矢形紋 的英文怎麼說
中文拼音 [shǐxíngwén]
矢形紋
英文
sagitta-
The constitutions and principles of position of gps > glonass and beidou navigation system are described all around in this article, and the following technologies are studied and realized : communication between com ports with oop technology, compound navigation with gps and glonass. calculate velocity, pseudorange difference, smoothing pseudorange with the carrier - phase and models to correct error are also done ; the transforms between wgs - 84 and pz - 90, as well as wgs - 84 and beijing54 coordinate system ; the technologies to display and manage bitmap, vector map based on mapx also ; conversion of data formats between gjb and mif data format of maplnfo corp. arithmetic of creation dem data based on contour line data from 1 -. 25000 map data with gjb format. texture the surface of terrains with corrected aviation image
本文全面介紹了gps 、 glonass 、北斗導航系統的組成、定位原理，研究並實現了面向對象的串口通信技術、 gps + glonass組合導航、測速及偽距差分、相位平滑偽距差分以及有關誤差的模型改正、 wgs ? 84和pz ? 90 、 wgs ? 84和北京54坐標系的坐標轉換、柵格地圖的顯示和管理、基於mapx的矢量地圖的顯示和管理、 1 : 25萬軍標數據和mapinfo的mif數據格式雙向轉換、基於軍標數據的dem生成演算法、基於opengl的三維地形構造、航空圖像紋理地形表面、三維坐標量算、虛擬現實模擬導航、三維地形的層次細化演算法以及數字圖像處理中的圖像增強、幾何變換、影像匹配等技術。Algorithm of terrain visualization by using scanning terrain map as texture ; 2. the simplified algorithm of view - point related multi - resolution terrain and the extended algorithm while its data are distributed like a band ; 3. the visual application of spatial query technique in the field of vector elements overlapping and the simulative evolution of flood
在諸多技術中，結合防汛決策支持系統對可視化的具體要求，本文重點論述了：以掃描地形圖為紋理的地形可視化演算法；基於幾何模型的視點相關多解析度地形簡化演算法及其在數據呈帶狀分佈情況下的擴展演算法；空間查詢技術在矢量要素疊加和洪水模擬演進方面的可視化應用。Content - based image rrtrieval ( cbir ) is a kind of retrieval, which derictly use content of an image for information search, it is one of most active researches in multimedia retrieval field. in order to analysis the informations included in an image, the cbir system always ultilize the color, texture, shape and other low level image features. to establish the feature vectors as retrieval index. in present time, the main cbir method is similiarity search based on multi - dimension feature vector of image
基於內容的圖像檢索（ cbir ， content - basedimageretrieval ）是指直接採用圖像內容進行圖像信息查詢的檢索。基於內容的圖像檢索技術是當前多媒體檢索研究的熱點之一。基於內容的圖像檢索方法，其主要思想是根據圖像所包含的色彩、紋理、形狀以及對象的空間關系等低層圖像特徵來分析圖像信息，建立圖像的特徵矢量作為其索引，檢索方法目前主要是根據圖像的多維特徵進行相似查詢。
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