[ldm-users] ASOS Surface Obs + METAR/SPECI

Hello all, 
I’m trying to identify the fastest practical path to ingest US ASOS/METAR 
observations into an LDM-based pipeline (near-real-time use case). I’m looking 
to build a model detailing the urban heat effect and how it impacts weather. 

For lowest latency ASOS/METAR into LDM, what upstream are you using now 
(NOAAPort/SBN, MADIS LDM, other)?
If using LDM, which feedtypes/product identifiers are most reliable for 
high-frequency surface obs?
Typical observed end-to-end lag (obs time → local ingest) for your setup?
Any recommended filtering/decoding approach for 1-min style obs vs standard 
METAR/SPECI?
Is the `tgftp.nws.noaa.gov/SL.us008001/DF.bf/DC.intl/` spool useful for 
low-latency operational ingest, or mostly bulk/archive?

Any pointers or insight would be greatly appreciated here. 

Thank you all! 
Blake Dalman