Fig. 2. Areas where NDVI significantly predicted population trends of Common House-Martin based on NDVI data aggregated in cells from 0.5° latitude x 0.5° longitude to 3° latitude x 3° longitude. Fig. 2
Notes: The size and total number of cells below latitude 20 N entered in the analyses is shown, as well as the number of cells at each spatial scale whose t-value exceeded 3, 4, or 5. Yellow cells: t-values of NDVI between 3 and 4; orange cells: t-values of NDVI between 4 and 5; red cells: t-values of NDVI larger than 5. Lombardy is highlighted in black.