Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office for Coastal Management (OCM)
20110912
Coastal California Digital Imagery
v.1
map
GeoTIFF
1
Charleston, SC
NOAA's Ocean Service, Office for Coastal Management (OCM)
https://coast.noaa.gov/dataviewer/#/imagery/search/where:ID=1168
https://coast.noaa.gov/htdata/raster1/imagery/CoastalCA_2009_1168
This digital ortho-imagery dataset is a survey of coastal California. The project area consists of approximately 3774 square miles. The project design of the digital ortho-imagery data acquisition was developed to achieve a 30 cm pixel resolution. Fugro EarthData, Inc. acquired 289 flight lines in 36 lifts from August 26, 2010 through November 29, 2010. Digital ortho-imagery data collection was performed with Conquest and King Air aircrafts, utilizing a Leica ADS40-SH52 sensor. During the time of image acquisition at least two dual frequency GPS receivers are utilized. One receiver, acting as the remote, was operated on board the aircraft with the antenna located over the camera. For differential GPS processing, a second receiver was used on land as the base station. These receivers were in constant operation during the imagery collection and GPS phase data was collected at an epoch rate of at least 1 second. After processing the differential GPS solution by using the remote and master station a final estimated trajectory is generated. The smoothed best estimate trajectory, or sbet, is then in combination with ground surveyed points to strengthen the geospatial accuracy of the imagery. The digital ortho-imagery was cut to tiles measuring 1500 meters by 1500 meters.
The mission of the Office for Coastal Management is to support the environmental, social, and economic well being of the coast by linking people, information, and technology. These digital ortho-imagery data are intended to support the local Coastal Zone Managers in their decision-making processes, including applications such as sea level rise.
The information in this report is the result of digital ortho-imagery surveys performed on the dates indicated and the general conditions at the time of flight.
20110912
publication date
As needed
-124.455747
-117.005324
+42.042545
+32.489401
ISO 19115 Topic Category
imageryBaseMapsEarthCover
None
Digital Ortho-imagery
Orthoimage
Orthophoto
Orthophotography
Ortho
ADS40-SH52
Aerotriangulation (AT)
Digital Surface Model (DSM)
Geographic Names Information System
US
Coastal California
None
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.
NOAA Office for Coastal Management
mailing and physical
2234 South Hobson Avenue
Charleston
SC
29405-2413
843-740-1202
coastal.info@noaa.gov
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office for Coastal Management (OCM); the California State Coastal Conservancy (SCC) Ocean Protection Council (OPC); and the Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX).
None
Unclassified
N/A
Microsoft Windows XP Version 2002 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722
The digital ground-orthophotos were created to be fully compliant with a horizontal positional accuracy of 2 meters or better at the 95% confidence level as computed in accordance with the FGDC National Standard for Spatial Data Accuracy (NSSDA).
Compliance with the accuracy standard was ensured by the collection of ground control and the establishment of a GPS base station at the following airports: McClellan-Palomar, Oxnard, Monterey Peninsula, Hayward Executive, Charles M. Schulz - Sonoma County, Shelter Cove, Ukiah Municipal, Jack McNamara Field, Arcata, and Santa Maria Public. The following checks were performed: 1) The digital ortho-imagery accuracy was validated by performing a full analytical bundle aerotriangulation adjustment and then checking it against the ground control prior to generating a digital surface model (DSM) or other products. 2) Digital ortho-imagery was validated through an inspection of edge matching and visual inspection for quality.
The following methods are used to ensure digital ortho-imagery data accuracy: 1) Use of a ground control network utilizing GPS survey techniques; 2) Use of airborne GPS and IMU during the acquisition of imagery; and 3) Measurement of quality control ground survey points within the finished product. The following software was used for the validation: 1) Pixel Factory; 2) ESRI ArcInfo; 3) Adobe Photoshop; and 4) Fugro EarthData Proprietary software.
The spatial accuracy of the georeferenced imagery is 2 meters or better at the 95% confidence level as computed in accordance with the FGDC National Standard for Spatial Data Accuracy (NSSDA).
Fugro EarthData, Inc.
20110826
Aerial Acquisition of Coastal California Digital Imagery
External hard drive
20100826
20110823
ground condition
Aerial Digital Imagery Acquisition
The aerial imagery acquisition for Coastal California was flown to support the creation of digital ortho-imagery with a 30 cm pixel resolution. Fugro EarthData, Inc. acquired 296 flight lines in 37 lifts from August 26, 2010 through November 29, 2010; and August 23, 2011 (this lift was flown to minimize building lean). The lines were flown at an average of 9,490 feet above mean terrain, using the Leica ADS40-SH52 digital airborne sensor, serial numbers SH024, SH110, and SH022.
TerraSurv, Inc.
20110214
Report of Survey - California Coast Ground Control for ADS-40 Digital Photography
model
electronic mail system
20090925
20101021
ground condition
Ground Control
TerraSurv, Inc. under contract to Fugro EarthData, Inc. successfully established ground control for coastal California. A total of 241 ground control points were acquired; of which 75 were successfully located and used as ground control in the final block adjustments, and 126 were used as checkpoints. GPS was used to establish the control network. The horizontal datum was the North American Datum of 1983 (NAD83, NSRS2007). The vertical datum was the North American Vertical Datum of 1988 (NAVD88).
All acquired ADS40-SH52 data went through a preliminary review to assure that complete coverage was obtained and that there were no gaps between flight lines before the flight crew left the project site. Once back in the office, the data was brought through a comprehensive quality check to ensure completeness, image quality and resolution. There are essentially three steps to this processing: 1) GPS/IMU Processing - Airborne GPS and IMU data was immediately processed using ground GPS base station data, which is available immediately after collection. 2) Raw ADS40-SH52 Image QC - A technician performed visual inspection of the raw ADS40-SH52 images on selected bands for each collected flight lines. This step ensures proper function of the sensor. 3) Verification of Coverage and Data Quality - The raw RGB images for each collected flight lines were rectified using existing DEM and the GPS/IMU solution in Fugro proprietary software. The technician visually reviewed all rectified images to ensure completeness and resolution of acquisition for all flight lines and to identify any data gaps, clouds, shadows and any un-predicted issues in project area. All issues that did not meet project specifications were rejected and recollected.
20101201
Fugro EarthData, Inc.
Rich McClellan
Project Manager
mailing and physical
7320 Executive Way
Frederick
MD
21704
USA
301.948.8550
301.963.2064
rmcclellan@fugro.com
Mon-Fri 8:30am to 5:00pm
Once the ADS40-SH52 data was collected and accepted, the Aerotriangulation (AT) phase began. Following is a step-by-step description of the AT process: 1) AT was accomplished as a component of Fugro EarthDatas exclusive Pixel Factory process. The ground control, GPS, and IMU solution was ingested and tie points between strips were identified. Normally, only five tie points are needed between adjacent flight lines. We used automated tie point selection function in Pixel Factory which allowed us to increase the amount of tie points. 2) The technician performed AT process and applied the bundle adjustment result to the images of each AT block (consisting of multiple lifts or sorties). The results of the adjustment were verified through the generation of the full resolution panchromatic ortho chips over the ground control points for the data sortie. The ortho chips were inspected by the photogrammetric technician to identify any errors in the adjustment to ensure the accuracy meets project specification. The technician also generated and visually reviewed ortho strips covers across all flight lines to ensure edge matching between flight lines. Documentation of the methodology and AT report containing the RMSE and residual calculations of the tie and ground control points used in block adjustment was prepared and delivered to NOAA OCM.
20110118
Fugro EarthData, Inc.
Rich McClellan
Project Manager
mailing and physical
7320 Executive Way
Frederick
MD
21704
USA
301.948.8550
301.963.2064
rmcclellan@fugro.com
Mon-Fri 8:30am to 5:00pm
The following section describes the Pixel Factory digital image production sequence. This workflow is unique to Fugro EarthData, Inc. and has been developed specifically for push-broom sensors like the ADS40-SH52. This is a mature, stable workflow and incorporates all production components into an integrated series of tools to accomplish elevation model development, ortho production, and finishing. 1) The digital elevation data was correlated using the stereoscopic CCDs that are part of the ADS40 camera system. Using several tools that are part of the Pixel Factory workflow, a digital surface model (DSM) was correlated at an appropriate post spacing for the final accuracy requirement. The Pixel Factory correlation algorithm computed the X,Y,Z value for each DSM post utilizing every stereo angle that was available. A series of DSM files were created for acquisition block, one for each stereo look angle. A mosaic was then created from the separate DSM files where the best vertical value for each posting was selected from all look angles compared against the aerotriangulation adjustment which is incorporated into the mosaic. 2) The digital imagery for each acquisition sortie was differentially rectified to produce 4-band ortho-imagery at the appropriate pixel resolution. The Pixel Factory used the cubic convolution algorithm in its processing to remove image displacement due to topographic relief, tip and tilt of the aircraft at the moment of acquisition. Each individual strip of imagery from each flight line was rectified and radiometrically processed. 3) In order to achieve maximum efficiency in data processing, the digital orthophoto technician produced quicklooks for automated seamline generation and radiometric processing of the imagery. Quicklooks are a rendition of each scale of imagery at 1/64 of the actual resolution of the orthophotography. The goal of the radiometric adjustment is to minimize tonal changes of ground features on adjacent strips of imagery giving a balanced look across the entire project. 4) The results of the radiometric adjustment and seamline generation were used to create a mosaic for each block. The seamlines were then reviewed to ensure that the aesthetic impact on features and the final product was minimized. The data for all blocks was then processed to create a uniform and seamless appearance for the entire area. 5) The final ortho-image tiles were processed to the required projection and datum and are clipped out using the approved tiling grid and naming convention. 6) Fugro EarthData provided NOAA OCM with the pilot ortho-imagery for selected portions of the overflight at full resolution for review and approval of tone (color) and contrast of the imagery. 7) Digital ortho-imagery was then quality controlled internally. Based on the feedback from QC procedures, Fugro EarthData performed final corrections to the orthoimage, depending on the nature of the artifacts to be corrected. Minor artifacts were corrected using Adobe Photoshop in an interactive editing session. 8) Final digital ortho-imagery tiles were written out into GeoTIFF deliverable format with internal corresponding georeferencing and copied to hard drives for delivery.
20110906
Fugro EarthData, Inc.
Rich McClellan
Project Manager
mailing and physical
7320 Executive Way
Frederick
MD
21704
USA
301.948.8550
301.963.2064
rmcclellan@fugro.com
Mon-Fri 8:30am to 5:00pm
0
Raster
Pixel
5000
5000
1
Universal Transverse Mercator
11
0.999600
-117.000000
+00.000000
500000.000000
0.000000
row and column
0.300000
0.300000
meters
North American Datum of 1983 (National Spatial Reference System 2007)
Geodetic Reference System 80
6378137.000000
298.257222
Leica ADS40-SH52 sensors; push-broom; serial numbers: SH024, SH110, and SH022; 4-band multi-spectral ortho-imagery tiles with 30 cm pixel ground resolution, configured to display as 8-bit color-infrared and capable of being redisplayed as 8-bit natural color.
see process steps within this record
NOAA Office for Coastal Management
mailing and physical
2234 South Hobson Avenue
Charleston
SC
29405-2413
843-740-1202
coastal.info@noaa.gov
Downloadable Data
Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners.
https://coast.noaa.gov/dataviewer. This data set is dynamically generated based on user-specified parameters.
20160523
20160523
NOAA Office for Coastal Management
mailing and physical
2234 South Hobson Avenue
Charleston
SC
29405-2413
843-740-1202
coastal.info@noaa.gov
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
None
None