Minimize ALOS PALSAR On-The-Fly FAQ

What is the ALOS PASLAR On the fly Service?

The ALOS PALSAR On-The-Fly processing and dissemination system allows direct access to ESA's archive from ALOS PALSAR.

Products can be discovered online from:

  • A geographical catalogue with metadata search
  • A folder tree organised by track and frame
  • A filename based filtering

Once a user requests a product download, the product is downloaded immediately if the system has the product in cache, or the product is downloaded after the processing is completed.

How do I access the ALOS PALSAR On-The-Fly service?

You should freely subscribe to ALOS PALSAR ESA data products. Please subscribe to ALOS PALSAR by clicking the Get Data in the product description page.

If you do not have a EO-SSO account on Earth Online, you will be requested to create an account following the registration instructions.

Data are accessible through the ALOS PALSAR On-The-Fly web interface.

For any additional inquiries please contact

How do I download a product?

Please refer to the user manual.

What are the restrictions on the number of downloaded products per day?

Standard users are given a quota of 20 products per day.

How can I get a higher daily number of downloads?

For a quota increase, please submit a request to Once approved by ESA, you will be assigned a new daily quota satisfying your request.

What are the limits on the system performance?

The major constraint on performance is the user's own internet connection, which limits the speed that a product can be downloaded. If you are experiencing issues, try reducing the number of products ordered at one time.

What do the error messages that I see mean?

"You have already downloaded your granted number of products for today"

You have reached your daily limit (see above), you will need to wait until the next day.

The system is currently serving the granted requests of other users, and has reached the total number of parallel downloads

The number of concurrent users has exceeded the capacity of the system to download products. Please try resubmitting again later in the day.

Product unavailable

The system has not been able to produce the requested product due to an unexpected error. If you still require this product, please contact directly.

Resource couldn't be accessed / Internal server error / Java exception / Operation timed out

These error messages usually mean a temporary connection error or system outage. Try resubmitting the request again after a few minutes. If it still doesn't work, please contact

Forbidden: Please sign the terms and conditions

You do not have access to the collection. Please see "How do I access the ALOS PALSAR On-The-Fly service?" section above to access the products.

There was a problem while handling your request. Please send an email to the Administrator, including the following problem code: [...]

Please contact providing your EO-SSO ID, First name, Last Name, Institution & Country of residence and problem code.


What quality issues apply to the data?

Please refer to the product disclaimer page.

ESA Toolbox for ALOS PALSAR Products

The official ESA Toolbox for ALOS PALSAR products is "Sentinel Application Platform" (SNAP). Please refer to the ALOS PALSAR SNAP plugin disclaimer.

How do I get further assistance?

Please consult the user manual. If this does not answer your question, please contact