| Title | Aerosol Optical Depth for Atmospheric Correction of AVHRR Composite Data |
| Download | Downloads (Preprint) |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Fedosejevs, G; O'Neill, N; Royer, A; Teillet, P M; Bokoye, A I; McArthur, B |
| Source | Canadian Journal of Remote Sensing vol. 26, issue 4, 2000 p. 273-284, https://doi.org/10.1080/07038992.2000.10874778 |
| Image |  |
| Year | 2000 |
| Alt Series | Earth Sciences Sector, Contribution Series 20042845 |
| Publisher | Informa UK Limited |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Subjects | remote sensing; GeoComp-n; AVHRR; NOAA; AEROCAN; Data processing |
| Illustrations | tables; graphs |
| Released | 2014 07 31 |
| Abstract | The Canada Centre for Remote Sensing (CCRS) Geocoding and Compositing system (GeoComp-n) processes the Advanced Very High Resolution Radiometer (AVHRR) data from the United States National Oceanic and
Atmospheric Administration (NOAA) series of satellites. The GeoComp-n system produces single- or multi-date composite maps of surface reflectance of the Canada landmass in the AVHRR visible and near-infrared spectral bands at a spatial resolution of
1 km. The data must first be processed into accurate geophysical units in order to utilize these maps and their derived products for various global climate and land cover change studies. In the case of satellite data, this not only implies the
accurate radiometric calibration but also the proper atmospheric correction of image data. One of the key parameters required for atmospheric correction is the aerosol optical depth. The Canadian sunphotometer network, AEROCAN, provides spatially
sparse but near real-time (seasonal) aerosol optical depth coverage across Canada. One of the goals of AEROCAN is to develop an aerosol climatology that can be used for operational atmospheric correction of satellite data. This research note reviews
the current holdings in the AEROCAN aerosol database after cloud screening. The data tables and seasonal profiles presented support the conclusion at this time that a single, Canada-wide, time-invariant optical depth is acceptable for the first order
operational atmospheric correction of AVHRR composite image data. The best estimate of this aerosol optical depth at a wavelength of 500 nm (AOD500) is 0.07, with an uncertainty of +0.070/-0.035, as generated from the AEROCAN database. This
corresponds to an aerosol optical depth at a wavelength of 550 nm (AOD550) of 0.062, with an uncertainty of +0.062/-0.031, for purposes of the atmospheric correction code in GeoComp-n. A sensitivity study demonstrates that this uncertainty in AOD500
produces an absolute error in surface reflectance of +1% for the worst case of a black spruce forest, which is acceptable for GeoComp-n with an accuracy requirement of +5%. |
| GEOSCAN ID | 219647 |
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