The invention relates to a system for processing a ground at least partially in an outdoor region, in particular removing dirt or grass cuttings, comprising a base station and a mobile robot unit. The technical problem of improving the operating results of a mobile robot unit while simultaneously improving operating safety, is solved in that at least one detection means for detecting at least one environmental variable is provided, and in that a controller is provided which influences the operating mode of the mobile robot unit in accordance with the value of at least one of the environmental variables detected by the at least one detection means. The invention further relates to a method for controlling a mobile robot unit for processing a ground at least partially in an outdoor region, in particular removing dirt or grass cuttings.本發明係有關於一種用於至少部分地在一外部區域內處理地面,特別是清除污物或割草,的系統,具有一基站及一行動機器人單元。本發明之技術課題在於在改善操作可靠性的同時提高行動機器人單元的工作結果,本發明用以克服上述技術課題之解決方案為,設有至少一用於偵測至少一環境參數的偵測構件,以及,設有一控制裝置,其根據該至少一偵測構件所偵測到的至少一環境參數之值來影響該行動機器人單元的工作方式。本發明亦有關於一種對用於至少部分地在一外部區域內處理地面,特別是清除污物或割草,的行動機器人單元進行控制的方法。