Requesting a distance based isoline
To calculate a distance based isoline, specify distance as rangetype. Range will then be specified in meters. Mode can be either shortest or fastest. A different area can be reached by always driving the fastest possible route, than always driving the shortest possible route. The request below will calculate a 4km isoline around the center of Berlin with shortest mode. This answers the question: what area can I reach by travelling no more than 4km?
https://isoline.route.api.here.com/routing/7.2/calculateisoline.json
?app_id={YOUR_APP_ID}
&app_code={YOUR_APP_CODE}
&mode=shortest;car;traffic:disabled
&rangetype=distance
&start=geo!52.51578,13.37749
&range=4000

Drivers normally want to drive the fastest possible route. It is possible to calculate an isoline which simulates this behavior, while limiting it to a given distance. The request below will calculate a 4km isoline around the center of Berlin with fastest mode. This answers the question: what area can I reach by travelling no more than 4km, while driving the fastest possible route?
https://isoline.route.api.here.com
/routing/7.2/calculateisoline.json
?app_id={YOUR_APP_ID}
&app_code={YOUR_APP_CODE}
&mode=fastest;car;traffic:disabled
&rangetype=distance
&start=geo!52.51578,13.37749
&range=4000
