Help with Downloading Daymet Data

[Fun_2_Bike]

Hello,

I just retired from the US Forest Service, Rocky Mountain Research Station, and I'm volunteering on a project that we have ongoing.  In Jan, I was able to download SWE data from the Daymet site, and now I can't find a way to get the data.  All of the links are deadends.  I'm trying to find the netcdfSubset link.  This image was from my notes from Jan 2025.  Are these data still available?

Thanks!

Dona Horan

USFS Boise ID

[Miguel Jimenez]

Hi Dona Horan, 

Thanks for reaching out. What you and other of OPeNDAP users are experiencing is related to a migration to cloud hosted services by NASA. This, unfortunately results in dead links, which is out of our control (there should be a redirect...).  As data is moved to the cloud, the OPeNDAP urls get updated to have the following format (note while data may be in the cloud, users can continue to access and download data from their personal computer):

  https://opendap.earthdata.nasa.gov/collections/<CollectionConceptID>/granules/<GranuleUri>

Where:

<CollectionConceptID> ——>  Data product you are interested in, for example DAYMET has a CollectionConcept ID  that is unique.

<GranuleUri>     ——>  File Identifier.

How does this apply to your data of interest?

So for example, for DAYMET V4 (daily) data you have:

<CollectionConceptID> = C2532426483-ORNL_CLOUD

<GranuleUri> =Daymet_Daily_V4R1.daymet_v4_daily_na_tmin_2024.nc # an example

These result in the following example cloud OPeNDAP URL:

https://opendap.earthdata.nasa.gov/collections/C2532426483-ORNL_CLOUD/granules/Daymet_Daily_V4R1.daymet_v4_daily_na_tmin_2024.nc

To look at the OPeNDAP data access form, you can take the above url and append:

•  .dmr extension and paste it into a browser (DAP4 data access form). For example: https://opendap.earthdata.nasa.gov/collections/C2532426483-ORNL_CLOUD/granules/Daymet_Daily_V4R1.daymet_v4_daily_na_tmin_2024.nc.dmr

• .html extension and paste it into a browser (DAP2 data access form). For example: https://opendap.earthdata.nasa.gov/collections/C2532426483-ORNL_CLOUD/granules/Daymet_Daily_V4R1.daymet_v4_daily_na_tmin_2024.nc.html

You can discover as many OPeNDAP urls available from the Earthdata Search page, or our recommended approach is to use Python, in particular PyDAP (an open source software we help maintain). You can see an example in the following free resource for finding 100s of OPeNDAP urls:

 https://pydap.github.io/pydap/en/notebooks/GetCMRURLS.html#discoverying-daily-4km-cholophyll-data-from-pace-level-3 

Hope this helps, and do reach out if you continue to experience issues accessing data.

Miguel Jimenez