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Python script example for LAADS DAAC data download can be found at:
https://ladsweb.modaps.eosdis.nasa.gov/tools-and-services/data-download-scripts/#python

You are getting this error probably because you are not logged in to NRT system. So, to download your files: - Open a tab on your browser then go to: https://nrt3.modaps.eosdis.nasa.gov/ and, log in under profile using Earthdata credential (UN and PW). Then go back to the website you were download t...

Can you please specify how you are download data, which URL?

Good to know that you were able to resolve the issue. A science member mentioned this GDAL utility to change the format of the MCD19 (MODIS) products to a tiff:
https://www.igismap.com/convert-hdf5-to-geotiff/

Hi Hanzhi:
Sorry for the delay in response. Can you please explain your question "... impact of this difference from two source of MODIS geolocation files will be for other MODIS products.", which other MODIS products, from LAADS or from OB DAAC?

Dear Colin,
We don't have resources to help you with GDAL however you can explore HDF-EOS TOOLS AND INFORMATION CENTER website (http://hdfeos.org/index.php) for information and examples about HDF-EOS and about tools available to view or work with HDF-EOS and other NASA HDF files.

No, these tokens do not expire.

Dear Simon: Are you using Earthdata Login token or LAADSWeb login token in your download script Authorization header? Earthdata login tokens will not work with any of our sites. You need to use a LAADSWeb token when you send the Authorization headers in your scripts. We are working with Earthdata to...

The data download issue is fixed so you should be able to download data now.
For all LAADS DAAC news and alerts visit:
https://ladsweb.modaps.eosdis.nasa.gov/ (see alerts at the bottom of the page)

Yes, this is a known issue and our web team is looking into it. Hopefully this issue will be resolved soon.