MAPPING OF RILL EROSION OF ARABLE SOILS BASED ON UNMANNED AERIAL VEHICLES SURVEY СтатьяKashtanov A.N., Vernyuk Y.I., Savin I.Y., Shchepot’Ev V.V., Dokukin P.A., Sharychev D.V., Li K.A.Eurasian Soil Science. Том 51. 2018. С. 479-484