Точність цифрового наближення поверхні суші головним чином залежить від впливу градієнта землі та точності висоти точок ДТМ. . В роботі представлено проблему впливу градієнта суші та точності висоти точок ДТМ на цифровій апроксимації поверхні суші щодо виконаних експериментів.
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