Fig. 2

An illustration for different urban land products in Greater Bay Area, China, in 2015. (a) Building volume product from Li et al.1. (b) ESA-CCI-LC. (c). CLCD from Yang et al.2. (d) CNLULC from Liu et al.3 (e) GlobaLand30 from Chen et al.4. (f) MCQ12Q1 product. Red pixels refer to urban land, while the black lines refer to urban boundary from Li et al.5.