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PFINTR9 - Percentage of 1 km grid cell classified as interior forest (9x9)

Percentage of forest interior is calculated using a moving 270 meter square window (9 pixels x 9 pixels) across the land cover. When the entire window contains forest cover, the forest cell in the center of the window is classified as interior. The number of interior forest cells in the 1 km grid cell reporting unit is then divided by the grid cell’s total land area (the total number cells in the grid cell boundary minus those cells classified as water) to derive PFINTR9. Interior forest is required habitat for many species.