Reading envisat raw data

Is it possible to open/read Envisat raw images (ASA_IM__…N1) by SNAP?
Please inform me on this possibility.
Morteza

Yes it is possible.

ASA_IMG_1P - Image Mode Ellipsoid Geocoded Image
ASA_IMM_1P - Image Mode Medium Resolution Image
ASA_IMP_1P - Image Mode Precision Image
ASA_IMS_1P - ASAR Image Mode Single Look Complex
ASA_IM__BP - Image Mode Browse Product

Are all supported.

Thank you for fast reply.
In opening the ASA_IM__…N1 image, I receive below error:

Could you click on “Show Details” and post what’s shown there.
Also the mentioned file ‘messages.log’ would be interesting.

the detail is:
java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.io.BufferedInputStream.fill(Unknown Source)
at java.io.BufferedInputStream.read1(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source)
at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.doTunneling(Unknown Source)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.access$200(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessController.doPrivilegedWithCombiner(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at java.net.HttpURLConnection.getResponseCode(Unknown Source)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(Unknown Source)
at gov.nasa.worldwind.retrieve.HTTPRetriever.doRead(HTTPRetriever.java:48)
at gov.nasa.worldwind.retrieve.URLRetriever.read(URLRetriever.java:368)
at gov.nasa.worldwind.retrieve.URLRetriever.call(URLRetriever.java:244)
at gov.nasa.worldwind.retrieve.URLRetriever.call(URLRetriever.java:27)
[catch] at gov.nasa.worldwind.util.SessionCacheUtils.retrieveSessionData(SessionCacheUtils.java:80)
at gov.nasa.worldwind.util.SessionCacheUtils.getOrRetrieveSessionCapabilities(SessionCacheUtils.java:170)
at gov.nasa.worldwind.terrain.BasicElevationModel.retrieveResources(BasicElevationModel.java:2028)
at gov.nasa.worldwind.terrain.BasicElevationModel$3.run(BasicElevationModel.java:2118)
at java.lang.Thread.run(Unknown Source)

and log file is :
messages.log (95.8 KB)

The interesting part was in the messages.log file.

DDDB resource not found: missing file: /org/esa/snap/resources/dddb/products/ASA_IM__0P.dd

You are trying to open a level 0 product. This is not supported.
Only from level 1 upwards.

thank you for reply.

my first question was about raw data or level 0.
by the way , thank you.

Dear all,

sorry for the old topic,

however, the availability envisat data in my area of interest is ASA_IM_0P (raw data, level 0)
how to level up to SLC (level 1.1)

Thank you

What kind of page is this?

You can download Envisat ASA SLC products with EOLISA
https://earth.esa.int/web/guest/eoli

Edit: EOLISA was replaced by the online dissemination: https://esar-ds.eo.esa.int/oads/access/

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Thank you for your quick response ABraun
the page is:
http://eo-virtual-archive4.esa.int/

I already downloaded and installed eoli-sa, login as EO-SSO account (my name) but still can not download envisat data.
Or I have to submit as fast registration for requesting Level 1 data, (have to wait response for 2 days).
Your help is very appreciated

jefri

SNAP does not support L0 (unfocused) SAR data. If people are using some open source SAR processor for focusing we could support reading that data back into SNAP.

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yes, you have to await your fast registration approval before you can download from EOLISA.

1 Like

Dear mengdalh,
sorry to use this old topic but I’m wondering if you have found some open source SAR processor for focusing. I’m working with RAW data and I would like to learn how decoding this type of data.
Thank you in advance.

S. Savastano

Hello Abraun. Is ENVISAT ASAR data available for download now? I saw the message below.


yes, EOLISA was replaced by the “Online Dissemination” which might be temporarily unavailable but it is the correct site to search and download ENVISAT data.

You can register and create a login in the meantime (if you do not have one yet).

Okay thank you. I understand.