Hello Everyone!
I am a beginner, and I am trying to explore the possibility of estimating surface albedo using PlanetScope data. Since there are several established relationships between the visible and NIR bands from Landsat 8 and Sentinel-2, I was wondering if anyone has explored the use of PlanetScope data for surface albedo estimation.
Can we use the visible and NIR bands from PlanetScope data to estimate surface albedo?
I would really appreciate any help or insights.
Best answer by elyhienrich
If you are referring to albedo as another term for surface reflectance, you can use an analytic_sr asset product, and then divide the values by 10,000 to cover back to a 0-1 range.
However, technically, surface reflectance refers to reflectance from a single angle, like the satellite acquires. Albedo can be defined as the average reflectance over all angles.
Therefore, you need to know the full angular distribution of reflectance (i.e. BRDF) to get albedo. There's no easy way to measure the angular distribution from satellite. You’ll need to make lots of assumptions about the area/landcover you’re working with to get true albedo from surface reflectance.
Here is an article that uses Sentinel-2 to do similar calculations: Albedo Retrieval From Sentinel-2 by New Narrow-to-Broadband Conversion Coefficients
+15If you are referring to albedo as another term for surface reflectance, you can use an analytic_sr asset product, and then divide the values by 10,000 to cover back to a 0-1 range.
However, technically, surface reflectance refers to reflectance from a single angle, like the satellite acquires. Albedo can be defined as the average reflectance over all angles.
Therefore, you need to know the full angular distribution of reflectance (i.e. BRDF) to get albedo. There's no easy way to measure the angular distribution from satellite. You’ll need to make lots of assumptions about the area/landcover you’re working with to get true albedo from surface reflectance.
Here is an article that uses Sentinel-2 to do similar calculations: Albedo Retrieval From Sentinel-2 by New Narrow-to-Broadband Conversion Coefficients
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