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2006 Texas Water Development Board (TWDB) Lidar: Northern Cameron and Willacy Counties
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                city:  Charleston
                administrativeArea:  SC
                postalCode:  29405-2413
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      DateTime:  2022-08-09T17:11:37
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    identificationInfo:  (MD_DataIdentification)
        citation:  (CI_Citation)
            title:  2006 Texas Water Development Board (TWDB) Lidar: Northern Cameron and Willacy Counties
            alternateTitle:  tx2005_cameron_willacy_m98_metadata
            date:  (CI_Date)
                date:  2007-08
                dateType:  (CI_DateTypeCode) publication
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                    title:  NOAA/NMFS/EDM
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                  Anchor:  InPort Catalog ID 50032
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                        linkage: https://www.fisheries.noaa.gov/inport/item/50032
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                        description:  View the complete metadata record on InPort for more information about this dataset.
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        abstract:  Using a LH Systems ALS50 Light Detection And Ranging (LiDAR) system, standard density (1.4 meter ground sample distance) data were collected over areas in Northern Cameron and Willacy Counties, TX (approximately 1021 square miles). Multiple returns were recorded for each laser pulse along with an intensity value for each return. The data are bare earth classified. The data acquisition occurred in 36 missions between December 14, 2005 and February 23, 2006. The data was collected by Sanborn Mapping Company, Inc. for the Texas Water Development Board (TWDB) and the Federal Emergency Management Agency (FEMA). Data arrived at NOAA OCM (formerly CSC) with a number of tiles without classified ground points. This caused issues in the automated delivery of data through the Digital Coast. As a result, users would request ground points (because the data parameters included ground) in areas without this classification. This caused data errors. In order to improve the data use and eradicate errors in automation, a software known as lasground was used to classify unclassified points to ground. The new files were replaced on the internal servers and on the ftp server. Original contact information: Contact Name: Ryan Mitchell Contact Org: Texas Natural Resources Information System (TNRIS) Phone: 512-463-8337 Email: lidar@tnris.state.tx.us This data set is an LAZ (compressed LAS) format file containing LIDAR point cloud data.
        purpose:  This LIDAR operation was designed to provide a high density set of masspoints within the defined areas. The data sets are suitable for the development of contours for use in hydraulic/hydrologic model development, and for assessing environmental impacts. Typical uses for the data set include: FEMA Flood Plain Map Modernization, DFIRM map updates, watersheds and other hydro studies per FEMA specifications, county mapping projects, and flood mitigation assessment.
        credit:  Data collected by Sanborn Mapping Company, Inc. for the Texas Water Development Board (TWDB) and the Federal Emergency Management Agency (FEMA). Acknowledgement of TNRIS (Texas Natural Resources Information System) would be appreciated in products derived and used from this data. Sanborn Mapping Company asks to be credited in derived products. The custom download may be cited as National Oceanic and Atmospheric Administration (NOAA) Digital Coast Data Access Viewer. Charleston, SC: NOAA Office for Coastal Management. Accessed Aug 01, 2023 at https://coast.noaa.gov/dataviewer.
        status:  (MD_ProgressCode) completed
        pointOfContact:  (CI_ResponsibleParty)
            organisationName:  NOAA Office for Coastal Management
            contactInfo:  (CI_Contact)
                phone:  (CI_Telephone)
                    voice:  (843) 740-1202
                address:  (CI_Address)
                    deliveryPoint:  2234 South Hobson Ave
                    city:  Charleston
                    administrativeArea:  SC
                    postalCode:  29405-2413
                    country: (missing)
                    electronicMailAddress:  coastal.info@noaa.gov
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                    linkage: https://coast.noaa.gov
                    protocol:  WWW:LINK-1.0-http--link
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                    description:  NOAA Office for Coastal Management Home Page
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                    deliveryPoint:  2234 South Hobson Ave
                    city:  Charleston
                    administrativeArea:  SC
                    postalCode:  29405-2413
                    country: (missing)
                    electronicMailAddress:  coastal.info@noaa.gov
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                    linkage: https://coast.noaa.gov
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                    description:  NOAA Office for Coastal Management Home Page
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            role:  (CI_RoleCode) custodian
        resourceMaintenance:  (MD_MaintenanceInformation)
            maintenanceAndUpdateFrequency:  (MD_MaintenanceFrequencyCode) notPlanned
        descriptiveKeywords:  (MD_Keywords)
            keyword:  Drainage Area
            keyword:  Hydraulic
            keyword:  Hydrographic
            keyword:  Hydrology
            keyword:  TNRIS (Texas Natural Resources Information System)
            type:  (MD_KeywordTypeCode) theme
        descriptiveKeywords:  (MD_Keywords)
            keyword:  Lidar - partner (no harvest)
            type:  (MD_KeywordTypeCode) project
            thesaurusName:  (CI_Citation)
                title:  InPort
                date: (inapplicable)
        resourceConstraints:  (MD_LegalConstraints)
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            otherConstraints:  Cite As: OCM Partners, [Date of Access]: 2006 Texas Water Development Board (TWDB) Lidar: Northern Cameron and Willacy Counties [Data Date Range], https://www.fisheries.noaa.gov/inport/item/50032.
        resourceConstraints:  (MD_Constraints)
            useLimitation:  NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
        resourceConstraints:  (MD_LegalConstraints)
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            useConstraints:  (MD_RestrictionCode) otherRestrictions
            otherConstraints:  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. | Distribution Liability: Any conclusions drawn from the analysis of this information are not the responsibility of the Texas Water Development Board, the Texas Natural Resources Information System (TNRIS), the Sanborn Mapping Company, the Office for Coastal Management, or its partners.
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            classification:  (MD_ClassificationCode) unclassified
            classificationSystem: (missing)
            handlingDescription: (missing)
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                title:  NOAA Data Management Plan (DMP)
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                    code:  50032
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                            linkage: https://www.fisheries.noaa.gov/inportserve/waf/noaa/nos/ocmp/dmp/pdf/50032.pdf
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                            name:  NOAA Data Management Plan (DMP)
                            description:  NOAA Data Management Plan for this record on InPort.
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        spatialRepresentationType:  (MD_SpatialRepresentationTypeCode) vector
        language:  eng; US
        topicCategory:  (MD_TopicCategoryCode) elevation
        environmentDescription:  Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350
        extent:  (EX_Extent)
            geographicElement:  (EX_GeographicBoundingBox)
                westBoundLongitude:  -98.018265
                eastBoundLongitude:  -97.145144
                southBoundLatitude:  26.006739
                northBoundLatitude:  26.616343
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                extent:
                  TimePeriod:
                    description:   | Currentness: Publication Date
                    beginPosition:  2005-12-14
                    endPosition:  2006-02-23
        supplementalInformation:  The Cameron and Willacy Counties data set was received from the Texas Water Development Board (TWDB). It was reviewed by the NOAA Office for Coastal Management at the macro level, which included checking for format and point characteristics for approximately 5% of the tiles. In addition, the entire data set was reviewed to establish that bare earth processing and proper classification of the points had been performed. It did not include accuracy or data processing (e.g. bare earth quality, flightline mismatch, feature removal) assessments. Based on the limited review, the data set on average appeared to be of poor quality. This determination is based on the issues listed under the reviews below. Again, no accuracy assessment was performed. The results may be viewed as a formatted document. This document is entitled "Lidar Fact Sheet: Cameron and Willacy Counties" and may be viewed at: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/98/supplemental/tx2006_twbd_cameron_willacy_m98_lidarfactsheet.pdf A footprint for the project acquisition can be viewed here: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/98/supplemental/tx2006_twbd_cameron_willacy_m98.kmz Tile Review The Cameron and Willacy Counties lidar data do not cover the entire area of Cameron and Willacy, the southern portion of Cameron County is not covered. The reviewed tiles had some formatting issues; the primary issues noted in this review are: 1. Lack of ground classification (#2) for much of the county. (See Figure 1 of the pdf) 2. Only single returns available 3. Water points remain, not classified Bare Earth Point Density Review The general lack of bare-earth classification can be seen in Figure 1 of the pdf. Much of Willacy County and the central portion of Cameron County have not been classified so the bare earth covers only a portion of the area. This is an important point-if requesting bare earth points-only a portion of the area will be returned. The barrier island does have ground classifications, but no water removal. A footprint of this data set may be viewed in Google Earth at: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/98/supplemental/2006_TWDB_Lidar_Cameron_and_Willacy_Counties.kmz
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            distributorContact:  (CI_ResponsibleParty)
                organisationName:  NOAA Office for Coastal Management
                contactInfo:  (CI_Contact)
                    phone:  (CI_Telephone)
                        voice:  (843) 740-1202
                    address:  (CI_Address)
                        deliveryPoint:  2234 South Hobson Ave
                        city:  Charleston
                        administrativeArea:  SC
                        postalCode:  29405-2413
                        country: (missing)
                        electronicMailAddress:  coastal.info@noaa.gov
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                        linkage: https://coast.noaa.gov
                        protocol:  WWW:LINK-1.0-http--link
                        name:  NOAA Office for Coastal Management Website
                        description:  NOAA Office for Coastal Management Home Page
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                linkage: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=98
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                name:  Bulk Download
                description:  Simple download of data files.
                function:  (CI_OnLineFunctionCode) download
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    dataQualityInfo:  (DQ_DataQuality)
        scope:  (DQ_Scope)
            level:  (MD_ScopeCode) dataset
        report:  (DQ_AbsoluteExternalPositionalAccuracy)
            nameOfMeasure:  Horizontal Positional Accuracy
            evaluationMethodDescription:  FEMA LiDAR Specifications; 1 m at 95% confidence level
            result: (missing)
        report:  (DQ_AbsoluteExternalPositionalAccuracy)
            nameOfMeasure:  Vertical Positional Accuracy
            evaluationMethodDescription:  FEMA LiDAR Specifications; +/- 18.5 cm RMSE in open terrain
            result: (missing)
        report:  (DQ_CompletenessCommission)
            nameOfMeasure:  Completeness Report
            evaluationMethodDescription:  None
            result: (missing)
        report:  (DQ_ConceptualConsistency)
            nameOfMeasure:  Conceptual Consistency
            evaluationMethodDescription:  None
            result: (missing)
        lineage:  (LI_Lineage)
            statement: (missing)
            processStep:  (LI_ProcessStep)
                description:  Data Collection: Using a LH Systems ALS50 Light Detection And Ranging (LiDAR) system, standard density (1.4 meter ground sample distance) data were collected over areas in Northern Cameron and Willacy Counties, TX (approximately 1021 square miles). Multiple returns were recorded for each laser pulse along with an intensity value for each return. The data acquisition occurred in missions between December 14, 2005 and February 23, 2006. During the LIDAR campaign, the Sanborn field crew conducted a GPS field survey to establish final coordinates of the ground base stations for final processing of the base-remote GPS solutions.
                dateTime:
                  DateTime:  2007-08-01T00:00:00
            processStep:  (LI_ProcessStep)
                description:  Airborne GPS Processing: Airborne GPS data was differentially processed and integrated with the post processed IMU data to derive a smoothed best estimate of trajectory (SBET). The SBET was used to reduce the LiDAR slant range measurements to a raw reflective surface for each flight line. The overlap between flight lines was removed to provide a homogeneous coverage, and the coverage was classified to extract a bare earth digital elevation model (DEM). Airborne GPS is differentially processed using the GrafNAV V7.50 software by Waypoint Consulting of Calgary, Alberta, Canada. The PDOP and distance separation is as follows: 1. IMU data is processed using the PosPac V4.2 software by Applanix Corporation of Richmond Hill, Ontario, Canada. 2. The reflective surface is derived using the ALS Post Processor software by Leica Geosystems GIS & Mapping Division of Atlanta, Georgia. 3. The classification and quality control (QC) of LiDAR data is carried out using TerraScan software by Terrasolid Limited of Helsinki, Finland.
                dateTime:
                  DateTime:  2007-08-01T00:00:00
            processStep:  (LI_ProcessStep)
                description:  IMU data Processing: IMU data provides information concerning roll, pitch, and yaw of collection platform during collection event. IMU information allows the pulse vector to be properly placed in 3D space allowing the distance from the aircraft reference point to be properly positioned on the elevation model surface. IMU data is processed using the PosPac V4.2 software by Applanix Corporation of Richmond Hill, Ontario, Canada.
                dateTime:
                  DateTime:  2007-08-01T00:00:00
            processStep:  (LI_ProcessStep)
                description:  Reflective Surface Generation: The reflective surface is derived using the ALS Post Processor software by Leica Geosystems GIS & Mapping Division of Atlanta, Georgia.
                dateTime:
                  DateTime:  2007-08-01T00:00:00
            processStep:  (LI_ProcessStep)
                description:  LIDAR Point Classification The classification and quality control (QC) of LiDAR data is carried out using TerraScan software by Terrasolid Limited of Helsinki, Finland.
                dateTime:
                  DateTime:  2007-08-01T00:00:00
            processStep:  (LI_ProcessStep)
                description:  Output LAS Files The product output of LiDAR data is carried out using TerraScan software by Terrasolid Limited of Helsinki, Finland. LAS Binary, ascii xyz, and intensity images were created.
                dateTime:
                  DateTime:  2007-08-01T00:00:00
            processStep:  (LI_ProcessStep)
                description:  The NOAA Office for Coastal Management (OCM) received the files in las format in July 2008. The files contained Lidar elevation and intensity measurements. The data was in UTM projection, and NAVD88 Geoid 03 vertical datum. OCM performed the following processing to the data to make it available within the Digital Coast: 1. The data were converted from UTM coordinates to geographic coordinates. 2. The data were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoid) heights using Geoid 03. 3. The LAS data were sorted by latitude and the headers were updated. NOAA OCM also performed a macro level review of this data set. This review involved checking for format and point characteristics in about 5% of the tiles. In addition, the entire data set was reviewed to establish that bare-earth processing and proper classification of the points had been performed. This review did not include accuracy or data-processing (e.g., bare-earth quality, flightline mismatch, feature removal) assessments. Please refer to the Supplemental Information above for more information about this review. In August, 2015 effort were made to add more ground points to this project. For reference to which tiles had ground points prior to this process, please consult the lidar report provided in the Supplemental Information section. LasTools' lasground uses an algorithm to classify 'unclassified' points (only within tile that did not have classified ground points) to that particular 'ground' (Class 2).
                dateTime:
                  DateTime:  2015-08-31T00:00:00
            processStep:  (LI_ProcessStep)
                description:   The vertical values in this data set have been converted to reference North American Vertical Datum of 1988 (NAVD88) (GEOID18) meters, using the GEOID18 grids provided by the National Geodetic Survey. Any datum and projection transformations were then done with the Office for Coastal Management 'datum_shift' program. Compression to an LAZ file was done with the LAStools 'laszip' program and can be unzipped with the same free program (laszip.org) Processing notes:
                dateTime:
                  DateTime:  2023-08-01T07:45:15
                processor:  (CI_ResponsibleParty)
                    individualName:  NOAA Office for Coastal Management
                    contactInfo:  (CI_Contact)
                        address:  (CI_Address)
                            electronicMailAddress:  coastal.info@noaa.gov
                    role:  (CI_RoleCode) processor