[Datastream #SWJ-684609]: Accessing NEXRAD Level 3 data

Greetings,

Thank you for writing in, sorry to hear about the trouble accessing the Level 3 
data.

After consulting a colleague we found that S3 bucket should work despite the 
data not showing up when you click the bucket link; this is something of a 
known issue.  But we've been able to verify that data is actually there.  
Here's some Python code that helps confirm this:

import boto3
import botocore
from botocore.client import Config
s3 = boto3.resource('s3', config=Config(signature_version=botocore.UNSIGNED, 
user_agent_extra='Resource'))
bucket = s3.Bucket('unidata-nexrad-level3')
ret = bucket.meta.client.list_objects(Bucket='unidata-nexrad-level3', 
Prefix='INX_NVW_2022_10_03_', Delimiter='_')
print([p['Prefix'] for p in ret['CommonPrefixes']])

    ['INX_NVW_2022_10_03_00_', 'INX_NVW_2022_10_03_01_', 
'INX_NVW_2022_10_03_02_', ...]


If you're still not able to use that S3 bucket in your workflow please let us 
know.

I'll add there are other ways to find Nexrad Level 3 data:  We also offer a 
THREDDS server where this data is available (links below), and that can be 
remotely accessed using our Siphon package. And I know you said you're not 
looking to download the data directly, but there is also the NCEI database from 
NOAA which hosts a REST API you might be able to utilize.  And while I suspect 
this may not be what you're looking for, if you're interested in more of a push 
service for real-time data we can talk about installing LDM to have that data 
delivered to you, but this is a more involved way of doing things at least in 
terms of installation & setup.

Our Nexrad L3 THREDDS catalog:
https://thredds.ucar.edu/thredds/catalog/nexrad/level3/catalog.html

NCEI's Nexrad L3 page:
https://www.ncei.noaa.gov/access/metadata/landing-page/bin/iso?id=gov.noaa.ncdc:C00708

Info about the Siphon Python package:
https://www.unidata.ucar.edu/software/siphon/

Info about our LDM software:
https://www.unidata.ucar.edu/software/ldm/


I hope this helps, please let us know if you have any other questions.

Best,
-Mike



> Hello,
> 
> I am a graduate student currently accessing NEXRAD Level 2 data through
> AWS. I was hoping to get hold of Level 3 data instead. In AWS, there is a
> bucket for Level 3 but with no data in it. I see how to download Level 3
> data on the NOAA/Unidata sites, but I don't want to download. I would like
> to remotely access Level 3 data similar to how I access Level 2 data. Is
> there a way to do this? Storing large amounts of data locally is currently
> inconvenient for my work.
> 
> Thank you,

Ticket Details
===================
Ticket ID: SWJ-684609
Department: Support Datastream
Priority: Normal
Status: Closed
===================
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