Dataset Identification:
- These data are the lidar points collected for FEMA Risk Mapping, Assessment, and Planning (Risk MAP) for the Nashua River Watershed. This area falls in portions of Hillsborough County in New Hampshire and portions of Middlesex and Worcester counties in Massachusetts. Using a Leica ALS60 LiDAR system, a total of 35 flight lines of high density (Nominal Pulse Spacing of 2.0 m) were collected over the Nashua area which encompasses 530.3 square miles. A total of 3 missions were flown on May 6, 2011 and May 7, 2011. One airborne global positioning system (GPS) base station was used to support the LiDAR data acquisition: FIT B. The data were received by the NOAA Office for Coastal Management from NH GRANIT. For data storage and Digital Coast provisioning purposes the data were: 1. Converted from UTM Zone 19, meters, NAD83 to geographic coordinates. 2. Converted from NAVD88 (Geoid09), meters to ellipsoid heights, using Geoid09 3. Converted overlap points that were classified as 11 to class 12 (Overlap). Data available for download from the Digital Coast include the following classifications: 1. 1 (Unclassified) 2. 2 (Ground) 3. 7 (Low Point Noise) 4. 9 (Model Key Points) 5. 12 (Overlap)
- Title 2011 FEMA Risk Mapping, Assessment, and Planning (Risk MAP) Lidar: Nashua River Watershed (Massachusetts, New Hampshire)
- publication Date 2013-07-18
- organisation Name NOAA's Ocean Service (NOS), Office for Coastal Management (OCM)
- Contact information
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- Address
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- , Charleston, SC
- organisation Name Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office for Coastal Management (OCM)
- organisation Name Federal Emergency Management Agency (FEMA)
- organisation Name
- Contact information
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- Linkage for online resource
- organisation Name
- Contact information
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- Linkage for online resource
- organisation Name
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- Linkage for online resource
- organisation Name
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- Linkage for online resource
Theme keywords (theme):
Bathymetry/Topography
Land Surface
Topography
Digital Terrain Model
Elevation Data
LIDAR
Ground Control
Point Cloud
LAS Point Files
Bare Earth
- Title None
Location keywords:
United States
Massachusetts
New Hampshire
Nashua River Watershed
Hillsborough County
Middlesex County
Worcester County
- Title None
purpose:
Browse image (thumbnail):
- maintenance or update frequency: unknown
- Constraints
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- Use limitation statement:
- No warranty expressed or implied is made by FEMA regarding the utility of the data on any other system nor shall the act of distribution constitute any such warranty. Any conclusions drawn from the analysis of this information are not the responsibility of FEMA, NH GRANIT, the NOAA Office for Coastal Management or its partners.
- Legal Constraints
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- use constraint: otherRestrictions
- Other constraints
- 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.
- Legal Constraints
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- Access Constraints otherRestrictions
- Other constraints
- Access Constraints: None
Resource extent
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- westBoundLongitude -71.987399
- eastBoundLongitude -71.425869
- northBoundLatitude 42.820656
- southBoundLatitude 42.315652
Geographic Bounding Box - Temporal Extent
Geographic Extent
2011-05-06
2011-05-07
- The FEMA Nashua River HUC 8 LiDAR FY2010 report may be accessed at: ftp://coast.noaa.gov/pub/DigitalCoast/lidar1_z/geoid12a/data/2513/supplemental/Nashua_River_HUC_8_01070004_Terrain_TSDN.pdf A footprint of this data may be viewed in Google Earth at: ftp://coast.noaa.gov/pub/DigitalCoast/lidar1_z/geoid12a/data/2513/supplemental/2011_FEMA_Nashua_River_Watershed_Lidar.kmz
- Acknowledgement of FEMA would be appreciated in products derived from these data. This digital data is produced for the purposes of updating/creating a DFIRM database. Ground control and quality control checkpoints were collected by CompassData, Inc. LiDAR was acquired and processed by Photo Science, Inc. Quality Control testing was performed by CompassData, Inc. Quality Assurance testing was conducted by Greenhorne & O'Mara, Inc. All firms were under contract to STARR, A Joint Venture which held the FEMA contract and task order for this work.
- organisation Name NH GRANIT
- Contact information
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- Telephone
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- Voice 603-862-1792
- Address
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- UNH, Institute for the Study of Earth, Oceans, and Space Complex Systems Research Center, 8 College Rd., Morse Hall, Durham, NH, 03824 Country US
- electronic Mail Address granit@unh.edu
Content information: feature catalog description
- Included With Dataset
Data quality information
Scope of quality information
- source
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- source description Source Contribution: Control points for tying LiDAR data to the ground surface.Source Type: DIGITAL
- source citation
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- Title Ground_Control Nashua
- publication Date 2011-01-01
- cited responsible party - originator
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- organisation Name STARR
Resource extent
- Temporal Extent
2011-01-28
- source description Source Contribution: Quality Assurance points to confirm LiDAR data meets vertical accuracy requirements.Source Type: DIGITAL
- source citation
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- Title FVA_CVA Nashua
- publication Date 2011-01-01
- cited responsible party - originator
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- organisation Name STARR
Resource extent
- Temporal Extent
2011-01-28
- source description Source Contribution: Shapefile of Nashua LiDAR acquisition area.Source Type: DIGITAL
- source citation
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- Title Nashua_Collection_Area
- publication Date 2011-01-01
- cited responsible party - originator
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- organisation Name STARR
Resource extent
- Temporal Extent
2011-07-15
- source description Source Contribution: Point Cloud (All Returns) LAS point files named according to Nashua Tile Index.Source Type: DIGITAL
- source citation
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- Title All_Returns
- publication Date 2011-01-01
- cited responsible party - originator
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- organisation Name STARR
Resource extent
- Temporal Extent
2011-07-15
- source description Source Contribution: Document contains the operations plans for the LiDAR acquisition.Source Type: DIGITAL
- source citation
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- Title Nashua_PreFlightReport
- publication Date 2011-01-01
- cited responsible party - originator
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- organisation Name STARR
Resource extent
- Temporal Extent
2011-07-15
- source description Source Contribution: Document contains the acquisition and calibration report for the LiDAR acquisitionSource Type: DIGITAL
- source citation
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- Title Nashua_PostFlightReport
- publication Date 2011-01-01
- cited responsible party - originator
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- organisation Name STARR
Resource extent
- Temporal Extent
2011-07-15
- source description Source Contribution: Shapefile of tile index used to populate and reference the LAS tiled data.Source Type: DIGITAL
- source citation
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- Title Nashua_Tile_Index
- publication Date 2011-01-01
- cited responsible party - originator
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- organisation Name STARR
Resource extent
- Temporal Extent
2011-07-15
- source description Source Contribution: Document contains QC test results for both FVA and CVA blind check point tests against open area and bare earth surfaces generated from All Returns and Bare Earth (respectively) LAS points. Source Type: DIGITAL
- source citation
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- Title Region 1 Nashua Testing Results FVA CVA
- publication Date 2011-01-01
- cited responsible party - originator
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- organisation Name STARR
Resource extent
- Temporal Extent
2011-07-15
- source description Source Contribution: Contains complete narrative on the acquisition and processing of the LiDAR dataset, includes area diagrams, reports and metadata. Source Type: DIGITAL
- source citation
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- Title R1_Nashua_Terrain_TSDN
- publication Date 2011-01-01
- cited responsible party - originator
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- organisation Name STARR
Resource extent
- Temporal Extent
2011-07-15
- source description Source Contribution: Bare Earth LAS point files named according to the Nashua_Tile_Index.Source Type: DIGITAL
- source citation
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- Title Bare_Earth
- publication Date 2011-01-01
- cited responsible party - originator
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- organisation Name STARR
Resource extent
- Temporal Extent
2011-07-15
- name Of Measure Vertical Positional Accuracy Report
- evaluation Method Description Deliverables were tested by for both vertical and horizontal accuracy. The vertical unit of the data file is in meters with 2-decimal point precision. Consolidated Vertical Accuracy (CVA) tested 18.5 cm at 95th percentile in: open terrain, forest terrain, and urban terrain. The Root Mean Square Error (RMSE) for the elevation differences between GPS control points and lidar points is 9.4 cm calculated with 20 supplemental vertical accuracy (SVA) points. Fundamental Vertical Accuracy (FVA) tested 17.2 cm at 95 percent confidence level in open terrain using RMSEz x 1.9600. The Root Mean Square Error (RMSE) for the elevation differences between GPS control points and lidar points is 8.8 cm calculated with 20 FVA points. The Region_1_Nashua_Testing_Results_FVA_CVA.pdf may be accessed at: ftp://coast.noaa.gov/pub/DigitalCoast/lidar1_z/geoid12a/data/2513/supplemental/Region_1_Nashua_Testing_Results_FVA_CVA.pdf
- name Of Measure Vertical Positional Accuracy
- measure Description The Root Mean Square Error (RMSE) for the elevation differences between GPS control points and lidar points in open terrain is 8.8 cm calculated with 20 Fundamental Vertical Accuracy (FVA) points.
- Quantitative Result
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- result value 0.088
- value Units
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- evaluation Method Description Survey data have been checked for completeness; points have been collected in correct vegetation units, and distributed throughout the AOI. The terrain data have been checked for completeness against AOI polygons. No gaps as defined by FEMA Procedural Memo No. 61 are known to exist within the dataset.
- measure Description Survey data have been confirmed to be in proper units, coordinate systems and format. The terrain data have been confirmed as complete LAS format data files. Header files are in proper LAS format with content as specified by FEMA Procedural Memo No. 61.
Resource distribution information
Distributor
- organisation Name NOAA Office for Coastal Management
- Contact information
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- Telephone
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- Voice 843-740-1202
- Address
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- 2234 South Hobson Avenue, Charleston, SC, 29405-2413
- electronic Mail Address coastal.info@noaa.gov
- maintenance or update frequency: annually
- notes: This metadata was automatically generated from the FGDC Content Standards for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2015-06-17 version of the FGDC RSE to ISO 19115-2 transform.
- notes: Translated from FGDC 2015-07-30T11:27:34.885-04:00
- organisation Name NOAA Office for Coastal Management
- Contact information
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- Telephone
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- Voice 843-740-1202
- Address
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- 2234 South Hobson Avenue, Charleston, SC, 29405-2413
- electronic Mail Address coastal.info@noaa.gov