T/CI330—2024主動(dòng)激光衛(wèi)星淺水水下地形提取技術(shù)規(guī)范Technicalspecificationforshallowwaterbathymetryusingactivelasersatellites中國(guó)國(guó)際科技促進(jìn)會(huì)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(biāo)準(zhǔn)化工作導(dǎo)中心、浙江省水利河口研究院(浙江省海洋規(guī)劃設(shè)計(jì)研究院)、中國(guó)四維測(cè)繪技術(shù)有限123主動(dòng)激光衛(wèi)星DBSCAN算法海底點(diǎn)云實(shí)測(cè)水深數(shù)據(jù) 水深提取DBSCAN算法海底點(diǎn)云實(shí)測(cè)水深數(shù)據(jù) 水深提取光子高度直方圖海面點(diǎn)云地球物理校正折射校正潮汐校正精度評(píng)價(jià)精度評(píng)價(jià)水下地形測(cè)深產(chǎn)品選擇覆蓋測(cè)量區(qū)域的主動(dòng)激光衛(wèi)星二級(jí)產(chǎn)品選擇二級(jí)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(diǎn)云，采用DBSCAN算法，計(jì)算一個(gè)光子點(diǎn)到第i個(gè)光子點(diǎn)之間的歐氏距離，采用下列公式:=√(0?)2+(0?)2·························································(3)0——當(dāng)前光子點(diǎn)高度；設(shè)定半徑與半徑內(nèi)包含最小光子點(diǎn)數(shù),統(tǒng)計(jì)小于的光子數(shù)，大于的光選取距第i個(gè)海底點(diǎn)最鄰近海面光子點(diǎn)，計(jì)算二者高度差值作為剖面水深。剖面水深計(jì)算采用下列,=,?································································(4)讀取二級(jí)產(chǎn)品中地球物理校正變量?_，將點(diǎn)云高度加地球物理校正變量即可完成地球?qū)⒔?jīng)過(guò)地球物理校正后的瞬時(shí)剖面水深消除因水氣折射率不同導(dǎo)致的距離誤差，折射校正模型見(jiàn)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(jì)算得到長(zhǎng)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(shí)水深轉(zhuǎn)換至當(dāng)?shù)仄骄Ｆ矫婊鶞?zhǔn)下的水深。潮汐校正采用下列公式：6tide_ocean——短周期潮汐。9精度評(píng)價(jià)9.1精度評(píng)價(jià)公式利用船載聲吶或機(jī)載Lidar等實(shí)測(cè)水深數(shù)據(jù)，對(duì)經(jīng)過(guò)處理與校正的主動(dòng)激光衛(wèi)星點(diǎn)云測(cè)深數(shù)據(jù)進(jìn)行精度評(píng)價(jià)。定量評(píng)價(jià)指標(biāo)使用RMS