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Short Citation:
OCM Partners, 2022: Georgetown County South Carolina Orthophotography, 17SPS225840, https://www.fisheries.noaa.gov/inport/item/49489.

Item Identification

Title: Georgetown County South Carolina Orthophotography, 17SPS225840
Short Name: 2010_usgs_georgetown
Status: Completed
Publication Date: 2011-05-26
Abstract:

Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary digital orthophoto is a 30cm GSD resolution with tiles measuring 1500 x 1500 meters cast on the Universal Transverse Mercator Zone 17N on the North American Datum of 1983 (NAD83/2007). The aerial photography used to create the digital images was acquired between January 31st, and February 8th, 2010.

Purpose:

The orthophotography was created for use by the USGS, and Georgetown County South Carolina.

Notes:

11935

Keywords

Theme Keywords

Thesaurus Keyword
UNCONTROLLED
ISO 19115 Topic Category imageryBaseMapsEarthCover
None 3 band orthophoto
None image map
None orthoimage
None orthophoto
None rectified image
None rectified photograph
None Remotely Sensed Imagery/Photography

Spatial Keywords

Thesaurus Keyword
UNCONTROLLED
U.S. Department of Commerce, 1987, Codes for the Identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard (FIPS) 5-2): Washington, D.C., National SC
U.S. Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions (Federal Information Processing Standard (FIPS) 10-4): Washington, D.C., National Institute of Standards and Techno US
None South Carolina

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: remote sensing image
Distribution Liability:

Users must assume responsibility to determine the usability of these data. These photographs were obtained for use by NGS during the course of its development of potential final products to fulfill its statutory mission. Although NGS is making these photographs available to others who may find the photographs of value, NGS does not warrant, endorse, or recommend the use of these photographs for any given purpose. NGS is providing these photographs "as is," and NGS disclaims any and all warranties, whether expressed or implied, including (without limitation) any implied warranties of merchantability or fitness for a particular purpose. In no event will NGS be liable to you or any third party for any direct, indirect, incidental, consequential, special, or exemplary damages or lost profits resulting from any use or misuse of these data.

Data Set Credit: Fugro Earthdata, Inc.

Support Roles

Data Steward

CC ID: 665452
Date Effective From: 2011-05-26
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: 665454
Date Effective From: 2011-05-26
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: 665455
Date Effective From: 2011-05-26
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: 665453
Date Effective From: 2011-05-26
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: 665458
W° Bound: -79.6855
E° Bound: -79.0783
N° Bound: 33.7855
S° Bound: 33.1119

Extent Group 1 / Time Frame 1

CC ID: 665457
Time Frame Type: Discrete
Start: 2010

Access Information

Security Class: Unclassified
Data Access Constraints:

All orthophotography is the property of the USGS and Georgetown County

Data Use Constraints:

Orthophotography is the property of the USGS, and Georgetown County, SC. Orthophotography is the intellectual property of the USGS, and Georgetown County, SC.

Distribution Information

Distribution 1

CC ID: 739894
Download URL: https://coast.noaa.gov/dataviewer/#/imagery/search/where:ID=444
Distributor:
File Name: Customized Download
Description:

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

Distribution 2

CC ID: 665459
Download URL: https://coast.noaa.gov/digitalcoast
Distributor:
Description:

Downloadable Data

File Type: GeoTIFF

Distribution 3

CC ID: 739895
Download URL: https://coast.noaa.gov/htdata/raster2/imagery/GeorgetownSC_2010_444
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 739897
URL: https://coast.noaa.gov/digitalcoast
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 665472
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 665471
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: 718037
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 739896
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Technical Environment

Description:

The following software is used for validation of the imagery and surface modeling 1. Aerotriangulation - Pixel Factory 2. Digital Orthophotography - Pixel Factory 3. Bentley - MicroStation 4. Pixel Factory 5. ZI - OrthoPro 6. ESRI - ArcInfo 7. ERDAS Imagine 8. TerraScan 9. Earthdata Proprietary software 10. Adobe - Photoshop 11. GPro

Data Quality

Accuracy:

The orthophotos were created to be fully compliant with a horizontal positional accuracy shall not exceed 5.19 meters tested to NSSDA Standards (95% confidence). Error XY will not exceed 1.49 m RMSE X or Y.

Horizontal Positional Accuracy:

The orthophotos were created to be fully compliant with a horizontal positional accuracy shall not exceed 5.19 meters tested to NSSDA Standards (95% confidence). Error XY will not exceed 1.49 m RMSE X or Y.

Completeness Report:

The following methods are used to assure imagery accuracy. 1. Use of IMU (inertial measurement unit) and ground control network utilizing GPS techniques. 2. Use of airborne GPS (global positioning system) inconjunction with the acquisition of imagery. The following software is used for validation of the imagery and surface modeling. 1. Aerotriangulation - Pixel Factory 2. DSM and DEM data - Pixel Factory 3. Digital Orthophotography - Pixel Factory and Photoshop. 4. Bentley - MicroStation 5. Pixel Factory 6. ESRI - ArcGIS 7. Earthdata proprietary software 8. Adobe - Photoshop

Conceptual Consistency:

Compliance with the accuracy standard was ensured by the collection of photo identifiable GPS ground control after the acquisition of aerial imagery. The following checks were performed. 1. The ground control and airborne GPS data stream were validated through a fully analytical bundle aerotriangulation adjustment. The RMSE is less than 1, 10,000th of the flying height. 2. The DSM (DEM) and lidar data were checked against the project control. The technician visited and confirmed the accuracy of the points during initial processing. 3. Digital orthophotography was validated through an inspection of edge matching and visual inspection for image quality.

Lineage

Sources

Digital Surface Model for Georgetown County

CC ID: 665443
Contact Name: Georgetown County South Carolina, U.S. Geological Survey (USGS), and Fugro Earthdata, Inc.
Publish Date: 2010-01-01
Extent Type: Discrete
Extent Start Date/Time: 2009
Source Contribution:

In 2009 the county of Georgetown tasked Fugro EarthData in 2009 to fly and produce orthophotography. For that project a DSM was generated from Fugro EarthData's Pixel Factory processing software. The Pixel Factory digital surface modeling is based on an auto correlated pixel-matching system within the Pixel Factory software. The auto correlated digital surface model (DSM) surface represents the initial surface model. The following is the process used. 1. Using the DSM Pixel Factory data set created, the technician performed a visual inspection of the data to verify that the flight lines met correctly. The technician also verified that there were no voids, and that the data covered the project limits. The technician then selected a series of areas from the dataset and inspected them where adjacent flight lines met. 2. This DSM surface is used in the rectification of the orthoimagery. | Type of Source Media: external hard drive

Ground Control

CC ID: 665445
Contact Name: TerraSurv
Publish Date: 2010-01-01
Extent Type: Range
Extent Start Date/Time: 2010-02-01
Extent End Date/Time: 2010-02-15
Source Contribution:

TerraSurv was contracted by the Fugro EarthData to acquire 36 ground control points during the acquisition of aerial imagery. The ground control points were established using GPS for vertical and horizontal coordinate values. NAD83(NSRS2007)South Carolina Stateplane NAVD 88 International Feet. | Type of Source Media: external hard drive

Lidar Surface

CC ID: 665444
Contact Name: South Carolina LiDAR Consortium
Publish Date: 2009-01-01
Extent Type: Discrete
Extent Start Date/Time: 2008
Source Contribution:

In 2008 Fugro EarthData flew lidar data over Marion and Dillon counties South Carolina for the South Carolina LiDAR Consortium. The data produced from that project was utilized as the surface for orthorectification. | Type of Source Media: external hard drive

South Carolina raw ADS40-52 data

CC ID: 665442
Contact Name: Georgetown County South Carolina, U.S. Geological Survey (USGS), and Fugro Earthdata, Inc.
Publish Date: 2010-01-01
Extent Type: Discrete
Extent Start Date/Time: 2010
Scale Denominator: 1200
Source Contribution:

The aerial imagery acquisition for Georgetown, Marion, and Dillon Counties was flown to support the creation of digital orthophotography with a 30cm pixel. The imagery was acquired on January 31st, and February 3rd, 7th, and 8th, 2010. There were four sorties and 50 flight lines. All imagery was collected using the Leica ADS40-52 digital pushbroom sensor. | Type of Source Media: not made available

Process Steps

Process Step 1

CC ID: 665446
Description:

The digital orthophotography is comprised of a 24 bit, natural color RGB bands, 30cm pixel resolution ground orthos for the 3 counties of the project. The Pixel Factory process was used in the generation of the orthoimagery covering all project tiles. The initial radiometric adjustments were performed on the imagery for each flight line attempting to reach the best possible histogram. The rectification process was then run using the processed DSM and the lidar surfaces and the radiometrically balanced imagery on each flight line. The quicklook (reduced resolution rectification) of each flight line exported out of Pixel Factory. A second set of radiometric adjustments were made using Earthdata proprietary tools. The radiometrically balanced imagery was then re-imported into the Pixel Factory system and the histogram from the quicklook was applied to the full resolution imagery. Mosaic lines were placed, joining the ADS40 imagery strips. In initial QA/QC was performed by the technician to ensure that the mosaic lines were appropriately placed and that there was appropriate imagery coverage. The final imagery data set is removed from the Pixel Factory environment in a process called "packaging" where the individual tiles are created. All data processing in the Pixel Factory system is performed in UTM Zone 17N meters; it is during packaging that final datum and projection are defined. The created tiles are reviewed again for anomalies and interactive radiometric adjustment applied where needed. QA/QC was performed looking for anomalies, smears and other indications of problems within the digital orthophoto creation process, interactive radiometric adjustment applied where needed. Two additional radiometric adjustments are applied to the completed orthos in Adobe Photoshop. The first is a sharpening mask filter; this filter is used to help increase sharpness of a digital image. The basis for this filter is to locate pixels that differ in value from surrounding pixels by the threshold specified. It then increases the pixels contrast by the value identified. For neighboring pixels specified by the threshold, the lighter pixels get even lighter and the darker pixels get even darker based on the specified amount. The changes made maintained the integrity of the original histogram curve. The final digital ortho product was GEOTIFF files. All data was delivered on external hard drives.

Process Date/Time: 2010-05-01 00:00:00

Catalog Details

Catalog Item ID: 49489
GUID: gov.noaa.nmfs.inport:49489
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:15+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: OCMP
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