Improved map generation by a robotic work tool

摘要

A robotic work tool (100) comprising an altitude sensor (185) for providing a current altitude reading (HRL) and a controller (110) configured to receive the current altitude reading (HRL) from the altitude sensor (185); determine an altitude (H) based on the current altitude reading (HRL); determine a current position; and generating a map indicating elevations by including the determined altitude (H) for the current position in the map. A robotic work tool system (200) comprising a robotic work tool (100) and a reference altitude sensor (285) for providing a reference altitude reading (HCS), wherein the robotic work tool (100) is further configured to receive the reference altitude reading (HCS) from the reference altitude sensor (285); and determine the altitude (H) based on the current altitude reading (HRL) and the reference altitude reading (HCS).