ATCOR Predefined Sensors and Database
Supported Satellite Sensors
- Landsat-4/5 TM, MSS
- Landsat-7 ETM+, panchromatic band, http://lptwww.gsfc.nasa.gov/IAS/handbook/handbook_htmls/chapter6/htmls/
- Landsat-8 OLI: 8 multispectral bands (440 - 2200 nm) + two thermal bands, spatial resolution 30 m, swath 185 km. ( http://ldcm.nasa.gov)
- SPOT 1-3 HRV, multispectral and panchromatic
- SPOT 4-5 (http://www.spotimage.com)
- Pleiades-1: 4 multispectral bands (blue, green, red, NIR), spatial resolution 2 m, swath 20 km.(http://smsc.cnes.fr/PLEIADES/)
- IRS-1A/-1B : LISS-2 with 36 m resolution, 4 spectral bands (B/G/R/NIR)
- IRS-1C/-1D : LISS-3 (24 m, 4 bands: G/R/NIR + SWIR1 with 70 m) , panchromatic (6 m), WiFS with 188 m (R/NIR bands) (http://www.isro.org)
- IRS-P6 : LISS-3 with 20m, 4 bands (G/R/NIR/SWIR1 = 1.6 um); LISS-4 with 5 m, 3 bands (G/R/NIR) red band used as high resolution channel; AWiFS with 60 m, 4 bands (G/R/NIR/SWIR1) (http://www.isro.org)
- Cartosat, two panchromatic cameras (500-850 nm) with 2.5 m resolution, fore: +26 deg tilt, aft: -5 deg tilt (www.isro.org)
- Ikonos-2, multispectral (4 m, B/G/R/NIR) and panchromatic (1 m) (http://www.spaceimaging.com)
- Quickbird, multispectral and panchromatic, bands similar to Ikonos-2 (http://www.digitalglobe.com)
- Orbview-3, multispectral (4 m) and panchromatic (1 m), bands similar to Ikonos-2 (www.orbimage.com)
- MOS-B, 520 m resolution, 200 km swath, 13 bands (http://www.isro.org/irsp3.htm)
- MERIS, 300 m resolution, 575 km swath, 15 bands (http://www.envisat.esa.int)
- ASTER (http://asterweb/jpl.nasa.gov/ )
- ALI - Advanced Land Imager, 9 multispectral bands, EO-1 instrument, has the 6 reflective TM bands and 3 additional bands, 30 m resolution (http://eo1.usgs.gov/instru/ali.asp)
- SAC-C / MMRS, 175 m resolution, 360 km swath, 5 bands similar to TM bands 1 - 5 (http://www.conae.gov.ar/caratula.html)
- DMC : 32 m resolution, 3 bands (G/R/NIR), 600 km swath (http://www.dmcii.com), "Disaster Monitoring Constellation", a constellation of 4 spacecrafts in orbit (Dec. 2004), more are being built.
- Formosat-2 : multispectral (8 m, B/G/R/NIR), and panchromatic (2 m), 24 km swath (http://www.nspo.org.tw, http://www.spotimage.fr),
- KOMPSAT-2 : multispectral (4 m, B/G/R/NIR), and panchromatic (1 m), 15 km swath (http://www.spotimage.fr),
- ALOS AVNIR-2 (10 m, B/G/R/NIR), 70 km swath ( http://www.esa.int/esaEO/SEM0SXMZCIE_planet_0.html).
- RapidEye : five bands (440-850 nm) , spatial resolution 6.5 m, swath 77 km (http://www.rapideye.de),
- GeoEye-1 : four multispectral bands (B/G/R/NIR), spatial resolution 1.6 m, swath 15.2 km (http://www.geoeye.com),
- Worldview-2 : 8 multispectral bands (430 - 920 nm), spatial resolution 1.84 m, swath 16.4 km, (http://www.digitalglobe.com).
- THEOS: 4 multispectral bands (480 - 840 nm), spatial resolution 15m, panchromatic band: 2 m resolution. (www.gistda.or.th)
- Ziyuan-3 (ZY-3): The Chinese multispectral satellite, spatial resolution 2.5-4m http://www.dragoninspace.com/earth-observation/ziyuan3.aspx
An processing module is included in ATCOR-3 for hyperspectral sensors such as Hyperion or CHRIS/Proba; these sensors do not have a stable spectral calibration or a large number of spectral modes. Therefore, the atmospheric LUTs frequently have to be recalculated in compliance with the updated spectral calibration. A simple interface is available to specify the required sensor information (number of channels, field-of-view, and channel spectral response curves). This information is subsequently used to calculate the sensor-specific atmospheric LUTs from the monochromatic atmospheric database supplied with the add-on module of ATCOR. Although this add-on module is mainly intended for hyperspectral sensors it can also be employed for definition of new multispectral instruments. The distribution includes examples of the sensor definition files for CHRIS (hyperspectral template), ASTER (multispectral template), and Hyperion.
Examples of supported hyperspectral satellite sensors
- CHRIS "Compact High Resolution Imaging Spectrometer", spectral bands from 400 - 1000 nm, 17 - 34 m resolution depending on mode. Modes 1, 3, 4, 5 are supported ( http://earth.esa.int/missions/thirdpartymission/proba.html)
- Hyperion, 30 m resolution, 7.5 km swath, 242 bands (http://eo1.usgs.gov/instru/hyperion.asp)
- Atmospheres with different vertical profiles of pressure, air temperature, humidity, ozone content (water vapor columns from 0.4 to 5.0 [g/cm2] sea-level-to-space)
- Various aerosol types (rural, urban, maritime, desert)
- Visibilities (surface meteorological range) 5 - 120 km (hazy to very clear)
- Ground elevations 0 - 2.5 km, extrapolated for higher elevated regions
- Solar zenith angles 0 - 70 degree
- Tilt geometries (e.g. SPOT, Ikonos) with tilt angles up 50 degrees are supported
- A discrete set of relative azimuth angles (0 - 180 deg., increment 30 deg.) is provided for the atmospheric LUTs of tilt sensors, interpolation is applied if necessary
- Capability for mixing of atmospheres (water vapor, aerosol)
The sensor-specific database is available for the standard multispectral sensors, i.e., Landsat TM, ETM+, SPOT, IRS-P6 etc. For sensors with varying spectral modes, e.g., CHRIS, the ATCOR add-on module for hyperspectral sensors is recommended which allows user-defined sensors. Two monochromatic spectral databases are delivered with the ATCOR-3 software to be able to generate the required sensor-specific atmospheric LUTs. The first database is intended for nadir-viewing sensors. Its spectral sampling grid is 0.4 nm from 350 nm to 2550 nm. The second one is intended for CHRIS and besides nadir it includes the tilt geometries of 35 degree and 55 degree with a spectral sampling grid of 1 nm covering the CHRIS wavelength range of 400 nm to 1050 nm.
The databases are calculated with the Modtran®-5 code using the scaled DISORT option, and the more accurate correlated k algorithm in atmospheric absorption regions.