T/CI330—2024主動激光衛(wèi)星淺水水下地形提取技術規(guī)范Technicalspecificationforshallowwaterbathymetryusingactivelasersatellites中國國際科技促進會發(fā)布I 2 2 2 3 3 3 4 4 4 5 6 6 6 6 6 6 7本文件按照GB/T1.1—2020《標準化工作導中心、浙江省水利河口研究院(浙江省海洋規(guī)劃設計研究院)、中國四維測繪技術有限123主動激光衛(wèi)星DBSCAN算法海底點云實測水深數(shù)據(jù) 水深提取DBSCAN算法海底點云實測水深數(shù)據(jù) 水深提取光子高度直方圖海面點云地球物理校正折射校正潮汐校正精度評價精度評價水下地形測深產(chǎn)品選擇覆蓋測量區(qū)域的主動激光衛(wèi)星二級產(chǎn)品選擇二級產(chǎn)品中數(shù)據(jù)完整、地表特征清晰的=?(?)2/22···································································(1)=∑1(?)2·································································(2)——誤差平方和；4選取海面以下光子點云，采用DBSCAN算法，計算一個光子點到第i個光子點之間的歐氏距離，采用下列公式:=√(0?)2+(0?)2·························································(3)0——當前光子點高度；設定半徑與半徑內(nèi)包含最小光子點數(shù),統(tǒng)計小于的光子數(shù)，大于的光選取距第i個海底點最鄰近海面光子點，計算二者高度差值作為剖面水深。剖面水深計算采用下列,=,?································································(4)讀取二級產(chǎn)品中地球物理校正變量?_，將點云高度加地球物理校正變量即可完成地球將經(jīng)過地球物理校正后的瞬時剖面水深消除因水氣折射率不同導致的距離誤差，折射校正模型見55φ=θ?-θ?……… △Z=P*sinβ 8.3潮汐校正根據(jù)潮汐模型如GOT4.10模型計算得到長周期潮汐變量tide_equilibrium和短周期潮汐變量tide_ocean,將折射校正后的瞬時水深轉換至當?shù)仄骄Ｆ矫婊鶞氏碌乃睢３毕Ｕ捎孟铝泄剑?tide_ocean——短周期潮汐。9精度評價9.1精度評價公式利用船載聲吶或機載Lidar等實測水深數(shù)據(jù)，對經(jīng)過處理與校正的主動激光衛(wèi)星點云測深數(shù)據(jù)進行精度評價。定量評價指標使用RMS