Abstract: Landsat panchromatic satellite imagery scene of the Mekong Delta area in Vietnam. Path 125, Row 52. 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 correction algorithms 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) in flat areas at sea level. The systematic L1G correction process does not employ ground control or relief models to attain absolute geodetic accuracy.
Purpose: 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 Global Survey Mission is to establish and execute a data acquisition strategy that ensures repetitive acquisition of observations over the Earths land mass, 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 Earths land surface and associated environment.
Supplemental Information: 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 - 16 days Sensor Launch Date - 19990415 Nominal Azimuth Nominal Elevation Nominal Altitude - 705 kilometers Incidence Angle (look) - 98.2 degrees Sun Angle Azimuth Sun Angle Elevation Orbit Direction Mode Name - Normal, Thermal, Panchromatic Mode Description - Normal (Data for bands 1-4 are collected at the prime focal plane and are transmitted to ground on data channel 1. Data for bands 5 and 7 are collected at the cold focal plane and 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 are transmitted to ground on data channel 1.), Panchromatic (Panchromatic data are collected on the prime focal plane and are transmitted to ground on data 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 Pair GUID Day or Night Overlap Path Num 125 Row Num 52 Weather Conditions Flight Line ID Flight Frame ID Film Roll ID Original Frame Size Scan DPI Beam Position Name Beam Incidence Angle Nominal Beam Incidence Angle Low Beam Incidence Angle High Band ID - 1-8 Band Name - 1 (Blue), 2 (Red), 3 (Green), 4 (NIR), 5 (SWIR), 6 (Thermal SWIR), 7 (SWIR), 8 (Panchromatic) Band Wavelength 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) Band Wavelength Units - micrometers Band Frequency Band Frequency Units Band Description - 1 (Designed for water body penetration, soil and vegetation discrimination, and forest-type mapping), 2 (Matches the green reflectance peak of vegetation. Recommended for vegetation discrimination and plant vigor.), 3 (This band operates in the chlorophyll absorption region and is best for detecting roads, bare soils, and vegetation types.), 4 (This band is used to estimate biomass. Although it separates water bodies from vegetation and discriminates soil moisture, it is not as effective as TM3 for road identification.), 5 (Considered to be the best single band overall. It discriminates roads, bare soils, and water. It also provides a good contrast between different types of vegetation and has excellent atmospheric and haze penetration.), 6 (This band responds to thermal radiation emitted by the target. Thermal radiation is closely related to soil moisture and the height and temperature of vegetation and is best for measuring plant heat stress and thermal mapping. Unlike the other bands, the thermal infrared band has a resolution of 120 m.), 7 (This band is useful for discriminating mineral and rock types and for interpreting vegetation cover and soil moisture.), 8 (The panchromatic band enhances the capability to distinguish tree density classes -- an important development, because density directly affects fuel moisture content and wind speeds near the ground.)

Progress: Complete
Update Frequency: None planned

Theme Keywords: ESRI standard theme codes are used for relating FGDC metadata to the corresponding ISO categories., imageryBaseMapsEarthCover
Place Keywords: Vietnam, Cambodia, Mekong Delta

Access Constraints: None
Usage Constraints: None