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Short Citation:
OCM Partners, 2023: 2012 Multispectral Color Orthophotography at .30m GSD, UTM z2S projection, GeoTIFF file format for American Samoa., https://www.fisheries.noaa.gov/inport/item/49496.

Item Identification

Title: 2012 Multispectral Color Orthophotography at .30m GSD, UTM z2S projection, GeoTIFF file format for American Samoa.
Short Name: 2012_american_samoa
Status: Completed
Abstract:

The 2012 American Samoa aerial photography project produced 1' (.30m) GSD multispectral digital orthoimagery for approximately 85 square miles of the American Samoa islands of Tutuila, Aunu'u, Ofu, Olosega, and Ta'u. 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, thus it combines the image characteristics of a photograph with the geometric qualities of a map.

Original contact information:

Contact Name: Mike Duncan

Contact Org: United States Geological Survey

Phone: 573-308-3579

Email: e-mail: jduncan@usgs.gov

Purpose:

The digital orthoimagery is both high resolution and spatially accurate, and can serve as a raster base image for mapping projects as well as a data source to support the derivation of new raster and vector data sets.

Notes:

11942

Supplemental Information:

Digital aerial imagery was obtained in August 2012 using a large format Microsoft Vexcel Ultracam, equipped with Airborne GPS/IMU. A total of three areas consisting of 26 flight lines with 671 frames were acquired under a single task order, in multispectral (RGB and NIR) 8 bits per band format. The imagery was acquired with a 100.5 mm focal length at an altitude of 9,000' above mean terrain, to yield a raw pixel resolution of 1' (.30m) suitable for photogrammetric mapping and orthophoto production. The 'leaf condition' was not a concern but imagery was collected in the summer of 2012 under conditions free from flooding and excessive soil moisture. Within populated areas, no more than 5% clouds, cloud shadows, smoke, and haze are permitted. In the uninhabited areas of the islands 10% of clouds, cloud shadows, smoke, and haze may exist. There is no tide coordination. 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 were pan sharpened and archived as frame imagery. All 4 bands were used in the orthophoto production. The two mission baseline information are as follows: August 2, 2012 minimum baseline length is 0.476km; maximum baseline length is 32.432km; and mean baseline length is 12.358km. August 3, 2012 minimum baseline length is 0.022km; maximum baseline length is 40.399km; and mean baseline length is 14.860km.

Keywords

Theme Keywords

Thesaurus Keyword
UNCONTROLLED
ISO 19115 Topic Category imageryBaseMapsEarthCover
None image map
None natural color orthophoto
None orthoimage
None orthophoto
None rectified image
None rectified photograph

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 AS
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 American Samoa
None Aunu'u
None Ofu
None Olosega
None Ta'u
None Tutuila

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:

These digital orthophotos are composed of 4 bands or channels of information. Each band comprises a grid of pixels containing digital numbers ranging from 0-255, and representing colors in the red, green, blue (RGB) or near infrared (NIR) portions of the electromagnetic spectrum.

Entity Attribute Detail Citation:

None

Distribution Liability:

Woolpert 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: Orthophotos were produced for USGS by Photo Science under the USGS Geospatial Production and Services Contract, Contract Number G10PC00026, Task Order G12PD00480.

Support Roles

Data Steward

CC ID: 665694
Date Effective From: 2016-05-23
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: 665696
Date Effective From: 2016-05-23
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: 665697
Date Effective From: 2016-05-23
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: 665695
Date Effective From: 2016-05-23
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: 665700
W° Bound: -170.851644
E° Bound: -169.405585
N° Bound: -14.147592
S° Bound: -14.382132

Extent Group 1 / Time Frame 1

CC ID: 665699
Time Frame Type: Range
Start: 2012-08-02
End: 2012-08-03

Spatial Information

Spatial Representation

Representations Used

Grid: Yes

Grid Representation 1

CC ID: 665690
Dimension Count: 2
Cell Geometry: Point
Transformation Parameters Available?: No

Axis Dimension 1

Dimension Type: Row
Size: 1500

Axis Dimension 2

Dimension Type: Column
Size: 1500

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:

The United States Geological Survey shall not be held liable for any errors in this data. This includes errors of omission, errors of commission, content errors, and relative and positional accuracy errors in the data. This data should not be construed to be a legal document. Primary sources from which this data was compiled must be consulted for verification of information contained in this data. This data is in the public domain, and may not be resold.

Metadata Access Constraints:

None

Metadata Use Constraints:

None

Activity Log

Activity Log 1

CC ID: 665717
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 665716
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: 718052
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Data Quality

Accuracy:

Radiometry was verified by visual inspection of the digital orthophotos. 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 was performed over a group of images during the mosaicking process in order to lighten or darken adjacent images for better color tone matching.

Horizontal Positional Accuracy:

This 0.30m Ground Sample Distance (GSD) digital ortho imagery was compiled to meet a 1.52 meter (5') horizontal accuracy at 95% confidence level(0.88-meters Root Mean Squared (RMSE) Error XY (0.62 meter RMSE X or Y) based on NSSDA testing guidelines. This accuracy requirement is not applicable in areas where the ground is obscured on the aerial imagery by foliage, prevalent smoke, or dense shadow.; Quantitative Value: 0.709 meters, Test that produced the value: RMSE at CE95 in meters. Please see Accuracy Analyst report.

Vertical Positional Accuracy:

There is no vertical component for orthophotos.

Completeness Report:

The 'leaf condition' was not a concern but imagery was collected in the summer of 2012 under conditions free from flooding and excessive soil moisture. Within populated areas, no more than 5% clouds, cloud shadows, smoke, and haze are permitted. In the uninhabited areas of the islands 10% of clouds, cloud shadows, smoke, and haze may exist. There is no tide coordination. The sun angle threshold was 30 degrees. To ensure complete coverage, photography was collected for all tiles that intersected the islands of American Samoa (Tutuila, Aunnu'u, Ofu, Olosega, and Ta'u). Orthoimages were visually inspected for completeness to ensure that no gaps or image misplacements exist within and between adjacent images.

Conceptual Consistency:

All GeoTIFF tagged data and image file sizes were validated using commercial GIS software to ensure proper loading before being archived. This validation procedure ensured correct physical format and field values for tagged elements. Seam lines and tile edges were visually inspected.

Lineage

Sources

Exterior Orientation File

CC ID: 665677
Contact Name: Photo Science
Extent Type: Discrete
Extent Start Date/Time: 2012
Source Contribution:

Exterior Orientation (EO) Parameters (x,y,z,omega,phi,kappa) were produced to provide precise photocenter locations for each frame of imagery. The two mission baseline information are as follows: August 2, 2012 minimum baseline length is 0.476km; maximum baseline length is 32.432km; and mean baseline length is 12.358km. August 3, 2012 minimum baseline length is 0.022km; maximum baseline length is 40.399km; and mean baseline length is 14.860km. Aerotriangulation was necessary to achieve the accuracy requirements of the project. | Source Geospatial Form: ASCII Text File | Type of Source Media: disc

Georeferenced Aerial Imagery

CC ID: 665675
Contact Name: Photo Science
Extent Type: Discrete
Extent Start Date/Time: 2012
Source Contribution:

Targeted ground control was collected for use in the Aerotriangulation process. Sixty-five (65) photo identifiable ground control points were selected and surveyed to adequately cover the entire state. Details of each point can be found in the full control report. | Source Geospatial Form: remote-sensing image | Type of Source Media: External Hard Drive

LiDAR_DEM

CC ID: 665676
Contact Name: Photo Science
Extent Type: Discrete
Extent Start Date/Time: 2012
Source Contribution:

Photo Science developed classified, bare earth, .LAS LiDAR data at a 1-meter nominal post spacing with a fundamental 15 cm vertical accuracy at 95% confidence interval. Some areas of Ta'u were missing LiDAR so a stereocompiled DEM was created from the imagery. | Source Geospatial Form: vector digital data | Type of Source Media: External

Orthorectified Image

CC ID: 665681
Contact Name: Photo Science
Extent Type: Discrete
Extent Start Date/Time: 2012
Source Contribution:

Orthorectified images were geometrically corrected to achieve a uniform scale. Each frame was adjusted for topographic relief, lens distortion and camera tilt. | Source Geospatial Form: remote-sensing image | Type of Source Media: disc, DVD or online

Raw Aerial Imagery

CC ID: 665674
Contact Name: Photo Science
Extent Type: Discrete
Extent Start Date/Time: 2012-08-28
Source Contribution:

The digital aerial imagery was obtained using a large format Microsoft Vexcel Ultracam. 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 9,000' above mean terrain yielding an approximate GSD of 1 foot. A minimum of 70% forward gain and 40% sidelap was collected to ensure full stereo coverage. The aerial images are used in the production of orthophotos. | Source Geospatial Form: remote-sensing image | Type of Source Media: External Hard Drive

SoftCopy Aerotriangulation

CC ID: 665678
Contact Name: Photo Science
Extent Type: Discrete
Extent Start Date/Time: 2012
Source Contribution:

SoftCopy Aerotriangulation is a computer process of densifying the ground control network from locations in a few of the digital images to numerous points in each digital image that is to be used in the mapping process. This process is dependent on the location and coordinate positions of the ABGPS and GPS photo control points as well as a precise camera calibration for the Microsoft Vexcel Ultracam camera used to capture the images. | Source Geospatial Form: ASCII Report File | Type of Source Media: disc

Stereo Imagery

CC ID: 665680
Contact Name: Photo Science
Extent Type: Discrete
Extent Start Date/Time: 2012
Source Contribution:

The stereoimages are the product of the processed stereo imagery frames and the Aerotriangulation solution. Digital imagery was produced in TIF file format, 4-band, 8-bit stereo pairs. | Source Geospatial Form: remote-sensing image | Type of Source Media: External Hard Drive

Tile definition

CC ID: 665679
Contact Name: Photo Science
Extent Type: Discrete
Extent Start Date/Time: 2012
Source Contribution:

The tile definition was used to cut orthorectified imagery into manageable, usable images in UTM projection. The UTM deliverables defined by this tile definition were modeled after the U.S. National Grid and references NAD83 UTM projection, units of Meters. Each tile is 1500 X 1500 meters. | Source Geospatial Form: vector digital data | Type of Source Media: disc

Tiled Orthophoto

CC ID: 665682
Contact Name: Photo Science
Extent Type: Discrete
Extent Start Date/Time: 2012
Source Contribution:

The tiled orthophoto was the result of mosaicking orthorectified imagery and using the tile definition to cut the data into manageable, usable orthophotos. 173 ortho tiles for delivery to USGS were created. | Source Geospatial Form: remote-sensing image | Type of Source Media: disc, DVD or online

Process Steps

Process Step 1

CC ID: 665683
Description:

Sixty-five (65) photo identifiable control locations were selected and surveyed to adequately cover the entire state. Details of each point can be found in the full control report. Accuracies of 10cm or better (horizontally and vertically) were required. | Source Produced: Georeferenced Aerial Imagery

Process Date/Time: 2012-01-01 00:00:00

Process Step 2

CC ID: 665684
Description:

New digital aerial imagery was obtained in the spring of 2012 using a large format Microsoft Vexcel Ultracam equipped with Airborne GPS/IMU. A total of 22 flight lines with 671 frames were collected in multispectral (RGB and NIR) 12 bits per band format. The imagery was acquired with a 100.5 mm focal length at an altitude of 9,000' above mean terrain, to yield a raw pixel resolution of 1' (.30 m) suitable for photogrammetric mapping and orthophoto production. The 'leaf condition' was not a concern but imagery was collected in the summer of 2012 under conditions free from flooding and excessive soil moisture. Within populated areas, no more than 5% clouds, cloud shadows, smoke, and haze are permitted. In the uninhabited areas of the islands 10% of clouds, cloud shadows, smoke, and haze may exist. There is no tide coordination. The sun angle threshold was 30 degrees. To ensure complete coverage, photography was collected for all tiles that intersected the islands of American Samoa (Tutuila, Aunnu'u, Ofu, Olosega, and Ta'u). Orthoimages were visually inspected for completeness to ensure that no gaps or image misplacements exist within and between adjacent images. | Source Produced: Raw Aerial Imagery

Process Date/Time: 2012-01-01 00:00:00

Process Step 3

CC ID: 665685
Description:

Imagery and AGPS/IMU data is downloaded from the hard drive on the plane to the hard drive on the ground. AGPS/IMU mission data is processed together with continuously collected ground-based CORS GPS base station data in forward and reverse directions. This precisely determines the aerial camera's position and orientation in the terrain (project) coordinate system and allows for correct orientation of the imagery. | Source Produced: Exterior Orientation File

Process Date/Time: 2012-01-01 00:00:00

Process Step 4

CC ID: 665686
Description:

The EOFILE, raw frames, and control points were input into ISAT in order to complete the SoftCopy Aerotriangulation, described in ATSOL source contribution, and assembled into a block. A second degree block adjustment is run along with the full least squares bundle adjustment. Once the last set of blunders and adjustments are complete, a final block bundle adjustment is run to produce the final solution. The final adjustment of the block is accomplished by using a rigorous simultaneous least squares bundle adjustment. The general procedure is to remove all blunders from the data using automatic blunder detection. The bundle adjustment is then run with minimal ground control to test the photogrammetric measurements for consistency. Next, the full ground control data set, including ABGPS data, is added to the adjustment. The horizontal control is then tightened and the effect on the vertical control and the photogrammetric residuals are inspected. The final adjustment makes sure that all of the measurements are in balance with each other and properly represent the actual conditions. | Source Produced: Stereo Imagery

Process Date/Time: 2012-01-01 00:00:00
Source: Raw Aerial Imagery

Process Step 5

CC ID: 665687
Description:

The rectification process required as input a digital elevation model (LiDAR_DEM), imagery (IMG1) and soft copy aerotriangulation solution (ATSOL). The orthorectified imagery was produced using Intergraph Orthopro software. It used ImageStation Photogrammetric Manager (ISPM) for photogrammetry project setup, file management, and importing triangulation data from a user defined ASCII file (ATSOL). The ortho project records all the operations, including all the parameters that are defined through the OrthoPro workflow, such as the project area coordinates, pixel size, rotation angle, ISPM project and its unorthorectified source images, product areas (TLDEF) orthorectification settings, seamlines and so on. The results are single frame images that have yet to be mosaicked into manageable tiled orthos. The single frame orthos were checked for accuracy against the surveyed ground control before further image editing.

Process Date/Time: 2012-01-01 00:00:00

Process Step 6

CC ID: 665688
Description:

Orthorectified imagery was mosaicked, locally color-balanced and cut to the tile definition boundaries (TLDEF) using Intergraph Orthopro software. Tiled orthophotos then went through a rigorous manual QC process to evaluate for remaining hotspots (sun reflectance over water), tone quality, color balance and the feathering area along seamlines. Any imperfections at this point were manually edited. Clouds and cloud shadows were attempted to be minimized by using alternate views from adjoining frames. The tiled images were then converted to the required file format (GeoTIFF) and transferred to external hard drives for delivery to USGS. | Source Produced: Tiled Orthophoto

Process Date/Time: 2012-01-01 00:00:00

Catalog Details

Catalog Item ID: 49496
GUID: gov.noaa.nmfs.inport:49496
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: 2018-02-08
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2018-02-08
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2019-02-08