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Prerequisites: A user must register with Earthdata Login and be authorized to access data at GES DISC. Please read more by clicking GES DISC data-access. 1) Obtain a HDF5 data file via online archive https://gpm1.gesdisc.eosdis.nasa.gov/data/GPM_L2/ For example, https://gpm1.gesdisc.eosdis.nasa.gov/...

Yes, the document can be found here,

https://docserver.gesdisc.eosdis.nasa.g ... sition.pdf

We discourage downloading large datasets such as TMPA in ASCII format. The download will likely be much slower and may take much more network bandwidth, and storage, especially for large subset regions. All TMPA files at GES DISC are internally compressed, which is seamless to the user, and thus the...

The projection used is, geographically, the Equirectangular projection, and the datum is WGS84.

When import the data into GIS software (e.g., ArcGIS, Erdas/Imagine, ENVI), select the global WGS84 "Geograhic" coordinate system as spatial reference/projection info.