Topography |
Average elevation |
The average elevation in the subwatershed area. |
\(AE=average(elevation)\) |
Drainage
capacity
|
Distance to river
|
Average distance from each grid to the river in the subwatershed
area.
|
\[d=\sqrt{\sum_{i=1}^{n}{(x_{i}-y_{i})}^{2}}\]
|
|
Road density |
Ration of road area to the subwatershed area. |
\(Rd=\frac{A_{\text{roads}}}{\text{Ssite}}\) |
Land cover composition |
Green space ratio |
The proportion of green
space area to the total subwatershed area. |
\(GSR=\frac{A_{\text{green\ space}}}{\text{Ssite}}\) |
|
Waterbody ratio |
The proportion of waterbody area to the total
subwatershed area. |
\(WR=\frac{A_{\text{waterbody}}}{\text{Ssite}}\) |
|
Impervious surface ratio |
The proportion of impervious area to the
total subwatershed area. |
\(\text{ISR}=\frac{A_{\text{impervious}\ \text{surfaces}}}{\text{Ssite}}\) |
land cover configuration |
Patch density |
The ratio of the number of
patches to the total subwatershed area. |
\(PN=\frac{n_{i}}{A_{\text{subwatershed}}}\) |
|
Landscape shape index |
The shape index is a measure of the shape
complexity. |
\(LSI=\frac{0.25E}{\sqrt{A_{\text{subwatershed}}}}\) |
3D building morphology |
Building coverage ratio |
Building coverage
ratio of the subwatershed. |
\(BCR=\frac{\sum_{i=1}^{n}\text{BSi}}{\text{Ssite}}\) |
|
Building density |
Number of buildings in the subwatershed. |
\(BD=\frac{N}{A}\) |
|
Building congestion degree |
The density of buildings in 3D space. |
\(BCD=\frac{\sum_{i=1}^{n}V_{i}}{\max\left(H_{i}\right)*A}\) |
|
Building height |
The area-weighted average building height. |
\(BH=\frac{\sum_{i=1}^{n}{BSi*BHi}}{\sum_{i=1}^{n}\text{BSi}}\) |
|
Floor area ratio
3D shape index
3D fractal
|
Building area unit area of the subwatershed.
The degree of shape complexity.
The compactness of the buildings.
|
\[FAR=\frac{\sum_{i=1}^{n}{c*F}}{\text{Ssite}}\]
\[3DSI=\frac{\sum_{i=1}^{n}{(BSi+Li*BHi)}}{3*v*\sqrt{3v/4\pi}}\]
\[\lg{N(r)}=\operatorname{-Dlg}{r+c}\]
|