Landsat 7 ETM/1G satellite imagery - Hawaiian Islands cloud-free mosaics

Cloud-free Landsat satellite imagery mosaics of the islands of the main 8 Hawaiian Islands (Hawaii, Maui, Kahoolawe, Lanai, Molokai, Oahu, Kauai and Niihau). Landsat 7 ETM (enhanced thematic mapper) is a polar orbiting 8 band multispectral satellite-borne sensor. The ETM+ instrument provides image data from eight spectral bands. The spatial resolution is 30 meters for the visible and near-infrared (bands 1-5 and 7). Resolution for the panchromatic (band 8) is 15 meters, and the thermal infrared (band 6) is 60 meters. The approximate scene size is 170 x 183 kilometers (106 x 115 miles). A Nadir-looking system, the sensor has provided continuous coverage since July 1999, with a 16-day repeat cycle. The Level 1G product is radiometrically and geometrically corrected (systematic) to the user-specified parameters including output map projection, image orientation, pixel grid-cell size, and resampling kernel. The correctional gorithms model the spacecraft and sensor using data generated by onboard computers during imaging. Sensor, focal plane, and detector alignment information provided by the Image Assessment System (IAS) in the Calibration Parameter File (CPF) is also used to improve the overall geometric fidelity. The resulting product is free from distortions related to the sensor (e.g., jitter, view angle effect), satellite (e.g., attitude deviations from nominal), and Earth (e.g., rotation, curvature). Residual error in the systematic L1G product is less than 250 meters (1 sigma) inflat areas at sea level. The systematic L1G correction process does not employ ground control or relief models to attain absolute geodetic accuracy.

The Landsat Project is a joint initiative of the U.S Geological Survey(USGS) and the National Aeronautics and Space Administration (NASA) to gather Earth resource data using a series of satellites. NASA was responsible for developing and launching the spacecrafts, while the USGS is responsible for flight operations, maintenance, and management of all ground data reception, processing, archiving, product generation, and distribution. The primary objective of the Landsat Project is to ensure a collection of consistently calibrated Earth imagery. Landsat's GlobalSurvey Mission is to establish and execute a data acquisition strategy that ensures repetitive acquisition of observations over the Earth's landmass, coastal boundaries, and coral reefs; and to ensure the data acquired are of maximum utility in supporting the scientific objectives of monitoring changes in the Earth's land surface and associated environment.

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Sensor Type - Multispectral Sensor Name - Landsat 7 Sensor Homepage URL -http://landsat7.usgs.gov Sensor Platform - Satellite Sensor Orbit Type -Near-polar, Sun-synchronous, Near-circular Sensor Revisit Frequency - 16days Sensor Launch Date - 19990415 Nominal Azimuth Nominal ElevationNominal Altitude - 705 kilometers Incidence Angle (look) - 98.2 degreesSun Angle Azimuth Sun Angle Elevation Orbit Direction Mode Name - Normal,Thermal, Panchromatic Mode Description - Normal (Data for bands 1-4 arecollected at the prime focal plane and are transmitted to ground on datachannel 1. Data for bands 5 and 7 are collected at the cold focal planeand are transmitted to ground on data channel 1 and data channel 2.),Thermal (Data for band 6 are collected at the cold focal plane and aretransmitted to ground on data channel 1.), Panchromatic (Panchromatic dataare collected on the prime focal plane and are transmitted to ground ondata channel 2.) Mode Resolution - Normal (30), Thermal (60), Panchromatic(15) Mode Resolution Units - Meters Mode Resolution Notes Swath Width -183 Swath Width Units - Kilometers Swath Width Notes Stereo Stereo PairGUID Day or Night Overlap Path Num Row Num Weather Conditions Flight LineID Flight Frame ID Film Roll ID Original Frame Size Scan DPI Beam PositionName Beam Incidence Angle Nominal Beam Incidence Angle Low Beam IncidenceAngle High Band ID - 1-8 Band Name - 1 (Blue), 2 (Red), 3 (Green), 4(NIR), 5 (SWIR), 6 (Thermal SWIR), 7 (SWIR), 8 (Panchromatic) BandWavelength Low - 1 (.450), 2 (.525), 3 (.630), 4 (.775), 5 (1.550), 6(10.400), 7 (2.090), 8 (.520) Band Wavelength High - 1 (.515), 2 (.605), 3(.690), 4 (.900), 5 (1.750), 6 (12.500), 7 (2.350), 8 (.900) BandWavelength Units - micrometers Band Frequency Band Frequency Units Band

These data were prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data have been used by NOAA, no warranty, expressed or implied, is made by NOAA as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by NOAA in the use of these data or related materials.None

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The nominal resolution is achieved within 30 degrees of nadir. Geodetic accuracy is monitored using calibration scenes containing ground control points. Scenes are first radiometrically and geometrically corrected. Control point locations are then measured on the processed imagery and compared to known ground locations. Any terrain effects are removed analytically in the comparison. The post-calibration geodetic accuracy of systematic ETM+ products is approximately 50 meters which is much better than 250 meter specification placed on the system.Band-to-band registration measures the relative alignment of the eight ETM+ spectral bands after processing to Level 1Gs. Measured registration between the primary and cold focal planes in the line direction is typically 0.08-0.10 pixels, well below the design specification limit of 0.17 pixels.Image registration accuracy is measured using cloud-free images of two separate calibration sites. One meter resolution DOQs were mosaicked and reduced to 15 meter resolution. The image registration assessment was performed in two ways. First, the ETM+ images were compared against the DOQ reference images. This provides a measure of image distortion relative to an absolute reference. The 1 sigma accuracy for registration to DOQs is 4.3 meters along scan and 4.2 meters across scan. Second, two ETM+ scenes were cross correlated. This provides a measure of image distortion that changes scene-to-scene although systematic calibration distortions may cancel out. The 1 sigma accuracy for ETM+ to ETM+ registration is 3.2 meters along scan and 1.9 meters across scan.; Quantitative Value: 50 meters, Test that produced the value: Meters

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