Short Citation:
Office for Coastal Management, 2021: Coastal Bend Texas Benthic Habitat Mapping Patchy Shapefile Map - Lower Laguna Madre, https://www.fisheries.noaa.gov/inport/item/47961.

Item Identification

Title: Coastal Bend Texas Benthic Habitat Mapping Patchy Shapefile Map - Lower Laguna Madre
Short Name: tx_coastal_bend_phaseIIa_patchy_srv_p-meta
Status: Completed
Publication Date: 2008-09-17
Abstract:

The NOAA Office for Coastal Management (OCM) requested the creation of benthic habitat data along the southern Texas coast to support the Texas Seagrass Monitoring Program. The benthic habitat map was created from 1m ADS40 digital airborne imagery collected along the Texas coast during 2004 for the National Agriculture Imagery Program. The original raw images were reprocessed into 3-band true color and color-IR orthos. The benthic habitat map was created from resampled 2m mosaicked orthos. Habitat classification was performed through segmentation of the imagery using Definiens Professional and habitat labeling through Classification and Regression Tree (CART) Analysis. The minimum mapping unit is 100m2. This map covers Lower Laguna Madre, which is approximately 800mi2.

Original contact information:

Contact Name: Becky Jordan

Contact Org: Fugro EarthData, Inc.

Title: Project Manager

Phone: 301-948-8550

Email: bjordan@earthdata.com

Purpose:

The NOAA OCM worked cooperatively with the Texas Parks and Wildlife Department (TPWD) and the Texas A&M University, Corpus Christi, Center for Coastal Studies to have benthic habitat data, primarily submerged aquatic vegetation, created for eight bay systems along the southern Texas coast. This project, the phase 2 project, consists of the two remaining bay systems, Lower Laguna Madre and San Antonio/Espiritu Santo Bays. This benthic habitat data will support the recently adopted Texas Seagrass Monitoring Program which calls for the monitoring of seagrass beds along the Texas coast for assessment of status and trends.

Notes:

10117

Supplemental Information:

The geographic extent of the project area is ~800mi2. Benthic habitat data was generated from 2004 NAIP imagery for all estuarine lands data was required for the marine side of the barrier beaches.

Keywords

Theme Keywords

Thesaurus Keyword
Digital Map Benthic habitat
Digital Map Environmental Monitoring
Digital Map Habitat classification
Digital Map ImageryBaseMapsEarthCover
Digital Map Seagrass
Digital Map Submerged aquatic vegetation
Digital Map Texas Seagrass Monitoring Program
Global Change Master Directory (GCMD) Science Keywords Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Benthic
Global Change Master Directory (GCMD) Science Keywords Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Coastal
Global Change Master Directory (GCMD) Science Keywords Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Estuary
ISO 19115 Topic Category environment
ISO 19115 Topic Category imageryBaseMapsEarthCover

Spatial Keywords

Thesaurus Keyword
Geographic Names Information System Gulf of Mexico
Geographic Names Information System Texas
Geographic Names Information System TX
Geographic Names Information System US
Global Change Master Directory (GCMD) Location Keywords Continent > North America > United States Of America > Texas

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: As Needed
Data Presentation Form: Map (digital)
Entity Attribute Overview:

None

Entity Attribute Detail Citation:

Not applicable

Distribution Liability:

Users must assume responsibility to determine the usability of these data.

Data Set Credit: NOAA Office for Coastal Management

Support Roles

Data Steward

CC ID: 614507
Date Effective From: 2008-09-17
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Distributor

CC ID: 614509
Date Effective From: 2008-09-17
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Metadata Contact

CC ID: 614510
Date Effective From: 2008-09-17
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Point of Contact

CC ID: 614508
Date Effective From: 2008-09-17
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Extents

Currentness Reference: Publication Date

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 614513
W° Bound: -97.516227
E° Bound: -97.148929
N° Bound: 26.955027
S° Bound: 25.996454

Extent Group 1 / Time Frame 1

CC ID: 614512
Time Frame Type: Discrete
Start: 2008-09-17

Access Information

Security Class: Unclassified
Data Access Constraints:

None

Data Use Constraints:

None

Distribution Information

Distribution 1

CC ID: 750778
Download URL: ftp://ftp.coast.noaa.gov/pub/benthic/Benthic_Cover_Data/TX_CoastalBend_phaseIIa_patchy_srv_p.zip
Distributor:
File Name: Bulk Download
Description:

FTP download of data files.

Activity Log

Activity Log 1

CC ID: 614532
Activity Date/Time: 2017-03-30
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 614531
Activity Date/Time: 2017-11-14
Description:

Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 717978
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 750779
Activity Date/Time: 2018-04-11
Description:

Partial upload to move data access FTP links to Distribution Info and remove broken URLs.

Technical Environment

Description:

Windows NT/2000 Systems, Definiens Professional, See5, ArcGIS, Erdas Imagine

Data Quality

Accuracy:

Horizontal accuracy of the reprocessed source imagery was verified to be better than 5 meters at 90% confidence level in accordance with National Map Accuracy Standards for a 1-meter GSD. The accuracy of the contractor's final map is 89% and the accuracy of the final map is 90%. Overall final map deterministic accuracy is 88% (with fuzzy accuracy at 90%) which exceeds the contract standard of 85%. Additionally, 14 of the 16 final map class producer's and consumer's accuracies are at 85% which exceeds the contract standard of 80%. However, the deterministic producer's accuracy for emergent marsh is 77%, and the user's accuracy for unconsolidated sediments is 72%.

Horizontal Positional Accuracy:

Accuracy assessment determined by evaluating the horizontal accuracy obtained during the aerotriangulation process for each lift for the reprocessed imagery and by field verification for the completed map product.

Vertical Positional Accuracy:

None

Completeness Report:

Compliance with the accuracy standard for the reprocessed imagery was ensured by the placement of photo identifiable ground control points and the collection of airborne GPS data. Compliance with the accuracy standard for the final map product was ensured by field checks and manual editing.

Conceptual Consistency:

For the reprocessed imagery, compliance with the accuracy standard was ensured by the placement of photo identifiable ground control points. A total of 18 photo identifiable ground survey points was used for the calculations. An RMS value was calculated based on the imagery reprocessed for this project by comparing the aerotriangulated X and Y coordinates. This value represents an estimate of the accuracy of the horizontal coordinate measurements in the tile expressed in meters. For the final map product Initial Map accuracy assessment was used as a tool to prioritize areas for further field examination and after field investigation to prioritize those areas where additional modeling or interpretation was needed. Error matrices showing both deterministic and fuzzy accuracies were compiled for the initial map. Based on the results compiled from the assessment, the team visit any classes exhibiting inaccuracy and addressed the classes through modeling, additional analysis or manual editing.

Lineage

Sources

2004 ADS40 Digital NAIP Imagery

CC ID: 614501
Contact Name: Northwest Geomatics
Publish Date: 2004-11-11
Extent Type: Range
Extent Start Date/Time: 2004-11-03
Extent End Date/Time: 2004-11-07
Scale Denominator: 900
Source Contribution:

The digital orthophotography was developed from imagery acquired as part of the 2004 overflight of the State of Texas developed for the USDA National Agricultural Imagery Program (NAIP). In order to achieve a horizontal accuracy of 5 meters, CE90 it is necessary to reprocess the imagery incorporating new GPS field control. It should be noted that the imagery was not tide coordinated so tidal variation may exist between sorties. The imagery was acquired between November 3, 2004 and November 7, 2004. | Source Geospatial Form: remote-sensing image | Type of Source Media: digital

REPORT OF GPS SURVEY TEXAS COASTAL AREA MAPPING

CC ID: 614500
Contact Name: TerraSurv Inc.
Publish Date: 2005-11-09
Extent Type: Range
Extent Start Date/Time: 2005-10-17
Extent End Date/Time: 2005-10-19
Scale Denominator: 1000
Source Contribution:

TerraSurv, Inc. of Pittsburgh, PA was contracted by EarthData International of Frederick, MD to perform a geodetic control survey in support of mapping an area along the southeasterly coast of Texas between Port Lavaca and Brownsville. Thirty-eight photo identifiable locations were surveyed to provide ground control and quality assurance checks for the mapping. Twenty of the stations were used for mapping control and eighteen of the stations were used for quality checks. The horizontal datum was the North American Datum of 1983, CORS adjustment (NAD 1983 CORS). The vertical datum was the North American Vertical Datum of 1988 (NAVD 1988). | Source Geospatial Form: model | Type of Source Media: paper

Process Steps

Process Step 1

CC ID: 614502
Description:

The original 1m DOQQs for the project area were resampled to 2m and mosaicked. For habitat classification, the mosaicked imagery was divided into two processing areas for Lower Laguna Madre, resulting in a total of four 2m mosaicked orthos: one set of two mosaics for true color and one set of two mosaics for color-IR. Lower Laguna Madre was divided into two processing areas. Image segmentation was performed in Definiens Professional using the blue, green, red, and near-infrared bands for each of the processing areas. The classification of the habitat segments (as ESRI polygon shapefiles) was performed using CART analysis. The habitat maps for each area was refined with the aid of field data collected during July, August, and October of 2007. The two processing area shapefiles were edgematched to one another and clipped to the final project area boundary. Adjacent areas do not overlap, and each polygon, within and across all processing areas and bay systems, has a unique polygon identification number. Each shapefile was checked for proper topology and to insure that each polygon has a correct habitat label, habitat code, modifier label if present, unique identification number, and an area calculation. Polygons below the 100m2 minimum mapping unit (MMU) were eliminated, though some polygons <100m2 were retained if their area changed to below the MMU due to the polygon boundary smoothing process.

Process Date/Time: 2008-09-17 00:00:00
Source: 2004 ADS40 Digital NAIP Imagery

Process Step 2

CC ID: 614503
Description:

The habitat data also went through a NOAA independent validation review. Polygons in the habitat map labeled as Patchy SRV (seagrass) were used to mask the 2m image mosaics for further classification of these areas. Pixels in the imagery falling within the Patchy SRV polygons were classified into a "percent seagrass" cover category. For each Patchy SRV polygon from the habitat map, the average percent seagrass coverage was calculated based on the coverage values of

each pixel within the polygon. Accuracy assessment was performed on seven classes with Patchy SRV and Continuous SRV being combined into a single accuracy class. For field data collection, non-random sites in the form of polygons were chosen by analysts with an attempt to sample all available image signatures. These sites were visited in the field and data on each site was collected directly into digital format (ESRI shapefile) using a laptop or onto a paper form that was later entered into digital format. Sites were navigated to primarily using a Garmin GPS 76 unit connected to a Panasonic Toughbook laptop displaying the project imagery and polygons in ArcMap v9.1 or using the GPS unit alone. Habitat classification was estimated as accurately as possible using different methods or combination of methods which included above water observation, snorkeling, wading, and underwater video. This data was entered into an ESRI shapefile via a digital field form in ArcMap specifically developed for this type of field data collection. More sample polygon sites were collected in-office based on the in-field collected sites in order to meet the 30 sites per class accuracy assessment requirement. For each class, a random selector macro in ArcMap was used to randomly select 30 sites for accuracy assessment. The entire pool of accuracy sites was kept separate from the remaining sites and only used for accuracy assessment during the project. Anonymity of the accuracy sites was maintained throughout the project because it was unnecessary to ever visually review these sites in order to perform the accuracy analysis. More accuracy assessment sites were collected in a later field collection trip to add to the analysis. These sites were chosen by randomly selecting polygons within specific regions that were pre-determined to be visited. Information for these sites was collected using the same methods for the other sites. Accuracy information was compiled using ArcMap. The Zonal Statistics tool in ArcToolbox was used to collect accuracy information from the habitat map using the accuracy polygons. The "mean" statistic was used to determine the map value for each accuracy polygon. An accuracy assessment error matrix was generated using this information by importing it to Microsoft Excel and building the matrix. Both deterministic and fuzzy accuracy assessment were performed. The accuracy analysis and error matrices are presented and discussed in the project final report entitled Coastal Bend of Texas Benthic Habitat Mapping Phase 2 Final Report.

Process Date/Time: 2008-09-17 00:00:00
Source: 2004 ADS40 Digital NAIP Imagery

Catalog Details

Catalog Item ID: 47961
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-14 12:57+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2019-07-02 15:17+0000
Metadata Record Published: 2018-04-11
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2019-04-12