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Short Citation:
National Geodetic Survey, 2023: 2019 NOAA NGS 4-band Ortho-rectified Mosaic of Chesapeake Bay (Gwynn to Newport News, VA),

Item Identification

Title: 2019 NOAA NGS 4-band Ortho-rectified Mosaic of Chesapeake Bay (Gwynn to Newport News, VA)
Status: Completed
Publication Date: 2021-04-30

This orthoimagery data set includes 0.3 meter 8-bit 4-band (RGB-IR) digital orthoimage tiles in GeoTIFF format. Geographic Extent: 7 counties in Maryland, covering approximately 569 total square miles. Dataset Description: The Chesapeake Bay NOAA Option 3 project called for the planning, acquisition, processing, and derivative products of imagery data to be collected at a ground sample distance (GSD) of 0.3 meter. Project specifications are based on the American Society of Photogrammetry and Remote Sensing (ASPRS) standards. The data were developed based on a horizontal projection/datum of NAD1983 2011 UTM Zone 18N, Meter. Orthoimagery data were delivered in 164 individual 3000 m x 3000 m tiles as 0.3 meter 8-bit 4-band (RGB-IR) orthophoto tiles in GeoTIFF format.

Ground Conditions: Imagery was collected in fall 2018 and spring 2019, while no snow was on the ground and rivers were at or below normal levels. In order to post process the imagery data to meet task order specifications and meet ASPRS horizontal accuracy guidelines, Quantum Spatial, Inc. utilized a total of 3 ground control points to assess the horizontal accuracy of the data.


These data depict geographic features on the surface of the earth. The dataset was created to current imagery data for Maryland.

Supplemental Information:

Project VA1901-TB-Imagery


Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
Global Change Master Directory (GCMD) Science Keywords
ISO 19115 Topic Category
NOS Data Explorer Topic Category Remotely Sensed Imagery/Photography
None aerial
None coastal
None digital orthophotography
None mosaic
None orthophoto
None photograph
None rectified image
None shoreline

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
None Chesapeake Bay
None Maryland

Instrument Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Instrument Keywords

Platform Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Platform Keywords Aircraft > Aircraft

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Imagery
Maintenance Frequency: None Planned
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. Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners

Data Set Credit: This data set was developed by Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS), Remote Sensing Division

Support Roles

Data Steward

CC ID: 1057071
Date Effective From: 2021
Date Effective To:
Contact (Organization): National Geodetic Survey (NGS)
Address: 1315 East-West Hwy
Silver Spring, MD 20910


CC ID: 1057070
Date Effective From: 2021
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Metadata Contact

CC ID: 1057072
Date Effective From: 2021
Date Effective To:
Contact (Organization): National Geodetic Survey (NGS)
Address: 1315 East-West Hwy
Silver Spring, MD 20910

Point of Contact

CC ID: 1057073
Date Effective From: 2021
Date Effective To:
Contact (Organization): National Geodetic Survey (NGS)
Address: 1315 East-West Hwy
Silver Spring, MD 20910
Contact Instructions:



Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1057086
W° Bound: -76.66805555556
E° Bound: -76.20805555556
N° Bound: 37.51472222222
S° Bound: 37.05166666667

Extent Group 1 / Time Frame 1

CC ID: 1057085
Time Frame Type: Discrete
Start: 2019-04-01

Spatial Information

Reference Systems

Reference System 1

CC ID: 1057087

Coordinate Reference System

CRS Type: Projected
EPSG Code: EPSG:6347
EPSG Name: NAD83(2011) / UTM zone 18N
See Full Coordinate Reference System Information

Access Information

Security Class: Unclassified
Data Access Procedure:

Data is available online for custom downloads

Data Access Constraints:


Data Use Constraints:

Users should be aware that temporal changes may have occurred since this data set was collected and 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: 1057074
Start Date: 2021
End Date: Present
Download URL:
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2021 - Present)
File Name: Customized Download

Create custom data files by choosing data area, map projection, file format, etc. A new metadata will be produced to reflect your request using this record as a base.

File Type: Zip
Compression: Zip

Distribution 2

CC ID: 1057075
Start Date: 2021
End Date: Present
Download URL:
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2021 - Present)
File Name: Bulk Download

Bulk download of data files in the original coordinate system.

File Type: GeoTIFF



CC ID: 1057076
Name: NOAA's Office for Coastal Management (OCM) website
URL Type:
Online Resource
File Resource Format: HTML

Information on the NOAA Office for Coastal Management (OCM)


CC ID: 1057077
Name: NOAA's Office for Coastal Management (OCM) Data Access Viewer (DAV)
URL Type:
Online Resource
File Resource Format: HTML

The Data Access Viewer (DAV) allows a user to search for and download elevation, imagery, and land cover data for the coastal U.S. and its territories. The data, hosted by the NOAA Office for Coastal Management, can be customized and requested for free download through a checkout interface. An email provides a link to the customized data, while the original data set is available through a link within the viewer.

Technical Environment


OS Independent

Data Quality

Horizontal Positional Accuracy:

The project specifications require that only horizontal accuracy be computed for orthoimagery files. The required accuracy meets or exceeds ASPRS standards. The horizontal accuracy was tested with 3 checkpoints located throughout the project area. These checkpoints were not used in the calibration or post-processing of the imagery data. The checkpoints were distributed throughout the project area and were surveyed using GPS techniques. See survey report for additional survey methodologies. The x and y positions of where the checkpoints fell on the orthoimagery were collected. These values were then compared to the surveyed control point x and y values

Qualitative value: Tested 0.154 meters RMSEx. The RMSEx of the imagery was calculated using 3 checkpoints. Tested 0.195 meters RMSEy. The RMSEy of the imagery was calculated using 3 checkpoints. Tested 0.249 meters RMSEr. The RMSEr of the imagery was calculated using 3 checkpoints.

Completeness Measure:

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.

Completeness Report:

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

Conceptual Consistency:

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


Lineage Statement:

Aerial imagery was acquired using a UltraCam Eagle camera with a flight design that included a total of 10 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 13100 feet above mean terrain. 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. A compilation of topographic land form elevation datasets developed using in-house LiDAR data and data from the National Elevation Dataset for use in developing digital ortho imagery. Quantum Spatial performed a geodetic control survey in support of the digital orthophoto production project. A total of 3 points were used for QC testing.


Acquisition and Processing

CC ID: 1057082
Contact Role Type: Originator
Contact Type: Organization
Contact Name: Quantum Spatial, Inc

Process Steps

Process Step 1

CC ID: 1057083

Orthophoto Processing: 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 NAD 1983 2011 UTM Zone 18N, Meter. 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 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 ASPRS horizontal accuracy standards.

Process Date/Time: 2020-01-23 00:00:00
Process Contact: NGS Communications and Outreach Branch
Phone (Voice): (301) 713-3242
Email Address:

Catalog Details

Catalog Item ID: 64516
GUID: gov.noaa.nmfs.inport:64516
Metadata Record Created By: Maryellen Sault
Metadata Record Created: 2021-04-09 17:24+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2023-08-15 17:09+0000
Metadata Record Published: 2021-04-14
Owner Org: NGS
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2021-04-14
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2022-04-14