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2006 URS Corporation Bare Earth Topographic Lidar: Shawsheen River, Massachusetts

spatialRepresentationInfo
referenceSystemInfo
referenceSystemInfo
identificationInfo
distributionInfo
dataQualityInfo
metadataMaintenance

 (MI_Metadata)
    fileIdentifier:  gov.noaa.csc.maps:ma2006_urs_shawsheen_m2576
    language:  eng; USA
    characterSet:  (MD_CharacterSetCode) utf8
    hierarchyLevel:  (MD_ScopeCode) dataset
    contact:  (CI_ResponsibleParty)
        individualName:  Mike Sutherland
        organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
        contactInfo:  (CI_Contact)
            phone:  (CI_Telephone)
                voice:  303-497-6120
                facsimile:  303-497-6513
            address:  (CI_Address)
                deliveryPoint:  NOAA/NESDIS/NGDC E/GC1 325 Broadway
                city:  Boulder
                administrativeArea:  CO
                postalCode:  80305-3328
                country:  USA
                electronicMailAddress:  mike.sutherland@noaa.gov
            hoursOfService:  7:30am-5:00pm Mountain
        role:  (CI_RoleCode) author
    dateStamp:  2013-11-26
    metadataStandardName:  ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
    metadataStandardVersion:  ISO 19115-2:2009(E)
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    spatialRepresentationInfo:  (MD_VectorSpatialRepresentation)
        geometricObjects:  (MD_GeometricObjects)
            geometricObjectType:  (MD_GeometricObjectTypeCode) point
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    referenceSystemInfo:  (MD_ReferenceSystem)
        referenceSystemIdentifier:  (RS_Identifier)
            authority:  (CI_Citation)
                title:  North American Datum 1983
                alternateTitle:  NAD83
                date:  (CI_Date)
                    date:  2007-01-19
                    dateType:  (CI_DateTypeCode) revision
                citedResponsibleParty:  (CI_ResponsibleParty)
                    organisationName:
                    contactInfo:  (CI_Contact)
                        onlineResource:  (CI_OnlineResource)
                            linkage: http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::4269
                            name:  NAD83
                            description:  Link to Geographic Markup Language (GML) description of reference system.
                            function:  (CI_OnLineFunctionCode) information
                    role:  (CI_RoleCode) resourceProvider
                citedResponsibleParty:  (CI_ResponsibleParty)
                    organisationName:  European Petroleum Survey Group
                    contactInfo:  (CI_Contact)
                        onlineResource:  (CI_OnlineResource)
                            linkage: http://www.epsg-registry.org/
                            name:  European Petroleum Survey Group Geodetic Parameter Registry
                            description:  Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured dataset of Coordinate Reference Systems and Coordinate Transformations.
                            function:  (CI_OnLineFunctionCode) search
                    role:  (CI_RoleCode) publisher
            code:  urn:ogc:def:crs:EPSG::4269
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    referenceSystemInfo:  (MD_ReferenceSystem)
        referenceSystemIdentifier:  (RS_Identifier)
            code:  Ellipsoid in Meters
            codeSpace:  Local Vertical Reference
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    identificationInfo:  (MD_DataIdentification)
        citation:  (CI_Citation)
            title:  2006 URS Corporation Bare Earth Topographic Lidar: Shawsheen River, Massachusetts
            date:  (CI_Date)
                date:  2013-10-01
                dateType:  (CI_DateTypeCode) publication
            citedResponsibleParty:  (CI_ResponsibleParty)
                organisationName:  DOC/NOAA/NOS/CSC > Coastal Services Center, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
                contactInfo:  (CI_Contact)
                    phone:  (CI_Telephone)
                        voice:  843-740-1200
                    address:  (CI_Address)
                        deliveryPoint:  2234 South Hobson Ave.
                        city:  Charleston
                        administrativeArea:  SC
                        postalCode:  29405-2413
                        electronicMailAddress:  csc.info@noaa.gov
                role:  (CI_RoleCode) originator
            citedResponsibleParty:  (CI_ResponsibleParty)
                organisationName:  URS Corporation
                role:  (CI_RoleCode) originator
            citedResponsibleParty:  (CI_ResponsibleParty)
                organisationName:  EarthData International
                role:  (CI_RoleCode) originator
            citedResponsibleParty:  (CI_ResponsibleParty)
                organisationName:  DOC/NOAA/NOS/CSC > Coastal Services Center, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
                contactInfo:  (CI_Contact)
                    phone:  (CI_Telephone)
                        voice:  843-740-1200
                    address:  (CI_Address)
                        deliveryPoint:  2234 South Hobson Ave.
                        city:  Charleston
                        administrativeArea:  SC
                        postalCode:  29405-2413
                        electronicMailAddress:  csc.info@noaa.gov
                role:  (CI_RoleCode) publisher
            presentationForm:  (CI_PresentationFormCode) imageDigital
        abstract:  URS Corporation contracted EarthData International to acquire topographic elevation data for 82 square miles in Essex and Middlesex Counties, Massachusetts during 2006. Products generated include lidar point clouds, 3D hydro breaklines, and lidar bare-earth elevation models in LAS format using lidar collected with a Leica ALS-50 Aerial Lidar Sensor. Lidar Sensor Specifications: Sensor: Leica ALS-50 Aerial Lidar Sensor (s/n ALS036) Airspeed: ~ 130 knots Laser Pulse Rate: 38,000 Hz Field of View: 35 Degrees Scan Rate: 20 Hz Average Swath Width: 1537 meters Nominal Post Spacing 3 meters
        purpose:  The purpose of these data is to provide elevation data capable of supporting generation of two foot contours and defining target drainage channel geometry.
        credit:  Please credit URS Corporation and EarthData International for all products derived from this data.
        status:  (MD_ProgressCode) completed
        pointOfContact:  (CI_ResponsibleParty)
            organisationName:  DOC/NOAA/NOS/CSC > Coastal Services Center, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
            contactInfo:  (CI_Contact)
                phone:  (CI_Telephone)
                    voice:  843-740-1200
                address:  (CI_Address)
                    deliveryPoint:  2234 South Hobson Ave.
                    city:  Charleston
                    administrativeArea:  SC
                    postalCode:  29405-2413
                    electronicMailAddress:  csc.info@noaa.gov
            role:  (CI_RoleCode) pointOfContact
        resourceMaintenance:  (MD_MaintenanceInformation)
            maintenanceAndUpdateFrequency:  (MD_MaintenanceFrequencyCode) asNeeded
        graphicOverview:  (MD_BrowseGraphic)
            fileName:  ftp://csc.noaa.gov/pub/DigitalCoast/lidar1_z/geoid12a/data/2576/supplemental/ma2006_urs_shawsheen_footprint.KMZ
            fileDescription:  This kmz file shows the extent of coverage for the 2006 URS Shawsheen River, MA lidar data set.
            fileType:  kmz
        descriptiveKeywords:  (MD_Keywords)
            keyword:  Topography/Bathymetry
            keyword:  Elevation
            keyword:  Model
            keyword:  LiDAR
            keyword:  LAS
            keyword:  LAZ
            keyword:  Remote Sensing
            type:  (MD_KeywordTypeCode) theme
            thesaurusName:  (CI_Citation)
                title:  none
                date:
        descriptiveKeywords:  (MD_Keywords)
            keyword:  US
            keyword:  Massachusetts
            keyword:  Essex County
            keyword:  Middlesex County
            keyword:  Shawsheen River
            type:  (MD_KeywordTypeCode) place
            thesaurusName:  (CI_Citation)
                title:  None
                date:
        resourceConstraints:  (MD_Constraints)
            useLimitation:  These data depict the elevations at the time of the survey and are only accurate for that time. 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. Any conclusions drawn from analysis of this information are not the responsibility of NOAA or any of its partners. These data are NOT to be used for navigational purposes.
        resourceConstraints:  (MD_LegalConstraints)
            useLimitation:  While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
        spatialRepresentationType:  (MD_SpatialRepresentationTypeCode) vector
        language:  eng; USA
        topicCategory:  (MD_TopicCategoryCode) elevation
        extent:  (EX_Extent)
            geographicElement:  (EX_GeographicBoundingBox)
                westBoundLongitude:  -71.308999
                eastBoundLongitude:  -71.122943
                southBoundLatitude:  42.443801
                northBoundLatitude:  42.725917
            temporalElement:  (EX_TemporalExtent)
                extent:
                  TimeInstant:
                    timePosition:  2006-12-16
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    distributionInfo:  (MD_Distribution)
        distributionFormat:  (MD_Format)
            name:  LAZ
            version:
        distributor:  (MD_Distributor)
            distributorContact:  (CI_ResponsibleParty)
                organisationName:  DOC/NOAA/NOS/CSC > Coastal Services Center, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
                contactInfo:  (CI_Contact)
                    phone:  (CI_Telephone)
                        voice:  843-740-1200
                    address:  (CI_Address)
                        deliveryPoint:  2234 South Hobson Ave.
                        city:  Charleston
                        administrativeArea:  SC
                        postalCode:  29405-2413
                        electronicMailAddress:  csc.info@noaa.gov
                role:  (CI_RoleCode) distributor
            distributionOrderProcess:  (MD_StandardOrderProcess)
                orderingInstructions:  The National Geophysical Data Center serves as the archive for this LIDAR data. NGDC should only be contacted for this data if it cannot be obtained from NOAA Coastal Services Center.
        distributor:  (MD_Distributor)
            distributorContact:  (CI_ResponsibleParty)
                individualName:  Mike Sutherland
                organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
                contactInfo:  (CI_Contact)
                    phone:  (CI_Telephone)
                        voice:  303-497-6120
                        facsimile:  303-497-6513
                    address:  (CI_Address)
                        deliveryPoint:  NOAA/NESDIS/NGDC E/GC1 325 Broadway
                        city:  Boulder
                        administrativeArea:  CO
                        postalCode:  80305-3328
                        country:  USA
                        electronicMailAddress:  mike.sutherland@noaa.gov
                    hoursOfService:  7:30am-5:00pm Mountain
                role:  (CI_RoleCode) distributor
            distributionOrderProcess:  (MD_StandardOrderProcess)
                orderingInstructions:  The National Geophysical Data Center serves as the archive for this LIDAR dataset. NGDC should only be contacted for the data if it cannot be obtained from NOAA Coastal Services Center.
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    dataQualityInfo:  (DQ_DataQuality)
        scope:  (DQ_Scope)
            level:  (MD_ScopeCode) dataset
        report:  (DQ_AbsoluteExternalPositionalAccuracy)
            nameOfMeasure:  Horizontal Positional Accuracy Report
            evaluationMethodDescription:  The lidar data fully comply with FEMA guidance as published in Appendix A, April 2003.
            result:
        report:  (DQ_AbsoluteExternalPositionalAccuracy)
            nameOfMeasure:  Vertical Positional Accuracy Report
            evaluationMethodDescription:  Terrasurv performed a geodetic control survey in support of LIDAR mapping. The bare-earth points have a Fundamental Vertical Accuracy of 1.2 ft. (36.3 cm) or better at the 95% confidence level in open terrain, after correction of systematic errors, computed by multiplying the RMSEz by 1.9600. This is equivalent to a vertical RMSE of 0.6 ft. (18.5 cm) or less in open terrain, equivalent to 2 foot contours that satisfy National Map Accuracy Standards. In all land cover categories combined, the bare-earth dataset has a Consolidated Vertical Accuracy of 1.6 ft. (49.0 cm) or better at the 95% confidence level, computed by the 95th percentile method of endorsement by the National Digital Elevation Program. The vertical accuracy of the lidar data fully complies with FEMA guidance as published in Appendix A, April 2003 and National Standard for Spatial Accuracy (NSSDA).
            result:
        report:  (DQ_AbsoluteExternalPositionalAccuracy)
            nameOfMeasure:  Vertical Positional Accuracy
            measureDescription:  Tested Vertical Root Mean Square Error (RMSEz) in open area. Units in meters.
            result:  (DQ_QuantitativeResult)
                valueUnit:
                  BaseUnit:
                    identifier:  meters
                    unitsSystem:
                value:
                  Record:  0.185
        report:  (DQ_CompletenessCommission)
            evaluationMethodDescription:  Two checks for completeness were performed: 1. EarthData's proprietary software, Checkedb, for verification agianst ground survey points. 2. Terrascan, for verification of automated and manual editing and final QC of products.
            result:
        report:  (DQ_ConceptualConsistency)
            measureDescription:  Compliance with the accuracy standard was ensured by the placement of GPS ground control prior to the acquisition of lidar data. The following checks were performed. 1. The ground control and airborne GPS data stream were validated through a fully analytical boresight adjustment. 2. The DTM (Digital Terrain Model) data were checked against the project control. 3. Lidar elevation data was validated through an inspection of edge matching and visual inspection for quality (artifact removal).
            result:
        lineage:  (LI_Lineage)
            processStep:  (LE_ProcessStep)
                description:  Terrasurv was tasked to perform a geodetic control survey in support of LIDAR mapping of the Shawsheen river area in Essex and Middlesex Counties, Massachusetts. The Global Positioning System (GPS) was used in a static differential mode to measure the interstation vectors of the network. The National Spatial Reference System (NSRS) was used to provide control for the network. Continuously Operating Reference Station WMTS was used, along with two ground stations of the NSRS. Two Trimble dual frequency receivers were used on day 361 of 2006. A base receiver was set up near on C 35, at the Lawrence Municipal Airport. This point was also used by the flight crew during the aerial data acquisition phase. The two northerly LIDAR points (SR-1 and SR-5) were surveyed using this station as a base. The other three LIDAR stations, and benchmark V 34, were surveyed using the CORS as a base. The horizontal datum was the North American Datum of 1983, 1996 adjustment (NAD 1983 1996), and the vertical datum was the North American Vertical Datum of 1988 (NAVD 1988) Geoid03.
                dateTime:
                  DateTime:  2006-12-27T00:00:00
            processStep:  (LE_ProcessStep)
                description:  URS contracted EarthData International, Inc. (EarthData) to collect and deliver high quality topographic elevation point data derived from multiple return, light detection and ranging (Lidar) measurements for an area of interest totaling approximately 82 square miles in Essex and Middlesex Counties, Massachusetts. Data was collected at a nominal three meter (3) meter post spacing between points at an altitude of 2438 meters (8,000 feet) above mean terrain. This data was used to produce a bare-earth surface model and hydro-enforced breaklines for the project. The aerial acquisition was conducted on 16 December, 2006 using and aircraft (tail number N2636P). Lidar data was captured using an ALS-50 Lidar system, s/n ALS036, including an inertial measuring unit (IMU) and a dual frequency GPS receiver.
                dateTime:
                  DateTime:  2006-12-16T00:00:00
            processStep:  (LE_ProcessStep)
                description:  EarthData has developed a unique method for processing lidar data to identify and remove elevation points falling on vegetation, buildings, and other aboveground structures. The algorithms for filtering data were utilized within EarthData's proprietary software and commercial software written by TerraSolid. This software suite of tools provides efficient processing for small to large-scale, projects and has been incorporated into ISO 9001 compliant production work flows. The following is a step-by-step breakdown of the process. 1. Using the lidar data set provided by EarthData, the technician performs calibrations on the data set. 2. Using the lidar data set provided by EarthData, the technician performed a visual inspection of the data to verify that the flight lines overlap correctly. The technician also verified that there were no voids, and that the data covered the project limits. The technician then selected a series of areas from the data set and inspected them where adjacent flight lines overlapped. These overlapping areas were merged and a process which utilizes 3-D Analyst and EarthData's proprietary software was run to detect and color code the differences in elevation values and profiles. The technician reviewed these plots and located the areas that contained systematic errors or distortions that were introduced by the lidar sensor. 3. Systematic distortions highlighted in step 2 were removed and the data was re-inspected. Corrections and adjustments can involve the application of angular deflection or compensation for curvature of the ground surface that can be introduced by crossing from one type of land cover to another. 4. The lidar data for each flight line was trimmed in batch for the removal of the overlap areas between flight lines. The data was checked against a control network to ensure that vertical requirements were maintained. Conversion to the client-specified datum and projections were then completed. The lidar flight line data sets were then segmented into adjoining tiles for batch processing and data management. 5. The initial batch-processing run removed 95% of points falling on vegetation. The algorithm also removed the points that fell on the edge of hard features such as structures, elevated roadways and bridges. 6. The operator interactively processed the data using lidar editing tools. During this final phase the operator generated a TIN based on a desired thematic layers to evaluate the automated classification performed in step 5. This allowed the operator to quickly re-classify points from one layer to another and recreate the TIN surface to see the effects of edits. Geo-referenced images were toggled on or off to aid the operator in identifying problem areas. The data was also examined with an automated profiling tool to aid the operator in the reclassification. 7. The point cloud data were delivered in LAS format.
                dateTime:
                  DateTime:  2007-02-28T00:00:00
            processStep:  (LE_ProcessStep)
                description:  3-D breaklines were created for the creation of a completely new hydrology dataset specifically tailored to meets the needs of the users of terrain data. 1) Breaklines were generated for all streams draining greater than approximately 1 square mile. 2) Two-dimensional lines defining the centerline and banks of those streams were manually digitized into Microstation format from the available 2002 source digital aerial imagery using lidar hillshades as an ancillary reference. 3) Breaklines were collected, unbroken through closed water bodies and culverts, as well as under roads, railroads, and bridges, in order to maintain proper stream network connectivity. 4) The entire breakline dataset was checked to ensure integrity of the linework with respect to topologic structure, connectivity, and positive downhill stream flow. 5) Single line streams were collected with the following criteria: Any area of drainage that did not meet the criteria to be collected as a double banked stream or closed water body. 6) Double-banked streams were collected with the Any area of drainage that was at least 40 feet wide for a distance of greater than 540 feet, and excluding closed water bodies. Double banked streams were delivered as linear features. 7) Artificial path lines were collected as the center line for all double banked streams and closed water bodies. Artificial paths were also created for closed water bodies where no flow path was delineated coming into or leaving the water body, and/or where the closed water body existed as the origin source of a flow path. 8) Artificial paths that are drawn in the two instances above go through the center of the water body and stop halfway through it. Artificial paths were only drawn for water bodies that fell on a streamline. 9) Any islands found within water bodies were collected in instances where trees were visible on them (indicating that these are permanent features). These islands were delivered as separate polyline features if present. 10) Any and all closed water bodies were collected, regardless of size, excluding such features as swimming pools, for the entire project area. 11) Water bodies were delivered as polygon features. 12) Single line streams, double banked streams, artificial paths and closed water bodies have unique attribution such that one feature type can be easily distinguished from another. 13) Linework was delivered in ESRI shape file format. 14) The 3D Hydro Breaklines were developed for the sole purpose of supporting flood mapping and should not be used to generate contours
                dateTime:
                  DateTime:  2007-02-28T00:00:00
            processStep:  (LE_ProcessStep)
                description:  The NOAA Coastal Services Center (CSC) received topographic files las V1.1 format. The files contained lidar elevation measurements, Class 2 Points, return information, scan angle, intensity values and GPS Week Time. The data were received in Massachusetts State Plane Mainland Zone 2001, NAD83 coordinates and were vertically referenced to NAVD88 using the Geoid03 model. The vertical units of the data were meters. CSC performed the following processing for data storage and Digital Coast provisioning purposes: 1. The GPS Week Time was converted to Adjusted Standard GPS Time. 2. The las files were changed from V 1.1 to V 1.2. 3. The las files were converted from orthometric (NAVD88) heights to ellipsoidal heights using Geoid03. 4. The las files were converted from a Projected Coordinate System (MA SP Mainland) to a Geographic Coordinate System (NAD83). 5. The las files' horizontal units were converted from meters to decimal degrees. 6. The data were converted to LAZ format.
                dateTime:
                  DateTime:  2013-10-01T00:00:00
                processor:  (CI_ResponsibleParty)
                    organisationName:  DOC/NOAA/NOS/CSC > Coastal Services Center, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
                    contactInfo:  (CI_Contact)
                        phone:  (CI_Telephone)
                            voice:  843-740-1200
                        address:  (CI_Address)
                            deliveryPoint:  2234 South Hobson Ave.
                            city:  Charleston
                            administrativeArea:  SC
                            postalCode:  29405-2413
                            electronicMailAddress:  csc.info@noaa.gov
                    role:  (CI_RoleCode) processor
            processStep:  (LE_ProcessStep)
                description:  The NOAA National Geophysical Data Center (NGDC) received lidar data files via ftp transfer from the NOAA Coastal Services Center. The data are currently being served via NOAA CSC Digital Coast at http://www.csc.noaa.gov/digitalcoast/. The data can be used to re-populate the system. The data are archived in LAS or LAZ format. The LAS format is an industry standard for LiDAR data developed by the American Society of Photogrammetry and Remote Sensing (ASPRS); LAZ is a loseless compressed version of LAS developed by Martin Isenburg (http://www.laszip.org/). The data are exclusively in geographic coordinates (either NAD83 or ITRF94). The data are referenced vertically to the ellipsoid (either GRS80 or ITRF94), allowing for the ability to apply the most up to date geoid model when transforming to orthometric heights.
                dateTime:
                  DateTime:  2013-11-26T00:00:00
                processor:  (CI_ResponsibleParty)
                    individualName:  Mike Sutherland
                    organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
                    contactInfo:  (CI_Contact)
                        phone:  (CI_Telephone)
                            voice:  303-497-6120
                            facsimile:  303-497-6513
                        address:  (CI_Address)
                            deliveryPoint:  NOAA/NESDIS/NGDC E/GC1 325 Broadway
                            city:  Boulder
                            administrativeArea:  CO
                            postalCode:  80305-3328
                            country:  USA
                            electronicMailAddress:  mike.sutherland@noaa.gov
                        hoursOfService:  7:30am-5:00pm Mountain
                    role:  (CI_RoleCode) processor
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    metadataMaintenance:  (MD_MaintenanceInformation)
        maintenanceAndUpdateFrequency:  (MD_MaintenanceFrequencyCode) annually
        dateOfNextUpdate:  2014-11-26
        maintenanceNote:  This metadata was automatically generated from the FGDC Content Standards for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2013-01-04 version of the FGDC RSE to ISO 19115-2 for LiDAR transform.
        maintenanceNote:  Translated from FGDC 2013-11-26T15:38:03.188-05:00