Categories » BEAM Extensions » RE: Some question about SMOS BOX usage under Beam’s circumstance
Combination View Flat View Tree View
Threads [ Previous | Next ]
RE: Some question about SMOS BOX usage under Beam’s circumstance
Some question about SMOS BOX usage under Beam’s circumstance
6/14/12 3:08 AM
I have installed BEAM and SOMS BOX.I want to show the salinity of China Sea

1. what does the max walue stand for?
when i import the Level 2 ocean salinity product into BEAM and click to show a color manipulation ,i find the maximum scale value in the color bar is 40，but in the higher place in this dialog box, here also have a max value 169.919psu, Is that possible? As I know the salinity in water cannot higher than 40.So please tell me what does this value stand for?

2. How to get the water salinity value when I know the latitude and longitude of one place using smos box under Beam’s circumstance?
PS:I have imported the Level 2 ocean salinity product into BEAM, and I used to put a pin in the image ,then load the value of SSS1,I find the value is abnormal when compare with the in-suit data.
Attachments: questions.doc (1,245.5k)
Flag Flag
RE: Some question about SMOS BOX usage under Beam’s circumstance
6/14/12 6:14 PM as a reply to Yuli Chen.
Dear Yuli Chen,

Quick answer for your point 2: Just add a pin, the open the pin manager (the icon with the pin plus a manager-kind-of-guy), select your pin in the table. Double-clicking cells in the 'Lat' or 'Lon' columns let you edit the lat/lon coordinate of a pin. It will then ju7mp to that position in the image view.

In the pixel view, you can then select "snap to selected pin" in order to display all pixel values there. If you only see the value of the currently open view, then go into the VISAT preferences dialog, entry "UI Behaviour" and select "show pixels of all bands". Using the pin manager you can also export all data under selected pins to a text file.

Regarding yor point 1, we have to investigate a bit in order to reproduce what's going on.

Regards
Norman
Flag Flag
RE: Some question about SMOS BOX usage under Beam’s circumstance
6/15/12 4:04 AM as a reply to Norman Fomferra.
Thank you so much for your help.
Here is my another question ,i try your ways to add a pin then i get the value of SSS1,finding that the value is abnormal when compared with
in-site SSS data,some crazy value can reach to 100+(possible?)
couid you help me solve this problem?
thank you in advance.
Flag Flag
RE: Some question about SMOS BOX usage under Beam’s circumstance
6/15/12 10:51 AM as a reply to Yuli Chen.
Would you mind asking the people that provided you with the data? I do not know details about the contents of the product data and how it was calculated so I cannot explain the abnormal salinity values.

As usual for scientific measurement datasets, all of the SMOS data cells have additional flag values for each measurement cell. These may give you some deeper insights about the quality of the SSS-data for a specific cell. The descriptions for the flags can be found in the SMOS Level 2 File Format Specification that is available at: http://calvalportal.ceos.org/cvp/web/guest/smos-calibration

To visualize the flags in Visat, select the "Pixel Info" view and switch the button "Show/Hide Flags" to "on" (the rightmost with an "F" on it). The Flags-Window displays all flag values for the pixel under the mouse-cursor. In a test-product, I also found easily SSS values far above 100 - but a lot of flags have been raised for these pixels. This may help you in interpreting the measurement value.
Flag Flag

 

Welcome to the BEAM Forum!

We encourage you to sign in our forum and participate in the BEAM community. The forum is maintained by the BEAM project team who will most likely answer your questions within 24 hours (except during common holidays) - if not done by other community members. Collaborate, share your knowledge and learn from other users!

If you don't find what you are looking for, please also consider the following external forums: