MetricCanvas

MetricCanvas turns an image with a known measurement into a surface you can measure on. It can be a floor plan, a technical drawing or a map: you mark a reference distance and the tool calculates the rest at the same scale.

One reference, many measurements

Calibration is set with a line or with the diameter of a circle. Its real length gives the ratio between pixels and units. Adjusting the reference recalculates the measurements on the drawing. Accuracy depends on that reference and on the image keeping a consistent scale.

Working on the canvas

I built a canvas with zoom and pan for placing images, drawing distances and editing their labels. Layers let you order and hide elements; history lets you undo and redo without starting over.

All image work happens in the browser. There is no need to send images to a server to measure them. The application is free.