this resource comes from a zip archive with a several shape files that show the normalized vegetation index (NDVI) in the different areas (sidewalks, islets, parcels, planning and sub avenues).
Original source
here
The data is collected in Spring 2018.

• ndvi_sidewalks_islets.zip (47Mb)
  description: normalized vegetation index (NDVI) for the sidewalks, and islets of Madrid
  
• ndvi_parcels.zip 42Mb)
  description: normalized vegetation index (NDVI) for the parcels of Madrid
• ndvi_sub avenues.zip (35Mb)
  description: normalized vegetation index (NDVI) for the sub avenues of Madrid
  https://geoportal.madrid.es/IDEAM_WBGEOPORTAL/dataset.iam?id=c02e181e-6d78-11e9-a351-40a8f0462086

All the files are in geojson format projected in WGS84 - epsg:4326

The data is open data and is licensed under these conditions

The general conditions allow the reuse of data for commercial and non-commercial purposes. You have to cite the origin of the data as Madrid City Council and not suggest the Madrid City Council supports your work

Please read the complete license here in particular the section relative to the *Condiciones generales para la reutilización*