Short Citation:
Office for Coastal Management, 2021: Salt Marsh Habitats, Rhode Island, 2012, https://www.fisheries.noaa.gov/inport/item/63442.

Item Identification

Title: Salt Marsh Habitats, Rhode Island, 2012
Status: Completed
Publication Date: 2019-10-28
Abstract:

This data set consists of salt marsh habitats for the state of Rhode Island derived from high resolution (0.5m) imagery collecting during June 2012. This data set utilized 4 Band multispectral aerial orthoimagery contributed to RIGIS by the Rhode Island Eelgrass Mapping Taskforce [(c) 2012 RIGIS] and LiDAR data collected through the LiDAR for the NorthEast project (2011).

Purpose:

To gauge the health and resilience of Rhode Island's coastal salt marshes and provide baseline data for detecting change over time.

Other Citation Details:

Suggested bibliographic reference: RIGIS, 2017. Salt Marsh Habitats; saltmarsh12. Rhode Island Geographic Information System (RIGIS) Data Distribution System, URL: http://www.rigis.org, Environmental Data Center, University of Rhode Island, Kingston, Rhode Island (last date accessed: 20 June 2017).

Supplemental Information:

Attributes for this product are as follows:

0 Background

1 Unclassified (Cloud, Shadow, etc)

2 Invasive Phragmites australis

3 High Marsh; S.patens-D.spicata

4 Mudflat/bare

5 Open Water

6 Dieoff Depression

7 Natural Pool

8 Salt Shrub

9 High Marsh; S.alterniflora

10 High Marsh; Mix

11 Low Marsh

12 Brackish Marsh, Native

13 High Marsh; J.gerardii

14 Wrack

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Instrument Keywords Earth Remote Sensing Instruments > Passive Remote Sensing > Photon/Optical Detectors > Cameras > CAMERAS
Global Change Master Directory (GCMD) Platform Keywords Aircraft > AIRCRAFT
Global Change Master Directory (GCMD) Science Keywords Earth Science > Land Surface > Land Use/Land Cover
Global Change Master Directory (GCMD) Science Keywords Earth Science > Land Surface > Land Use/Land Cover > Land Use/Land Cover Classification
ISO 19115 Topic Category imageryBaseMapsEarthCover
None Biota
None Remotely Sensed Imagery/Photos
None Salt Marsh
None Wetlands

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords Ocean > North America > United States of America > Rhode Island
None Coastal Zone
None Rhode Island
None RI

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: GIS Files
Data Presentation Form: Vector
Distribution Liability:

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

Support Roles

Data Steward

CC ID: 1006548
Date Effective From: 2021-01-13
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: 1006550
Date Effective From: 2021-01-13
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: 1006551
Date Effective From: 2021-01-13
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: 1006549
Date Effective From: 2021-01-13
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: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1006561
W° Bound: -71.8926
E° Bound: -71.1655
N° Bound: 41.6885
S° Bound: 41.1731

Extent Group 1 / Time Frame 1

CC ID: 1006560
Time Frame Type: Discrete
Start: 2012-06-01

Spatial Information

Spatial Representation

Representations Used

Grid: No

Access Information

Security Class: Unclassified
Data Access Constraints:

None

Data Use Constraints:

Data set is not for use in litigation. While efforts have been made to ensure that these data are accurate and reliable within the state of the art, NOAA, cannot assume liability for any damages, or misrepresentations, caused by any inaccuracies in the data, or as a result of the data to be used on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. This dataset is provided 'as is.’ The producer(s) of this dataset, contributors to this dataset, the Rhode Island Geographic Information System (RIGIS) consortium, the State of Rhode Island, and the University of Rhode Island do not make any warranties of any kind for this dataset, and are not liable for any loss or damage however and whenever caused by any use of this dataset. Please acknowledge both RIGIS and the primary producer(s) of this dataset in any derived products. Versions of the RIGIS logo suitable for both printed and web-based products are available at http://www.rigis.org/logos.

URLs

URL 1

CC ID: 1006553
URL: https://coast.noaa.gov/htdata/raster1/landcover/bulkdownload/marshhabitat/
URL Type:
Online Resource

URL 2

CC ID: 1006554
URL: https://coast.noaa.gov/digitalcoast/data/ccaphighres
URL Type:
Online Resource

URL 3

CC ID: 1006562
URL: https://www.rigis.org/datasets/salt-marsh-habitats-2012
Name: Rhode Island GIS
Description:

Rhode Island GIS website

Technical Environment

Description:

Version 6.2 (Build 9200) ; Esri ArcGIS 10.5.0.6491

Data Quality

Accuracy:

According to accuracy assessment performed by the Narragasett Bay NERR , the overall accuracy for the classification is 82.7% and 0.804 Kappa. Each class accuracy is as follows: (Errors of Omission/Commission)

0 Background (N/A)

1 Unclassified (Cloud, Shadow, etc)(N/A)

2 Invasive Phragmites australis (100%/96%) 3 High Marsh; S.patens-D.spicata (80%/82%)

4 Mudflat/bare (100%/93%)

5 Open Water (95%/95%)

6 Dieoff Depression (78%/93%)

7 Natural Pool (91%/87%)

8 Salt Shrub (80%/100%)

9 High Marsh; S.alterniflora (85%/62%)

10 High Marsh; Mix (31%/56%)

11 Low Marsh (67%/100%)

12 Brackish Marsh, Native (0%/0%)

13 High Marsh; J.gerardii (75%/100%)

14 Wrack (100%/100%)

Given that development of this dataset was initiated several years after the collection of the imagery, some compromises were made in the assessment of it's accuracy. In an effort to evaluate the map using field data collected as close to the acquisition date of the imagery as possible, a subset of transects from the Rhode Island Salt Marsh Assessment (RISMA) were utilized. This restricted the ability to follow certain best practices associated with the accuracy assessment of maps derived from remotely sensed imagery. As such, we were unable to employ a stratified random sampling strategy or use an adequate number of samples for all of the categories included in the map. 237 accuracy assessment points were used but none of the classes have a minimum of 50 accuracy assessment points. While the accuracy assessment conducted does help inform us about the map's errors, there are shortcomings as an overall representation. It is hoped that a more complete field effort can be performed as part of a future update to this data.

Horizontal Positional Accuracy:

< 2 meters CE95

Vertical Positional Accuracy:

There was no terrain correction in the geo-referencing procedure.

Conceptual Consistency:

Tests for logical consistency indicate that all row and column positions in the selected latitude/longitude window contain data. Conversion and integration with vector files indicates that all positions are consistent with earth coordinates covering the same area. Attribute files are logically consistent.

Lineage

Process Steps

Process Step 1

CC ID: 1006558
Description:

This data set was created by NOAA Office of Coastal Management (NOAA OCM). This version of the classification was created by the Narragansett Bay National Estuarine Research Reserve (NBNERR) and partner agencies to include multiple vegetation communities that individually and collectively indicate aspects of marsh health. This section outlines the classification procedure for the Rhode Island Salt Marsh Habitats maps. This product was developed through a partnership between NBNERR and the NOAA OCM. The product was derived from high resolution 4 band digital imagery in combination with derivatives from LiDAR data. The mapping methodology employed an Object Based Image Analysis (image segmentation) approach. Data Preparation: The aerial imagery was supplied to NOAA OCM by NBNERR. Orthoimagery from the spring of 2012 was pre-processed into spectral indices and band derivatives. LiDAR data collected through the LiDAR for the NorthEast project (2011) were processed into elevation and surface models. Field Data Collection: Field samples were collected prior to (August 2014) and during (June 2015) the mapping effort. Salt Marsh Extent Classification: Image segmentation was performed in Trimble's eCognition Developer software package. The resulting image objects or segments were classified using modeling routines which leveraged existing wetland datasets acquired from RIGIS. Boundaries were refined using spectral and elevation information. The final extent was used to focus the supervised habitat classification process. Salt Marsh Habitat Classification: A new set of image objects were derived within the salt marsh extent boundary. The resulting image objects classified into habitat classes using a Random Forest classifier. Logical rule sets and contextual modeling were used to introduce classes such as Dieoff Depressions and Natural Pools and to improve, and refine the habitat classification. Anomalies in the classification that were not addressed through the automated processes were corrected through manual editing. Review and Map Finalization: Once various stages of the salt marsh extent and habitat classification processing were completed, the resulting maps were provided to the Narragansett Bay NERR and other local experts for comments. The majority of the resulting feedback was incorporated to improve the final habitat dataset. Attributes for this product are as follows: 0 Background 1 Unclassified 2 Invasive Phragmites australis 3 High Marsh; S.patens-D.spicata 4 Mudflat /Bare 5 Open Water 6 Dieoff Depression 7 Natural Pool 8 Salt Shrub 9 High Marsh; S.alterniflora 10 High Marsh; Mix 11 Low Marsh 12 Brackish Marsh, Native 13 High Marsh; J.gerardii 14 Wrack

Process Date/Time: 2017-03-17 00:00:00

Catalog Details

Catalog Item ID: 63442
Metadata Record Created By: Erik Hund
Metadata Record Created: 2021-01-13 19:48+0000
Metadata Record Last Modified By: Erik Hund
Metadata Record Last Modified: 2021-01-13 20:29+0000
Metadata Record Published: 2021-01-13
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2022-01-14