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Short Citation:
Office for Coastal Management, 2023: 2016 Walton County, Georgia ADS100 4-Band 8 Bit Imagery, https://www.fisheries.noaa.gov/inport/item/48413.

Item Identification

Title: 2016 Walton County, Georgia ADS100 4-Band 8 Bit Imagery
Short Name: 2016_walton_ga
Status: Completed
Publication Date: 2016-09-16
Abstract:

This data set consists of 0.5-foot pixel resolution, natural color orthoimages covering Walton County, Georgia. 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 2,500-foot by 2,500-foot block on the ground. There is no image overlap between adjacent files. The projected coordinate system is Georgia State Plane West (FIPS 1002) feet with a NAD83 datum.

A secondary set of GeoTIFF tiles, MrSID tiles, and MrSID mosaic was produced in WGS84 Lat/Long.

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:

11368

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 0.5 foot orthoimage
None 6 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
U.S. Department of Commerce GA
U.S. Department of Commerce US
None Georgia
None Walton 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 four color bands or channels which represent the red, green, blue, and near-infrared (RGB-IR) portions of the spectrum. Each image pixel is assigned a quadruplet of numeric values, one for each color band. Numeric values range from 0 to 255.

Entity Attribute Detail Citation:

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

Distribution Liability:

Users must assume responsibility to determine the appropriate use of these data. DATA SHOULD NOT BE USED FOR LEGALLY BINDING APPLICATIONS.

Data Set Credit: Quantum Spatial, Inc. flew and processed the data.

Support Roles

Data Steward

CC ID: 633788
Date Effective From: 2016-09-16
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: 633790
Date Effective From: 2016-09-16
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: 633791
Date Effective From: 2016-09-16
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: 633789
Date Effective From: 2016-09-16
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: 633794
W° Bound: -83.99086636987
E° Bound: -83.50512801377
N° Bound: 33.93060762753
S° Bound: 33.59347276876

Extent Group 1 / Time Frame 1

CC ID: 633793
Time Frame Type: Range
Start: 2016-02-05
End: 2016-02-18

Spatial Information

Spatial Representation

Representations Used

Grid: Yes

Grid Representation 1

CC ID: 633780
Dimension Count: 2
Cell Geometry: Point
Transformation Parameters Available?: No

Axis Dimension 1

Dimension Type: Row
Size: 1250

Axis Dimension 2

Dimension Type: Column
Size: 1250

Access Information

Security Class: Unclassified
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 its limitations.

Distribution Information

Distribution 1

CC ID: 633795
Download URL: https://coast.noaa.gov/dataregistry/
Distributor:
Description:

Downloadable Data

File Type: Erdas Imagine (.img) and TIFF / BigTIFF / GeoTIFF (.tif)

Distribution 2

CC ID: 744460
Download URL: https://coast.noaa.gov/dataviewer/#/imagery/search/where:ID=5159
Distributor:
File Name: Customized Download
Description:

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

Distribution 3

CC ID: 744459
Download URL: https://coast.noaa.gov/htdata/raster1/imagery/WaltonGA_2016_5159
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 744462
URL: https://coast.noaa.gov/dataregistry
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 633815
Activity Date/Time: 2017-02-22
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 633814
Activity Date/Time: 2017-11-14
Description:

Converted from FGDC CSDGM (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 717185
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 744461
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Technical Environment

Description:

ArcGIS 10.3; Microsoft Windows 10; Microsoft Office; Intergraph's suite of photogrammetric products including 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:

Please see the Accuracy Analyst report for a detailed report showing the 18 control points measured to produce the NSSDA value of 0.685 feet. This meets the required value of +/- 2.5 feet.

; Quantitative Value: 0.685 meters, Test that produced the value: NSSDA 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.

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: 633773
Contact Name: Quantum Spatial, Inc.
Extent Type: Discrete
Extent Start Date/Time: 2016
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: online

Georeferenced Single Frames

CC ID: 633772
Contact Name: Quantum Spatial, Inc.
Publish Date: 2016-01-01
Extent Type: Range
Extent Start Date/Time: 2016-02-05
Extent End Date/Time: 2016-02-18
Source Contribution:

Aerial imagery was acquired using a Leica ADS 100 camera with a flight design that included a total of 64 flight lines for the entire project area. 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 5,965' above mean terrain for 0.5-foot imagery.

| Source Geospatial Form: remote-sensing image | Type of Source Media: external hard drive

GPS Photo Control Survey for Georgia Counties: Morgan, Oconee, Newton, and Walton

CC ID: 633771
Contact Name: Quantum Spatial, Inc.
Publish Date: 2016-01-01
Extent Type: Discrete
Extent Start Date/Time: 2016
Source Contribution:

Quantum Spatial 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 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

CC ID: 633774
Contact Name: Walton County, GA
Source Contribution:

A compilation of topographic land form elevation datasets developed through the use of existing elevation datasets from various sources for use in developing digital ortho imagery. The surfaces were created from LiDAR data collected from previous projects.

| Source Geospatial Form: model | Type of Source Media: online

Process Steps

Process Step 1

CC ID: 633775
Description:

Digital aerial imagery was obtained using a large format Leica ADS 100 camera system equipped with Airborne GPS/IMU covering the AOI. A total of 64 lines were collected in early 2016 in multi-spectral (RGB and NIR) 16 bits per band format. The imagery was acquired with a 62.5 mm focal length at an altitude above mean terrain of 5,965' to yield a pixel resolution of 0.5-feet suitable for photogrammetric mapping and orthophoto production. The imagery was collected during leaf off conditions in early 2016 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 blue, green, red, and near infrared bands.

Process Date/Time: 2016-01-01 00:00:00

Process Step 2

CC ID: 633776
Description:

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: 2016-01-01 00:00:00

Process Step 3

CC ID: 633777
Description:

Utilizing all four bands [blue (B), green (G), red(R) and near 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 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 2,500 x 2,500 foot tiling scheme consisting of 1,481 individual ortho tiles. Delivery included digital ortho photos at a 0.5-foot pixel ground sample distance in 8 bit, 4 band (RGB and NIR) uncompressed GeoTIFF and MrSID Gen 3 (compression 40:1) 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: 2016-01-01 00:00:00

Process Step 4

CC ID: 633778
Description:

A single mosaic of the 4-band orthoimagery was produced using LizardTech GeoExpress software version 9.1. Mosaics were produced in MrSID Generation 3 format at a compression ratio of 40:1.

Process Date/Time: 2016-01-01 00:00:00

Catalog Details

Catalog Item ID: 48413
GUID: gov.noaa.nmfs.inport:48413
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