FieldengGeospatial & Survey
Polygon Area
Planar shoelace area and perimeter from ordered local easting/northing vertices.
Geospatial & SurveyConstruction & Trades
Planar shoelace area and perimeter from ordered local easting/northing vertices.
App id: GEO-12. Reference version 1.0.
How to fill it
Add rows as you need them. The tool uses every row you enter.
On the tool screen, Calc is the working sheet. Presets stores values you reuse. Reference is the formula, assumptions, and provenance below.
Formula
A = ½ |Σ(xᵢyᵢ₊₁ − xᵢ₊₁yᵢ)|Inputs
| Name | Unit |
|---|---|
| Easting | m |
| Northing | m |
Outputs
| Name | Unit |
|---|---|
| Area (hero result) | m2 |
| Perimeter | m |
Diagnose
This tool does not attach diagnose observations.
Assumptions
- Vertices are ordered. Consecutive duplicates are rejected.
Provenance
- Project geographic points before using this tool. Self-intersecting rings return the algebraic absolute area, not a cleaned polygon.