computeArea | R Documentation |

Compute area enclosed within an irregular polygon - i.e. defined by curves

```
computeArea(x)
```

`x` |
k x 2 or k x 3 matrix containing ordered coordinates forming the boundary of the area. For 3D-cases, the area should be closed to a 2D surface (see details below). |

For 3D coordinates, a PCA is computed and only the first two PCs are used to compute the area. This is a projection of the coordinates onto a 2D plane spanned by those PCs.

returns a list containing

`area` |
size of the enclosed area |

`xpro2D` |
projected coordinates of x in the 2D plane. |

`poly` |
object of class |

`xpro3D` |
For 3D-cases, this contains the projected coordinates of x rotated back into the original coordinate system |

in case custom planes are preferred, the data can first be projected onto such a custom defined plane via `points2plane`

first.

```
require(shapes)
require(sf)
myarea <- computeArea(gorf.dat[c(1,6:8,2:5),,1])
myarea$area
plot(myarea$poly)
## 3D example
data(boneData)
myarea3D <- computeArea(boneLM[c(4,2,3,7,5,6,8),,1])
plot(myarea3D$poly)
cent <- colMeans(myarea3D$xpro2D)
text(cent[1],cent[2],labels=paste0("Area=",round(myarea3D$area,digits=2)))
```

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