As part of our programme of technology trials, sensor equipment and earth observation techniques have been employed at over 70 higher-risk coal tip sites across Wales.
Fel rhan o'n rhaglen o dreialon technoleg, mae offer synhwyro a thechnegau arsylwi ar y ddaear wedi'u cyflogi mewn dros 70 o safleoedd tomenni glo risg uwch ledled Cymru.