Analysis of Seasonal Daytime Urban Thermal Environment Dynamics in a Tropical Coastal City Based on the Spatiotemporal Fusion Model

Table 5

Landscape metrics selected in this study.

Metrics (abbreviation)	Level	Description and equation
Class area (CA)	Class	The total area of a given patch type in the entire landscape (unit: ha); is the area of patch
Patch density (PD)	Class	The number of patches divided by the total area of the landscape (unit: n/100 ha); is the number of patches in the landscape for patch class i; A is the total landscape area
Largest patch index (LPI)	Class	The percentage of the landscape comprised by the largest patch (unit: %)
Aggregation (AI)	Class	Contagion index: the focal class, not adjacencies with other patch types (unit: %); is the number of like adjacencies between pixels of patch class i based on the single-count method; is the max value of
Edge density (ED)	Class	Total length of all edge segments of corresponding patch per hectare (unit: m/ha); is the total length of edges for patch class i and patch j in the landscape
Perimeter-area fractal dimension (PAFRAC)	Class	Shape index based on perimeter and area measurement (unit: none); is the perimeter of patch
Shannon’s diversity index (SHDI)	Landscape	A diversity in the whole community ecology (unit: none); is the proportion of landscape occupied by patch class i；m is number of path classes present in the landscape
Shannon’s evenness index (SHEI)	Landscape	A measurement of patch diversity (unit: none)
Contagion index (CONTAG)	Landscape	Aggregation of all patch types (unit: none); is the number of like adjacencies between pixels of patch class k based on the double-count method
Interspersion and juxtaposition index (IJI)	Landscape	Observed interspersion divided by maximum interspersion for the patch classes in a landscape (unit: %); is the total length of edge in the landscape between patch classes i and k; E is the total length of edge in the landscape