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Summary
Item Identification
Keywords
Physical Location
Data Set Info
Support Roles
Extents
Spatial Info
Access Info
Distribution Info
URLs
Tech Environment
Data Quality
Data Management
Lineage
Catalog Details

Summary

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Short Citation
OCM Partners, 2024: 2009 NYS DEC Lidar: West of Hudson, NY, https://www.fisheries.noaa.gov/inport/item/63037.
Full Citation Examples

Abstract

Lidar based surface elevation data collection project in WOH (NYSDEP), collected in 2009. Products generated include LiDAR point data in LAS Binary format v1.1.

The final LiDAR LAS 1.1 was created in UTM Zone 18 North, referenced to NAD83 and NAVD 88, in meters. The final LiDAR DEM was verified against FEMA checkpoints in order to perform a redundency check against the GPS solutions. These accuracy checks also verified that the data meets the guidelines outlined in FEMA's Guidelines and Specifications for Flood Hazard Mapping Partners and Appendix 4B, Airborne Light Detection and Ranging Systems.

The areas of interest were flown at an altitude of 1200 meters (3937 feet) above mean terrain.

Airspeed - 120 knots,

Laser Pulse Rate - 50,000 Hz,

Full Field of View - 60 degrees,

Scane Rate - 32 Hz,

Swath Width - 1300 meters.

Distribution Information

  • Create custom data files by choosing data area, product type, map projection, file format, datum, etc. A new metadata will be produced to reflect your request using this record as a base. Change to an orthometric vertical datum is one of the many options.

  • LAS/LAZ - LASer

    Bulk download of data files in LAZ format, geographic coordinates, orthometric heights. Note that the vertical datum (hence elevations) of the files here are different than described in this document. They will be in an orthometric datum.

Access Constraints:

None

Use Constraints:

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be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions.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.

Controlled Theme Keywords

COASTAL BATHYMETRY, COASTAL ELEVATION, elevation, TERRAIN ELEVATION

Child Items

No Child Items for this record.

Contact Information

Point of Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202

Metadata Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202

Extents

Geographic Area 1

-75.407586° W, -74.038881° E, 42.4816° N, 41.768409° S

Time Frame 1
2009-03-31 - 2009-06-24

Item Identification

Title: 2009 NYS DEC Lidar: West of Hudson, NY
Status: Completed
Publication Date: 2009-09-01
Abstract:

Lidar based surface elevation data collection project in WOH (NYSDEP), collected in 2009. Products generated include LiDAR point data in LAS Binary format v1.1.

The final LiDAR LAS 1.1 was created in UTM Zone 18 North, referenced to NAD83 and NAVD 88, in meters. The final LiDAR DEM was verified against FEMA checkpoints in order to perform a redundency check against the GPS solutions. These accuracy checks also verified that the data meets the guidelines outlined in FEMA's Guidelines and Specifications for Flood Hazard Mapping Partners and Appendix 4B, Airborne Light Detection and Ranging Systems.

The areas of interest were flown at an altitude of 1200 meters (3937 feet) above mean terrain.

Airspeed - 120 knots,

Laser Pulse Rate - 50,000 Hz,

Full Field of View - 60 degrees,

Scane Rate - 32 Hz,

Swath Width - 1300 meters.

Purpose:

Support of FEMA's Floodplain Map Modernization Program. Multiple other uses expected.

Supplemental Information:

In the spring of 2009, The Sanborn Map Company, Inc. (Sanborn) acquired 1996.18 square miles of terrestrial LiDAR data in WOH (NYSDEP) 2009. Two Leica Airborne LiDAR sensors was used for the collection. The LiDAR data associated with this metadata file is in LAS binary format, version 1.1 (ASPRS specification, see Cross References).

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY > COASTAL BATHYMETRY
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION
ISO 19115 Topic Category
elevation
UNCONTROLLED
EDI Thesaurus LiDAR
EDI Thesaurus LiDAR Point Cloud

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > LAND SURFACE
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > SEA FLOOR
UNCONTROLLED
Geographic Names Information System New York
Geographic Names Information System WOH

Instrument Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Instrument Keywords
LIDAR > Light Detection and Ranging

Platform Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Platform Keywords
Airplane > Airplane

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Elevation
Maintenance Frequency: None Planned
Data Presentation Form: Model (digital)
Entity Attribute Detail Citation:

The LAS file is version 1.1 (see ASPRS LAS 1.1 cross reference) and includes the following information at the file level: GUID (project identifier), file creation day and year, Variable Length Records (VLR) which include file projection information. The LAS 1.1 file contains the following information at the point level: Grid coordinate (x,y,z), 8-bit intensity value, return number, scan direction, classification value, Point Source ID (flight-line delineator), GPS Time (GPS seconds of the we

Distribution Liability:

New York State Department of Environmental Preservation (NYS DEC) provides these geographic data "as is." NYS DEC makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. NYS DEC further makes no warranty, either expressed or implied, regarding the condition of the product or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on a computer system at NYSDEP, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. NYS DEC shall not be held liable for improper or incorrect use of the data described and/or contained herein.

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

Data Set Credit: New York State Department of Environmental Preservation, Division of Water, Watershed GIT Support Group

Support Roles

Data Steward

CC ID: 990239
Date Effective From: 2020
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Distributor

CC ID: 990238
Date Effective From: 2020
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Metadata Contact

CC ID: 990240
Date Effective From: 2020
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Point of Contact

CC ID: 990241
Date Effective From: 2020
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1145153
W° Bound: -75.407586
E° Bound: -74.038881
N° Bound: 42.4816
S° Bound: 41.768409

Extent Group 1 / Time Frame 1

CC ID: 1145152
Time Frame Type: Range
Start: 2009-03-31
End: 2009-06-24

Spatial Information

Spatial Representation

Representations Used

Grid: No
Vector: Yes
Text / Table: No
TIN: No
Stereo Model: No
Video: No

Vector Representation 1

CC ID: 990233
Point Object Present?: Yes
Point Object Count: 20032884536

Access Information

Security Class: Unclassified
Data Access Procedure:

Data is available online for bulk or custom downloads

Data Access Constraints:

None

Data Use Constraints:

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.

Distribution Information

Distribution 1

CC ID: 990245
Start Date: 2020-10-04
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=9180/details/9180
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2020 - Present)
File Name: Customized Download
Description:

Create custom data files by choosing data area, product type, map projection, file format, datum, etc. A new metadata will be produced to reflect your request using this record as a base. Change to an orthometric vertical datum is one of the many options.

File Type (Deprecated): Zip
Compression: Zip

Distribution 2

CC ID: 990246
Start Date: 2020-10-04
End Date: Present
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/9180/index.html
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2020 - Present)
File Name: Bulk Download
Description:

Bulk download of data files in LAZ format, geographic coordinates, orthometric heights. Note that the vertical datum (hence elevations) of the files here are different than described in this document. They will be in an orthometric datum.

File Type (Deprecated): LAZ
Distribution Format: LAS/LAZ - LASer
Compression: Zip

URLs

URL 1

CC ID: 990235
URL: https://coast.noaa.gov/dataviewer/
Name: NOAA's Office for Coastal Management (OCM) Data Access Viewer (DAV)
URL Type:
Online Resource
File Resource Format: HTML
Description:

The Data Access Viewer (DAV) allows a user to search for and download elevation, imagery, and land cover data for the coastal U.S. and its territories. The data, hosted by the NOAA Office for Coastal Management, can be customized and requested for free download through a checkout interface. An email provides a link to the customized data, while the original data set is available through a link within the viewer.

URL 2

CC ID: 990236
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/9180/supplemental/extent_NYC_west_hudson_m9180.kmz
Name: Browse graphic
URL Type:
Browse Graphic
File Resource Format: KML
Description:

This graphic displays the footprint for this lidar data set.

Technical Environment

Description:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.6.1500

Data Quality

Horizontal Positional Accuracy:

The LiDAR data horizontal accuracy is in compliance with the National Standard for Spatial Data Accuracy (NSSDA) RMSE estimation of elevation data in support of 2ft. contour mapping products as it is referenced in the FEMA guidelines for flood hazard mapping, appendix A (see Cross References). Quantitative value: 1.000 m RMSE, Test that produced the valued: Horizontal error associated with this LiDAR data set is a function of several factors including acquisition practices, height of the sensor above terrain, point spacing, diameter of the pulse footprint, network control station coordinates, kinematic GPS solutions, IMU calibration and post-processing functions.

Vertical Positional Accuracy:

The LiDAR data vertical accuracy is in compliance with the National Standard for Spatial Data Accuracy (NSSDA) RMSE estimation of elevation data in support of 2ft. contour mapping products as it is referenced in the FEMA guidelines for flood hazard mapping, appendix A (see Cross References). The Sanborn Map Company has performed a data accuracy validation and found this data to be in compliance. Additionaly, The New York State Department of Environmental Preservation performed a ground control analysis of the NY LiDAR data using ground control checkpoints in several land cover classes and found the resultant RMSE in the exposed ground class to be within the contract specifications of 0.185 meters.Quantitative value: 0.185 m RMSE, Test that produced the value: Vertical error associated with this LiDAR data is a function of several factors including acquisition practices, height of the sensor above terrain, point spacing, diameter of the pulse footprint, network control station coordinates, kinematic GPS solutions, IMU calibration and post-processing functions.

Completeness Report:

The 2009 NY LiDAR data associated with this metadata file completely covers the project-specified boundary with no data voids caused by acquisition or sensor issues.

Conceptual Consistency:

The 2009 NY LiDAR data associated with this metadata file has met all quality checks in terms of relative accuracy, absolute accuracy, coverage. and point and file format. The relative accuracy of the LiDAR data refers to how well the data set matches within itself. That is to say, adjacent LiDAR scans are in alignment with each other with no vertical or horizontal shifts caused by improper calibration and/or georeferencing. The absolute elevation has been validated by both Sanborn and NYS DEC. This was done by comparing the LiDAR ground surface against known ground control points. The data file format and point attribution is in compliance with the LAS version 1.1 specifications (see ASPRS LAS1.1 cross reference).

Data Management

Have Resources for Management of these Data Been Identified?: Yes
Approximate Percentage of Budget for these Data Devoted to Data Management: Unknown
Do these Data Comply with the Data Access Directive?: Yes
Actual or Planned Long-Term Data Archive Location: NCEI-CO
How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive?:

Data is backed up to tape and to cloud storage.

Lineage

Sources

LiDAR Acquisition Parameters

CC ID: 1145141
Contact Role Type: Originator
Contact Type: Organization
Contact Name: Sanborn
Publish Date: 2009-06-24
Extent Type: Discrete
Extent Start Date/Time: 2009-06-24
Source Contribution:

The following values are nominal and were taken directly from the LiDAR flight planning software for the Optech system - ALTM-NAV Planner v.2.0.52. Several variables could have affected these figures including wind speed, air turbulence, pilot error and subtle changes in terrain. One issue encountered during the NY LiDAR campaign was a shift in wind direction causing alternating head and tail winds. The pilot did what was possible to keep the ground speed of the aircraft close to 120 knots however could not cancel out this problem entirely. The resulting effect on the point cloud is a change in the point spacing; increasing with the tailwind and decreasing with the headwind. The average point density for the entire NY LiDAR data set should be somewhat consistent regardless of the wind issue.

The areas of interest were flown at an altitude of 1200 meters (3937 feet) above mean terrain.

Airspeed - 120 knots,

Laser Pulse Rate - 50,000 Hz,

Full Field of View - 60 degrees,

Scane Rate - 32 Hz,

Swath Width - 1300 meters.

Report of Survey - Ground Control

CC ID: 1145142
Contact Role Type: Originator
Contact Type: Organization
Contact Name: Sanborn
Publish Date: 2009-06-09
Source Contribution:

Ground Control: X,Y,Z

598538.296 4591353.934 322.866

590384.087 4578455.087 168.941

590540.135 4587940.729 135.632

590630.285 4583427.292 168.539

589826.617 4578257.171 123.774

590422.522 4589177.338 121.721

602810.281 4592789.119 215.014

607108.305 4588314.292 155.988

597850.386 4590811.304 309.875

598763.945 4578194.974 191.793

601367.188 4584840.656 107.463

602773.781 4592801.105 217.981

594284.184 4572059.404 104.295

606338.273 4574885.380 135.672

599577.466 4576356.278 133.079

588936.680 4572298.184 2.389

607308.851 4583738.702 181.576

607066.856 4588325.969 155.748

598515.616 4591382.960 323.784

595300.243 4588736.091 323.564

603240.986 4587215.339 142.469

606402.898 4581152.286 198.288

Process Steps

Process Step 1

CC ID: 1145143
Description:

Data collection:

Using Sanborn's Leica ALTM_SN40 and ALTM_SN49 Light Detection And Ranging (LiDAR) system, 428 flight lines of standard density (1.0 meter ground sample distance) data were collected over areas in WOH (NYSDEP) 2009 (approximately 1996.18 square miles). Two returns were recorded for each laser pulse along with an intensity value for each return. The data acquisition occurred in 45 missions between April 16, 2009 , and June 25, 2009. During the LiDAR campaign, the Sanborn field crew conducted a GPS field survey to establish final coordinates of the ground control stations for final processing of the base-remote GPS solutions.

Process Date/Time: 2009-01-01 00:00:00

Process Step 2

CC ID: 1145144
Description:

Airborne GPS processing:

Airborne GPS data was differentially processed and integrated with the post processed IMU data to derive a smoothed best estimate of trajectory (SBET). The SBET was used to reduce the LiDAR slant range measurements to a raw georeferenced point.

Airborne GPS is differentially processed using the GrafNAV v7.50 software by Waypoint Consulting of Calgary, Alberta, Canada.

Process Date/Time: 2009-01-01 00:00:00

Process Step 3

CC ID: 1145145
Description:

IMU data processing:

IMU data provides information concerning roll, pitch and yaw of collection platform during collection event. IMU information allows the pulse vector to be properly placed in 3D space allowing the distance from the aircraft reference point to be properly positioned on the elevation model surface. IMU data is processed using the POSPac v4.2 software by Applanix Corporation of Richmond Hill, Ontario, Canada.

Process Date/Time: 2009-01-01 00:00:00

Process Step 4

CC ID: 1145146
Description:

LiDAR point classification

The classification and quality control (QC) of LiDAR data is carried out using TerraScan software v. 8.003 by Terrasolid Limited of Helinski, Finland. The bare earth extraction from the point cloud is the result of a morphological processing routine run in TerraScan. A set of user-defined distances and angles are used by the software to build a ground surface from established 'aerial low seed points'. The reclassifying of the data in areas of overlapping scans is done before the classification of the LAS ground points (DEM). This means the point cloud from which the ground points are extracted is more uniform in terms of point density.

The 'cut-overlap' process is performed with the aid of the aircraft trajectory (reduced to the sensor's trajectory) and the scan angle value within the LAS data. For this project, the value used for cutting the overlap was 25 degrees. This means that data from a single scan greater than 12.5 degrees off nadir was classified to class 12 overlap. Using the trajectory and embedded angle information, the software (TerraScan) is able to properly reclassify the overlap points so that the remaining point cloud is edge-matched. That is to say, there are no data voids within the point cloud with class 12 overlap points turned off.

Process Date/Time: 2009-01-01 00:00:00

Process Step 5

CC ID: 1145147
Description:

Output LAS files

The tiling and final LAS file creation was performed using LiDAR CuePac v5.0 from GeoCue Corporation of Madison, Alabama, USA. By client specification, the LiDAR point cloud data were cut to square, 750 x 750 meter (~56 Ha, 140 acres) tiles. The naming convention used for the tiles is based on the truncated grid coordinate at the southwest corner point of origin of the tile.

Process Date/Time: 2009-01-01 00:00:00

Process Step 6

CC ID: 1145148
Description:

Summary and algorithms for filtering data:

The classification algorithms used on the LiDAR point cloud involved several iterative steps including the removal of low points and other outlyers, the culling of overlap data, and finally the classification of the LiDAR DEM. This process begins with automated routines and ends with a 100% manual edit and QC check of the data. Once the data set classification accuracy was deemed sufficient and no quality issues were found, a final vertical accuracy assessment was performed on the LiDAR DEM.

Process Date/Time: 2009-01-01 00:00:00

Process Step 7

CC ID: 1145149
Description:

Data Validation -

The final LiDAR LAS 1.1 was created in UTM Zone 18 North, referenced to NAD83 and NAVD 88, in meters. The final LiDAR DEM was verified against FEMA checkpoints in order to perform a redundency check against the GPS solutions. These accuracy checks also verified that the data meets the guidelines outlined in FEMA's Guidelines and Specifications for Flood Hazard Mapping Partners and Appendix 4B, Airborne Light Detection and Ranging Systems.

Process Date/Time: 2009-01-01 00:00:00

Process Step 8

CC ID: 1145150
Description:

NOAA OCM received the lidar data in 8,909 LAS format binary files. No project report was delivered with the data. The data were in UTM Zone 18N NAD83 meters coordinates and NAVD88 (Geoid03) elevations in meters.

1. An internal OCM script was run to check the number of points by classification and by flight ID and the gps and intensity ranges. It was determined that, in addition to the lidar point classifications specified in the metadata of 1 - Unclassified, 2 - Bare Earth, 7 - Low Points (noise), and 12 - Overlap, classes 3 - Low Vegetaion, 4 - Medium Vegetation, 5 - High Vegetation and 6 - Building were also present.

2. Internal OCM scripts were run on the las files to convert to laz format, to convert from orthometric (NAVD88) elevations to NAD83 (2011) ellipsoid elevations using the Geoid 03 model, to convert from UTM Zone 18 North NAD83 (2007) coordinates in meters to geographic coordinates, to assign the geokeys, to sort the data by gps time and zip the data to database and to http. All point classifications were processed through.

Process Date/Time: 2020-10-04 00:00:00
Process Contact: Office for Coastal Management (OCM)

Catalog Details

Catalog Item ID: 63037
GUID: gov.noaa.nmfs.inport:63037
Metadata Record Created By: Blake Waring
Metadata Record Created: 2020-10-04 16:42+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2023-10-17 16:12+0000
Metadata Record Published: 2022-03-16
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2022-03-16
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2023-03-16