Rhode Island Eelgrass Mapping Task Force - 2016 Orthophotography Project

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator:
Rhode Island Eelgrass Mapping Task Force, United States Geological Survey (USGS)
Publication_Date: 20161214
Title:
Rhode Island Eelgrass Mapping Task Force - 2016 Orthophotography Project
Edition: 2016
Geospatial_Data_Presentation_Form: remote-sensing image
Publication_Information:
Publication_Place: Kingston, RI
Publisher:
University of Rhode Island Environmental Data Center, Rhode Island Eelgrass Mapping Taskforce
Other_Citation_Details:
Suggested bibliographic reference: RIGIS, 2016. Rhode Island Eelgrass Mapping Task Force - 2016 Orthophotography Project. 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: 14 December 2016).
Online_Linkage: <http://www.rigis.org>
Larger_Work_Citation:
Citation_Information:
Originator: Rhode Island Geographic Information System (RIGIS)
Publication_Date: 1993
Title:
Rhode Island Geographic Information System (RIGIS) Data Distribution System
Online_Linkage: <http://www.rigis.org>
Description:
Abstract:
The Rhode Island Eelgrass Mapping Task Force orthoimagery consists of 0.5-meter, 4-band true color orthoimages covering approximately 424 square miles of intertidal and sub tidal habitats in Rhode Island. The original digital orthomosaic consisted of uncompressed ortho photo tiles formatted as 16-bit, 4-band (RGB-IR), uncompressed, GeoTIFF images with TIF world files; these were reprocessed by the URI EDC for inclusion on RIGIS. A DMC I large format digital camera was used to capture four band (RGB-IR) imagery at 12 bits. The source imagery was captured during late Spring of 2016 on June 15, 2016 and June 26, 2016. 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.
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.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20160615
Ending_Date: 20160626
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -72.0041773779839
East_Bounding_Coordinate: -70.9967862252309
North_Bounding_Coordinate: 41.9397849851562
South_Bounding_Coordinate: 41.0600817085689
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: aerial
Theme_Keyword: photograph
Theme_Keyword: shoreline
Theme_Keyword: coastal
Theme_Keyword: digital orthophotography
Theme_Keyword: rectified image
Theme_Keyword: orthophoto
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Rhode Island
Place_Keyword: RI
Place_Keyword: Coastal Zone
Place_Keyword: Block Island
Place_Keyword: Narragansett Bay
Access_Constraints: None
Use_Constraints:
None. However, users should be aware that temporal changes may have occurred since this data set was collected and that some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations. Acknowledgment of the U.S. Geological Survey would be appreciated for products derived from 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.rigis.org/logos>.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: University of Rhode Island Environmental Data Center
Contact_Person: Mike Bradley
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: mike@edc.uri.edu
Contact_Instructions: email preferred
Data_Set_Credit:
This data set was developed for the Rhode Island Eelgrass Mapping Task Force by the United States Geological Survey (USGS) and Quantum Spatial, Inc.
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Radiometry is verified by visual inspection of the digital orthophoto. Slight systematic radiometric differences may exist between adjacent orthoimage files; these are due primarily to differences in source image capture dates and sun angles along flight lines. These differences can be observed in an image's general lightness or darkness when it is compared to adjacent orthoimage file coverages. Tonal balancing may be performed over a group of images during the mosaicking process which may serve to lighten or darken adjacent images for better color tone matching.
Logical_Consistency_Report:
All GeoTIFF tagged data and image file sizes are validated using commercial GIS software to ensure proper loading before being archived. This validation procedure ensures correct physical format and field values for tagged elements. Seamlines and tile edges are visually inspected. Seamline mismatches are corrected unless the overall displacement is less than one pixel.
Completeness_Report:
Orthoimages are visually inspected for completeness to ensure that no gaps or image misplacements exist within and between adjacent images. These images are derived by mosaicking multiple images to ensure complete coverage. Void areas along the project boundary of the quarter quads have value of 0,0,0 (black). Source imagery is cloud free.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Please see the Accuracy Analyst report for a detailed report showing the 70 control points measured to produce the NSSDA value of 1.068 meters. This meets the required value of 2.58 meters.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 1.068
Horizontal_Positional_Accuracy_Explanation: NSSDA in meters at the 95% confidence interval.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: There is no vertical component for orthophotos.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Quantum Spatial, Inc.
Publication_Date: 2016
Title: GPS Photo Control Survey
Geospatial_Data_Presentation_Form: vector digital data and tabular data
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2016
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: CONTROL
Source_Contribution:
Quantum Spatial performed a geodetic control survey in support of the digital orthophoto production project. A total of 70 photo identifiable objects and pre-flight targeting was used to provide ground based photo control. Please see the survey report for more information.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Richard Crouse and Associates
Publication_Date: 2016
Title: Georeferenced Single Frames
Geospatial_Data_Presentation_Form: remote-sensing image
Publication_Information:
Publication_Place: Frederick, MD
Publisher: Richard Crouse and Associates
Type_of_Source_Media: external hard drive
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20160615
Ending_Date: 20160626
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: PHOTO
Source_Contribution:
Aerial imagery was acquired using DMC I large format cameras with a flight design that included a total of 13 exposures in 280 flight lines. Aerial imagery was supplemented with the simultaneous acquisition of airborne GPS/IMU data, which captured the ground coordinate for the nadir point of each photograph. Aerial imagery was exposed at an altitude of 16,000 feet above mean terrain.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Quantum Spatial
Publication_Date: 2016
Title: Aerotriangulation
Geospatial_Data_Presentation_Form: model
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2016
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: AT
Source_Contribution:
Softcopy aerotriangulation was performed utilizing the airborne GPS/IMU data, GPS ground control and image coordinate measurements allowing the direct computation of the exterior orientation parameters for each image of the project. Maximum, minimum, and mean baseline lengths are as follows: For Jun 15, 2016-A (N3520X, SN131), CORS Station NPRI, the max length was 33.7 km, min length was 10.1 km, and mean length was 21.9 km. For Jun 26, 2016-A (N3520X, SN131), CORS Station NPRI, the max length was 56.8 km, min length was 0.06 km, and mean length was 28.7 km km.
Source_Information:
Source_Citation:
Citation_Information:
Originator: USGS
Publication_Date: 2012
Title: DEM
Geospatial_Data_Presentation_Form: raster digital data
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2012
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: DEM
Source_Contribution:
A compilation of topographic land form elevation datasets developed through photogrammetric data capture and/or LiDAR provided from various sources for use in developing digital ortho imagery.
Process_Step:
Process_Description:
Digital aerial imagery was obtained using a large format Z/I DMC I equipped with Airborne GPS/IMU. A total of 13 flight lines with 280 frames were collected in the spring of 2016 in multi-spectral (RGB-IR) 12-bit format. The 0.5-meter imagery was acquired at an altitude above mean terrain of 16,000 feet to yield a pixel resolution suitable for photogrammetric mapping and orthophoto production. The imagery was collected under conditions free from clouds and cloud shadows, smoke, fog, haze, light streaks, snow, ice on water bodies, flooding, excessive soil moisture, and foliage. Imagery was collected during low tide windows, during low turbidity conditions, and little to no surface wind or waves. In order to minimize shadow conditions, imagery was obtained during the period of the day when the sun angle was between 20 and 60 degrees. The imagery consisted of blue, green, red, and infrared bands. Imagery for the photogrammetric mapping and digital orthophotos was captured according to the USGS Contract No. G16PC00016, Task Order Number: G16PD00548 regarding, snow, haze and cloud cover, and modified as appropriate to accommodate the requirements specific to DMC I technologies and as specified in this scope of work.
Source_Used_Citation_Abbreviation: RAWs
Process_Date: 2016
Source_Produced_Citation_Abbreviation: Georefs
Process_Step:
Process_Description:
A total of 70 ground based photo control points were established throughout the project area using a combination of conventional and GPS survey methods in order to support softcopy aerotriangulation and photogrammetric mapping meeting the accuracies specified in this Scope of Work. Ground control collection followed requirements set forth in USGS Contract No. G16PC00016, Task Order Number: G16PD00548, and were modified as appropriate to accommodate the specifications related to ABGPS collection specific to these end photogrammetric mapping requirements. Please see the survey report for more information.
Source_Used_Citation_Abbreviation: Geodetic control
Process_Date: 2016
Source_Produced_Citation_Abbreviation: Control
Process_Step:
Process_Description:
Softcopy aerotriangulation was performed on 2 large blocks of imagery. The airborne GPS/IMU data, GPS ground control, and image coordinate measurements were utilized to allow the direct computation of the exterior orientation parameters for each image frame to support the photogrammetric process and orthophoto production. The adjusted Root Mean Square Error (RMSE) of all horizontal and vertical control points used for adjustment was 1.0 foot or better. At the same time, residuals on any horizontal or vertical control point did not exceed plus or minus 0.75 feet. The ground survey coordinates were within two times the RMSE (two feet) of the corresponding AT derived coordinates.
Source_Used_Citation_Abbreviation: ABGPS
Source_Used_Citation_Abbreviation: Control
Source_Used_Citation_Abbreviation: RAWs
Process_Date: 2016
Source_Produced_Citation_Abbreviation: AT
Process_Step:
Process_Description:
This process involved the development of seamless topographic landform elevation dataset utilizing the LiDAR data collected for the USGS to support the production of digital orthophotography that meet or exceed required orthophoto horizontal accuracy. The topographic features included a grid of elevation points and may include break lines that define ridges, valleys, edge of water, transportation features and abrupt changes in elevation. The final DEM is suitable for orthophoto production only (not suitable for contour generation). The DEM is used to then generate a Triangulated Irregular Network (TIN) to support orthophoto production.
Source_Used_Citation_Abbreviation: DEM
Source_Used_Citation_Abbreviation: LiDAR
Process_Date: 2016
Source_Produced_Citation_Abbreviation: DEM
Process_Step:
Process_Description:
Utilizing all four bands [blue (B), green (G), red(R), and infrared (IR)] digital orthorectification was performed using bilinear interpolation algorithms resulting in a spatial and radiometric transformation of the digital image from line/sample space into the NAD83 UTM Zone 19, meters. The interior and exterior orientation parameters from the aerotriangulation process were used to project each pixel into the ground coordinate system, while the ortho grade DEM/DTM was used to correct for relief displacement. Radiometric correction software and techniques were used to create orthophoto files that minimize the appearance of image seams and without loss of feature signature. Orthophotos are checked for geometric accuracy, image quality, and are tonally balanced to produce a uniform contrast and tone across the entire project. The individual overlapping orthophoto frames were mosaicked together. The ortho photos meet a horizontal accuracy of 2.58 meters or less at 95% confidence level when compared to higher accuracy check points based on NSSDA testing standards.
Source_Used_Citation_Abbreviation: Georefs
Source_Used_Citation_Abbreviation: AT
Source_Used_Citation_Abbreviation: Control
Source_Used_Citation_Abbreviation: DEM
Process_Date: 2016
Source_Produced_Citation_Abbreviation: Orthos
Process_Step:
Process_Description:
Data contributed to RIGIS by the Rhode Island Eelgrass Mapping Task Force. Using Global Mapper v18, data were projected to Rhode Island State Plane NAD83 feet, then exported to both GeoTIFF and JPEG2000 (target compression ratio 1:10) file formats using a 10,000ft by 10,000ft tiling system. Tile names are based upon the coordinates of the southwest corner of the given tile. Individual tiles overlap their neighbors by approximately 5 pixels, and none of the original image data were clipped away. Original project-level metadata were written by Quantum Spatial Inc.; minor updates to metadata content were made to reflect changes made by the URI EDC and to bring metadata up to the RIGIS metadata standard.
Source_Used_Citation_Abbreviation: Orthos
Process_Date: 20161214
Process_Contact:
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
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: NAD 1983 StatePlane Rhode Island FIPS 3800 Feet
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.99999375
Longitude_of_Central_Meridian: -71.5
Latitude_of_Projection_Origin: 41.08333333333334
False_Easting: 328083.3333333333
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000000007286382608384659
Ordinate_Resolution: 0.000000007286382608384659
Planar_Distance_Units: foot_us
Geodetic_Model:
Horizontal_Datum_Name: D North American 1983
Ellipsoid_Name: GRS 1980
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222101
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.edc.uri.edu/rigis>.
Metadata_Reference_Information:
Metadata_Date: 20160916
Metadata_Review_Date: 20161214
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Quantum Spatial
Contact_Person: Sarah Zibart
Contact_Address:
Address_Type: mailing and physical
Address: 523 Wellington Way
City: Lexington
State_or_Province: KY
Postal_Code: 40503
Country: USA
Contact_Voice_Telephone: 859-277-8700
Contact_Facsimile_Telephone: 859-277-8901
Contact_Electronic_Mail_Address: szibart@quantumspatial.com
Hours_of_Service: Monday through Friday 8:00 AM to 5:00 PM (Eastern Time)
Contact_Instructions:
If unable to reach the contact by telephone, please send an email. You should get a response within 24 hours.
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.9.22 on Thu Dec 15 10:19:33 2016