NWIS - not all data at a site is retrieved? Any insight?

[Emily Baker]

Hello Ulmo developers,

Thank you for making such a great package - perhaps soon I will be skilled enough to help contribute to its development.

I'm wondering if you can provide any insight. For a given USGS NWIS site, a query may not return all variables that are shown on the NWIS web page.

For example, below temperature is shown on the NWIS web interface, but is not retrieved by nwis.get_site_data().

Any insight for me? Many thanks!

The query:

siteno='15478038'

site_data=ulmo.usgs.nwis.get_site_data(siteno, service="daily", period="all", methods='all')

[Dharhas Pothina]

That site is showing only 3 parameters available if I visit the web url:

https://waterdata.usgs.gov/nwis/dv?referred_module=sw&site_no=15478038

I'm not sure why your screenshot doesn't match the link above...

- dharhas

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[Dharhas Pothina]

great. glad to help.

- d

On Fri, Feb 9, 2018 at 4:43 PM Emily Baker <emily.hew...@gmail.com> wrote:

Hi Dharhas,

Thanks so much for your reply.

I'm at the USGS on our network, which gives me access to an "unverified" and not publicly accessible version of the data via my web browser. Thus, my confusion on # of available variables. Resolved my problem over on the NWIS database side with the water team here.

Many thanks,

Emily

[Emilio Mayorga]

Hi Emily (and Dharhas),

Actually ... your ulmo nwis request attempt uses the argument service="daily", but your screenshot had a "uv" in the URL, which as I understand it stands for "unit values" (or "unverified"?), which is basically the instantaneous data.

See these two listings, daily vs uv:

https://waterdata.usgs.gov/nwis/dv?site_no=15478038

https://waterdata.usgs.gov/nwis/uv?site_no=15478038

The ulmo nwis service also supports requests for instantaneous data, via the argument service="instantaneous" (or "iv"). I tried the same request with service="iv", and I got back all the parameters on your screenshot.

See the ulmo nwis service documentation:
http://ulmo.readthedocs.io/en/latest/api.html#module-ulmo.usgs.nwis

SO: ulmo does provide access to the data and parameters you're looking for. You just have the select the right service (iv/instantaneous).

Cheers,

-Emilio

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