Greening and browning of Greek cities using pixel dichotomy on Landsat data cubes

The role of green spaces in sustaining a good quality of life for urban dwellers has been widely appreciated. Earth observation has reached a next level in terms of deep time-series and unprecedented processing means, in order to monitor the actual quality of vegetation, in green spaces, for large regions. We exploit satellite big data to estimate NDVI and then convert it to vegetation percentage, for the largest urban areas of Greece, using the pixel dichotomy method, for the past two decades. Interesting trends appear in the results, both in terms of the overall change of vegetation and in the spatial distribution of greening and browning areas.