I will do my best to answer some of the questions, but note I am not a met.
Hello guys, 1. The Winds of quickscat/Ascat how they are measured?
Here is a link that goes into some of the detail:
http://winds.jpl.nasa.gov/aboutscatterometry/2. Those indicated are the maximum sustained winds or medium sustained winds?
The winds could be considered maximum or medium. If there are only one or two 50 knot flags, for example, then the intensity is probably close to 50 knots. If there are many 50 knot flags, though, then it is possible 55 knot or 60 knot winds are occurring in a smaller area that the satellite did not sample. Note: The flags that are black are considered rain contaminated and they are not valid. Rain can really inflate the values, making a weak storm look a lot stronger than it really is. Another thing I am not sure about is shallow water. I know shallow water throws the SFMR off
3. Maximum flags, give intensity 'of the storm??
Max barbs/flags are generally close to the intensity, except in hurricanes. The strong winds occur in such small areas, the satellite has a hard time picking them up (like in the eyewall). I've seen a 140 knot hurricane only have 110 knot barbs (characterized by two 50 knot flags and a 10 knot barb). See the note above regarding rain contamination.
4. If the flag is 50 kt, means that the storm is 50 kt? or must be many flags of 50 kt in a 50 kt storm?
This depends on the size of particular storm and how things have been going, in relation to other observations (especially recon). Usually, though, if there are a couple 50 knot flags, the maximum intensity is around 50 knots. Smaller storms are harder to accurately scan with the satellite, and it may miss the strongest winds...especially if they are occurring over a small area. Larger storms can be easier, but in all it is best to have multiple data sets available to look at. If there are many 50 knot flags, the intensity is likely a little higher than 50 knots.
I would like answers to my questions, please