These are Digital Elevation Model (DEM) data for Maine as part of the required deliverables for the ME_MidCoast_B21_2021, Work Units 220045 and 300071 project. Class 2 (ground) LiDAR points in conjunction with the hydro breaklines were used to create a 1-meter hydro-flattened Raster DEM.

Dataset Description: The ME_MidCoast_B21_2021, Work Unit 300071 project called for the planning, acquisition, processing, and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.71 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, 2020 Rev. A. This project was done at Quality Level 2. 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 3333 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 and fall 2021 through 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 56 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 190 independent accuracy checkpoints, 107 in Bare Earth and Urban landcovers (107 NVA points), 83 in Tall Weeds categories (83 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.

The ME_MidCoast_B21_2021, Work Unit 220045 project called for the planning, acquisition, processing, and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.71 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 1877 individual 1500 m x 1500 m tiles. Intensity imagery were formatted to 1877 individual 1500 m x 1500 m tiles. DEMs were formatted to 1885 individual 1500 m x 1500 m tiles. Continuous breaklines were produced in Esri file geodatabase format. There are 8 fewer LAS and intensity deliverables than the 1,885 that appear in the tile index. The following tiles contain no deliverable points due to being over water: 19TEJ558885.las, 19TFK616921.las, 19TFK625933.las, 19TFK627933.las, 19TFK640939.las, 19TFK651948.las, 19TFK660957.las, 19TFK652930.las.

Ground Conditions: LiDAR was collected in spring 2021, while no snow was on the ground and rivers were at or below normal levels.

These are Digital Elevation Model (DEM) data for Maine as part of the required deliverables for the ME_MidCoast_B21_2021, Work Units 220045 and 300071 project. Class 2 (ground) LiDAR points in conjunction with the hydro breaklines were used to create a 1-meter hydro-flattened Raster DEM.

Dataset Description: The ME_MidCoast_B21_2021, Work Unit 300071 project called for the planning, acquisition, processing, and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.71 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, 2020 Rev. A. This project was done at Quality Level 2. 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 3333 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 and fall 2021 through 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 56 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 190 independent accuracy checkpoints, 107 in Bare Earth and Urban landcovers (107 NVA points), 83 in Tall Weeds categories (83 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.

The ME_MidCoast_B21_2021, Work Unit 220045 project called for the planning, acquisition, processing, and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.71 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 1877 individual 1500 m x 1500 m tiles. Intensity imagery were formatted to 1877 individual 1500 m x 1500 m tiles. DEMs were formatted to 1885 individual 1500 m x 1500 m tiles. Continuous breaklines were produced in Esri file geodatabase format. There are 8 fewer LAS and intensity deliverables than the 1,885 that appear in the tile index. The following tiles contain no deliverable points due to being over water: 19TEJ558885.las, 19TFK616921.las, 19TFK625933.las, 19TFK627933.las, 19TFK640939.las, 19TFK651948.las, 19TFK660957.las, 19TFK652930.las.

Ground Conditions: LiDAR was collected in spring 2021, while no snow was on the ground and rivers were at or below normal levels.