[atlas] Satellite based "last mile" and Atlas probes

Hello,

I'm really happy to see real community help here! :-) A few extra words 
from my perspective:

>> Is anyone aware of a list of probe ID numbers which are definitively 
>> known to be on some form of satellite-based access technology? I am 
>> thinking of, for instance, sites on consumer grade geostationary VSATs, 
>> more serious VSATs, or in island nations which are not known to have any 
>> submarine cables.

We encourage hosts to tag their probes with whatever they find useful to 
share. I consider the connection type as one such useful attribute. Not 
everyone does this but indeed as Grzegorz says:

> https://atlas.ripe.net//api/v2/probes/?tags=Satellite 
> https://atlas.ripe.net//api/v2/probes/?tags=VSAT 

This is what hosts already did. The list is likely not complete, and may 
contain false positives.

> Funny thing is that 'VSAT' is not visible in 
> https://atlas.ripe.net/api/v2/probes/tags/ 

I can explain this: all user-assigned tags start their lives on one 
probe. Some tags are not likely to be ever used by multiple hosts (eg. 
"email_[address]_for_questions"), others become popular and are used on 
multiple probes. We periodically "approve" the ones that look like they 
are common, so they publicly pop up in various places, eg. the one you 
point to above. I just approved the VSAT tag.

> This gives you the list of probes that have a last-mile median RTT (endpoint_type=LM&median__gte=495) higher than 495ms:
> https://ihr.iijlab.net/ihr/api/network_delay/?timebin=2021-04-21T00%3A15&endpoint_type=LM&median__gte=495

I suspect Stephen will soon offer a self-service alternative using 
BigQuery any minute now :-)

Cheers,
Robert