ndvi and evi opendap down

[Jentsch, Marcel]

Dear Colleagues,

 

the data access to MODIS/Terra Vegetation Indices 16-Day L3 Global 250m SIN Grid V061 and MODIS/Terra Vegetation Indices Monthly L3 Global 1km SIN Grid V061 via opendap data is down. Will this service be up and running again.

Kind regards,

Dr. Marcel Jentsch

[Miguel Jimenez]

Hi Dr. Jentsch, 

I have also noticed that several MODIS endpoints are no longer available, for some time now. I was informed that this is part of a a planned migration from NASA, in particular migrating the opendap service (Hyrax) to the cloud. I do not know the timeline right, but hopefully these will be restored soon.

As the opendap service migrates to the cloud, the dap protocols (DAP2/ DAP4) will remain the same, but the OPeNDAP url associated with each granule will change. For opendap's cloud services, you will eventually see a granule url of the form:

https://opendap.earthdata.nasa.gov/collections/<insert_collection_concept_id>/granules/<insert_granule_id>

With both collection concept_id and granule_id  a specific to the dataset/ and file. These two are discoverable via many NASA services like EarthdataSearch, and programmatically from the CMR API . Pydap, a python client library can be used to query the CMR to find OPeNDAP URLs, with knowledge of the collection concept ID and other relevant filters like dates of bounding boxes to narrow the results. See this notebook for example:

https://github.com/OPENDAP/NASA-tutorials/blob/main/binder/CMR_queries.ipynb 

The root repository https://github.com/OPENDAP/NASA-tutorials  can also be run on an interactive binder environment by clicking the launch / binder batch at the top of the README text, and has are some additional examples describing other use cases that may be relevant.

We are in the process of updating the resources that describe best practices with OPeNDAP, in particular those will be in Pydap’s Documentation, and OPeNDAP’s NASA-tutorials GitHub repository.

Thank you for reaching out.

Kind Regards,

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

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