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Maine Elevation DEM 2022 |
| type:
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Image Service |
| url:
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https://gis.maine.gov/arcgis |
| tags:
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["elevation","LiDAR","LiDAR derivative","DEM","GeoLibrary","Maine","2022"] |
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en-US |
| name:
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Maine_Elevation_DEM_2022 |
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|
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7.38038676889986E7 |
| spatialReference:
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NAD_1983_UTM_Zone_19N |