Kopo ea polokelo ea metsi a mollo, kaho ea khoebo ea mollo, ho latela litlhoko tsa lehae le litlatsetso tseo u lokelang ho li khetha.
Tumellanong le liteng tsa litekanyetso tsa machabeng tsa polokeho ea lijo tse koahetsoeng ka lipoleiti tsa tšepe, ho ka bonoa setifikeiti le litokelo tse ikhethang tse fumanehang leqepheng le amehang.
Litanka tsa GFS li fana ka polokelo e ntle ea metsi / metsi libakeng tse itseng tse ikhethang (libaka tsa lithaba, lihlekehleke, libaka tsa lehoatata).
E ka hlophisoa ho latela litlhoko tsa bareki, boholo ba tanka, 'mala, seismic grade, jj.