NOAA Office for Coastal Management Coastal Inundation Digital Elevation Model: Houston/Galveston, Texas Weather Forecast Office (WFO)

Dataset Identification:

Resource Abstract:
This digital elevation model (DEM) is a part of a series of DEMs produced for the National Oceanic and Atmospheric Administration Office for Coastal Management's Sea Level Rise and Coastal Flooding Impacts Viewer. The DEM includes the best available lidar data known to exist at the time of DEM creation that meets project specifications for those counties within the boundary of the Houston/Galveston TX Weather Forecast Office (WFO), as defined by the NOAA National Weather Service. The counties within this boundary are: Jackson, Matagorda, Brazoria (portion), Harris (portion), Galveston, and Chambers. For all the counties listed, except for Harris, the DEM is derived from LiDAR data sets collected for the Texas Water Development Board (TWDB) in 2006 with a point density of 1.4 m GSD. LiDAR data for Harris County was collected in October 2001 by the Harris County Flood Control District Tropical Storm Allison Recovery Project (TSARP) with a point density of 2.0 m GSD. Hydrographic breaklines used in the creation of the DEM were delineated using LiDAR intensity imagery generated from the data sets. The DEM is hydro flattened such that water elevations are less than or equal to 0 meters. The DEM is referenced vertically to the North American Vertical Datum of 1988 (NAVD88) with vertical units of meters and horizontally to the North American Datum of 1983 (NAD83). The resolution of the DEM is approximately 10 meters.
Citation
Title NOAA Office for Coastal Management Coastal Inundation Digital Elevation Model: Houston/Galveston, Texas Weather Forecast Office (WFO)
alternateTitle  TX_HGX_metadata
publication  Date   2012
presentationForm  imageDigital
other Citation Details  
cited responsible party -
organisation Name  
Contact information
Linkage for online resource
name Citation URL
URL: https://coast.noaa.gov/slr
protocol WWW:LINK-1.0-http--link
link function download
Description Online Resource
cited responsible party -
organisation Name  
Contact information
Linkage for online resource
name Citation URL
URL: https://coast.noaa.gov/
protocol WWW:LINK-1.0-http--link
link function download
Description Online Resource
cited responsible party -
organisation Name  
Contact information
Linkage for online resource
name Citation URL
URL: https://coast.noaa.gov/digitalcoast/tools/slr
protocol WWW:LINK-1.0-http--link
link function download
Description Online Resource
Topic Category:  elevation
Keywords:
Theme keywords (theme):
Bathymetry/Topography
DEM
Digital Elevation Model
elevation
flooding
inundation
lidar
lidar
sea level rise
topography
Theme keywords (theme):
Earth Science > Land Surface > Geomorphic Landforms/Processes > Coastal Processes > Flooding
Earth Science > Land Surface > Geomorphic Landforms/Processes > Coastal Processes > Sea Level Changes
Earth Science > Land Surface > Topography > Terrain Elevation > Digital Elevation/Terrain Model (Dem)
thesaurus name >
Title Global Change Master Directory (GCMD) Science Keywords
Location keywords:
Brazoria County
Chambers County
Galveston County
Harris County
Jackson County
Matagorda County
Texas
US
Location keywords:
Continent > North America > United States Of America > Texas
thesaurus name >
Title Global Change Master Directory (GCMD) Location Keywords
dataCenter Keywords
DOC/NOAA/NOS/OCM > Office of Coastal Management, National Ocean Service, NOAA, U.S. Department of Commerce
thesaurus name >
Title Global Change Master Directory (GCMD) Data Center Keywords
publication  Date   2017-04-24
Edition 8.5
project Keywords
Inundation
purpose:
The NOAA Office for Coastal Management has developed high-resolution digital elevation models (DEMs) for use in the Center's Sea Level Rise And Coastal Flooding Impacts internet mapping application. These DEMs serve as source data sets used to derive data to visualize the impacts of inundation resulting from sea level rise along the coastal United States and its territories.
Resource language:  eng; US
Resource progress code:  completed
Resource Maintenance Information
maintenance or update frequency:  notPlanned
Constraints on resource usage:
Legal Constraints
Access Constraints  otherRestrictions
use constraint:  otherRestrictions
Other constraints
Access Constraints: None | Use Constraints: The data set is provided "as is," without warranty to its performance, merchantable state, or fitness for any particular purpose. The entire risk associated with the results and performance of this dataset are assumed by the user. This data set should be used strictly as a planning reference and not for navigation, permitting, or other legal purposes. | Distribution Liability: Any conclusions drawn from the analysis of this information are not the responsibility of the Office for Coastal Management or its partners.
Constraints on resource usage:
Security Constraints
Classification  unclassified
Classification System 
Handling Description 
Spatial representation type code:  grid
Resource extent
Geographic Extent
Geographic Bounding Box
westBoundLongitude  -97.0199303
eastBoundLongitude  -94.3034426
northBoundLatitude  29.957192
southBoundLatitude  28.245608
Temporal Extent
| Currentness: Ground Condition 2001 2006
Additional information on resource:
All data sets used to construct this DEM are publicly available via the NOAA Office for Coastal Management's Digital Coast (www.coast.noaa.gov/lidar). The data source, year of data collection and the vertical RMSE (Root Mean Square Error) for the constituent lidar data sets used in the creation of this DEM are: County Data Source Year Collected Vertical RMSE Jackson TWDB 2006 18 cm Matagorda TWDB 2006 18 cm Brazoria TWDB 2006 18 cm Harris Harris County Flood Control District (TSARP) 2001 15 cm Galveston TWDB 2006 18 cm Chambers TWDB 2006 18 cm Additional information about the constituent lidar data sets used in the creation of this DEM may be accessed at: https://coast.noaa.gov/dataviewer/webfiles/metadata/tx2006_jackson_template.html https://coast.noaa.gov/dataviewer/webfiles/metadata/tx2006_matagorda_template.html https://coast.noaa.gov/dataviewer/webfiles/metadata/tx2006_brazoria_template.html https://coast.noaa.gov/dataviewer/webfiles/metadata/tx2001_harris_template.html https://coast.noaa.gov/dataviewer/webfiles/metadata/tx2006_galveston_template.html https://coast.noaa.gov/dataviewer/webfiles/metadata/tx2001_chambers_template.htmlSpatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.0000001 Longitude_Resolution: 0.0000001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257222101 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum of 1988 Altitude_Resolution: 0.001 Altitude_Distance_Units: meters Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates
Credits:
Acknowledgment of the NOAA Office for Coastal Management as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices for data source is expected.
point of contact - pointOfContact
individual Name Coastal Management, NOAA Office for
organisation Name  Office for Coastal Management
Contact information
Telephone
Voice (843) 740-1202
Fax 
Address
2234 South Hobson Ave, Charleston, SC, 29405-2413 Country 
electronic Mail Address coastal.info@noaa.gov
Linkage for online resource
name Website
URL: https://www.coast.noaa.gov/
protocol WWW:LINK-1.0-http--link
link function information
Description Website listed for this contact
hoursOfService 
contact Instructions
point of contact - custodian
individual Name Coastal Management, NOAA Office for
organisation Name  Office for Coastal Management
Contact information
Telephone
Voice (843) 740-1202
Fax 
Address
2234 South Hobson Ave, Charleston, SC, 29405-2413 Country 
electronic Mail Address coastal.info@noaa.gov
Linkage for online resource
name Website
URL: https://www.coast.noaa.gov/
protocol WWW:LINK-1.0-http--link
link function information
Description Website listed for this contact
hoursOfService 
contact Instructions
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Grid spatial representation

number of grid dimensions: 3
Grid axis property:
Grid Dimension
Dimension Name:  row
Dimension Size 19020
Grid Dimension
Dimension Name:  column
Dimension Size 30187
Grid Dimension
Dimension Name:  vertical
Dimension Size 1
cell geometry type:  area
transformation parameter availability:  0
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Scope of quality information
scope level  dataset
Resource lineage description
Lineage statement
Processing Step
date and time 2012-01-01T00:00:00
description 1. Lidar source data and hydrographic breaklines were obtained and imported into an ESRI ArcGIS file geodatabase for each constituent county within the WFO boundary. Only ground classified lidar (Class 2) points were used to reflect a bare earth surface. Hydrographic features were assigned elevation values at or below 0 meters. An ESRI Terrain was then generated from these source data. 2. The ESRI Terrain was converted to a DEM (Erdas Imagine .img file format) with a cell size of 3 meters. The DEM was reviewed in Global Mapper for incorrect elevations and artifacts introduced from source inputs or during the raster creation process. Corrections were applied to the DEM and reprocessed for further review. 3. All DEMs for the entire study area (WFO) were loaded into Global Mapper for a final review. The constituent DEMs were then checked to ensure complete coverage within the study area and that no issues existed along the boundary between adjacent DEMs. Once it was determined all DEMs were seamlessly edge-matched and no other artifacts were present, the constituent DEMs were mosaiced together, resampled to 10 m and reprojected to the NAD83 geographic coordinate system.
source
source description  Source Contribution: Lidar points covering Jackson, Matagorda, Brazoria (portion), Harris (portion), Galveston, and Chambers counties were used in developing the DEM. | Type of Source Media: online digital data
source citation
Title NOAA Office for Coastal Management lidar data holdings
publication  Date   2012-01-01
cited responsible party -
organisation Name  
Contact information
Linkage for online resource
name Source Citation URL
URL: https://coast.noaa.gov/dataviewer/
protocol WWW:LINK-1.0-http--link
link function information
Description Source Citation URL
Resource extent
Temporal Extent
2001 2006
AbsoluteExternalPositionalAccuracy
name Of Measure Horizontal Positional Accuracy
evaluation Method Description  The DEM is derived from the source lidar data. Horizontal accuracy testing is not performed on the DEM. Lidar source data assumed to meet 1 meter horizontal accuracy.
AbsoluteExternalPositionalAccuracy
name Of Measure Vertical Positional Accuracy
evaluation Method Description  The DEM is derived from the source lidar data. Vertical accuracy is not tested on the DEM. Project specifications require all source lidar data used in constructing the DEM to meet FEMA Specifications for Flood Hazard Mapping.
Completeness Commission
name Of Measure Completeness Report
evaluation Method Description  A visual qualitative check was performed to ensure data completeness. All available lidar data known at the time of DEM creation that meets project specifications have been used to develop the DEM. Known data gaps may exist where lidar coverage was incomplete.
ConceptualConsistency
name Of Measure Conceptual Consistency
evaluation Method Description  Data covers the project area, defined as the WFO boundary. Elevation data checked for anomalous elevation values outside expected range.

Resource distribution information

Distributor
distributor contact - distributor
individual Name Coastal Management, NOAA Office for
organisation Name  Office for Coastal Management
Contact information
Telephone
Voice (843) 740-1202
Fax 
Address
2234 South Hobson Ave, Charleston, SC, 29405-2413 Country 
electronic Mail Address coastal.info@noaa.gov
Linkage for online resource
name Website
URL: https://www.coast.noaa.gov/
protocol WWW:LINK-1.0-http--link
link function information
Description Website listed for this contact
hoursOfService 
contact Instructions
Digital Transfer Options
Linkage for online resource
name https://coast.noaa.gov/slr
URL: https://coast.noaa.gov/slr
protocol WWW:LINK-1.0-http--link
link function download
Description Online Resource
Digital Transfer Options
Linkage for online resource
name https://coast.noaa.gov/
URL: https://coast.noaa.gov/
protocol WWW:LINK-1.0-http--link
link function download
Description Online Resource
Digital Transfer Options
Linkage for online resource
name https://coast.noaa.gov/digitalcoast/tools/slr
URL: https://coast.noaa.gov/digitalcoast/tools/slr
protocol WWW:LINK-1.0-http--link
link function download
Description Online Resource

Metadata data stamp:  2018-02-08T16:14:41
Metadata Constraints
Legal Constraints
use constraint:  otherRestrictions
Other constraints
Use Constraints: Disclaimer - 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.
Metadata contact - resourceProvider
organisation Name  Office for Coastal Management
Contact information
Telephone
Voice 
Address
2234 South Hobson Avenue, Charleston, SC, 29405-2413
Linkage for online resource
name Website
URL: https://www.coast.noaa.gov/
protocol WWW:LINK-1.0-http--link
link function information
Description Website for this organization
Metadata contact - pointOfContact
individual Name Coastal Management, NOAA Office for
organisation Name  Office for Coastal Management
Contact information
Telephone
Voice (843) 740-1202
Fax 
Address
2234 South Hobson Ave, Charleston, SC, 29405-2413 Country 
electronic Mail Address coastal.info@noaa.gov
Linkage for online resource
name Website
URL: https://www.coast.noaa.gov/
protocol WWW:LINK-1.0-http--link
link function information
Description Website listed for this contact
hoursOfService 
contact Instructions
Metadata scope code  dataset
Metadata language  eng
Metadata character set encoding:   UTF8
Metadata standard for this record:  ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data
standard version:  ISO 19115-2:2009(E)
Metadata record identifier:  gov.noaa.nmfs.inport:48124

Metadata record format is ISO19139-2 XML (MI_Metadata)