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Office for Coastal Management, 2023: Klawock Lagoon, Alaska Benthic Habitats 2011 Substrate,

Item Identification

Title: Klawock Lagoon, Alaska Benthic Habitats 2011 Substrate
Short Name: ak_kl11-substrate_Metadata
Status: Completed
Publication Date: 2015

The Klawock River on Alaska's Prince of Wales Island drains a 29,061 acre watershed with 132 miles of streambed habitat supporting seven salmon and trout species. Traditionally the river and lagoon supported salmon harvests exceeding 30,000 fish annually. The salmon fishery is an important economic factor and food source in the Klawock area. It is also an important cultural resource to local inhabitants. In 1964 a causeway was constructed blocking access to the lagoon from adjacent Klawock Bay. This has resulted in dramatic decreases in salmon harvests. The Nature Conservancy has lead a broad partnership to construct a culvert through the causeway thus re-establishing free passage between the river and Klawock Bay which is expected to help restore a full use of the river as spawning habitat by salmon and generally improve the quality of the lagoon. Benthic habitats in the lagoon and adjacent Klawock Bay and Klawock Harbor were mapped in spring 2011 to establish a baseline of benthic communities in the area with emphasis on eelgrass beds which are essential to the early survival of salmon fry. The habitat map will guide ongoing monitoring activities in the lagoon and form the basis of future change detection efforts.

Aerial multi-spectral imagery was collected over the lagoon, bay, and harbor during the week of April 19, 2011. The mission was timed to coincide with the breaching of the causeway. The environmental considerations important to successful benthic mapping were incorporated into the mission planning. These included, imagery to be collected within 1.5 hours of a zero or negative tide, clear water conditions (no algal blooms, or sediment plumes from runoff), low winds to avoid surface waves, and sufficient solar illumination to image submerged areas. These collection parameters were defined by the Office for Coastal Management prior to collection of the imagery. Despite weather and water conditions which were not ideal, imagery adequate to map most of the habitats in the lagoon was successfully collected on April 19, 2011.

Eelgrass habitats in the Lagoon did not have sufficient biomass or illumination through the water column at the time of the aerial mission to be mapped from that source so eelgrass habitats were determined by two field-digitizing processes, one in August 2010 and one in September 2011. The final hybrid map captures habitats 10m x 10m or larger and has the same positional accuracy as the source imagery.

Field data to guide the mapping was supplied by several project partners. A comparison between the field data and the map shows high levels of agreement, although no traditional quantitative accuracy assessment was conducted.

Original contact information:

Contact Org: NOAA Office for Coastal Management

Phone: 843-740-1202



The data was developed to establish a baseline of benthic habitats in the lagoon and support future change detection activities. These data contribute to assessing conditions prior to opening of a new culvert between the Klawock River, the lagoon, and Klawock Bay to re-establish salmon use of the Klawock River. The focus of the mapping was on shallow water benthic habitats with particular concern for eelgrass meadows.



Supplemental Information:

The study area covers Klawock Lagoon, Klawock Harbor, and Klawock Bay, Borough of Juneau, Alaska.


Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
Global Change Master Directory (GCMD) Science Keywords
Global Change Master Directory (GCMD) Science Keywords
ISO 19115 Topic Category
None Benthic
None Coastal and Marine Ecological Classification Standard
None Environmental Monitoring
None Habitat
None Substrate Component
None The Nature Conservancy

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
None Alaska
None Klawock Bay
None Klawock Harbor
None Klawock Lagoon
None U.S.

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)
Distribution Liability:

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.

Support Roles

Data Steward

CC ID: 609580
Date Effective From: 2015
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


CC ID: 609582
Date Effective From: 2015
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Metadata Contact

CC ID: 609583
Date Effective From: 2015
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Point of Contact

CC ID: 609581
Date Effective From: 2015
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 609586
W° Bound: -133.105445
E° Bound: -133.074666
N° Bound: 55.558106
S° Bound: 55.542561

Extent Group 1 / Time Frame 1

CC ID: 609585
Time Frame Type: Discrete
Start: 2011-04-19

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Vector Representation 1

CC ID: 609572
Complex Object Present?: Yes
Complex Object Count: 569

Access Information

Security Class: Unclassified
Data Access Constraints:

Data is available upon request

Data Use Constraints:


Distribution Information

Distribution 1

CC ID: 750196
Download URL:
File Name: Bulk Download

FTP download of data files.



CC ID: 750198
Name: CMECS Home Page
URL Type:
Online Resource

Information and resources on the CMECS standard and how to apply it


CC ID: 750199
Name: CMECS Catalog
URL Type:
Online Resource

Searchable online catalog of CMECS units, descriptions, and source references


CC ID: 750200
Name: NOAA's Office for Coastal Management (OCM) Digital Coast Data section
URL Type:
Online Resource

The website provides not only coastal data, but also the tools, training, and information needed to make these data truly useful. Content comes from many sources, all of which are vetted by NOAA.


CC ID: 750201
Name: NOAA's Office for Coastal Management (OCM) website
URL Type:
Online Resource

Information on the NOAA Office for Coastal Management (OCM)


CC ID: 750202
Name: Browse Graphic
URL Type:
Browse Graphic
Browse Graphic
File Resource Format: JPEG

Sample of benthic cover data

Activity Log

Activity Log 1

CC ID: 609606
Activity Date/Time: 2017-03-30

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 609605
Activity Date/Time: 2017-11-14

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

Activity Log 3

CC ID: 717599
Activity Date/Time: 2018-02-08

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 750197
Activity Date/Time: 2018-04-11

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

Data Quality


Polygon labels and boundaries were visually inspected for delineation precision and attribute accuracy. In August 2011 a draft habitat map was reviewed by OCM staff and project partners to identify areas of error or confusion. The users did not identify any significant errors in the map. In September, TNC staff visited 59 sites in the bay and lagoon and collected field photography to refine the map and further assess its quality. These field photos were collected at pre-selected sites to confirm conditions on the ground. A hand-held GPS unit was used to ensure that the photo was taken to obtain a coordinate for the photo to ensure successful comparison to the map. In this initial assessment, X of X photos were in agreement with the draft map.

Horizontal Positional Accuracy:

An independent NSSDA spatial accuracy assessment was not performed on the imagery; however, imagery from the GeoScanner system typically produces ortho-rectified products with a spatial accuracy meeting or exceeding +/- 3m of position on the group CE95.

Completeness Measure:

Cloud Cover: 0

Completeness Report:

Minimum mapping unit for habitat polygons was 100 square meters. The study area boundary for the project was defined by TNC. Benthic habitat features were captured and classified according to the rules, conventions, and descriptions in the Statement of Work.

Conceptual Consistency:

Polygon topology present. Every polygon has a label, there are no multiple labels within polygons, there are no contiguous polygons.



2011 Benthic Habitat GeoScanner Imagery

CC ID: 609567
Contact Name: Geovantage, Inc
Publish Date: 2011-01-01
Extent Type: Discrete
Extent Start Date/Time: 2011-04-19
Scale Denominator: 12000
Source Contribution:

photographic signature for interpretation of benthic habitat data. | Type of Source Media: Digital orthophotos

Process Steps

Process Step 1

CC ID: 609568

The imagery was flown on 4/19/2011 between 9:35 and 10:24 A.M. by Geovantage Inc. The horizontal spatial accuracy of the imagery reported by the vendor is within +/- 3 meters CE95 of position on the ground. The radiometric resolution of the 4 band image composites is 12-bit. The imagery was processed to remove atmospheric effects such as haze and to highlight the spectral response of submerged areas. The imagery has some exposure variation between adjacent flight lines and between sunlit and cloud shaded areas. The 4 band imagery is provided in GeoTIFF format. The imagery was captured at a spatial resolution (pixel size) of 0.25m x 0.25m and was delivered in a Universal Transverse Mercator - Zone 8 projection using the NAD1983 datum.

Process Date/Time: 2011-04-01 00:00:00

Process Step 2

CC ID: 609569

The benthic habitat map was developed through image segmentation using the Trimble eCognition Developer software. Image segments representing spectrally homogenous area in the source imagery were generated using a scale factor 20-25. A draft map was generated by classifying the image segments into one of 5 habitat classes (coastal marsh, unconsolidated sediments, unconsolidated bottom, macroalgae, and eelgrass) using the Nearest Neighbor classifier in Trimble eCognition Developer. Training data was derived through photo interpretation using available provided field information as a reference. The resulting draft map was reviewed by the project team through visual inspection and comparison to ground photos. Additional edits were made through manual labeling of the segments. Due to poor water clarity in Klawock Lagoon eelgrass habitat boundaries in the lagoon were generated by staff kayaking along the perimeter of the beds with a GPS logging their position every second. Two of these kayak-digitized polygons (one collected in August 2010 and one in September 2011) were merged to create a maximum extent of eelgrass polygon which was incorporated into the final benthic habitat map.

Process Date/Time: 2011-10-01 00:00:00

Process Step 3

CC ID: 609570

The data were converted from a single ESRI polygon shapefile classified according to the System for Classifying Habitats in Estuarine and Marine Environments (SCHEME) to the Coastal and Marine Ecological Classification Standard (CMECS) 2012 format (which can be found at which produces separate geoform, substrate, and substrate feature layers from the original input benthic habitat dataset. This substrate feature layer contains CMECS substrate component attributes where an "Equal" or "Nearly Equal" SCHEME value was present in the original data. Polygons for which no substrate information was present have been removed. No other changes to the original polygon boundaries or any other alterations of the original SCHEME data were made during this process.

Process Date/Time: 2015-01-01 00:00:00

Child Items

Rubric scores updated every 15m

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Catalog Details

Catalog Item ID: 47849
GUID: gov.noaa.nmfs.inport:47849
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: 2023-05-30 18:09+0000
Metadata Record Published: 2018-04-11
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2018-04-11
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2019-04-11