Height above sea level |
The location of the lake above sea level (m a.s.l.) |
N/A |
Digital Terrain Model and a polygon layer with the lake area |
Zonal Statistics |
Area (A) |
Water surface area without taking the area of islands into account |
N/A |
Polygon layer with the lake area |
Option calculate geometry area (in the attribute table) |
Maximum length (l) |
The shortest distance between the most distant points of the lake shore when measured along the line, without extending beyond the lake’s boundary |
N/A |
Polygon layer with the lake area |
Requires a Python script |
Maximum breadth (b) |
The greatest distance between opposite shores measured along a line perpendicular to the maximum length of the lake |
N/A |
Polygon layer with the lake area |
Requires a Python script |
Mean breadth (b̄) |
The ratio of the lake area to the maximum lake length |
b̄ = A/l |
Polygon layer with the lake area |
Requires a Python script that counts l and the calculate option (in the attribute table) |
Perimeter (L) |
The length of the lake shoreline measured along the 0 isobath |
N/A |
Polygon layer with the lake area |
Option calculate geometry perimeter (in the attribute table) |
Elongation index (λ) |
This parameter gives an overview of the shape of the lake surface. The greater its value, the more elongated the lake is |
λ = l/b̄ |
Polygon layer with the lake area |
Requires a Python script that counts l and the calculate option (in the attribute table) |
Shoreline development (DL) |
This parameter shows how close the shape of the shoreline is to the shape of a circle |
DL=L/(2√π⋅A) |
Polygon layer with the lake area |
Options of calculation several geometric and algebraic parameters (in the attribute table) |