Length and Area

This GeoBlazor Pro sample, written in Blazor for .NET developers, demonstrates planar and geodesic measurement with the GeometryEngine from the ArcGIS Maps SDK for JavaScript exposed through GeoBlazor's GeometryEngine service together with the SketchWidget and ScaleBarWidget Razor components. The page shows a 2D mid-century-themed basemap centered on the eastern Atlantic with a starting blue rectangle drawn over northwest Africa to seed the calculation. A SketchWidget in the upper-right corner provides Polyline, Polygon, and Rectangle drawing tools so the user can replace or modify the shape; a ScaleBarWidget sits in the lower-right corner. Whenever a sketch is created or updated, the sample calls GeometryEngine.GeodesicArea, PlanarArea, GeodesicLength, or PlanarLength as appropriate and writes the resulting square-kilometer or kilometer values into a measurements overlay docked at the bottom of the map. The sample is intended to demonstrate how planar and geodesic measurement diverge for large regions when calculated alongside live user input.