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Short Citation:
OCM Partners, 2022: 2004 ENSR Bare Earth Topographic Lidar: Hampden County, Massachusetts, https://www.fisheries.noaa.gov/inport/item/49768.

Item Identification

Title: 2004 ENSR Bare Earth Topographic Lidar: Hampden County, Massachusetts
Short Name: ma2004_ensr_hampden_m2577_metadata
Status: Completed
Publication Date: 2013-10
Abstract:

Spectrum Mapping was tasked by ENSR International (now a subsidiary of AECOM Technology Corporation) to collect LIDAR data and digital

ortho imagery to generate breaklines and a bare earth DEM to support 2-foot contour intervals in accordance with FEMA Appendix A.

The project area for Connecticut River floodplain was approximately 143 square miles in Hampden County, Massachusetts. The

Spectrum aircraft was equipped with the RAMS system, including a 26 Khz Laser, an inertial measurement unit (IMU), and a dual

frequency GPS receiver and antenna. The RAMS sensor system also includes a RAMS 4K X 4K color digital camera mounted to the

LIDAR unit.

Purpose:

The purpose of this project was to collect LIDAR data and digital ortho imagery to generate breaklines and a bare earth DEM to

support 2-foot contour intervals in ccordance with FEMA Appendix A.

Notes:

10412

Supplemental Information:

A footprint of this data set may be viewed in Google Earth at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2577/supplemental/ma2004_ensr_hampden_footprint.kmz

A Lidar Report from the vendor for this data set may be viewed here:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2577/supplemental/ma2004_ensr_hampden_projectreport.pdf

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
None ASCII
None Bare Earth
None LAZ

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: As Needed
Data Presentation Form: las
Entity Attribute Overview:

LiDAR points in LAZ format (ASPRS Class 2)

Entity Attribute Detail Citation:

none

Distribution Liability:

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

ENSR International (AECOM Technology Corporation), Spectrum Mapping, NOAA,

the Office for Coastal Management or its partners.

Data Set Credit: Please credit ENSR International and Spectrum Mapping LLC for all products derived from this data.

Support Roles

Data Steward

CC ID: 676258
Date Effective From: 2013-10
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: 676260
Date Effective From: 2013-10
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: 676261
Date Effective From: 2013-10
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: 676259
Date Effective From: 2013-10
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: 1134731
W° Bound: -72.868349
E° Bound: -72.253597
N° Bound: 42.28869
S° Bound: 42.01977

Extent Group 1 / Time Frame 1

CC ID: 1134730
Time Frame Type: Range
Start: 2004-05-13
End: 2004-06-03

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/#/lidar/search/where:ID=2577

;

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. These data depict the heights at the time of the survey and are only accurate for that time.

Distribution Information

Distribution 1

CC ID: 741234
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2577
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: 741235
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2577/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 741237
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 741238
URL: https://coast.noaa.gov
URL Type:
Online Resource

URL 3

CC ID: 741239
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2577/supplemental/ma2004_ensr_hampden_footprint.kmz
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic shows the lidar coverage for Hampden County, Massachusetts.

Activity Log

Activity Log 1

CC ID: 676279
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 676278
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: 718335
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 741236
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Accuracy:

Elevations are recorded in floating-point meters and the vertical datum is ellipsoidal (GEOID99).

Horizontal Positional Accuracy:

Project specifications required a horizontal accuracy of 1.0 meter or greater in order to meet FEMA guidelines for Lidar-based DEMs.

Vertical Positional Accuracy:

Green International Affiliates, Inc collected the 48 control points used below for the RMSE of the project areas. The RMSE below is

combined for the Massachusetts and Connecticut project areas. The final RMSEz is 14.7 centimeters (.483 feet). This exceeds the FEMA

Guidelines and Specifications for Flood Hazard Mapping.

; Quantitative Value: 0.147 meters, Test that produced the value: Root mean square Z error in bare areas. Units in meters.

Completeness Report:

Elevation data has been collected for all areas inside project boundaries. The data set was flown with a 30% sidelap between flightlines. As

part of the field QC process, data voids caused by operational errors are re-collected if required. Spectrum Mapping found no data voids in this

project.

Conceptual Consistency:

Spectrum Mapping performs rigorous quality assurance program insures that the final data products meet all requirements prior to delivery

to the customer. Quality Assurance / Quality Control is embedded into the overall data acquisition and processing steps. Quality

assurance is inherent in developing the project plan, acquisition, verifying data and processing, and assuring that the final products

meet all FEMA requirements in accordance with the contract. Spectrum Mapping's quality assurance procedures follow the "FEMA Guidelines and

Specifications for Flood Hazard Mapping Partners, Appendix A: Guidance for Aerial Mapping and Surveying" for use of LIDAR mapping technology.

Lineage

Process Steps

Process Step 1

CC ID: 1134727
Description:

Detailed information about Spectum Mapping's data processing procedures can be found in the Project Report located above in the

Supplemental_Information section.

Process Date/Time: 2004-01-01 00:00:00

Process Step 2

CC ID: 1134728
Description:

The NOAA Office for Coastal Management (OCM) received topographic files in ASCII .CSV format. The files contained bare earth lidar elevation

measurements in X,Y,Z format. The data were received in Massachusetts State Plane Mainland Zone 2001, NAD83 coordinates and were vertically

referenced to NAVD88 using the Geoid99 model. The vertical units of the data were feet. OCM performed the following processing for data storage

and Digital Coast provisioning purposes:

1. The topographic las files were converted from ASCII to LAS format.

2. The classification of all bare earth points was changed from Class 0 to Class 2.

3. The topographic las files were converted from orthometric (NAVD88) heights to ellipsoidal heights using Geoid99.

4. The topographic las files were converted from a Projected Coordinate System (MA SP Mainland) to a Geographic Coordinate System (NAD83).

5. The topographic las files' vertical units were converted from feet to meters.

6. The topographic las files' horizontal units were converted from feet to decimal degrees.

Process Date/Time: 2013-10-01 00:00:00

Catalog Details

Catalog Item ID: 49768
GUID: gov.noaa.nmfs.inport:49768
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