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Short Citation:
Office for Coastal Management, 2023: 2013 Coastal Georgia 4-Band 8 Bit Imagery, https://www.fisheries.noaa.gov/inport/item/48425.

Item Identification

Title: 2013 Coastal Georgia 4-Band 8 Bit Imagery
Short Name: coastal_GA_2012
Status: Completed
Publication Date: 2014-03-03
Abstract:

This data set consists of half-foot pixel resolution, natural color orthoimages covering the urban area footprint. An orthoimage is remotely sensed image data in which displacement of features in the image caused by terrain relief and sensor orientation have been mathematically removed. Orthoimagery combines the image characteristics of a photograph with the geometric qualities of a map. Each orthoimage provides imagery over a 5000-foot by 5000-foot block on the ground. There is no image overlap between adjacent files. The projected coordinate system is Georgia State Plane East (FIPS 1001) feet with a NAD83 datum.

Purpose:

This data depicts geographic features on the surface of the earth. It was created to provide easily accessible geospatial data which is readily available to enhance the capability of Federal, State, and local emergency responders, as well as storm water management and assessment.

Notes:

11384

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > INFRARED IMAGERY
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > SPECTRAL/ENGINEERING > VISIBLE WAVELENGTHS > VISIBLE IMAGERY
UNCONTROLLED
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
ISO 19115 Topic Category imageryBaseMapsEarthCover
None 3 inch orthoimage
None image map
None natural color orthophoto
None orthoimage
None orthophoto
None rectified image
None rectified photograph

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > GEORGIA
UNCONTROLLED
None Bryan County
None Chatham County
None Effingham County
None Glynn County
None Liberty County
None Long County
None McIntosh County
None Wayne County

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: Unknown
Data Presentation Form: Image (digital)
Entity Attribute Overview:

Natural color orthoimagery is organized in three color bands or channels which represent the red, green, and blue (RGB) portions of the spectrum. Each image pixel is assigned a triplet of numeric values, one for each color band. Numeric values range from 0 to 255. Areas where data is incomplete due to lack of full coverage (all outside of the AOI) are represented with the numeric value of 0.

Entity Attribute Detail Citation:

U.S. Department of the Interior, U.S. Geological Survey, 1996, Standards for Digital Orthophotos: Reston, VA.

Distribution Liability:

Photo Science, Inc. prepared the original data as set forth in the Scope of Services, in accordance with reasonable care and due diligence as set forth in this Agreement, however, due to the easily alterable nature of electronic media, files, documents, and other deliverables, Woolpert, Inc. makes no warranties, either expressed or implied, with respect to the accuracy, completeness, merchantability, or fitness for any particular purpose, including, but not limited to, use of any/all data as described within this metadata file, by any user of this data. Any use will be at the end-user's sole risk.

Data Set Credit: Photo Science, Inc. A Quantum Spatial Company flew and processed the data.

Support Roles

Data Steward

CC ID: 634392
Date Effective From: 2014-03-03
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: 634394
Date Effective From: 2014-03-03
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: 634395
Date Effective From: 2014-03-03
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: 634393
Date Effective From: 2014-03-03
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: 634398
W° Bound: -81.881
E° Bound: -80.8311
N° Bound: 32.6095
S° Bound: 31.0013

Extent Group 1 / Time Frame 1

CC ID: 634397
Time Frame Type: Range
Start: 2012-11-24
End: 2013-01-24

Spatial Information

Spatial Representation

Representations Used

Grid: Yes

Access Information

Security Class: Unclassified
Data Access Procedure:

https://coast.noaa.gov/dataviewer. This data set is dynamically generated based on user-specified parameters.;

Data Access Constraints:

None

Data 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 it's limitations.

Metadata Access Constraints:

None

Metadata Use Constraints:

None

Distribution Information

Distribution 1

CC ID: 745667
Download URL: https://coast.noaa.gov/dataviewer/#/imagery/search/where:ID=2622
Distributor:
File Name: Customized Download
Description:

Create custom data files by choosing area, map projection, file format, etc.

Distribution 2

CC ID: 745668
Download URL: https://coast.noaa.gov/htdata/raster2/imagery/CoastalGA_2012_2622
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 745670
URL: https://coast.noaa.gov/dataregistry
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 634421
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 634420
Activity Date/Time: 2017-11-14
Description:

Converted from FGDC Content Standard 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: 717636
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 745669
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Technical Environment

Description:

ArcGIS 10.1; Microsoft Windows 7; Microsoft Office; Intergraph's suite of photogrammetric products including Z/I Inflight and GeoMedia OrthoPro

Data Quality

Accuracy:

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.

Horizontal Positional Accuracy:

Fifty of the sixty five Ground Control Points were measured in Accuracy Analyst (fifteen were obscured, out of bounds or had ambiguous locations) in order to produce an accuracy report.; Quantitative Value: 0.976 meters, Test that produced the value: RMSE of the dataset in feet.

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. Source imagery is cloud free. Photography was flown during leaf-off in deciduous vegetation regions. Coastal areas and international boundary regions may have areas without images (void areas) in parts of the coverage. These void areas have a radiometric value of either zero (black) or 128 (uniform gray).

Conceptual Consistency:

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 not corrected unless the overall displacement exceeds one meter.

Lineage

Sources

Aerotriangulation

CC ID: 634380
Contact Name: Photo Science, Inc.
Extent Type: Range
Extent Start Date/Time: 2012-11-24
Extent End Date/Time: 2013-02-03
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. | Source Geospatial Form: model | Type of Source Media: CD-ROM

Georeferenced Single Frames

CC ID: 634379
Contact Name: Photo Science, Inc.
Extent Type: Discrete
Extent Start Date/Time: 2012-11-24
Source Contribution:

Aerial imagery was acquired using a Zeiss/Intergraph Digital Frame camera (DMC) with a flight design that included a total of 4051 exposures in 64 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 2400' above mean terrain. | Source Geospatial Form: remote-sensing image | Type of Source Media: external hard drive

GPS Photo Control Survey for Coastal Georgia

CC ID: 634378
Contact Name: Photo Science, Inc.
Publish Date: 2013-01-01
Extent Type: Discrete
Extent Start Date/Time: 2013
Source Contribution:

Photo Science performed a geodetic control survey in support of a digital orthophoto production project covering the AOI. The survey was done using the Global Positioning System (GPS). A combination of 65 photo identifiable objects and pre-flight targeting was used to provide ground based photo control. Photo control points have a combined local and network accuracy at 95% confidence of less than or equal to five (5) centimeters horizontally and vertically as determined by the residuals of the network adjustment. | Source Geospatial Form: model | Type of Source Media: CD-ROM

LiDAR DEM/DTM

CC ID: 634381
Contact Name: Photo Science, Inc.
Extent Type: Discrete
Extent Start Date/Time: 2013
Source Contribution:

A compilation of topographic land form elevation datasets developed through photogrammetric data capture or through the use of existing elevation datasets from various sources for use in developing digital ortho imagery. | Source Geospatial Form: model | Type of Source Media: DVD

Process Steps

Process Step 1

CC ID: 634382
Description:

Digital aerial imagery was obtained using a large format Z/I Digital Mapping Camera system (DMC) equipped with Airborne GPS/IMU covering the AOI. A total of 169 flight lines with 13859 frames were collected in early 2013 in multi-spectral (RGB and NIR) 16 bits per band format. The imagery was acquired with a 4.7244" (120 m/m) focal length at an altitude above mean terrain of 4800' to yield a raw pixel resolution of 6" suitable for photogrammetric mapping and orthophoto production. The imagery was collected during leaf off conditions in early 2013 under conditions free from clouds and cloud shadows, smoke, fog, haze, light streaks, snow, ice on water bodies, foliage, flooding, and excessive soil moisture. The sun angle threshold was 30 degrees. The imagery consisted of panchromatic, blue, green, red and near infrared bands. The three color bands and near infrared bands have been pan sharpened and archived as frame imagery.

Process Date/Time: 2013-01-01 00:00:00

Process Step 2

CC ID: 634383
Description:

A total of 65 ground based photo control points were established throughout the area of interest 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. This control supplemented the exposure station control obtained from the onboard Airborne Global Positioning System (ABGPS) and Inertial Measurement Unit (IMU). Photo control points established for this project have a combined local and network accuracy at 95% confidence of less than or equal to five (5) centimeters horizontally and vertically as determined by the residuals of the network adjustment.

Process Date/Time: 2013-01-01 00:00:00

Process Step 3

CC ID: 634384
Description:

This process involved the development of seamless topographic landform elevation dataset utilizing a combination of existing public domain elevation data sets existing public domain elevation data sets as well as the stereo compilation of new elevation data from the 2013 stereo imagery using autocorrelation techniques. All elevation data used was capable of supporting 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 DTM is suitable for orthophoto production only (not suitable for contour generation). The DTM is used to then generate a Triangulated Irregular Network (TIN) to support orthophoto production.

Process Date/Time: 2013-01-01 00:00:00
Source: LiDAR DEM/DTM

Process Step 4

CC ID: 634385
Description:

Utilizing all four pan-sharpened bands [blue (B), green (G), red(R) and near infrared (IR)] digital orthorectification was performed using cubic convolution algorithms resulting in a spatial and radiometric transformation of the digital image from line/sample space into State Plane Zone 1002 Georgia West. The interior and exterior orientation parameters 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 tonally balanced to produce a uniform contrast and tone across the entire project. The individual overlapping orthophoto frames were mosaicked together and the final tiles were extracted from the image set to a 5,000 x 5,000 foot tiling scheme consisting of 3,346 individual ortho tiles. Delivery included digital ortho photos at a 6" pixel ground sample distance in 8 bit, 4 band (RGB and NIR) uncompressed GeoTIFF and MrSID files. The ortho photos meet a horizontal accuracy of +/- 2.5-feet or less at 95% confidence level when compared to higher accuracy check points based on NSSDA testing standards.

Process Date/Time: 2013-01-01 00:00:00
Source: Aerotriangulation

Catalog Details

Catalog Item ID: 48425
GUID: gov.noaa.nmfs.inport:48425
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-14 14:46+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2018-03-13
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2018-03-13
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2019-03-13