NASA Water Vapor Project

Project Description
STC-METSAT (a division of Science and Technology Corporation) has
produced under a NASA sponsored research grant, a blended analysis of
global water vapor. This product combines retreivals of precipitable
water (or water vapor) from ground-based radiosondes, in microwave
frequencies from the Special Sensor Microwave/Imager (SSM/I), and
infrared TOVS observations from the NOAA operational series of
satellites.
The NVAP data-set consists of global grids of 1x1 degree resolution
with daily, pentad and monthly averages. The data-set spans 5 years
from 1988 - 1992. Information on this data set may be obtained from:
http://www.stcnet.com/projects/nvap.html
The data (formally available from the Marshall Space Flight Center
DAAC) is now be available from the EOSDIS NASA Langley Distributed
Active Archive Center (DAAC).
http://eosweb.larc.nasa.gov/