I need some ground measured green vegetation fraction data for validation purpose. I searched online and find other vegetation measurements, such as LAI, FPAR and GPP. But no green vegetation fraction data available.
I was thinking to use PhenoCam images to derive green vegetation fraction. Those images are taken from towers at a off-nadir view angles, which is unkown. Since vegetation fraction is dependent on view angles, it is difficult to derive vegetation fraction without view angles.
Dear Zhangyan,
Could you sharpen your question?
First of all, I assume you are looking for data on "fractional vegetation cover (FVC)" over land, which is a somewhat ill-defined concept, because it is highly dependent on spatial scale and resolution. Hence you should indicate what overall area you wish to cover, and how much spatial detail you need to have.
Second, you should specify the level of accuracy required. Specifically: What is the largest uncertainty in FVC you can tolerate? Without such a constraint, any answer will be acceptable.
Third, what exactly do you want to "validate"?
Satellite remote sensing techniques may be useful for your problem, but the specifics will depend on your answers to those questions.
Best regards, Michel.
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