2011 Worcester County - VA FEMA LiDAR
OCM Partners
Data Set
(DS)
| ID: 51657
| Published / External
Created: 2018-02-27
|
Last Modified: 2023-10-17
Project (PRJ) | ID: 49401
ID: 51657
Data Set (DS)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | 2011 Worcester County - VA FEMA LiDAR |
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Short Name | 2011 Coastal Worcester |
* Status | Completed |
Creation Date | |
Revision Date | |
• Publication Date | 2018 |
* » Abstract |
Dewberry collected LiDAR for ~3,341 square miles in various Virginia Counties, a part of Worcester County, and Hooper's Island. The acquisition was performed by Terrapoint. This metadata covers the LiDAR produced for Worcester County. The nominal pulse spacing for this project is 0.5 meters. This project was collected with a sensor which collects intensity values for each discrete pulse extracted from the waveform. GPS Week Time, Intensity, Flightline and echo number attributes were provided for each LiDAR point. Dewberry used proprietary procedures to classify the LAS according to contract specifications: 1-Unclassified, 2-Ground, 7-Noise, 9-Water, 10-Ignored Ground due to breakline proximity, and 11-Withheld. Dewberry produced 3D breaklines and combined these with the final LiDAR data to produce seamless hydro flattened DEMs for the 263 tiles (6000 ft x 4000 ft) that cover the project area. |
* Purpose |
The purpose of this LiDAR data was to produce high accuracy 3D elevation products, including tiled LiDAR in LAS 1.2 format, 3D breaklines, and a 2 ft cell size hydro flattened Digital Elevation Models (DEM). |
Notes |
Obtained by NOAA from the Maryland iMAP system (imap.maryland.gov). |
Other Citation Details | |
• Supplemental Information | |
DOI (Digital Object Identifier) | |
DOI Registration Authority | |
DOI Issue Date |
Keywords
Theme Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Science Keywords | EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION |
ISO 19115 Topic Category | elevation |
None | bare earth |
None | bare ground |
None | high-resolution |
None | Light Detection and Ranging |
Temporal Keywords
Thesaurus | Keyword |
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* Spatial Keywords
Thesaurus | Keyword |
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Geographic Names Information System | Maryland |
Stratum Keywords
Thesaurus | Keyword |
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Instrument Keywords
Thesaurus | Keyword |
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Platform Keywords
Thesaurus | Keyword |
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Physical Location
• » Organization | Office for Coastal Management |
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• » City | Charleston |
• » State/Province | SC |
• Country | |
• » Location Description |
Data Set Information
* Data Set Scope Code | Data Set |
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• Data Set Type | GIS Files |
• Maintenance Frequency | As Needed |
Maintenance Note | |
» Data Presentation Form | Map (digital) |
• Entity Attribute Overview |
Lidar point cloud x,y,z and intensity data with classification scheme: 1-Unclassified, 2-Ground, 7-Noise, 9-Water, 10-Ignored Ground due to breakline proximity, and 11-Withheld. |
Entity Attribute Detail Citation | |
Entity Attribute Detail URL | |
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 | Dewberry, FEMA |
Support Roles
* » Support Role | Data Steward |
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* » Date Effective From | 2018-02-26 |
Date Effective To | |
Person | Waters, Kirk |
Email Address | kirk.waters@noaa.gov |
Phone | |
Fax | |
Mobile | |
URL | |
Business Hours | |
Contact Instructions |
* » Support Role | Distributor |
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* » Date Effective From | 2018-02-26 |
Date Effective To | |
Organization | Office for Coastal Management (OCM) |
Address |
2234 South Hobson Avenue Charleston, SC 29405-2413 |
Email Address | |
Phone | |
Fax | |
Mobile | |
URL | https://www.coast.noaa.gov/ |
Business Hours | |
Contact Instructions |
* » Support Role | Metadata Contact |
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* » Date Effective From | 2018-02-26 |
Date Effective To | |
Person | Waters, Kirk |
Email Address | kirk.waters@noaa.gov |
Phone | |
Fax | |
Mobile | |
URL | |
Business Hours | |
Contact Instructions |
* » Support Role | Point of Contact |
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* » Date Effective From | 2018-02-26 |
Date Effective To | |
Person | Waters, Kirk |
Email Address | kirk.waters@noaa.gov |
Phone | |
Fax | |
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URL | |
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Contact Instructions |
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* » Contact | |
* Contact Instructions |
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* Contact Instructions |
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* » Date Effective From | |
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* » Contact | |
* Contact Instructions |
Extents
Currentness Reference | Ground Condition |
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Extent Group 1
Extent Description |
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Extent Group 1 / Geographic Area 1
* » W° Bound | -75.306562 |
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* » E° Bound | -75.047219 |
* » N° Bound | 38.4528449 |
* » S° Bound | 38.024069 |
* » Description |
Coastal Worcester Maryland |
Extent Group 1 / Vertical Extent
EPSG Code | |
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Vertical Minimum | |
Vertical Maximum |
Extent Group 1 / Time Frame 1
* » Time Frame Type | Range |
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* » Start | 2011-03-05 |
End | 2011-07-29 |
Alternate Start As Of Info | |
Alternate End As Of Info | |
Description |
Acquisition dates for the lidar collection |
Spatial Information
Spatial Resolution
Angular Distance | |
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Angular Distance Units | |
Horizontal Distance | 0.5 |
Horizontal Distance Units | Meter |
Vertical Distance | |
Vertical Distance Units | |
Equivalent Scale Denominator | |
Level of Detail Description |
Spatial Representation
Grid Representation Used? | |
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Vector Representation Used? | Yes |
Text / Table Representation Used? | |
TIN Representation Used? | |
Stereo Model Representation Used? | |
Video Representation Used? |
Grid Representation
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Vector Representation
Topology Level | |
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Complex Object Present? | |
Complex Object Count | |
Composite Object Present? | |
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Curve Object Present? | |
Curve Object Count | |
Point Object Present? | Yes |
Point Object Count | 1478659827 |
Solid Object Present? | |
Solid Object Count | |
Surface Object Present? | |
Surface Object Count |
Vector Representation
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Surface Object Count |
Reference Systems
Reference System
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Access Information
* » Security Class | Unclassified |
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* Security Classification System | |
Security Handling Description | |
• Data Access Policy | |
» Data Access Procedure |
Access via online tool |
• » Data Access Constraints |
none |
• Data Use Constraints |
This data was produced for the USGS and FEMA according to specific project requirements. This information is provided "as is". Further documentation of this data can be obtained by contacting: Patrick Emmett, MS 666, 1400 Independence Road, Rolla, MO 65401. Telephone (573) 308-3587. |
Metadata Access Constraints | |
Metadata Use Constraints |
Distribution Information
Start Date | 2018-03-14 |
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End Date | Present |
» Download URL | https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8486 |
Distributor | Office for Coastal Management (OCM) (2018-02-26 - Present) |
File Name | |
Description |
Customizable download of point cloud data and derived products. |
File Date/Time | |
File Type (Deprecated) | LAZ |
Distribution Format | LAS/LAZ - LASer |
File Size | |
Application Version | |
Compression | Zip |
Review Status |
Start Date | |
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End Date | |
» Download URL | |
Distributor | |
File Name | |
Description | |
File Date/Time | |
File Type | |
FGDC Content Type | |
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Application Version | |
Compression | |
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Start Date | |
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Compression | |
Review Status |
URLs
URL | https://coast.noaa.gov/digitalcoast |
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Name | Digital Coast |
URL Type | Online Resource |
File Resource Format | |
Description |
URL | http://imap.maryland.gov/Pages/lidar-download-files.aspx |
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Name | Maryland iMAP |
URL Type | Online Resource |
File Resource Format | |
Description |
Location of the originating point clouds. |
URL | |
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Name | |
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Description |
URL | |
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Activity Log
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Responsible Party | |
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Issues
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Issue |
Technical Environment
Description |
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Data Quality
Representativeness | |
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Accuracy | |
Analytical Accuracy | |
Horizontal Positional Accuracy |
Not tested. Expected to be less than 1 meter at 95% confidence level. |
Vertical Positional Accuracy |
The vertical accuracy of the LiDAR was tested by Dewberry with 60 independently collected checkpoints. The survey checkpoints are evenly distributed throughout the project area and cover the three major land cover classifications. All 60 checkpoints were used to compute the Fundamental Vertical Accuracy (FVA). Project specifications required a FVA of 0.60 ft (18 cm) based on a RMSEz 0.31 ft (9.25 cm) x 1.9600. All checkpoints were also used to compute the Consolidated Vertical Accuracy (CVA). Project specifications required a CVA of 1.19ft (36.3 cm) based on the 95th percentile. The dataset for the Worcester County project satisfies the criteria for FVA: Lidar dataset tested 0.43 ft vertical accuracy at 95% confidence level, based on RMSEz (0.22 ft) x 1.9600. Based on the vertical accuracy testing conducted by Dewberry, using NDEP and ASPRS methodology, consolidated vertical accuracy at the 95% confidence level is computed using the 95th percentile method. The dataset for the Worcester County project satisfies the criteria: Lidar dataset tested 0.90 ft vertical accuracy at 95% confidence level in all land cover categories combined. |
Quantitation Limits | |
Bias | |
Comparability | |
Completeness Measure | |
Precision | |
Analytical Precision | |
Field Precision | |
Sensitivity | |
Detection Limit | |
Completeness Report | |
Conceptual Consistency | |
» Quality Control Procedures Employed |
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 |
» If Distributor (Data Hosting Service) is Needed, Please Indicate | |
» Approximate Delay Between Data Collection and Dissemination | |
» If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed | |
» Actual or Planned Long-Term Data Archive Location | NCEI-CO |
» Approximate Delay Between Data Collection and Archiving | |
» How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive? |
Lineage
» Lineage Statement |
Original acquisition and processing of lidar data was completed by Terrapoint and Dewberry. It was delivered to FEMA, USGS, and Maryland. NOAA OCM obtained the data from Maryland iMAP and modified for ingest into the Digital Coast system. |
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Sources
Citation Title | Lidar data from Maryland iMAP |
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Contact Role Type | |
Contact Type | |
Contact Name | |
Publish Date | |
Extent Type | Range |
Extent Start Date/Time | 2011-02-06 |
Extent End Date/Time | 2011-02-16 |
Scale Denominator | |
Citation URL | http://imap.maryland.gov/Pages/default.aspx |
Citation URL Name | |
Citation URL Description | |
Source Contribution |
Point cloud data repository for Maryland |
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Process Steps
Process Step Number | 1 |
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» Description |
Establishment of survey points to support the LiDAR data collection. Two existing published NGS stations (AI7609, HU2327) were observed in a GPS control network and used to establish four new points for the primary control for this site. 1110312 was observed and used to control all flight missions and static ground surveys. The following are the final coordinates of the control points used for this project: SurveyBlock, Station, Latitude(D M S Hem), Longitude(D M S Hem), H-Ell(m), H-MSL(m) Worcester, 1110312, N38 18 22.12367, W75 07 40.46389, -33.7921, 2.2581 |
Process Date/Time | 2011-03-01 00:00:00 |
Process Contact | |
Phone (Voice) | |
Email Address | |
Source |
Process Step Number | 2 |
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» Description |
Airborne GPS Kinematic processing Airborne GPS kinematic data was processed on-site using GrafNav kinematic On-The-Fly (OTF) software. Flights were flown with a minimum of 6 satellites in view (13o above the horizon) and with a PDOP of better than 4. Distances from base station to aircraft were kept to a maximum of 40 km, to ensure a strong OTF (On-The-Fly) solution. For all flights, the GPS data can be classified as excellent, with GPS residuals of 3cm average but no larger than 10 cm being recorded. The Geoid09 geoid model, published by the NGS, was used to transform all ellipsoidal heights to orthometric. |
Process Date/Time | 2011-03-01 00:00:00 |
Process Contact | |
Phone (Voice) | |
Email Address | |
Source |
Process Step Number | 3 |
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» Description |
Mission to mission adjustments of Lidar data All missions are validated and adjusted against the adjoining missions for relative vertical biases and collected GPS static and kinematic ground truthing points for absolute vertical accuracy purposes |
Process Date/Time | 2011-04-01 00:00:00 |
Process Contact | |
Phone (Voice) | |
Email Address | |
Source |
Process Step Number | 4 |
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» Description |
Dewberry utilizes a variety of software suites for inventory management, classification, and data processing. All LiDAR related processes begin by importing the data into the GeoCue task management software. GeoCue allows the data to retain its delivered tiling scheme (6000 ft by 4000 ft). The tiled data is then opened in Terrascan where Dewberry uses proprietary ground classification routines to remove any non-ground points and generate an accurate ground surface. The ground routine consists of three main parameters (building size, iteration angle, and iteration distance); by adjusting these parameters and running several iterations of this routine an initial ground surface is developed. The building size parameter sets a roaming window size. Each tile is loaded with neighboring points from adjacent tiles and the routine classifies the data section by section based on this roaming window size. The second most important parameter is the maximum terrain angle, which sets the highest allowed terrain angle within the model. Once the ground routine has been completed a manual quality control routine is done using hillshades, cross-sections, and profiles within the Terrasolid software suite. After this QC step, a peer review and supervisor manual inspection is completed on a percentage of the classified tiles based on the project size and variability of the terrain. After the ground classification corrections were completed, the dataset was processed through a water classification routine that utilizes breaklines compiled by Dewberry to automatically classify hydrographic features. The water classification routine selects ground points within the breakline polygons and automatically classifies them as class 9, water. During this water classification routine, points which are in close proximity (1 m) to the hydrographic features are moved to class 10, an ignored ground. In addition to classes 1, 2, 8, 9, and 10, the project allows for a Class 7, noise points. This class was only used if needed when points could manually be identified as low/high points. Dewberry also used Class 11 - Withheld points. The fully classified dataset is then processed through Dewberry's comprehensive quality control program. The data was classified as follows: Class 1 = Unclassified. This class includes vegetation, buildings, noise etc. Class 2 = Ground Class 7= Noise Class 8= Model Key Points Class 9 = Water Class 10= Ignored Ground Class 11= Withheld The LAS header information was verified to contain the following: Class (Integer) GPS Week Time (0.0001 seconds) Easting (0.01 ft) Northing (0.01 ft) Elevation (0.01 ft) Echo Number (Integer 1 to 4) Echo (Integer 1 to 4) Intensity (8 bit integer) Flight Line (Integer) Scan Angle (Integer degree) |
Process Date/Time | 2011-11-01 00:00:00 |
Process Contact | |
Phone (Voice) | |
Email Address | |
Source |
Process Step Number | 6 |
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» Description |
Deliverable Product Generation Raw Lidar point were reprojected from UTM zone 18 to the delivery projection State Plane Maryland, US Survey Feet. *Raw Calibrated LIDAR Point Cloud Raw LiDAR point cloud, was provided in the following formats/parameters: - LAS V1.2, point record format 1, Adjusted GPS time, georeferencing information populated in header - The following fields are included in the LAS file: 1. Adjusted GPS time reported to the nearest microsecond 2. Flight line ID 3. Easting (reported to the nearest 0.01m) 4. Northing (reported to the nearest 0.01m) 5. Elevation (reported to the nearest 0.01m) 6. intensity 7. Echo number 8. Classification 9. Scan angle 10. Edge of scan 11. Scan direction - Full swaths, all collected points delivered (except discarded flightline) - The Withheld bit flags the last 3 degrees of the swath - 1 file per swath, 1 swath per file (except when swath had to be divided in section for size or calibration). |
Process Date/Time | |
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Phone (Voice) | |
Email Address | |
Source |
Process Step Number | 7 |
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» Description |
NOAA OCM downloaded the data from Maryland iMAP as zip files by Block. |
Process Date/Time | 2017-10-16 00:00:00 |
Process Contact | Office for Coastal Management (OCM) |
Phone (Voice) | |
Email Address | |
Source | Lidar data from Maryland iMAP |
Process Step Number | 8 |
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» Description |
Lidar data were changed from NAVD88 (Geoid09) vertical coordinates to ellipsoid heights using the GEOID09 grids. Horizontal coordinates were changed to geographic NAD83(NSRS2007) Data were then ingested into the Digital Coast Data Access Viewer system for distribution. |
Process Date/Time | 2018-02-26 00:00:00 |
Process Contact | Office for Coastal Management (OCM) |
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Acquisition Information
Instruments
Identifier | Leica ALS60 |
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Docucomp UUID | |
Instrument / Gear | Instrument |
Instrument Type | lidar |
Description |
Multipulse in air lidar sensor |
Identifier | |
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Platforms
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FAQs
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Child Items
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Related Items
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Catalog Details
Catalog Item ID | 51657 |
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Metadata Record Created By | Kirk Waters |
Metadata Record Created | 2018-02-27 15:43+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 Workflow State | Published / External |
Metadata Last Review Date | 2022-03-16 |
Metadata Review Frequency | 1 Year |
Metadata Next Review Date | 2023-03-16 |
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