Current PSD (Web/Data Status). PSD has undergone major URL restructuring so that all URLs start with http://www.esrl.noaa.gov/psd/ (More Info).
Number of Observations (5-day totals)
The number of observations images indicate the total number of pixel observations included within a 0.5 by 0.5 degree lat/lon bin. The individual pixel observations are approximately 25 km apart so for a bin at the equator there are between 5 and 10 pixels with each bin for a given overpass. The total number of observations is then a function of the number of pixels within a 0.5 by 0.5 degree bin, the number of overpasses per observation period by a given satellite, and the number of satellites. Some regions such as coastlines and areas with sea ice have fewer observations because those observations are masked out and not counted in the resulting satellite estimate.
| SSM/I | |
| SSM/T2 | |
| GOES day and night combined | |
| GOES day only | |
| GOES night only | |