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Data Set Info
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Data Quality
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Related Items
Catalog Details

Summary

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Short Citation
OCM Partners, 2024: 2017 Lidar (8 PPSM): Eastern Maine - Merrymeeting Bay, https://www.fisheries.noaa.gov/inport/item/56959.
Full Citation Examples

Abstract

Product: These LiDAR data are 19 classified LAS 1.4 files; used to create intensity images, 3D breaklines and hydro-flattened DEMs as necessary.

Geographic Extent: Merrymeeting Bay, ME in Sagadahoc County, covering approximately 2 square miles.

Data set Description: This data set covers a small area in southern Maine, that was collected at the same time as a much larger data set in eastern Maine, but is provided at 8 points per square meter. There is also a data set for the same area that is provided at 16 points per square meter. See the Related Items section of this metadata record for a link to that data set metadata record. Additionally, the hydro breaklines and the Digital Elevation Model (DEM) data created from these 19 lidar files are also available. See the URL section of this metadata record for a link to the hydro breaklines and the Related Item section for a link to the DEM data metadata record. A link to metadata for the larger data set, 2017 Lidar: Eastern Maine, is also provided in the Related Item section.

The 2017 Eastern Maine 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 was developed based on a horizontal projection/datum of NAD83 (2011) UTM Zone 19, meters and vertical datum of NAVD88 (GEOID12B), meters.

Ground Conditions: LiDAR was collected in the spring and fall of 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 181 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 301 independent accuracy checkpoints, 178 in Bare Earth and Urban landcovers (178 NVA points), 123 in Forested, Shrubs, and Tall Weeds categories (123 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.

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.

  • 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.

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

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

-69.901956° W, -69.867084° E, 44.004341° N, 43.951092° S

Time Frame 1
2017-04-30

Item Identification

Title: 2017 Lidar (8 PPSM): Eastern Maine - Merrymeeting Bay
Short Name: me2017_mmtgbay_8ppsm_m8772.xml
Status: Completed
Creation Date: 2019-07-17
Publication Date: 2018-03-30
Abstract:

Product: These LiDAR data are 19 classified LAS 1.4 files; used to create intensity images, 3D breaklines and hydro-flattened DEMs as necessary.

Geographic Extent: Merrymeeting Bay, ME in Sagadahoc County, covering approximately 2 square miles.

Data set Description: This data set covers a small area in southern Maine, that was collected at the same time as a much larger data set in eastern Maine, but is provided at 8 points per square meter. There is also a data set for the same area that is provided at 16 points per square meter. See the Related Items section of this metadata record for a link to that data set metadata record. Additionally, the hydro breaklines and the Digital Elevation Model (DEM) data created from these 19 lidar files are also available. See the URL section of this metadata record for a link to the hydro breaklines and the Related Item section for a link to the DEM data metadata record. A link to metadata for the larger data set, 2017 Lidar: Eastern Maine, is also provided in the Related Item section.

The 2017 Eastern Maine 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 was developed based on a horizontal projection/datum of NAD83 (2011) UTM Zone 19, meters and vertical datum of NAVD88 (GEOID12B), meters.

Ground Conditions: LiDAR was collected in the spring and fall of 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 181 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 301 independent accuracy checkpoints, 178 in Bare Earth and Urban landcovers (178 NVA points), 123 in Forested, Shrubs, and Tall Weeds categories (123 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.

Purpose:

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 DEMs. The purpose of these LiDAR data was to produce high accuracy 3D hydro-flattened digital elevation models (DEMs) with a 1-meter cell size. These raw LiDAR point cloud data were used to create classified LiDAR LAS files, intensity images, 3D breaklines, and hydro-flattened DEMs as necessary.

Supplemental Information:

State of Maine DO#: DO 18B 20170322000000008328 MPA#: MA 18P 16041900000000000157. CONTRACTOR: Quantum Spatial, Inc. SUBCONTRACTOR: Keystone Aerial Surveys, Inc. and Aeroptic, LLC. LiDAR data were acquired by Quantum Spatial, Inc., Keystone Aerial Surveys, Inc., and Aeroptic, LLC. All follow-on processing was completed by the prime contractor.

The following are the USGS lidar fields in JSON:

{

"ldrinfo" : {

"ldrspec" : "USGS-NGP Base Specification v1.2",

"ldrsens" : "Leica ALS 70",

"ldrmaxnr" : "Unlimited",

"ldrnps" : "0.61",

"ldrdens" : "2.21",

"ldranps" : "0.61",

"ldradens" : "2.21",

"ldrfltht" : "2100",

"ldrfltsp" : "140",

"ldrscana" : "36",

"ldrscanr" : "56",

"ldrpulsr" : "262.6",

"ldrpulsd" : "4",

"ldrpulsw" : "0.22",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.22",

"ldrswatw" : "1364.66",

"ldrswato" : "30",

"ldrgeoid" : "GEOID12B",

"ldrcrs" : "NAD 1983 (2011) UTM Zone 19 Meters"

},

"ldrinfo_2" : {

"ldrspec" : "USGS-NGP Base Specification v1.2",

"ldrsens" : "Leica ALS 80",

"ldrmaxnr" : "Unlimited",

"ldrnps" : "0.61",

"ldrdens" : "2.21",

"ldranps" : "0.61",

"ldradens" : "2.21",

"ldrfltht" : "2478",

"ldrfltsp" : "140",

"ldrscana" : "36",

"ldrscanr" : "33.5",

"ldrpulsr" : "484",

"ldrpulsd" : "3",

"ldrpulsw" : "0.25",

"ldrwavel" : "1064",

"ldrmpia" : "0",

"ldrbmdiv" : "0.25",

"ldrswatw" : "1610.30",

"ldrswato" : "30",

"ldrgeoid" : "GEOID12B",

"ldrcrs" : "NAD 1983 (2011) UTM Zone 19 Meters"

},

"ldrinfo_3" : {

"ldrspec" : "USGS-NGP Base Specification v1.2",

"ldrsens" : "Riegl 1560i",

"ldrmaxnr" : "Unlimited",

"ldrnps" : "0.70",

"ldrdens" : "2.03",

"ldranps" : "0.70",

"ldradens" : "2.03",

"ldrfltht" : "1829",

"ldrfltsp" : "150",

"ldrscana" : "58.52",

"ldrscanr" : "210",

"ldrpulsr" : "700",

"ldrpulsd" : "3",

"ldrpulsw" : "0.25",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.25",

"ldrswatw" : "2049",

"ldrswato" : "30",

"ldrgeoid" : "GEOID12B",

"ldrcrs" : "NAD 1983 (2011) UTM Zone 19 Meters"

},

"ldraccur" : {

"ldrchacc" : "0.196",

"rawnva" : "0.100",

"rawnvan" : "178"

},

"lasinfo" : {

"lasver" : "1.4",

"lasprf" : "6",

"laswheld" : "Withheld (ignore) points were identified in these files using the standard LAS Withheld bit",

"lasolap" : "Swath "overage" points were identified in these files using the standard LAS overlap bit",

"lasintr" : "16",

"lasclass" : {

"clascode" : "1",

"clasitem" : "Processed, but Unclassified"

},

"lasclass" : {

"clascode" : "2",

"clasitem" : "Bare-Earth Ground"

},

"lasclass" : {

"clascode" : "7",

"clasitem" : "Low Noise"

},

"lasclass" : {

"clascode" : "9",

"clasitem" : "In-land Water"

},

"lasclass" : {

"clascode" : "10",

"clasitem" : "Ignored Ground"

},

"lasclass" : {

"clascode" : "17",

"clasitem" : "Bridge Decks"

},

"lasclass" : {

"clascode" : "18",

"clasitem" : "High Noise"

}

}}

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
ISO 19115 Topic Category
elevation
UNCONTROLLED
None beach
None erosion

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MAINE
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > LAND SURFACE

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: LiDAR point cloud
Distribution Liability:

In no event shall the creators, custodians, or distributors of these data be liable for any damages arising out of its use, or from the inability of the customer to use these data for their intended application.

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

Data Set Credit: Quantum Spatial, Inc.

Support Roles

Data Steward

CC ID: 863383
Date Effective From: 2019
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: 863384
Date Effective From: 2019
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: 863385
Date Effective From: 2019
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: 863386
Date Effective From: 2019
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: 1142386
W° Bound: -69.901956
E° Bound: -69.867084
N° Bound: 44.004341
S° Bound: 43.951092

Extent Group 1 / Time Frame 1

CC ID: 1142385
Time Frame Type: Discrete
Start: 2017-04-30

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Reference Systems

Reference System 1

CC ID: 1142383

Coordinate Reference System

CRS Type: Geographic 3D
EPSG Code: EPSG:6319
EPSG Name: NAD83(2011)
See Full Coordinate Reference System Information

Access Information

Security Class: Unclassified
Data Access Procedure:

Data is available online for bulk and 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: 863390
Start Date: 2019-07-17
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8772
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2019 - 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.

File Type (Deprecated): Zip
Compression: Zip

Distribution 2

CC ID: 863391
Start Date: 2019-07-17
End Date: Present
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8772/index.html
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2019 - 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.

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

URLs

URL 1

CC ID: 863381
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: 863382
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8772/supplemental/me2017_mmtgbay_8ppsm_m8772.kmz
Name: Browse graphic
URL Type:
Browse Graphic
File Resource Format: KML
Description:

This graphic displays the footprint for this lidar data set.

URL 3

CC ID: 863765
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8772/supplemental/Final_Maine_Survey_Report.pdf
URL Type:
Online Resource
Description:

Link to the survey report.

URL 4

CC ID: 863766
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8772/supplemental/FOCUSonAcc_Maine_2017_LiDAR_20180424_115518.pdf
URL Type:
Online Resource
Description:

Link to the FOCUS Accuracy report.

URL 5

CC ID: 863767
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8772/supplemental/Maine_2017_LiDAR_FOCUS_Report.pdf
URL Type:
Online Resource
Description:

Link to the FOCUS report.

URL 6

CC ID: 863768
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8772/supplemental/Maine_ProjectReport_Deliverable.pdf
URL Type:
Online Resource
Description:

Link to the Project report.

URL 7

CC ID: 863870
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8772/breaklines/
URL Type:
Online Resource
Description:

Link to the hydro breaklines.

Data Quality

Horizontal Positional Accuracy:

Not provided.

Vertical Positional Accuracy:

The project specifications require that only Non-Vegetated Vertical Accuracy (NVA) be computed for raw lidar point cloud swath files. The required accuracy (ACCz) is: 19.6 cm at a 95% confidence level, derived according to NSSDA, i.e., based on RMSE of 10 cm in the bare earth and urban land cover classes. The NVA was tested with 176 checkpoints located in bare earth and urban (non-vegetated) areas. These check points were not used in the calibration or post processing of the lidar point cloud data. The checkpoints were distributed throughout the project area and were surveyed using GPS techniques. See survey report for additional survey methodologies.

Elevations from the unclassified lidar surface were measured for the x,y location of each check point. Elevations interpolated from the lidar surface were then compared to the elevation values of the surveyed control points. AccuracyZ has been tested to meet 19.6 cm or better Non-Vegetated Vertical Accuracy at 95% confidence level using RMSE(z) x 1.9600 as defined by the

National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASRPS Guidelines.

The Non Vegetated Vertical Accuracy (NVA) for the Point Cloud is 5.05 cm RMSE (9.90 cm at 95% confidence level) based on 176 check points.

Completeness Report:

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. No void areas or missing data exist. The raw point cloud is of good quality and data passes Non-Vegetated Vertical Accuracy specifications.

Conceptual Consistency:

Data covers the entire area specified for this project.

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

Lineage Statement:

Quantum Spatial collected Light Detection and Ranging (LIDAR) data in Maine for the State of Maine.

NOAA OCM received the data and ingested it into the Digital Coast Data Access Viewer for distribution.

Process Steps

Process Step 1

CC ID: 1142381
Description:

LAS Point Classification: The point classification is performed as described below. The bare earth surface is then manually reviewed to ensure correct classification on the Class 2 (Ground) points. After the bare-earth surface is finalized, it is then used to generate all hydro-breaklines through heads-up digitization. All ground (ASPRS Class 2) LiDAR data inside of the Lake Pond and Double Line Drain hydro-flattened breaklines were then classified to Water (ASPRS Class 9) using TerraScan macro functionality. A buffer of 1 meter was also used around each hydro-flattened feature to classify these ground (ASPRS Class 2) points to Ignored ground (ASPRS Class 10). All Lake Pond Island and Double Line Drain Island features were checked to ensure that the ground (ASPRS Class 2) points were reclassified to the correct classification after the automated classification was completed. ASPRS Class 7 was used for all low nois points while ASPRS Class 18 was used for all high noise points. Bridge decks were classified to ASPRS Class 17. All overlap data was processed through automated functionality provided by TerraScan to classify the overlapping flight line data to approved classes by USGS. The overlap data was classified using standard LAS overlap bit. These classes were created through automated processes only and were not verified for classification accuracy. Due to software limitations within TerraScan, these classes were used to trip the withheld bit within various software packages. These processes were reviewed and accepted by USGS through numerous conference calls and pilot study areas. All data was manually reviewed and any remaining artifacts removed using functionality provided by TerraScan and TerraModeler. Global Mapper is used as a final check of the bare earth dataset. GeoCue was then used to create the deliverable industry-standard LAS files for both the All Point Cloud Data and the Bare Earth. Quantum Spatial, Inc. proprietary software was used to perform final statistical analysis of the classes in the LAS files, on a per tile level to verify final classification metrics and full LAS header information.

Process Date/Time: 2017-01-01 00:00:00

Process Step 2

CC ID: 1142382
Description:

The NOAA Office for Coastal Management (OCM) received 19 laz 1.4 format files from the State of Maine GIS. The files contained lidar elevation and intensity measurements. The data were in UTM Zone 19 NAD83(2011) meters coordinates and NAVD88 (Geoid12b) elevations in meters. The lidar classes available are: 1 (Unclassified), 2 (Ground), 7 (Low Noise), 9 (Inland Water), 10 (Ignored Ground), 17 (Bridge Decks), 18 (High Noise). OCM did the following processing to the data for Digital Coast storage and provisioning purposes:

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.

2. Internal OCM scripts were run on the laz files to convert from orthometric (NAVD88) elevations to NAD83 (2011) ellipsoid elevations using the Geoid 12b model, to convert from UTM Zone 19 North NAD83 (2011) 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.

Process Date/Time: 2019-07-17 00:00:00
Process Contact: Office for Coastal Management (OCM)

Related Items

Item Type Relationship Type Title
Data Set (DS) Cross Reference 2017 Lidar (16 PPSM): Eastern Maine - Merrymeeting Bay

Catalog Details

Catalog Item ID: 56959
GUID: gov.noaa.nmfs.inport:56959
Metadata Record Created By: Rebecca Mataosky
Metadata Record Created: 2019-07-17 13:49+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