DB11北京市市場監(jiān)督管理局發(fā)布 本文件按照GB/T1.1—2020《標準化工作導則地表水體長度和面積遙感監(jiān)測技術(shù)規(guī)范本文件適用于寬度大于4m、面積大于100m2的地表水體長度和面積衛(wèi)星遙感監(jiān)測與數(shù)據(jù)分析。針對河流、渠道在時段內(nèi)各月單次有水河長的算單次監(jiān)測中某河流、湖泊、水庫、渠道、坑塘的3.5衛(wèi)星影像、控制基準、數(shù)字高衛(wèi)星影像、控制基準、數(shù)字高（輻射校正、正射糾正、影像配準和影像融合）主要包括數(shù)據(jù)收集與處理、水體提取和統(tǒng)計分析，詳細數(shù)據(jù)收集與處理數(shù)據(jù)收集與處理·單景影像水體面狀數(shù)據(jù)提取·單景影像水體面狀數(shù)據(jù)提取水體提取水體提取行政區(qū)、流域水體面狀和線行政區(qū)、流域水體面狀和線否否是統(tǒng)計分析統(tǒng)計分析行政區(qū)、流域單次水體面積和有水河長統(tǒng)計行政區(qū)、流域單次水體面積和有水河長統(tǒng)計行政區(qū)、流域單次水體面積和有水河長百分率5.2輔助數(shù)據(jù)5.3影像處理對衛(wèi)星影像進行輻射校正、正射糾正、影像配準和影像融合等處理，生成正射融合影像產(chǎn)），采用人工判讀的方法，運用GIS軟件對提取出的地表水體數(shù)據(jù)進行直接判讀、綜合分析、邏b)暗涵段下游有水時應(yīng)視為暗涵段有水；基于水體的空間位置和屬性信息，運用GIS軟件對多景影像提取的水體面狀矢量數(shù)據(jù)進行于重疊區(qū)域，應(yīng)優(yōu)先選取較高分辨率影像成果并輔助人工修正6.3行政區(qū)、流域水體面狀和線狀數(shù)據(jù)提取6.4精度評價6.4.1.2建立混淆矩陣，行代表核實的地物類別，列代表提取結(jié)果中的地x11x12x21x22×100%·····················x11——水體提取正確的檢驗點個數(shù)；6.5面積、長度計算6.6成果要求Sw=Σ=1Swa·········································································Sw——行政區(qū)、流域單次水體面積總和，Lw=Σ1Lwi·········································································7.2行政區(qū)、流域單次水體面積和有水河長百分率×100%······················×100%······················）；），7.3數(shù)據(jù)精度要求7.3.1面積保留4位小數(shù)，長度保留2位小數(shù)。7.3.2數(shù)值的修約應(yīng)按照GB/T8170的相關(guān)規(guī)定執(zhí)行。參考指數(shù)NDWI=················································NDVI=·························································SWI=RGreen+Rblue—Rnir························································(A.3)Rgreen