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request for IMERGv7 daily (GPM_3IMERGDF) #5

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joaquin-unsw opened this issue Aug 7, 2024 · 0 comments
Open

request for IMERGv7 daily (GPM_3IMERGDF) #5

joaquin-unsw opened this issue Aug 7, 2024 · 0 comments

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@joaquin-unsw
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Hello,

I am working with daily precipitation over high-latitudes.

I saw the expansions of FROGS under ia39, including IMERGv7. However, the entire FROGS database only contains rain, not snow.

The project ia39 hosts IMERGV7 in high spatial resolution and with snow probability, the problem is that it comes at super high temporal resolution (30min). Since I am working with ~15 year climatology I will most likely compute and save daily data as intermediate steps. Other researchers may have similar needs.

Additionally, I am not sure whether computing daily averages will get the same as the daily product (GPM_3IMERGDF): it seems there is some quality control in the latter case. From sample files that I downloaded from NASA I could see that there are additional variables:
Count of all valid half-hourly precipitation retrievals for the day
Count of half-hourly precipitation retrievals for the day where precipitation is at least 0.01 mm/hr
Count of all valid half-hourly MWprecipitation retrievals for the day
Count of valid half-hourly randomError retrievals for the day

Thanks,
Joaquin

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