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SAFARI 2000 MAPSS MOD05_L2 Water Vapor Summary Data for Southern Africa

Data Set Overview

Data setSAFARI 2000 MAPSS MOD05_L2 Water Vapor Summary Data for Southern Africa
DOI10.3334/ORNLDAAC/815
Release date2005-10-03
ProjectSAFARI 2000 (S2K)
Time Period2000-02-24 to 2002-03-04

Description

The MODIS (Moderate Resolution Imaging Spectroradiometer) Atmosphere Group develops remote sensing algorithms for deriving sets of atmospheric parameters from MODIS radiance data. These parameters can be integrated into conceptual and predictive global models. MODIS Atmosphere Products Subset Statistics (MAPSS) are generated over important locations around the world, as one of the ways to increase the scope of application of the MODIS atmospheric parameters. This MAPSS data set contains daily time series of the MODIS MOD05_L2 water vapor product over seventeen (17) AERONET sunphotometer measurement sites in southern Africa for the period February 24, 2000, through March 4, 2002. The process of generating the statistics involves identifying these locations on the MODIS MOD05_L2 product, extracting the values of the pixel corresponding to each coordinate point as well as surrounding pixels falling within a 50 x 50 km box centered on the coordinate point. The data product consists of column water-vapor amounts. During the daytime, a near-infrared algorithm is applied over clear land areas of the globe and above clouds over both land and ocean. Over clear ocean areas, water-vapor estimates are provided over the extended glint area. An infrared algorithm for deriving atmospheric profiles is also applied both day and night for Level 2. The data files are stored as ASCII tables in comma-separated-value (.csv) format. There is one file per site per year for each of the following two variables: total column precipitable water vapor (infrared retrieved) and total column precipitable water vapor (near-infrared retrieved).

Documentation

Data set reference document

Citation

Ichoku, C., Y.J. Kaufman, and L.A. Remer. 2005. SAFARI 2000 MAPSS MOD05_L2 Water Vapor Summary Data for Southern Africa. ORNL DAAC, Oak Ridge, Tennessee, USA. http://dx.doi.org/10.3334/ORNLDAAC/815
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Project

SAFARI 2000 (S2K): The SAFARI 2000 project was an international science initiative to study the linkages between land and atmosphere processes in the southern African region. In addition, SAFARI 2000 examined the relationship of biogenic, pyrogenic, and anthropogenic emissions and the consequences of their deposition to the functioning of the biogeophysical and biogeochemical systems of southern Africa. This initiative, which was conducted in 1999-2001, was built around a number of ongoing, already-funded activities by NASA, the international community, and African nations in the southern African region.

Project data set list for SAFARI 2000 (S2K).

Companion Files

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  • ATBD-MOD-03.pdf
  • mapss_modis_watervapor_readme.pdf

Data Files

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Data File (Granule)File SizeDates
mapss_mod05_water_vapor.zip 905.4 KB 2000-02-24 - 2002-03-04

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