I have calculated the NDVI of a city. Now I want to know how "green" every street segment in that city is. I therefore buffered 7.5m on every street segment. I then used the Zonal Statistics as a Table-tool, in order to get the statistical values for every buffered street segment. My workflow is therefore:
- Calculate the NDVI and save it as .tif-file.
- Buffer the street segments using a 7.5m buffer.
- Use Zonal Statistics as a table to get the statistics of every polygon (the input polygons are the buffered street segments).
However when I look at my resulting statistical table, I see that I cannot use it. I thought about using the mean (with the idea of the "mean greenness of a street") but sadly I have there values out of the [-1,1] range of the NDVI (1,05 and 534,97 to be exact). The thing is also that I cannot explain that value 534,97, since in that polygon is not that much green.
Is there another way/approach to determine how "green" a city is?