T-CI 330-2024 主動(dòng)激光衛(wèi)星淺水水下地形提取技術(shù)規(guī)范

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中國國際科技促進(jìn)會(huì)發(fā)布I 2 2 2 3 37.2數(shù)據(jù)處理 3 4 48.2折射校正 48.3潮汐校正 5 6 69.2精度要求 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)、中國四維測繪技術(shù)有限12規(guī)范性引用文件3.1潮汐校正oceantidecorre3.2水體其固有光學(xué)參數(shù)的變化主要由浮游植物及其附屬物的變化決定3.3地球物理校正geophysicalcorrec校正激光傳輸過程中大氣、地球固體潮、極潮等引起3.43.53.623.73.83.9水下地形提取underwatertopographyextra3.10折射校正refractioncor3.114符號(hào)與縮略語MRE：平均相對誤差（MeanRelativeErr5.3深度基準(zhǔn)面應(yīng)采用理論最低潮面，在遠(yuǎn)離大陸的島、礁，其深度基準(zhǔn)面可采用當(dāng)?shù)仄骄Ｆ矫妗?.6成果的生產(chǎn)、分發(fā)和使用應(yīng)符合保密的相關(guān)規(guī)定。3主動(dòng)激光衛(wèi)星DBSCAN算法海底點(diǎn)云/實(shí)測水深數(shù)據(jù)/ 水深提取DBSCAN算法海底點(diǎn)云/實(shí)測水深數(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)水下地形測深產(chǎn)品7.1數(shù)據(jù)下載與篩選選擇覆蓋測量區(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7.2數(shù)據(jù)處理y=Ae-(x-μ)2/2σ2···································································(1)E——誤差平方和；i——第i個(gè)光子高度直方圖值；4yi——第i個(gè)高斯函數(shù)擬合值。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di，采用下列公式:di=√(x0?xi)2+(y0?yi)2·························································(3)x0——當(dāng)前光子點(diǎn)沿軌距離；y0——當(dāng)前光子點(diǎn)高度；設(shè)定半徑R與半徑內(nèi)包含最小光子點(diǎn)數(shù)Minpts,統(tǒng)計(jì)di小于R的光子數(shù)Npts，Npts大于Minpts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Dins,i=Hbot,i?Hsur································································(4)Dins,i——第i個(gè)海底光子點(diǎn)對應(yīng)的瞬時(shí)水深；Hsur——海面光子點(diǎn)高度。8.1地球物理校正讀取二級(jí)產(chǎn)品中地球物理校正變量geop?ys_corr，將點(diǎn)云高度加地球物理校正變量即可完成地球8.2折射校正將經(jīng)過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5{aS?sinθ2·····························································(5)P2=S2+R2?2SRcosφ (6) (7) (9) (10)Dcor=Dins?ΔZ (11)ΔZ——水深折射校正項(xiàng)；8.3潮汐校正根據(jù)潮汐模型如GOT4.10模型計(jì)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(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：Dmms=Dcor?tide_equilibrium?tide_ocean········································(12)Dmms——當(dāng)?shù)仄骄Ｆ矫婊鶞?zhǔn)下的水深；6Dcor——瞬時(shí)水深；tide_equilibrium——長周期潮汐；tide_ocean——短周期潮汐。9精度評(píng)價(jià)利用船載聲吶或機(jī)載Lidar等實(shí)測水深數(shù)據(jù)，對經(jīng)過處理與校正的主動(dòng)激光衛(wèi)星點(diǎn)云測深數(shù)據(jù)進(jìn)行精度評(píng)價(jià)。定量評(píng)價(jià)指標(biāo)使用RMSE和MRE。精度評(píng)