It is said to be a successor of TRMM. I want to know about certain advantages and uncertainties of using GPM datasets for tracking monsoons and Cyclones.
TRMM observes global tropics between 35° S to 35°N latitudes while GPM observes global region between 65° S to 65°N latitudes.
GPM’s orbit, hence the datasets (unlike TRMM’s) will enable observation (tracking) of tropical cyclones as they progress from tropical to mid-latitude systems.
TRMM sampling frequency is 15 hours to 4 days at any point which introduces substantial uncertainties in rain estimates. GPM constellation satellites have revisit times of 1-2 hours over land.
GPM has higher sensitivity to light rain and snow compared to TRMM-PR.
GPM is the best we yet have... think IMERG.
Dear Arun,
Global Precipitation Measurement or GPM is a program of several space agencies led by the US space agency NASA whose objective is to make periodic measurements of precipitation close to the level of the entire planet. This program is a continuation of the mission Tropical Rainfall Measuring Mission with broader objectives. Several satellites must collect data whose consistency will be ensured by the GPM Core Observatory satellite developed by NASA with an important participation of the Japanese space agency JAXA. The data collected by the GPM satellite fleet should improve the daily weather forecasts, better prevention of natural disasters related to flooding or droughts, and for the long term, help improve modeling of change climate. GPM Core Observatory is a satellite of 3.2 tonnes which carries two instruments developed especially: a dual frequency radar and a radiometer.
GPM extends the scope of observations in low-intensity rainfall (up to 0.5 mm per hour) and the snow, which predominate at mid and high latitudes. This capability required the premise developing appropriate instruments.
The Global Precipitation Measurement program aims to measure precipitation globally and is implementing several satellites. It is based on the implementation of a central satellite (GPM Core Observatory) carrying a radiometer and radar to measure rainfall from space and serve as a reference to unify the measurements made by the other spacecraft attached in the program.
With my best regards
Prof. Bachir ACHOUR
Dear Arun,
You will find in the following link, how to access the GPM data.
http://pmm.nasa.gov/data-access
With my best regards
Prof. Bachir ACHOUR
The thing is i have selected IMERG-GPM in ASCII format. In that I don't know which are the parameters to be used. Please help me selecting the precipitation information out of all parameters given.
The GPM-IMERG data formats are usually in HDF, NetCDF, and TIFF... i don't know of the ASCII format. How did you arrive at ASCII format? Perhaps, if you could upload your ASCII data here, i could be of help.
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