Greenness (NDVI)
Normalized Difference Vegetation Index (NDVI) measures the quantity of green vegetation in a spatial region. Experiencing green spaces has many health benefits, including increasing physical activity and improving mental health, as well as improving air quality and mitigating the urban heat island effect.
Walkability
Walkability measures how well the design of a neighborhood enables pedestrian mobility. When daily errands (e.g., school, work, transit) are walkable, it encourages us to be physically active and reduces our reliance on cars; thereby improving our physical health and reducing air pollution and carbon emissions.