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Short Citation:
OCM Partners, 2022: 2008 FEMA Bare-Earth Lidar: West Creek, Schoharie County (NY), https://www.fisheries.noaa.gov/inport/item/49884.

Item Identification

Title: 2008 FEMA Bare-Earth Lidar: West Creek, Schoharie County (NY)
Short Name: ny2008_fema_schoharie_be_m5043_metadata
Status: Completed
Publication Date: 2008-08
Abstract:

Terrain data, as defined in FEMA Guidelines and Specifications, Appendix N: Data Capture Standards, describes the digital topographic data that was used to create the elevation data representing the terrain environment of a watershed and/or floodplain. Terrain data requirements allow for flexibility in the types of information provided as sources used to produce final terrain deliverables. Once this type of data is provided, FEMA will be able to account for the origins of the flood study elevation data.

(Source: FEMA Guidelines and Specifications, Appendix N, Section N.1.2).

Reflective surface data represents the DEM created by laser energy reflected from the first

surface encountered by the laser pulse. Some energy may continue beyond this initial surface to be reflected by a subsequent surface as represented by the Last Return data. Intensity information is captured from the Reflective Surface pulse and indicates the relative energy returned to the sensor as compared to the energy transmitted. The Intensity image is not calibrated or normalized but indicates differences in energy absorption due to the interaction of the surface materials with laser energy at the wavelength transmitted by the sensor.

Purpose:

LIDAR data is used for 3D visualization, elevation based analysis and for feature extraction.

Notes:

10528

Supplemental Information:

A final footprint for the 2008 Schoharie Bare Earth project area vist here:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/5043/supplemental/ny2008_fema_be_schoharie_m5043.kmz

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: Unknown
Entity Attribute Overview:

LAS 1.2 format (class 2 only)

Entity Attribute Detail Citation:

none

Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of the

Federal Emergency Management Agency (FEMA), Sanborn Map Company, Inc, Medina Consultants, the Office for Coastal Management or its partners.

Data Set Credit: Acknowledgement of the Federal Emergency Management Agency (FEMA), Sanborn Map Company, Inc, and Medina Consultants would be appreciated in products derived from these data.

Support Roles

Data Steward

CC ID: 681816
Date Effective From: 2008-08
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: 681818
Date Effective From: 2008-08
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: 681819
Date Effective From: 2008-08
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: 681817
Date Effective From: 2008-08
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: 1137912
W° Bound: -74.73
E° Bound: -74.306
N° Bound: 42.835
S° Bound: 42.56

Extent Group 1 / Time Frame 1

CC ID: 1137911
Time Frame Type: Discrete
Start: 2008-09-12

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Access Information

Security Class: Unclassified
Data Access Procedure:

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer

The data set is dynamically generated based on user-specified parameters.

;

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: 741882
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=5043
Distributor:
File Name: Customized Download
Description:

Create custom data files by choosing data area, product type, map projection, file format, datum, etc.

Distribution 2

CC ID: 741883
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/5043/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 741885
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 741886
URL: https://coast.noaa.gov
URL Type:
Online Resource

URL 3

CC ID: 741887
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/5043/supplemental/ny2008_fema_be_schoharie_m5043.kmz
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

Footprint representing the 2008 West Creek, Schoharie County bare earth lidar.

Activity Log

Activity Log 1

CC ID: 681836
Activity Date/Time: 2016-06-14
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 681835
Activity Date/Time: 2017-11-14
Description:

Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 718464
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 741884
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Technical Environment

Description:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.4.1420

Data Quality

Horizontal Positional Accuracy:

Contracted to meet 1 meter (RMSE) horizontal accuracy.

Vertical Positional Accuracy:

LiDAR data accuracy determination shall employ the National Standard for Spatial Data Accuracy (NSSDA). Contracted to meet 18.5cm (RMSE) on open bare terrain and 37.0cm for obscured areas.

Completeness Report:

LIDAR raster data is visually inspected for completeness to ensure that any gaps between flight lines

or loss of signal represents less than 5% of required collection area. LIDAR is self-illuminating and has minimal cloud penetration capability. Water vapor in steam plumes or particulates in smoke may cause reflection of LIDAR signals and loss of elevation information beneath these plumes. Glass structures and roofs may appear transparent to the LIDAR signal and therefore may not register on the reflective surface. Some asphalt formulations have been shown to absorb topographic LIDAR wavelength energy resulting in "pitting" of roof surfaces using this material.

Conceptual Consistency:

All LAS formatted LIDAR data are validated using commercial GIS software to ensure proper formatting and loading before delivery. This validation procedure ensures that data on delivery media is in correct physical format and is readable.

Lineage

Sources

LiDAR

CC ID: 1137904
Publish Date: 2008-01-01
Extent Type: Discrete
Extent Start Date/Time: 2008
Source Contribution:

Raw spatial elevation information | Type of Source Media: Hard drive

Process Steps

Process Step 1

CC ID: 1137905
Description:

Data Collection: Using an Leica Geosystems ALS50 Laser Systems, 89 flight lines with a nominal

point spacing = 1.4 meters (4.59 feet) were collected over Erie County, NY (approximately 1044 square miles). Multiple

returns were recorded for each laser pulse along with an intensity value for each return. The data acquisition occurred

in missions on April 17, 2008 and April 28, 2008. During the LIDAR campaign, the field crew conducted a GPS field survey

to establish final coordinates of the ground base stations for final processing of the base-remote GPS solutions.

Process Date/Time: 2008-09-01 00:00:00

Process Step 2

CC ID: 1137906
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 reflective surface for each flight line. The overlap between flight lines was removed to

provide a homogeneous coverage, and the coverage was classified to extract a bare earth digital elevation model (DEM).

Airborne GPS is differentially processed using the GrafNAV V7.50 software by Waypoint Consulting of Calgary, Alberta,

Canada. IMU data is processed using the PosPac V4.2 software by Applanix Corporation of Richmond Hill, Ontario, Canada.

The reflective surface is derived using the ALS Post Processor software by Leica Geosystems GIS & Mapping Division of

Atlanta, Georgia. The classification and quality control (QC) of LiDAR data is carried out using TerraScan software

by Terrasolid Limited of Helsinki, Finland.

Process Date/Time: 2008-09-01 00:00:00

Process Step 3

CC ID: 1137907
Description:

LIDAR Ground Point Classification: The classification and quality control (QC) of LiDAR Ground

point class is carried out using TerraScan software by Terrasolid Limited of Helsinki, Finland. In the filtering

process points are classified as Ground or non-Ground classes (Unclassified).

Process Date/Time: 2008-10-01 00:00:00

Process Step 4

CC ID: 1137908
Description:

Output: LAS Files LIDAR points in 1.0 format; ASCII (e,n,z,i) for first return and last return;

ESRI GRID for Bare Earth; GeoTiff (8-bit, single band) Intensity Images.

Process Date/Time: 2008-10-01 00:00:00

Process Step 5

CC ID: 1137909
Description:

The NOAA Office for Coastal Management (OCM) received the files in a shapefile as points with a z value associated as elevation, referenced to a Universal Transverse Mercator cooridinate system, zone 16 N in meters and referenced to the NAVD88 Geoid 03 vertical datum with vertical units of measure of meters.

OCM performed the following processing to the data to make it available within the Digital Coast:

1. Converted from UTM coordinates to geographic coordinates in decimal degrees.

2. The data were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoid) heights using Geoid 03.

3. The data were filtered to remove outliers.

4. Provided metadata referenced a 5 and 10 m DEM product therefore metadata intricacies were derived from similar project metadata and an in-depth search for relevant 2008 project information.

Process Date/Time: 2016-06-09 00:00:00

Catalog Details

Catalog Item ID: 49884
GUID: gov.noaa.nmfs.inport:49884
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:22+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+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