Rhode Island Eelgrass Mapping Task Force - 2012 Orthophotography Project

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:

Rhode Island Eelgrass Mapping Task Force, National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC)

Publication_Date: 201210

Title:

Rhode Island Eelgrass Mapping Task Force - 2012 Orthophotography Project

Geospatial_Data_Presentation_Form: remote-sensing image

Publication_Information:

Publication_Place: Kingston, RI

Publisher: University of Rhode Island Environmental Data Center

Online_Linkage: <http://www.rigis.org>

Description:

Abstract:

The Rhode Island Eelgrass Mapping Task Force collected 4-band, 0.5-meter spatial resolution orthophotography June 28 and 30, 2012. Data set contains 5000 by 5000 feet digital orthophotography mosaics. The digital orthophotos in this series have a nominal ground resolution of 0.5 meters. The digital orthophoto mosaics are four band, 12-bit GeoTIFFs and are color balanced to be uniform while still maintaining as much of the original color and appearance as practical. The source imagery was flown on June 28 and 30, 2012 with a Z/I DMC camera. The primary project area includes the entire shoreline of Rhode Island including the coastal ponds or lagoons that are found on the south shore. The shoreline of Block Island is also included in this project. This area includes approximately 943 square kilometers of intertidal and sub tidal habitats.

Purpose:

The purpose of this project was to produce aerial photographs that may be used to document the extent of submerged aquatic vegetation in Narragansett Bay and Rhode Island coastal waters. Conservation and management efforts linking marine and terrestrial environments are currently hampered by the relative lack of data for estuarine and marine areas in comparison to terrestrial areas. The prioritization process identified the need to acquire digital area imagery within the study area. The coastal waters of Rhode Island including Narragansett Bay, coastal ponds, and sounds of Rhode Island and Block Island are the economic, commercial, and recreational lifeline of the state. Most aerial imagery collected for the state focus on the terrestrial part of the state while ignoring the water. This project collected imagery that maximizes the potential to delineate of coastal, estuarine, and marine features. This project collected imagery that will aid in the long-term management and provide a framework for conservation and management across the land-sea interface. These efforts provide important and replicable data and an information framework for ecosystem-based coastal and marine conservation planning and implementation that can serve as a model for other New England estuaries.

Supplemental_Information:

Environmental conditions of acquisition: * Turbidity: Imagery was acquired when turbidity was low, not immediately following heavy rains or persistent strong winds. * Tidal Stage: Imagery was acquired within two hours on either side of a low tide. * Wind and Surface Waves: No wind or waves were optimal for imagery acquisition. Low wind under 10 mph was also acceptable. * Sun Angle: A sun angle between 20 and 60 degrees were optimal. Solar glint or glare on the imagery is minimal. * Cloud and Haze: Clouds, cloud shadows and haze which obstruct benthic habitat are not permitted. Orthophoto radiometric resolution of the four band image composites is 12-bit, with a 0.5 m pixel (1.64042 feet). The horizontal spatial accuracy of the imagery is within +/- 2 meters CE95 of position on the ground. Imagery was prodcessed to remove atmospheric effects such as haze and to highlight the spectral response of submerged areas. The imagery has a miniimal exposure variation between adjacent flight lines. The 4 band imagery tiled and named according to the existing USGS digital ortho quarter quad boundaries in GeoTIFF format. The imagery were delivered in Rhode Island State Plane (ft) NAD1983 coordinate system.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20120628

Ending_Date: 20120630

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -71.967032

East_Bounding_Coordinate: -71.035851

North_Bounding_Coordinate: 41.865490

South_Bounding_Coordinate: 41.083201

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: imageryBaseMapsEarthCover

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: aerial

Theme_Keyword: photograph

Theme_Keyword: shoreline

Theme_Keyword: coastal

Theme_Keyword: digital orthophotography

Theme_Keyword: mosaic

Theme_Keyword: rectified image

Theme_Keyword: orthophoto

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Rhode Island

Place_Keyword: Coastal Zone

Place_Keyword: Block Island

Place_Keyword: Narragansett Bay

Access_Constraints: None.

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. We do request that you credit the National Oceanic and Atmospheric Administration (NOAA) when you use these photos in a report, publication, or presentation. This dataset is provided for reference only. These data were created for informational, planning and guidance use only. They are a general reference, not a legally authoritative source for the location of natural or manmade features. Proper interpretation of these data may requre the assistance of appropriate professional services. The cartographic representations depicted have not been verified by a RI Registered Professional Land Surveyor and are not intended to be used in place of a survey. The producer makes no warranty, express or implied, related to the accuracy, reliability, completeness, or currentness of these data. 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.edc.uri.edu/rigis/logos>.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: University of Rhode Island - Environmental Data Center

Contact_Person: Mike Bradley

Contact_Position: Research Associate

Contact_Address:

Address_Type: mailing and physical address

Address: University of Rhode Island

Address: Department of Natural Resources Science

Address: 105 Coastal Institute Kingston

City: Kingston

State_or_Province: RI

Postal_Code: 02881-0804

Country: USA

Contact_Voice_Telephone: 401-874-5054

Contact_Electronic_Mail_Address: mike@edc.uri.edu

Data_Set_Credit:

This data set was developed for the Rhode Island Eelgrass Mapping Task Force and NOAA by Photo Science, Inc.

Native_Data_Set_Environment:

The data set was created on Windows 7 operating system clients running ZI Imaging's Ortho Pro, ArcGIS, and MicroStation.

Data_Quality_Information:

Logical_Consistency_Report:

Imagery was collected with a Z/I DMC camera. Imagery was orthorectified to a USGS DEM using Z/I Intergraph OrthoPro. Seamlines were drawn and then mosaics were also cut using Z/I Intergraph OrthoPro. Mosaics were checked to ensure they were free of artifacts.

Completeness_Report:

The extent of image coverage is limited to the study area and acquired flight lines which were planned to map the shoreline and therefore may not include all areas within the bounding coordinates.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The horizontal positional accuracy and the assurance of that accuracy are dependent upon the accuracy of the data inputs to the rectification process. These data inputs include the digital elevation model (DEM), accuracy of control, and methodology used to georeference the imagery that meet NOAA's Coastal Mapping Program standards.

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value: 2 meters

Horizontal_Positional_Accuracy_Explanation:

These data are accurate with a 95% circular error confidence level.

Lineage:

Process_Step:

Process_Description:

Ortho Rectification Photo Science's digital orthorectification process relies on four primary production data sources including digital aerial imagery, camera calibration data, airborne control, and the existing DEM as described above. Photo Science rectified all of the image frames to minimize the effects of radial displacement and to ensure radiometric consistency. The rectification process employed a bilinear interpolation re-sampling method. Intergraph OrthoPro software was used to accomplish the rectification of the individual frames. Mosaicking was also accomplished using OrthoPro software. Image blocks were processed using two distinct tonal matching functions. Each image was processed to remove any hotspots in the middle of the frame. During the collection of aerial imagery, more light enters the lens from directly below the camera than does from the corners of the frame. Even though filters are designed to minimize this effect, some hotspots still can occur. Additionally, all of the frames underwent a histogram comparison process and then were matched to provide a seamless tone image. Manual seamlines are drawn to avoid feature cuts. During the mosaicking process, seamlines were feathered to provide a smooth transition from one image to another. Photo Science utilized a combined automated / manual methodology for maximum cost efficiency and image quality. Tonal matching was accomplished by comparing pixel values in the overlap area of all images. The software modified the histograms of the individual images to achieve an overall mosaic, which will had a uniform tone throughout the images.

Process_Date: 2012

Process_Step:

Process_Description:

Data contributed to RIGIS by the Rhode Island Eelgrass Mapping Task Force. Metadata reviewed, minor corrections and updates made to formatting and content, RIGIS distribution information added. JPEG2000 format files exported from source GeoTIFF files using Global Mapper 11 at a compression ratio of approximately 1:10 (compress ratio for each image determined individually on an automated basis by the software).

Process_Date: 201210

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: University of Rhode Island Environmental Data Center

Contact_Person: Greg Bonynge

Contact_Address:

Address_Type: mailing and physical

Address: 1 Greenhouse Road

City: Kingston

State_or_Province: RI

Postal_Code: 02881

Contact_Voice_Telephone: 401-874-2180

Contact_Electronic_Mail_Address: greg@edc.uri.edu

Contact_Instructions: email preferred

Cloud_Cover: 0

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: State Plane Coordinate System 1983

State_Plane_Coordinate_System:

SPCS_Zone_Identifier: 3800

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.99999375

Longitude_of_Central_Meridian: -71.50000000

Latitude_of_Projection_Origin: 41.08333333

False_Easting: 328083.33333333

False_Northing: 0.00000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: Row and column

Coordinate_Representation:

Abscissa_Resolution: 1.64042

Ordinate_Resolution: 1.64042

Planar_Distance_Units: Feet

Geodetic_Model:

Horizontal_Datum_Name: North American Datum 1983

Ellipsoid_Name: GRS80

Semi-major_Axis: 6378206.4

Denominator_of_Flattening_Ratio: 294.98

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: University of Rhode Island Environmental Data Center

Contact_Person: Erica Tefft

Contact_Address:

Address_Type: mailing and physical

Address: 1 Greenhouse Road

City: Kingston

State_or_Province: RI

Postal_Code: 02881

Contact_Voice_Telephone: 401-874-5054

Contact_Electronic_Mail_Address: erica@edc.uri.edu

Contact_Instructions: email preferred

Distribution_Liability:

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.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: Esri shapefile

File_Decompression_Technique: ZIP

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://www.rigis.org>

Fees:

No fee for downloading directly from the RIGIS Data Distribution System located at <http://www.rigis.org>.

Metadata_Reference_Information:

Metadata_Date: 20120830

Metadata_Review_Date: 20150911

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Photo Science, Inc.

Contact_Address:

Address_Type: mailing and physical

Address: 523 Wellington Way

Address: Suite 325

City: Lexington

State_or_Province: KY

Postal_Code: 40503

Country: USA

Contact_Voice_Telephone: 859-277-8700

Contact_Electronic_Mail_Address: rebowe@photoscience.com

Hours_of_Service: Monday to Friday, 8 a.m. to 5 p.m., Eastern.

Metadata_Standard_Name: FGDC CSDGM

Metadata_Standard_Version: FGDC-STD-001-1998