Add option to use latest GDAS profile instead of standard atmopshere

[HolgerPollyNet]

It would be nice, to add the option that the latest available GDAS profile for a site is used in the NRT processing instead of standard atmosphere.

This option should not prevent the reprocessing during the night once GDAS profiles for the time of the measurement are available.

[ZPYin]

There is a keyword meteorDataSource to configure the meteorological data source for Picasso (see below). https://github.com/PollyNET/Pollynet_Processing_Chain/blob/456285034326bcf8f7f4002a1c4fcb864d08b009/config/pollyConfigs/polly_global_config.json#L83

So far, there are four options for meteorological data source:

• gdas1
• standard_atmosphere
• websonde (from wyoming site)
• radiosonde (from site launching)

If I remember correctly, the latest GDAS profiles have a latency of 1 day (at least). Therefore, Picasso will turn to standard atmosphere during NRT processing, since no GDAS profiles can be found in the server.

[HolgerPollyNet]

@ZPYin thanks for explaining the current procedure, however, this issue was intent to add one more option, namely the use of the latest available GDAS profile instead of using standard atmosphere for preliminary processing.

[ZPYin]

@ZPYin thanks for explaining the current procedure, however, this issue was intent to add one more option, namely the use of the latest available GDAS profile instead of using standard atmosphere for preliminary processing.

OK, it can be implemented. But it's time consuming to search the exact latest available GDAS, since you need to iterate the entire GDAS file tree. As an alternative, I decided to search the past 2-month for the "latest" profile. You can find the implementation in the commit id above this post.