Data Management Plan

Product: These are Digital Elevation Model (DEM) data for Upstate New York as part of the required deliverables for the New York FEMA 2018 LiDAR 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: Five counties in New York, covering approximately 1,935 total square miles.

Dataset Description: The New York FEMA 2017 LiDAR 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 1.3. LiDAR data were delivered as processed Classified LAS 1.4 files formatted to 2,477 individual 1,500-meter x 1,500-meter tiles, as tiled intensity imagery, and as tiled bare earth DEMs; all tiled to the same 1,500-meter x 1,500-meter schema. Continuous breaklines were produced in Esri file geodatabase format.

Ground Conditions: LiDAR was collected in spring of 2018, 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, Quantum Spatial, Inc. utilized a total of 44 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 129 independent accuracy checkpoints, 71 in Bare Earth and Urban landcovers (71 NVA points), 58 in Tall Weeds categories (58 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 NOAA Office for Coastal Management (OCM) downloaded the 2477 DEM files from the New York State GIS site. The data were downloaded from this URL: ftp://ftp.gis.ny.gov/elevation/DEM/FEMA_FultonSaratogaHerkimerFranklin2017/. The data were processed to the Data Access Viewer (DAV) and http. In addition to these bare earth Digital Elevation Model (DEM) data, the lidar point data that these DEM data were created from, are also available. These data are available for custom download at the link provided in the URL section of this metadata record.

Lineage Statement:
Data were collected and processed by Quantum Spatial, Inc. for FEMA. The data were downloaded from the New York State GIS ftp site by the NOAA Office for Coastal Management (OCM) where the data were processed to make it available for custom download from the Data Access Viewer (DAV) and bulk download from https.

Process Steps:

• The New York FEMA LiDAR 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 1.3. The data were developed based on a horizontal projection/datum of NAD83 (2011), State Plane New York East FIPS 3101, meters and vertical datum of NAVD88 (GEOID 12B), meters. LiDAR data were delivered as processed Classified LAS 1.4 files formatted to 2,477 individual 1,500-meter x 1,500-meter tiles, as tiled intensity imagery, and as tiled bare earth DEMs; all tiled to the same 1,500-meter x 1,500-meter schema. Continuous breaklines were produced in Esri file geodatabase format. Ground Conditions: LiDAR was collected in spring of 2018, 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, Quantum Spatial, Inc. utilized a total of 44 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 129 independent accuracy checkpoints, 71 in Bare Earth and Urban landcovers (71 NVA points), 58 in Tall Weeds categories (58 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data
• 2018-01-01 00:00:00 - Hydro-Flattened Raster DEM Processing: Class 2 (Ground) LiDAR points in conjunction with the hydro-breaklines were used to create a 1-meter hydro-flattened raster DEM. Using automated scripting routines within ArcMap, an ERDAS Imagine .IMG file was created for each tile. Each surface was reviewed using Global Mapper to check for any surface anomalies or incorrect elevations found within the surface.
• 2021-06-11 00:00:00 - The NOAA Office for Coastal Management (OCM) downloaded 2477 digital elevation model (DEM) files in img format from the NY State GIS ftp site (ftp://ftp.gis.ny.gov/elevation/DEM/FEMA_FultonSaratogaHerkimerFranklin2017/) . The bare earth raster files were at a 1 m grid spacing. The data were in NY State Plane East NAD83 (2011), meters coordinates and NAVD88 (Geoid 12B) elevations in meters. OCM assigned the appropriate EPSG codes (Horiz - 6536, Vert - 5703) and copied the raster files to https for Digital Coast storage and provisioning purposes.

Data is available online for bulk and custom downloads.