Elevation value-based 3D barrier method and device for remote sensor automatic safety area screening

The invention provides an elevation value-based 3D barrier method for remote sensor automatic safety area screening. The method includes: a remote sensor analyzes 3D terrain data features in an on-orbit manner and statistically count the elevation value of the 3D terrain data so as to estimate safety landing candidate areas in an image, and sorting the candidate areas by statistically counting barrier points, and increasing the distance constraint among the candidate areas so as to obtain the final optimal safety landing area. The method has the advantages that remote sensing image safety point and barrier point judging based on the elevation value is adopted, and real-time selecting of the safety areas is achieved; by the method which is low in operation cost and fast and can satisfy the requirement of short landing time of a landing device, safety landing areas can be timely selected by using 3D image information. The invention further relates a 3D barrier device for remote sensor automatic safety area screening.