unable to access Daymet data

[Michael Rawlins]

Hello,

I have an account on Earthdata and can login. But I'm getting an error when trying to access Daymet data at:

https://daymet.ornl.gov/getdata

I've tried in two different browsers. Please see the attached images of error and login information.

Thank you,

--

Michael A. Rawlins  

Associate Professor

Department of Earth, Geographic, and Climate Sciences

University of Massachusetts, Amherst, MA 01003 USA

maw...@umass.edu | https://blogs.umass.edu/mrawlins

[Earthdata Support]

##- Please type your reply above this line -##

Michael Rawlins,

Thank you for contacting Earthdata Support. This is an automated response confirming the receipt of your request. We will answer your question as quickly as possible. For your records, your request has been assigned the following ticket ID: #111436. When replying via email, please make sure that the ticket ID is kept in the subject line to ensure that your replies are tracked appropriately.

In the meantime, please visit the Earthdata Forum at https://forum.earthdata.nasa.gov/, where you can interact with other users and NASA subject matter experts on a variety of Earth science research and applications topics.

Kind regards,
Earthdata Support

[Z7E539-5W1ZW]

[Miguel Jimenez]

Hi Michael, 

Thanks for reaching out. I have experienced this intermittent issue accessing data too, and the OPeNDAP team is working to fix it. It should be solved shortly, but if you continue experiencing this similar issue let us know...

Miguel Jimenez-Urias, PhD
Computational Oceanographer | Sc. Community Director
OPeNDAP, Inc

https://www.linkedin.com/in/MiguelJimenezUrias/

[Michael Rawlins]

Hello Miguel,

Thanks for the information. I'm now able to login to earthdata, but unable to reach a particular data server. Here is the URL that I'd accessed about a year ago.

https://thredds.daac.ornl.gov/thredds/ncss/grid/daymet-v4-agg/na.ncml/dataset.html

Attached is an image of the page that I'm trying to reach. It allowed me to customize a data download. Also attached is the current error message. 

I'm hoping this will work again soon. I'll reach out again if the problem persists for more than a few days.

Thanks,

Michael  

[Earthdata Support]

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Hello Michael,
 
The Daymet data website is currently under revision. I'm sorry that you haven't been able to access the data.
 
You can find the official home of the Daymet project here on the Earthdata website: https://www.earthdata.nasa.gov/data/projects/daymet
 
Access to the individual datasets is available through the Data and Tools tab at the top of the page. 
 
To download data from the NASA ESDIS archive starting from the dataset landing page, on the left side of the screen you will see a Data At A Glance section where you will be able to click the blue Data Access button to retrieve the data. If you already have an Earthdata account, you will be asked to login before download of the data is complete. If you do not have an account, account creation is very easy.
 
Using the direct download button under data access, or upon selecting a data file from the list through Earthdata Search, you will be taken to the login screen. To the left of the login boxes is a blue button that says Register for a Profile. After filling in the required information you may click the green Continue button at the bottom of the screen.
Once you have created an account, you should be able to begin downloading your data. 
 
Thank you,
Hannah Blanco
ORNL DAAC

Ticket Details
------------------------------------------------------------------------------------------
Ticket ID: 111436
Department: ORNL DAAC
Status: Open

[Z7E539-5W1ZW]

[Michael Rawlins]

Hello,

Please see the attached image. It shows the interface that I've used in the past to subset the data. I'm looking for data over northern Alaska only.

I can not find any similar page/tool/interface to subset the Daymet 1 km daily data. Could you please point me in the right direction? Is OPeNDAP now the tool?

Thank you,

Michael

[Earthdata Support]

##- Please type your reply above this line -##

Michael Rawlins,

Thank you for contacting Earthdata Support. This is an automated response confirming the receipt of your request. We will answer your question as quickly as possible. For your records, your request has been assigned the following ticket ID: #111912. When replying via email, please make sure that the ticket ID is kept in the subject line to ensure that your replies are tracked appropriately.

In the meantime, please visit the Earthdata Forum at https://forum.earthdata.nasa.gov/, where you can interact with other users and NASA subject matter experts on a variety of Earth science research and applications topics.

Kind regards,
Earthdata Support

[006X26-D7WWK]

[Miguel Jimenez]

Hi Michael, 

As the OPeNDAP service is being migrated to a Cloud service, it is causing some disruption to the previous workflows. That involves your previous workflow. Unfortunately my understanding is that, for now, your previous interactive API is no longer available for the Cloud service. As a result, currently, finding OPeNDAP URL, authenticating, subsetting, and downloading data has become more programmatically than before, and on the user side. It clearly has some disadvantages but it also comes with some huge advantages!

I am attaching a link to a static tutorial that demonstrates a subset-driven, parallel download to DAYMET precipitation data from a specific NASA Collection. The tutorial shows how to

- Search and discover OPeNDAP data URLs

- Authenticate with a free Python library called earthaccess.

- Subset by Variable Names and Coordinate Values Lat and Lon min/max values defined by your bounding box. In the tutorial it is precipitation data from the MidAtlantic US.

- Use PyDAP, a free python library developed and maintained by the OPeNDAP group, to stream data in parallel, directly into NetCDF4 files.

- Use Xarray to “open” an aggregated view of all the download files.

Here is a link:

                                          https://www.opendap.org/accessing-daymet-data-from-nasas-archives/

 

For your specific case you will want to identify the Collection Concept ID, or DOI for your data of interest, variables of interest, and subset of interest. In the tutorial, the subset is localized to the MidAtlantic US. You will want to change that to your specific needs (for Alaska). And you will need to have a valid EDL account (best if credentials are in a local .netrc file, but not necessary).

The tutorial also links to an interactive Binder environment where you can test run this and other tutorial notebooks without having to install anything in your machine. Ultimately, if you would like to run and download data into your machine, you can download (clone) the source material following the instructions in the OPeNDAP NASA-tutorials Github Repository linked below:

                                                     https://github.com/OPENDAP/NASA-tutorials

In that cloned directory, will be an environment.yml file to install all required libraries needed to successfully run the tutorials in your machine.

Hope this helps! And do not hesitate to reach out for further questions / concerns

Miguel

---------------------------------------------------------

Miguel Jimenez-Urias, PhD
Computational Oceanographer | Scientific Community Director | Software Dev
OPeNDAP, Inc

https://www.linkedin.com/in/MiguelJimenezUrias/

<image_download.png>

[Thornton, Michele]

Hi Miguel,

Thank you so much!  This is wonderful work and we are very appreciative of these tutorials.

It has been a switch for many of our data consumers to access NASA Earthdata OPeNDAP, so this is very helpful.

Ironically, my colleague Rupesh Shrestha, Cc'd, just developed a similar tutorial to help Micheal Rawlins demonstrating Daymet access with PyDAP:  https://github.com/ornldaac/daymet/blob/main/tutorials/daymet_subset_opendap.ipynb

This is going to be a very important access method not only for Daymet but for many other similar datasets in the NASA Earthdata collections.

Really appreciate you reaching out and sharing this content. We'll be sharing this information broadly with Daymet users.

We look forward to continued collaborations.

Best wishes,

Michele

Michele Thornton

ORNL DAAC Manager

Oak Ridge National Laboratory |  Environmental Sciences Division

ESD | CCSI | DAAC | RSEI

1 Bethel Valley Road, MS 6301

Oak Ridge, TN 37830

Bldg. 4500N, Rm. E140-H

mobile: (865)323-5807 email: thorn...@ornl.gov

https://www.ornl.gov/staff-profile/michele-m-thornton

 

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From: Miguel Jimenez <mjim...@opendap.org>
Sent: Tuesday, March 31, 2026 6:14 PM
To: sup...@opendap.org <sup...@opendap.org>
Cc: Earthdata Support <earthdat...@nasa.gov>; Thornton, Michele <thorn...@ornl.gov>
Subject: Re: [support] [#111436]: [EXTERNAL] unable to access Daymet data