2020 NYSITS Lidar: Finger Lakes, NY

Product: These lidar data are processed Classified LAS 1.4 files, formatted to 2236 individual 1500 m x 1500 m tiles; used to create intensity rasters, 3D breaklines and hydro-flattened DEMs as necessary.

Geographic Extent: Schuyler, Seneca, Steuben, Tompkins, Wayne and Yates counties, New York, covering approximately 1945 square miles.

Dataset Description: The 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 2.1.The data was developed based on a horizontal projection/datum of NAD83 (2011), Universal Transverse Mercator, 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 2239 individual 1500 m x 1500 m tiles, as tiled Intensity Rasters, and as tiled bare-earth DEMs; all tiled to the same 1500 m x 1500 m schema.

Ground Conditions: Lidar was collected in early 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, Sanborn Map Company, Inc., established a total of 25 ground control points that were used to calibrate the lidar to known ground locations established throughout the project area.An additional 131 independent accuracy checkpoints, 73 in Bare Earth and Urban landcovers (73 NVA points), 58 in Tall Grass and Brushland/Low Trees 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.

This metadata supports the data entry in the NOAA Digital Coast Data Access Viewer (DAV). For this data set, the DAV is leveraging the Entwine Point Tiles (EPT) hosted by USGS on Amazon Web Services.

To acquire detailed surface elevation data for use in conservation planning, design, research, floodplain mapping, dam safety assessments and elevation modeling, etc. Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create Intensity Images, Breaklines and Raster DEM. The purpose of these lidar data was to produce high accuracy 3D hydro-flattened Digital Elevation Model (DEM) with a 1 meter cell size.These lidar point cloud data were used to create intensity images, 3D breaklines, and hydro-flattened DEMs as necessary.

USGS Contract No. G20AC00105

CONTRACTOR: New York Office of Information Technology Services. SUBCONTRACTOR: Sanborn Map Company, Inc. Lidar data were acquired and calibrated by Sanborn Map Company, Inc. All follow-on processing was completed by the prime contractor.

-<ldrinfo>

<ldrspec>U.S. Geological Survey (USGS) - National Geospatial Program (NGP) Lidar Base Specification v2.1</ldrspec>

<ldrsens>Leica TerrainMapper</ldrsens>

<ldrmaxnr>15</ldrmaxnr>

<ldrnps>0.66</ldrnps>

<ldrdens>2.27</ldrdens>

<ldranps>0.666</ldranps>

<ldradens>2.27</ldradens>

<ldrfltht>3228</ldrfltht>

<ldrfltsp>160</ldrfltsp>

<ldrscana>40</ldrscana>

<ldrscanr>87.0</ldrscanr>

<ldrpulsr>688.3</ldrpulsr>

<ldrpulsd>4</ldrpulsd>

<ldrpulsw>0.75</ldrpulsw>

<ldrwavel>1064</ldrwavel>

<ldrmpia>1</ldrmpia>

<ldrbmdiv>0.25</ldrbmdiv>

<ldrswatw>2350</ldrswatw>

<ldrswato>20</ldrswato>

<ldrgeoid>National Geodetic Survey (NGS) Geoid12B</ldrgeoid>

</ldrinfo>

-<ldraccur>

<ldrchacc>0</ldrchacc>

<rawnva>0</rawnva>

<rawnvan>0</rawnvan>

<clsnva>0</clsnva>

<clsnvan>0</clsnvan>

<clsvva>0</clsvva>

<clsvvan>0</clsvvan>

</ldraccur>

-<lasinfo>

<lasver>1.4</lasver>

<lasprf>6</lasprf>

<laswheld>Withheld (ignore) points were identified in these files using the standard LAS Withheld bit.</laswheld>

<lasolap>Swath "overage" points were identified in these files using the standard LAS overlap bit.</lasolap>

<lasintr>11</lasintr>

-<lasclass>

<clascode>1</clascode>

<clasitem>Processed, but Unclassified</clasitem>

</lasclass>

-<lasclass>

<clascode>2</clascode>

<clasitem>Bare Earth Ground</clasitem>

</lasclass>

-<lasclass>

<clascode>7</clascode>

<clasitem>Low Noise</clasitem>

</lasclass>

-<lasclass>

<clascode>9</clascode>

<clasitem>Water</clasitem>

</lasclass>

-<lasclass>

<clascode>17</clascode>

<clasitem>Bridge Decks</clasitem>

</lasclass>

-<lasclass>

<clascode>18</clascode>

<clasitem>High Noise</clasitem>

</lasclass>

-<lasclass>

<clascode>20</clascode>

<clasitem>Ignored Ground</clasitem>

</lasclass>

-<lasclass>

<clascode>21</clascode>

<clasitem>Snow</clasitem>

</lasclass>

-<lasclass>

<clascode>22</clascode>

<clasitem>Temporal Exclusion</clasitem>

</lasclass>

</lasinfo>

</lidar>

Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners.

Data is available online for bulk and custom downloads.

None

Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations.

This data set was produced to meet ASPRS Positional Accuracy Standard for Digital Geospatial Data (2014) for a 10-cm RMSEz Vertical Accuracy Class.

USGS Determined Vertical Accuracy

Non-Vegetated Vertical Accuracy (NVA) = 6.4 cm RMSE

Vegetated Vertical Accuracy (VVA) = 13.04 cm at the 95th Percentile

These LAS data files include all data points collected. No points have been removed or excluded. A visual qualitative assessment was performed to ensure data completeness. Data voids may be present where surface is of low near infrared reflectivity, such as asphalt or composition roofing. These data dropouts were observed on building rooftops in the project area. Extreme positive and negative Z values may exist within the lidar point cloud; these points are classified as Class 7 (Low Noise) and/or Class 18 (High Noise).Partially elevated waterbodies may be present where use of Class 20 (Ignored Ground) next to the hydro breaklines has eliminated ground points on a small berm or raised bank. The raw point cloud is of good quality and data passes Non-vegetated Vertical Accuracy specifications.

Data covers the entire area specified for this project.

Data is backed up to tape and to cloud storage.

The Finger Lakes, NY lidar was ingested into the Data Access Viewer for custom product generation by leveraging USGS hosted Entwine Point Tiles.