(1) B−Vrepresents the temperature difference between built-up area and
vegetation. (2)B−Wrepresents the difference between built-up area and water.
(3)B−Drepresents the difference between built-up area and development. (4)
B−Vrepresents the difference between built-up area and fish pond. (5) B−C
represents the difference between built-up area and cropland. (6) B−A
represents the difference of built-up area and suburban areas.