49496
2012 Multispectral Color Orthophotography at .30m GSD, UTM z2S projection, GeoTIFF file format for American Samoa.
2012_american_samoa
Data Set
Published / External
49403
Imagery - partner (no harvest)
Project
Completed
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
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.
11942
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.
Theme
ISO 19115 Topic Category
imageryBaseMapsEarthCover
Theme
image map
Theme
natural color orthophoto
Theme
orthoimage
Theme
orthophoto
Theme
rectified image
Theme
rectified photograph
Spatial
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
Spatial
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
Spatial
American Samoa
Spatial
Aunu'u
Spatial
Ofu
Spatial
Olosega
Spatial
Ta'u
Spatial
Tutuila
Office for Coastal Management
Charleston
SC
Data Set
Unknown
Image (digital)
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.
None
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.
Orthophotos were produced for USGS by Photo Science under the USGS Geospatial Production and Services Contract, Contract Number G10PC00026, Task Order G12PD00480.
Data Steward
2016-05-23
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Distributor
2016-05-23
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Metadata Contact
2016-05-23
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Point of Contact
2016-05-23
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Ground Condition
-170.851644
-169.405585
-14.147592
-14.382132
Range
2012-08-02
2012-08-03
Yes
2
Point
No
Row
1500
Column
1500
Unclassified
https://coast.noaa.gov/dataviewer. This data set is dynamically generated based on user-specified parameters.;
None
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.
None
None
2024-01-10
https://coast.noaa.gov/dataviewer/#/imagery/search/where:id=1417/details/1417
2016-05-23
Organization
NOAA Office for Coastal Management
custom download app
Not Applicable
Uncompressed
2024-01-10
https://coastalimagery.blob.core.windows.net/digitalcoast/American_Samoa_2012_1417/index.html
2016-05-23
Organization
NOAA Office for Coastal Management
data files
GeoTIFF
Uncompressed
2016-05-23
Date that the source FGDC record was last modified.
2017-11-14
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.
2018-02-08
Partial upload of Positional Accuracy fields only.
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.
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.
There is no vertical component for orthophotos.
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.
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.
Exterior Orientation File
Photo Science
Discrete
2012
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
Photo Science
Discrete
2012
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
Photo Science
Discrete
2012
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
Photo Science
Discrete
2012
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
Photo Science
Discrete
2012-08-28
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
Photo Science
Discrete
2012
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
Photo Science
Discrete
2012
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
Photo Science
Discrete
2012
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
Photo Science
Discrete
2012
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
1
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
2012-01-01T00:00:00
2
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
2012-01-01T00:00:00
3
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
2012-01-01T00:00:00
4
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
2012-01-01T00:00:00
Raw Aerial Imagery
5
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.
2012-01-01T00:00:00
6
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
2012-01-01T00:00:00
gov.noaa.nmfs.inport:49496
Anne Ball
2017-11-15T15:15:09
Kirk Waters
2024-01-10T20:34:11
2018-02-08
OCM Partners
OCMP
1002
Public
No
2018-02-08
1 Year
2019-02-08