Lidar for the Pocomoke and Atlantic Coastal Watersheds in Maryland
Data Set (DS) | OCM Partners (OCMP)GUID: gov.noaa.nmfs.inport:51633 | Updated: October 17, 2023 | Published / External
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Summary
Short Citation
OCM Partners, 2025: Lidar for the Pocomoke and Atlantic Coastal Watersheds in Maryland, https://www.fisheries.noaa.gov/inport/item/51633.
Full Citation Examples
This Light Detection and Ranging (LiDAR) dataset is a survey of the Pocomoke and Atlantic Coastal Watersheds in Maryland. The project area consists of approximately 500 square miles. The project design of the LiDAR data acquisition was developed to support a nominal post spacing of 0.70 meter. Fugro EarthData, Inc. acquired 151 flight lines in eight lifts on February 6, 7, 9, 13, 15, and 16, 2011; in tidal areas, data was collected within 2 hours (before or after) of mean low tide. The data was divided into 1500 by 1500 meter cells that serve as the tiling scheme. LiDAR data collection was performed with a Piper Navajo twin engine aircraft, utilizing a Leica ALS60 MPiA sensor, collecting multiple return x, y, and z as well as intensity data. LiDAR data is remotely sensed high-resolution elevation data collected by an airborne collection platform. This data of the Pocomoke and Atlantic Coastal Watersheds in Maryland, was collected at sufficient resolution to provide a nominal point spacing of 0.70 meter for collected points. Up to 4 returns were recorded for each pulse in addition to an intensity value.
Distribution Information
-
LAS/LAZ - LASer
Customizable download of point cloud data and derived products.
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of this data may no longer represent actual surface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.
Controlled Theme Keywords
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
https://coast.noaa.gov
Metadata Contact
Office for Coastal Management (OCM)
https://www.coast.noaa.gov/
Extents
-75.691501° W,
-75.225534° E,
38.453581° N,
37.952398° S
2011-02 - 2011-06
Item Identification
Title: | Lidar for the Pocomoke and Atlantic Coastal Watersheds in Maryland |
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Short Name: | 2011 USDA lidar: Pocomoke and Atlantic Coastal |
Status: | Completed |
Publication Date: | 2018 |
Abstract: |
This Light Detection and Ranging (LiDAR) dataset is a survey of the Pocomoke and Atlantic Coastal Watersheds in Maryland. The project area consists of approximately 500 square miles. The project design of the LiDAR data acquisition was developed to support a nominal post spacing of 0.70 meter. Fugro EarthData, Inc. acquired 151 flight lines in eight lifts on February 6, 7, 9, 13, 15, and 16, 2011; in tidal areas, data was collected within 2 hours (before or after) of mean low tide. The data was divided into 1500 by 1500 meter cells that serve as the tiling scheme. LiDAR data collection was performed with a Piper Navajo twin engine aircraft, utilizing a Leica ALS60 MPiA sensor, collecting multiple return x, y, and z as well as intensity data. LiDAR data is remotely sensed high-resolution elevation data collected by an airborne collection platform. This data of the Pocomoke and Atlantic Coastal Watersheds in Maryland, was collected at sufficient resolution to provide a nominal point spacing of 0.70 meter for collected points. Up to 4 returns were recorded for each pulse in addition to an intensity value. |
Purpose: |
The data was collected for the NRCS, whose mission is Helping People Help the Land. NRCS provides products and services that enable people to be good stewards of their soil, water, and related natural resources. With their assistance, people are better able to conserve, maintain, or improve their natural resources. |
Notes: |
Obtained by NOAA from the Maryland iMAP system (imap.maryland.gov). |
Keywords
Theme Keywords
Thesaurus | Keyword |
---|---|
ISO 19115 Topic Category |
elevation
|
UNCONTROLLED | |
None | bare earth |
None | bare ground |
None | high-resolution |
None | Light Detection and Ranging |
Spatial Keywords
Thesaurus | Keyword |
---|---|
UNCONTROLLED | |
Geographic Names Information System | Maryland |
Geographic Names Information System | Pocomoke and Atlantic Coastal Watersheds |
Physical Location
Organization: | Office for Coastal Management |
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City: | Charleston |
State/Province: | SC |
Data Set Information
Data Set Scope Code: | Data Set |
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Data Set Type: | GIS Files |
Maintenance Frequency: | As Needed |
Data Presentation Form: | Map (digital) |
Entity Attribute Overview: |
Lidar point cloud x,y,z and intensity data with classification scheme: 1 = undefined, 2 = ground, 7 = low noise, 9 = water, 10 = ignored ground, 11 = withheld |
Distribution Liability: |
Any conclusions drawn from the analysis of this information are not the responsibility of the State of Maryland, the Office for Coastal Management or its partners. |
Data Set Credit: | Fugro Earthdata, USDA-NRCS |
Support Roles
Data Steward
Date Effective From: | 2018-02-26 |
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Date Effective To: | |
Contact (Organization): | Office for Coastal Management (OCM) |
Address: |
2234 South Hobson Avenue Charleston, SC 29405-2413 |
URL: | https://www.coast.noaa.gov/ |
Distributor
Date Effective From: | 2018-02-26 |
---|---|
Date Effective To: | |
Contact (Organization): | Office for Coastal Management (OCM) |
Address: |
2234 South Hobson Avenue Charleston, SC 29405-2413 |
URL: | https://www.coast.noaa.gov/ |
Metadata Contact
Date Effective From: | 2018-02-26 |
---|---|
Date Effective To: | |
Contact (Organization): | Office for Coastal Management (OCM) |
Address: |
2234 South Hobson Avenue Charleston, SC 29405-2413 |
URL: | https://www.coast.noaa.gov/ |
Point of Contact
Date Effective From: | 2018-02-26 |
---|---|
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 |
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Extent Group 1
Extent Group 1 / Geographic Area 1
W° Bound: | -75.691501 | |
---|---|---|
E° Bound: | -75.225534 | |
N° Bound: | 38.453581 | |
S° Bound: | 37.952398 |
Extent Group 1 / Time Frame 1
Time Frame Type: | Range |
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Start: | 2011-02 |
End: | 2011-06 |
Spatial Information
Spatial Resolution
Horizontal Distance: | 0.7 Meter |
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Spatial Representation
Representations Used
Vector: | Yes |
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Vector Representation 1
Point Object Present?: | Yes |
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Point Object Count: | 1149847022 |
Access Information
Security Class: | Unclassified |
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Data Access Procedure: |
Access via online tool |
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
Start Date: | 2018-03-14 |
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End Date: | Present |
Download URL: | https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8484 |
Distributor: | Office for Coastal Management (OCM) (2018-02-26 - Present) |
Description: |
Customizable download of point cloud data and derived products. |
File Type (Deprecated): | LAZ |
Distribution Format: | LAS/LAZ - LASer |
Compression: | Zip |
URLs
URL 1
URL: | https://coast.noaa.gov/digitalcoast |
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Name: | Digital Coast |
URL Type: |
Online Resource
|
URL 2
URL: | http://imap.maryland.gov/Pages/lidar-download-files.aspx |
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Name: | Maryland iMAP |
URL Type: |
Online Resource
|
Description: |
Location of the originating point clouds. |
Data Quality
Vertical Positional Accuracy: |
The minimum expected vertical accuracy was tested to meet or exceed the National Standard for Spatial Data Accuracy. When compared to GPS survey grade points in generally flat non-vegetated areas, at least 95% of the positions had an error less than or equal to 18 cm (equivalent to root mean square error of 9.25 cm if errors were normally distributed). |
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Data Management
Have Resources for Management of these Data Been Identified?: | Yes |
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Approximate Percentage of Budget for these Data Devoted to Data Management: | Unknown |
Do these Data Comply with the Data Access Directive?: | Yes |
Is Access to the Data Limited Based on an Approved Waiver?: | No |
Actual or Planned Long-Term Data Archive Location: | NCEI-CO |
Lineage
Lineage Statement: |
Original acquisition and processing of lidar data was completed by Fugro EarthData, Inc. and delivered to NRCS and Maryland. NOAA OCM obtained the data from Maryland iMAP and modified for ingest into the Digital Coast system. |
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Sources
Lidar data from Maryland iMAP
Extent Type: | Range |
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Extent Start Date/Time: | 2011-02-06 |
Extent End Date/Time: | 2011-02-16 |
Citation URL: | http://imap.maryland.gov/Pages/default.aspx |
Source Contribution: |
Point cloud data repository for Maryland |
Process Steps
Process Step 1
Description: |
Fugro EarthData utilized commercial software as well as proprietary software for automatic filtering. The parameters used in the process were customized for each terrain type to obtain optimum results. Once the automated filtering was completed, the files were run through a visual inspection to ensure that the filtering was not too aggressive or not aggressive enough. In cases where the filtering was too aggressive and important terrain features were filtered out, the data was either run through a different filter or was corrected during the manual filtering process. Interactive editing was then completed in 3D visualization software which also provides manual and automatic point classification tools. Vegetation and artifacts remaining after automatic data post-processing were reclassified manually through interactive editing. The hard edges of ground features that were automatically filtered out during the automatic filtering process were brought back into ground class during manual editing. Auto-filtering routines were utilized as much as possible within fenced areas during interactive editing for efficiency. The technician reviewed the LiDAR points with color shaded TINs for anomalies in ground class during interactive filtering. Upon the completion of peer review and finalization of bare earth filtering, the classified LiDAR point cloud work tiles went through a water classification routine. Upon the completion of finalization of the classified LiDAR point cloud work tiles, the tiles were reprojected to NAD83 (HARN), UTM zone 18 north, meters; NAVD88, meters, using GEOID09 and cut to the approved tile layout in LAS format. |
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Process Date/Time: | 2011-06-27 00:00:00 |
Process Step 2
Description: |
The hydrographic features were collected as vector linework using classified LiDAR datasets, intensity images, shaded-relief TIN surfaces, and contours. These features were classified as Inland Ponds and Lakes, Inland Streams and Rivers (single line), Inland Streams and Rivers (double line), Non-Tidal Boundary Waters, and Tidal Waters. After initial collection, linework was then checked for the following topological and attribution rules: non-bank lines must be digitized from an uphill to downhill direction, lines must be attributed with the correct feature code, dangles must exist only at the upstream headwater end of streams and at the downstream outfall, line intersections must be at nodes, non-bankline features must form a dendritic collection network, lakes that have a digitized inflow path must have a centerline as well, lakes that have a digitized outflow path but do not have a digitized inflow path should not have a centerline, isolated ponds that are not part of the drainage network should not have centerlines; lake and stream banklines must form closed polygons, single streams should not fall within bankline polygons and lake and stream connector lines should not fall outside of bankline polygons. Hydro features were collected as vector linework using LiDAR and its derived products listed above. This linework is initially 2D, meaning that it does not have elevation values assigned to individual line vertices. Vertex elevation values were assigned using a distance weighted distribution of LiDAR points closest to each vertex. After the initial 'drape', the linework elevation values were further adjusted based on the following rules: lake feature vertices were re-assigned (flattened) to lowest draped vertex value; lake connector line vertices were re-assigned (flattened) to lowest draped vertex value of the surrounding lake bankline, single stream and stream connector line vertices were adjusted so that subsequent vertices are lower than previous ones based on line direction, and double stream bankline vertices were re-assigned based on the vertices of the closest adjusted double stream connector line. After assignment of 3D values, the stream network is checked to ensure the following does not exist: large differences between initial drape and adjusted elevation values, elevation differences between nodes, and elevation values flowing in an 'uphill' direction. Data was provided to the terrain department for hydro-enforcement of the DEM. |
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Process Date/Time: | 2011-06-24 00:00:00 |
Process Step 3
Description: |
NOAA OCM downloaded the data from Maryland iMAP as zip files by Block. |
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Process Date/Time: | 2017-10-16 00:00:00 |
Process Contact: | Office for Coastal Management (OCM) |
Source: | Lidar data from Maryland iMAP |
Process Step 4
Description: |
Lidar data were changed from NAVD88 (Geoid09) vertical coordinates to ellipsoid heights using the GEOID09 grids. The class scheme was not described in the original metadata, but research on the related data for the Worcester coastal area suggests class 10 is ignored ground near breaklines and class 11 is withheld. Examination of the data supports that hypothesis. Data were then ingested into the Digital Coast Data Access Viewer system for distribution. |
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Process Date/Time: | 2018-02-26 00:00:00 |
Process Contact: | Office for Coastal Management (OCM) |
Acquisition Information
Instruments
Instrument 1
Identifier: | Leica ALS60 |
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Instrument / Gear: | Instrument |
Instrument Type: | lidar |
Description: |
Multipulse in air lidar sensor |
Catalog Details
Catalog Item ID: | 51633 |
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GUID: | gov.noaa.nmfs.inport:51633 |
Metadata Record Created By: | Kirk Waters |
Metadata Record Created: | 2018-02-26 12:15+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 |