Data Management Plan (Deprecated)

Product: These are Digital Elevation Model (DEM) data for Franklin, Lewis, Madison, Oneida, Onondaga, Oswego, and St. Lawrence Counties, New York as part of the required deliverables for the New York 2016 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: Seven counties in New York, covering approximately 4,474 total square miles. East Zone AOI is Franklin and St. Lawrence Counties, Central Zone AOI is Lewis, Madison, Oneida, Onondaga, and Oswego Counties.

Dataset Description: New York FEMA 2016 QL2 Lidar project called for the planning, acquisition, processing, and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.7 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.2. Lidar data was delivered as flightline-extent unclassified LAS swaths, as processed classified LAS 1.4 files formatted to 4,597 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. Contours with a 1-foot interval were produced in Esri file geodatabase format, tiled to the same 1,500-meter x 1,500-meter schema.

Ground Conditions: Lidar was collected in winter/spring of 2016/2017, 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. established a total of 76 ground control points that were used to calibrate the lidar to known ground locations established throughout the New York East Zone (Franklin and St. Lawrence Counties) project area. An additional 71 independent accuracy checkpoints, 71 in Bare Earth and Urban landcovers (59 NVA points), 59 in Forested, Brushland/Trees, and Tall Weeds/Crops categories (59 VVA points), were used to assess the vertical accuracy of the data. Quantum Spatial, Inc. established a total of 30 ground control points that were used to calibrate the lidar to known ground locations established throughout the New York Central Zone (Lewis, Madison, Oneida, Onondaga, and Oswego Counties) project area. An additional 68 independent accuracy checkpoints, 43 in Bare Earth and Urban landcovers (43 NVA points), 25 in Forested, Brushland/Trees, and Tall Weeds/Crops categories (25 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 5948 DEM files (4597 files for the East Zone AOI and 1351 files for the Central Zone AOI) from the New York State GIS site. The data were downloaded from these URLs: ftp://ftp.gis.ny.gov/elevation/DEM/FEMA_FranklinStLawrence2016/ and ftp://ftp.gis.ny.gov/elevation/DEM/FEMA_OneidaSubbasin2016/. 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 and the breaklines 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 DEM 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:

• Dataset Description: New York FEMA 2016 QL2 Lidar project called for the planning, acquisition, processing, and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.7 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.2. The data for counties in the East Zone AOI were developed based on a horizontal projection/datum of NAD83 (2011), State Plane New York East Zone, meters and vertical datum of NAVD88 (GEOID12B), meters. The data for counties in the Central Zone AOI were developed based on a horizontal projection/datum of NAD83 (2011), State Plane New York Central Zone, meters and vertical datum of NAVD88 (GEOID12B), meters. Lidar data was delivered as flightline-extent unclassified LAS swaths, as processed classified LAS 1.4 files formatted to 5948 (4597 files for the East Zone AOI and 1351 files for the Central Zone AOI) 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. Contours with a 1-foot interval were produced in Esri file geodatabase format, tiled to the same 1,500-meter x 1,500-meter schema. Ground Conditions: Lidar was collected in winter/spring of 2016/2017, while no snow was on the ground and rivers were at or below normal levels.
• 2017-01-01 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 is reviewed using Global Mapper to check for any surface anomalies or incorrect elevations found within the surface.
• 2021-06-04 00:00:00 - The NOAA Office for Coastal Management (OCM) downloaded 5948 (4597 files for the East Zone AOI and 1351 files for the Central Zone AOI) digital elevation model (DEM) files in img format from the NY State GIS ftp site (ftp://ftp.gis.ny.gov/elevation/DEM/FEMA_FranklinStLawrence2016/ and ftp://ftp.gis.ny.gov/elevation/DEM/FEMA_OneidaSubbasin2016/) . The bare earth raster files were at a 1 m grid spacing. The data were in NY State Plane East (Franklin and St. Lawrence) and NY State Plane Central (Oneida Subbasin) NAD83 (2011), meters coordinates and NAVD88 (Geoid 12B) elevations in meters. OCM assigned the appropriate EPSG codes (Horiz - 6534 (Oneida Subbasin) and 6536 (Franklin and St.Lawrence), 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.