5 results about "Minimum distance" patented technology

The invention relates to an automatic updating method of a land-use map based on historical data and remote sensed data. Firstly historical data is pre-processed to obtain a land-use patch number map and a land-use mode code map which are overlapped with a remote sensed image first main component map, and various land-use mode patch feature structure arrays are obtained through calculation; changed patches are detected by adopting a cycle average value significance statistical test method; land-use unchanged regions are used as the samples of land-use interest regions; and minimum distance supervised classification is performed to land-use changed regions to obtain the land-use maps of the changed regions, and the land-use maps of the changed regions are united with the images of and-use unchanged regions to obtain new land-use maps. The automatic updating method adopts two data sources, improves the variation test precision, realizes the updating automation of the land-use maps, can be applied to the departments of land and resources to update a great amount of land-use map data, quickly test the land-use variation, and has wide market prospect and application value.

The embodiment of the invention provides a construction method and device for a double-layer path of a vehicle-mounted unmanned aerial vehicle. The method comprises the steps that cluster grouping isperformed according to a minimum distance of a task target point space of the unmanned aerial vehicle, and a Hamilton path conforming to unmanned aerial vehicle cruising ability constraint of each group is constructed; and the Hamilton paths corresponding to all the groups are merged and adjusted through a connection algorithm, and a loop starting from a base point through a starting point and anending point of each Hamilton path back to the base point is constructed. Through the method, a double-layer path planning scheme of the vehicle-mounted unmanned aerial vehicle during cooperative collection of target information is quickly established, it is guaranteed that the vehicle-mounted unmanned aerial vehicle travels by one loop in a path network within a planning area, the unmanned aerialvehicle completes collection of information at all task target points, and working efficiency is greatly improved.

The invention relates to a home decoration articles of daily use, particularly to a multifunctional mat. The multifunctional mat comprises a sound-proof layer and a supporting layer, wherein the supporting layer is located below the sound-proof layer; the sound-proof layer is in a closed planar structure; the supporting layer comprises a plurality of supporting units; the supporting units have a plurality of first sound-proof faces which are arranged in the longitudinal direction of the supporting layer and perpendicular to the surface of the sound-proof layer; the minimum transverse distance of adjacent first sound-proof faces between adjacent supporting units is 0.5-500 mm; the distance of adjacent first sound-proof faces of the same supporting unit is 1-1000 mm; and the minimum distance between the surfaces, farthest from the sound-proof layer, of the supporting units and joints of the sound-proof layer and the first sound-proof faces is 0.3-39 mm. The multifunctional mat can realize ventilation effectively, is damp-proof and mold-proof and insulates sound and reduces noise. The mat feels comfortable with feet and is particularly suitable for being laid below a floor.