Muzhenskiy Dmitriy A. RussiaSaratovSaratov State University, 83, Astrakhanskaya Str., Saratov, 410012, Russiadimamyzhen@mail.ru Author's articles Studying Linear Erosion by Means of Creating a Refined Digital Elevation Model Based on SRTM (The Khvalynsk District of the Saratov Region as an Example)