the rules to establish the definition of the basis for the calculation of aid, including rules on how to deal with certain cases in which eligible areas contain landscape features or trees;
rialacha chun go mbunófar sainmhíniú ar an mbonn le cabhair a ríomh, lena n-áirítear rialacha maidir leis an gcaoi le déileáil le cásanna áirithe ina bhfuil gnéithe tírdhreacha nó crainn sna limistéir incháilithe;