I use the latest version of Turf to calculate the area of a geojson polygon. The area result from Turf is: 22.13 m2 and Geographic Lib (https://geographiclib.sourceforge.io/) 22.06 m2. I also checked on QGIS the area result is 22.03 m2 So Geographic Lib has higher accuracy th...
This search area is then cross-referenced to all the points of interest in the Zoopla database (i.e. the properties for sale) and a travel time to each relevant property is listed. Properties that are reachable within the travel time limit are shown. The houses are displayed both as pin...