毛節(jié)泰，李成才，張軍華，等

·高被引論文摘要·

被引頻次：235

MODIS衛(wèi)星遙感北京地區(qū)氣溶膠光學(xué)厚度及與地面光度計(jì)遙感的對(duì)比

毛節(jié)泰，李成才，張軍華，等

介紹MODIS衛(wèi)星遙感氣溶膠的方法，利用北京大學(xué)地面多波段太陽(yáng)光度計(jì)的觀測(cè)進(jìn)行了對(duì)比，二者的相關(guān)性比較好。給出了描述北京地區(qū)氣溶膠光學(xué)厚度分布的幾幅圖片。衛(wèi)星遙感對(duì)于更好地研究空氣污染提供了一種新手段，衛(wèi)星遙感的氣溶膠光學(xué)厚度彌補(bǔ)了地面觀測(cè)空間覆蓋不足的缺陷。衛(wèi)星遙感的氣溶膠資料不僅對(duì)全球和區(qū)域氣候研究而且對(duì)城市污染分析提供了豐富的資料。

衛(wèi)星遙感；氣溶膠光學(xué)厚度；地面光度計(jì)

來(lái)源出版物：大氣科學(xué),2003,27(5):869-880

被引頻次：222

多衛(wèi)星遙感數(shù)據(jù)的信息融合：理論、方法與實(shí)踐

何國(guó)金，李克魯，胡德永，等

摘要：首先介紹了信息融合技術(shù)的有關(guān)內(nèi)容，進(jìn)而對(duì)多衛(wèi)星遙感數(shù)據(jù)融合的研究歷史及現(xiàn)狀進(jìn)行了簡(jiǎn)要的綜述。在此基礎(chǔ)上，以地質(zhì)應(yīng)用為目標(biāo)，探討了多衛(wèi)星數(shù)據(jù)融合的小波變換方法，研究了不同長(zhǎng)度的小波基對(duì)融合結(jié)果的影響，提出了改進(jìn)的小波融合模型（CMWD）。同時(shí)，對(duì)比評(píng)價(jià)了基于小波變換CMWD、IHS變換、PCA分析的融合結(jié)果在提高空間分辨率、保持原始圖象光譜信息的優(yōu)劣。最后，提出了基于Multi Agent思想的多衛(wèi)星遙感信息融合系統(tǒng)框架構(gòu)想。

關(guān)鍵詞：衛(wèi)星遙感；信息融合；小波變換

來(lái)源出版物：中國(guó)圖象圖形學(xué)報(bào)：A輯,1999, 4(9):744-750

被引頻次：149

高分辨率遙感衛(wèi)星影像在土地利用分類及其變化監(jiān)測(cè)的應(yīng)用研究

孫丹峰，楊冀紅，劉順喜

摘要：研究了IKNOS米級(jí)高分辨率遙感影像在大比例尺土地利用圖件更新中的應(yīng)用技術(shù)，提出采用基于知識(shí)的土地利用覆蓋分類以及變化監(jiān)測(cè)系統(tǒng)方法，首先利用NDVI植被指數(shù)和半方差紋理特征的知識(shí)進(jìn)行影像大類區(qū)域分割；其次結(jié)合光譜知識(shí)對(duì)各影像區(qū)域進(jìn)行詳細(xì)分類，同時(shí)利用區(qū)域生長(zhǎng)技術(shù)與地類空間知識(shí)進(jìn)行區(qū)域分類；第三步是分類后處理與變化信息提取，利用基礎(chǔ)圖件提供的知識(shí)與各區(qū)域分類進(jìn)行比較以發(fā)現(xiàn)變化的區(qū)域。北京房山良鄉(xiāng)試驗(yàn)區(qū)的試驗(yàn)表明，Kappa系數(shù)為0.912，總精度為0.938；變化信息錯(cuò)誤率為13.69%，基于知識(shí)的分類與變化信息自動(dòng)提取可以為在GIS/RS環(huán)境下的目視數(shù)字化提供目標(biāo)，加速土地利用基礎(chǔ)圖件的更新作業(yè)過(guò)程。

關(guān)鍵詞：IKNOS衛(wèi)星影像；基于知識(shí)；土地利用分類與變化監(jiān)測(cè)

來(lái)源出版物：農(nóng)業(yè)工程學(xué)報(bào),2002,18(2):160-164

被引頻次：142

衛(wèi)星遙感監(jiān)測(cè)城市擴(kuò)展與環(huán)境變化的研究

戴昌達(dá)，唐伶俐，陳剛，等

摘要：本文闡述應(yīng)用北京地區(qū)自1984年至1992年4景秋季的TM圖像，通過(guò)高精度幾何配準(zhǔn)，輻射水準(zhǔn)歸一化，熱圖像條紋噪聲消除，各種干擾因素的識(shí)別。壓抑、剔除，目標(biāo)信息的增強(qiáng)、提取，以及背景影像的生成等圖像應(yīng)用處理，直接獲得試區(qū)8年間城鎮(zhèn)建設(shè)用地、綠地、水體，城市熱島等環(huán)境要素變化動(dòng)態(tài)，快速制出客觀反映城市擴(kuò)展變化的系列圖件。

關(guān)鍵詞：衛(wèi)星遙感；城市擴(kuò)展；環(huán)境變化；圖像應(yīng)用處理

來(lái)源出版物：環(huán)境遙感,1995,10(1):1-8

被引頻次：136

衛(wèi)星遙感估測(cè)土壤水分的一種方法

劉培君，張琳艾，里西爾·庫(kù)爾班，等

摘要：對(duì)于植被影響土壤水分遙感的大小，提出了“光學(xué)植被蓋度”新概念來(lái)衡量，并用遙感法進(jìn)行估測(cè)。用分解象元法排除植被干擾來(lái)提取土壤水分光譜信息。采用土壤水分光譜法并借助回歸分析建立土壤水分遙感的TM數(shù)據(jù)模型。以此為橋梁，建立了AVHRR數(shù)據(jù)模型。

關(guān)鍵詞：土壤水分；遙感；光學(xué)植被蓋度

來(lái)源出版物：遙感學(xué)報(bào),1997,1(2):135-138

被引頻次：123

衛(wèi)星遙感雪蓋制圖方法對(duì)比與分析

王建

摘要：利用LandsatTM、NOAA/AVHRR和中分辨率成像光譜儀（MODIS）三個(gè)平臺(tái)傳感器的遙感數(shù)據(jù)，分別使用訓(xùn)練樣本監(jiān)督分類、閾值數(shù)字信號(hào)統(tǒng)計(jì)、雪蓋指數(shù)方法制作雪蓋圖和提取積雪面積。結(jié)果表明：不同傳感器遙感圖像因時(shí)相和時(shí)空分辨率的差異，提取積雪信息的有效方法有所不同。但基于反射特性的雪蓋指數(shù)計(jì)算法具有普遍的實(shí)際操作性意義，即雪蓋制圖精度高，分類合理，是提取積雪信息的最佳技術(shù)手段；當(dāng)使用監(jiān)督積雪分類時(shí)，只有取得精確的信號(hào)文件，分類結(jié)果才是可信的；而閾值數(shù)字信號(hào)統(tǒng)計(jì)的雪的閾值確定具有很大的經(jīng)驗(yàn)性和隨機(jī)性，但對(duì)數(shù)據(jù)不完整或只有單波段時(shí)也不失為有效和簡(jiǎn)便的途徑；山影補(bǔ)償處理法基本可以消除地形陰影的影響；而去云后其覆蓋下的積雪恢復(fù)技術(shù)值得進(jìn)一步討論。

關(guān)鍵詞：雪蓋制圖；閥值法像元統(tǒng)計(jì)；雪蓋指數(shù)法；監(jiān)督分類

來(lái)源出版物：遙感技術(shù)與應(yīng)用,1999,14(4):29-36

被引頻次：118

夏季城市熱場(chǎng)的衛(wèi)星遙感分析

陳云浩，王潔，李曉兵

摘要：利用1998年8月4日上海幅TM6圖像，經(jīng)定位、配準(zhǔn)、糾正、圖像處理、噪聲剔除、亮溫標(biāo)定及特征提取等步驟，得出上海市亮溫分布場(chǎng)，同時(shí)對(duì)其熱力景觀、細(xì)部結(jié)構(gòu)及其成因做了分析。實(shí)踐證明，TM6圖像可作為城市熱環(huán)境質(zhì)量評(píng)價(jià)、生態(tài)城市規(guī)劃的背景資料和依據(jù)。

關(guān)鍵詞：城市熱島效應(yīng)；熱場(chǎng)；遙感；上海

來(lái)源出版物：國(guó)土資源遙感,2002, 4: 55-59

被引頻次：113

高分辨率衛(wèi)星遙感影像在土地利用變化動(dòng)態(tài)監(jiān)測(cè)中的應(yīng)用

廖克，成夕芳，吳健生，等

摘要：20世紀(jì)80年代初以來(lái)，隨著經(jīng)濟(jì)的快速發(fā)展，我國(guó)土地利用結(jié)構(gòu)發(fā)生了明顯的變化，耕地資源數(shù)量減少，非農(nóng)業(yè)用地大量增加。及時(shí)、精確掌握土地資源的數(shù)量、質(zhì)量分布及其變化趨勢(shì)，關(guān)系著土地資源的持續(xù)發(fā)展與規(guī)劃。本文選擇地貌類型多樣、社會(huì)經(jīng)濟(jì)發(fā)達(dá)、土地利用變化較大的北京市昌平區(qū)，在 RS、GIS支持下對(duì)土地利用變化進(jìn)行動(dòng)態(tài)監(jiān)測(cè)、制圖與動(dòng)態(tài)變化分析典型試驗(yàn)。為了進(jìn)行土地利用的動(dòng)態(tài)變化分析，獲取了昌平地區(qū)俄羅斯 KOCMOC衛(wèi)星1986年與1998年SPIN-22 m分辨率的遙感影像數(shù)據(jù)，同時(shí)獲取了法國(guó)SPOT-5衛(wèi)星2004年2.5 m分辨率遙感影像數(shù)據(jù)，以及相應(yīng)的分辨率略低的多波段遙感影像數(shù)據(jù)。完成了1986年、1998年、2004三個(gè)年分的土地利用圖的編制，并完成了1986—1998年、1998—2004年以及1986—2004年3個(gè)時(shí)期昌平區(qū)土地利用變化圖及土地利用動(dòng)態(tài)變化分析。

關(guān)鍵詞：高分辨率；遙感影像；土地利用；動(dòng)態(tài)監(jiān)測(cè)

來(lái)源出版物：測(cè)繪科學(xué),2006,31(6):11-15

被引頻次：113

河口表層懸浮泥沙氣象衛(wèi)星遙感定量模式研究

李四海，惲才興

摘要：根據(jù)多時(shí)相NOAAAVHRR衛(wèi)星遙感數(shù)據(jù)和準(zhǔn)同步實(shí)測(cè)表層含沙量資料，分別利用經(jīng)暗像元大氣校正的遙感圖像灰度值、R1-R2相關(guān)關(guān)系曲線的斜率，以及泥沙指數(shù)等參數(shù)，建立泥沙遙感定量模式（灰度法、斜率法和泥沙指數(shù)法），并對(duì)3種模式的效果和適用性進(jìn)行了比較。灰度法由于只用了單個(gè)波段的光譜信息，模式的相關(guān)性較差；斜率法通過(guò)計(jì)算R1-R2關(guān)系曲線的斜率，達(dá)到大氣校正的目的。但由于在泥沙濃度交界面上存在斜率值躍變現(xiàn)象，會(huì)影響最終效果；泥沙指數(shù)法綜合應(yīng)用了Ch1，Ch2波段的光譜信息，模式的相關(guān)性較好，可獲得層次豐富泥沙圖像。

關(guān)鍵詞：衛(wèi)星遙感；定量模式；圖像灰度；斜率；泥沙指數(shù)

來(lái)源出版物：遙感學(xué)報(bào),2001, 5(2):154-160

被引頻次：113

高分辨率衛(wèi)星遙感數(shù)據(jù)在土地利用動(dòng)態(tài)監(jiān)測(cè)中的應(yīng)用研究

楊清華，齊建偉，孫永軍

摘要：選擇土地利用變化類型較多的北京市大興區(qū)為試驗(yàn)區(qū)，通過(guò)分析印度 IRS、韓國(guó) KOMPSAT-1、美國(guó)IKONOS等高分辨率衛(wèi)星數(shù)據(jù)的獲取途徑、覆蓋周期、衛(wèi)星運(yùn)行狀況、監(jiān)測(cè)成本估算、技術(shù)條件和設(shè)備要求，對(duì)其在土地利用動(dòng)態(tài)監(jiān)測(cè)中的可行性進(jìn)行了研究；測(cè)算了高分辨率衛(wèi)星數(shù)據(jù)的主要技術(shù)參數(shù)；分析原始圖像上各主要土地類型的灰度分布范圍及其直方圖特征，總結(jié)不同土地利用覆蓋類型與融合圖像變化信息的光譜特征。通過(guò)精度測(cè)算，確定了最大成圖比例尺。比較利用高分辯率衛(wèi)星IRS、KOMPSAT-1和SPOT與陸地衛(wèi)星 TM 多光譜數(shù)據(jù)組合的土地利用動(dòng)態(tài)監(jiān)測(cè)結(jié)果（識(shí)別 率、判對(duì)率、圖斑邊界吻合精度、可監(jiān)測(cè)的最小圖斑面積等），確定了不同高分辨率衛(wèi)星數(shù)據(jù)與TM多光譜衛(wèi)星數(shù)據(jù)組合后對(duì)土地利用類型的識(shí)別能力，建立了土地利用動(dòng)態(tài)監(jiān)測(cè)解譯標(biāo)志。在解決了若干關(guān)鍵技術(shù)問題的基礎(chǔ)上，形成了一套可推廣的、實(shí)用的技術(shù)方法和工作流程。

關(guān)鍵詞：高分辨率衛(wèi)星遙感數(shù)據(jù)；土地利用動(dòng)態(tài)監(jiān)測(cè)；應(yīng)用研究

來(lái)源出版物：國(guó)土資源遙感,2001,13(4):20-27, 68

被引頻次：1091

關(guān)鍵詞：ground deformations; SAR interferometry;synthetic aperture radar (SAR)

來(lái)源出版物：IEEE Transactions ongeoscience and Remote Sensing,2002, 40(11):2375-2383

被引頻次：707

Theglobal ozone monitoring experiment (GOME):Mission concept and first scientific results

Burrows, JP; Weber, M; Buchwitz, M; et al.

Abstract:Theglobal Ozone Monitoring Experiment(GOME) is a new instrument aboard the European Space Agency’s (ESA)Second European Remote Sensing Satellite(ERS-2), which was launched in April1995. The main scientific objective of thegOME mission is to determine theglobal distribution of ozone and several other tracegases, which play an important role in the ozone chemistry of the earth's stratosphere and troposphere.gOME:measures the sunlight scattered from the earth's atmosphere and/or reflected by the surface in nadir viewing mode in the spectral region240-790 nm at a moderate spectral resolution of between 0.2 and 0.4 nm.Using the maximum960-km across-track swath width, the spatial resolution of agOMEground pixel is 40 ×320km2for the majority of the orbit andglobal coverage is achieved in three days after 43 orbits. Operational data products ofgOME asgenerated by DLR-DFD, thegerman Data Processing and Archiving Facility (D-PAF)forgOME, comprise absolute radiometrically calibrated earthshine radiance and solar irradiance spectra (level1 products) andglobal distributions of total column amounts of ozone and NO2, (level2 products), which are derived using the DOAS approach (Differential Optical Absorption Spectroscopy). (Under certain conditions and some restrictions, the operational data products are publically available from the European Space Agency via the ERS Helpdesk.) In addition to the operational data products,gOME has delivered important information about otherminor tracegases such as OClO, volcanic SO2,H2CO from biomass burning, and tropospheric BrO. Using an iterative optimal estimation retrieval scheme, ozone vertical profiles can be derived from the inversion of the UV/VIS spectra. This paper reports on thegOME instrument, its operation mode, and the retrieval techniques, the latter with particular emphasis on DOAS(total column retrieval) and advanced optimal estimation(ozone profile retrieval). Observation of ozone depletion in the recent polar spring seasons in both hemispheres are presented. OClO observed bygOME under twilight conditions provides valuable information on the chlorine activation inside the polar vortex, which is believed to be responsible for the rapid catalytic destruction of ozone.Episodes of enhanced BrO in the Arctic, most likely contained in the marine boundary layer, were observed in early and late spring. Excess tropospheric nitrogen dioxide and ozone have been observed during the recent Indonesian fire in fall1997. Formaldehyde could also clearly be identified bygOME and is known to be a by-product resulting from biomass burning.

來(lái)源出版物：Journal of the Atmospheric Sciences,1999,56(2):151-175

被引頻次：675

The Moderate Resolution Imaging Spectroradiometer (MODIS): Land remote sensing forglobal change research

Justice, CO; Vermote, E; Townshend, JRG; et al.

Abstract:The first Moderate Resolution Imaging Spectroradiometer (MODIS) instrument is planned for launch by NASA in1998. This instrument will provide a new and improved capability for terrestrial satellite remote sensing aimed at meeting the needs ofglobal change research, The MODIS standard products will provide new and improved tools for moderate resolution land surface monitoring, These higher order data products have been designed to remove the burden of certain common types of data processing from the user community and meet the moregeneral needs ofglobal-to-regional monitoring,modeling, and assessment. The near-daily coverage of moderate resolution data from MODIS, coupled with the planned increase in high-resolution sampling from Landsat7, will provide a powerful combination of observations,The full potential of MODIS will be realized once a stable and well-calibrated time-series of multispectral data has been established. In this paper the proposed MODIS standard products for land applications are described along with the current plans for data quality assessment and product validation.

關(guān)鍵詞：Earth Observing System Moderate Resolution Imaging Spectroradiometer (EOS-MODIS);global change;monitoring; satellite remote sensing

來(lái)源出版物：IEEE Transactions ongeoscience and Remote Sensing,1998,36(4):1228-1249

被引頻次：669

Satellite remote sensing of primary production

Tucker, CJ; Sellers, PJ

Abstract:Leaf structure and function are shown to result in distinctive variations in the absorption and reflection of solar radiation from plant canopies. The leaf properties that determine the radiation-interception characteristics of plant canopies are directly linked to photosynthesis,stomatal resistance and evapotran-spiration and can be inferred from measurements of reflected solar energy. The effects of off-nadir viewing and atmospheric constituents,coupled with the need to measure changing surface conditions, emphasize the need for multitemporal measurements of reflected radiation if primary production is to be estimated.

來(lái)源出版物：International Journal of Remote Sensing,1986,7(11):1395-1416

被引頻次：486

Aerosol properties over bright-reflecting source regions

Hsu, NC; Tsay, SC; King, MD; et al.

Abstract:Retrieving aerosol properties from satellite remote sensing over a bright surface is a challenging problem in the research of atmospheric and land applications. In this paper we propose a new approach to retrieve aerosol properties over surfaces such as arid,semiarid, and urban areas, where the surface reflectance is usually, very, bright in the red part of visible spectrum and in the near infrared, but is much darker in the blue spectral region (i.e., wavelength ＜ 500 nm). In order to infer atmospheric properties from these data, aglobal surface reflectance database of 0.1 degrees latitude by 0.1 degrees longitude resolution was constructed over bright surfaces for visible wavelengths using theminimum reflectivity, technique (e.g., finding the clearest scene during each season for agiven location). The aerosol optical thickness and aerosol type are then determined simultaneously in the algorithm using lookup tables to match the satellite observed spectral radiances. Examples of aerosol optical thickness derived using this algorithm over the Sahara Desert and Arabian Peninsula reveal various dust sources, which are important contributors to airborne dust transported over long distances.Comparisons of the satellite inferred aerosol optical thickness and the values fromground-based Aerosol Robotic Network (AERONET) sun/sky radiometer measurements indicategood agreement (i.e., within30%)over the sites in Nigeria and Saudi Arabia. This new algorithm, when applied to Moderate Resolution Imaging Spectroradiometer (MODIS), Sea-viewing Wide Field of view Sensor (SeaWiFS), andglobal Imager (GLI) satellite data, will provide high spatial resolution (similar to1km)global information of aerosol optical thickness over bright surfaces on a daily basis.

關(guān)鍵詞：aerosols; algorithm; desert; remote sensing;satellite applications; terrestrial atmosphere

來(lái)源出版物：IEEE Transactions ongeoscience and Remote Sensing,2004, 42(3): 557-569

被引頻次：481

Objectively analyzed air-sea heat fluxes for theglobal ice-free oceans (1981-2005)

Yu, LS; Weller, RA

Abstract:A25-yr (1981–2005) time series of daily latent and sensible heat fluxes over theglobal ice-free oceans has been produced by synthesizing surface meteorology obtained from satellite remote sensing and atmospheric model reanalyses outputs. The project, named Objectively Analyzed Air–Sea Fluxes (OAFlux), was developed from an initial study of the Atlantic Ocean that demonstrated that such data synthesis improves daily flux estimates over the basin scale. This paper introduces the25-yr heat flux analysis and documents variability of theglobal ocean heat flux fields on seasonal, interannual, decadal, and longer time scales suggested by the new dataset. The study showed that, among all the climate signals investigated,the most striking is a long-term increase in latent heat flux that dominates the data record. Theglobally averaged latent heat flux increased by roughly9 W m-2between the low in1981 and the peak in2002, which amounted to about a10% increase in the mean value over the25-yr period. Positive linear trends appeared on aglobal scale,and were most significant over the tropical Indian and western Pacific warm pool and the boundary current regions. The increase in latent heat flux was in concert with the rise of sea surface temperature, suggesting a response of the atmosphere to oceanic forcing.

來(lái)源出版物：Bulletin of the American Meteorological Society,2007,88(4): 527-539

被引頻次：443

Satellite remote sensing of total herbaceous biomass production in the Senegalese Sahel:1980–1984

Tucker, CJ; Vanpraet, CL; Sharman, MJ; et al.

Abstract:NOAA-6 and NOAA-71-km and 4-km advanced very high resolution radiometer data were obtained at frequent intervals during the1980,1981,1982,1983, and1984 rainy orgrowing seasons in the Sahel zone of northern Senegal. Above-ground herbaceous biomass clippings, visual estimates, and hand-held radiometer measurements of herbaceous vegetation were made during and at the conclusion of the rainy seasons for 4 of the 5 years. The satellite data were compared to sampled aboveground biomass data and the integral of the satellite data over time was compared to end-of-growing-season aboveground total dry biomass. A strong correlation between the integrated NOAA-7 satellite data and end-of-season aboveground dry biomass was found forground samples collected over a3-year period. The satellite data documented the highly variable precipitation regime in the Senegalese Sahel both within years and among years and suggest a direct method of monitoring Sahelian total herbaceous biomass production in areas where the percentage cover of woody species is less than10%.Predicted average total dry biomass production was1093 kg/ha for1981, 536 kg/ha for1982,178 kg/ha in1983,and 55 kg/ha in1984 for the ～30000km2study area.

來(lái)源出版物：Remote Sensing of Environment,1985,17(3):233-249

被引頻次：422

Overview of Arctic cloud and radiation characteristics

Curry, JA; Rossow, WB; Randall, D; et al.

Abstract:To provide a background for ARM’s activities at the North Slope of Alaska/Adjacent Arctic Ocean sites,an overview isgiven of our current state of knowledge of Arctic cloud and radiation properties and processes. The authors describe the Arctic temperature and humidity characteristics, cloud properties and processes, radiative characteristics of the atmosphere and surface, direct and indirect radiative effects of aerosols, and the modeling and satellite remote sensing of cloud and radiative characteristics. An assessment isgiven of the current performance of satellite remote sensing and climate modeling in the Arctic as related to cloud and radiation issues. Radiation-climate feedback processes are discussed, and estimates are made of the sign and magnitude of the individual feedback components. Future plans to address these issues are described.

來(lái)源出版物：Journal of Climate,1996,9(8):1731-1764

被引頻次：381

Evaluation of1D and2D numerical models for predicting river flood inundationHorritt, MS; Bates, PD

Abstract:1D and2D models of flood hydraulics(HEC-RAS, LISFLOOD-FP and TELEMAC-2D) are tested on a 60km reach of the river Severn, UK. Synoptic views of flood extent from radar remote sensing satellites have been acquired for flood events in1998 and2000. The three models are calibrated, using floodplain and channel friction as free parameters, against both the observed inundated area and records of downstream discharge. The predictive power of the models calibrated against inundation extent or discharge for one event can thus be measured using independent validation data for the second. The results show that for this reach both the HEC-RAS and TELEMAC-2D models can be calibrated against discharge or inundated area data andgivegood predictions of inundated area, whereas the LISFLOOD-FP needs to be calibrated against independent inundated area data to produce acceptable results. The different predictive performances of the models stem from their different responses to changes in friction parameterisation.

關(guān)鍵詞：flood forecasting; modelling; calibration;validation; remote sensing

來(lái)源出版物：Journal of Hydrology,2002,268(1):87-99

被引頻次：358

A local ensemble Kalman filter for atmospheric data assimilation

Ott, E; Hunt, BR; Szunyogh, I; et al.

Abstract:In this paper, we introduce a new. local formulation of the ensemble Kalman filter approach for atmospheric data assimilation. Our scheme is based on the hypothesis that, when the Earth’s surface is divided up into local regions of moderate size. vectors of the forecast uncertainties in such regions tend to lie in a subspace of much lower dimension than that of the full atmospheric state vector of such a region. Ensemble Kalman filters, ingeneral, take the analysis resulting from the data assimilation to lie in the same subspace as the expected forecast error. Under our hypothesis the dimension of the subspace corresponding to local regions is low. This is used in our scheme to allow operations only on relatively low-dimensional matrices. The data assimilation analysis is performed locally in a manner allowing massively parallel computation to be exploited. The local analyses are then used to constructglobal states for advancement to the next forecast time. One advantage, which may take on more importance as ever-increasing amounts of remotely-sensed satellite data become available, is the favorable scaling of the computational cost of our method with increasing data size, as compared to other methods that assimilate data sequentially. The method, its potential advantages, properties, and implementation requirements are illustrated by numerical experiments on the Lorenz-96 model. It is found that accurate analysis can be achieved at a cost which is very modest compared to that of a fullglobal ensemble Kalman filter.

來(lái)源出版物：Tellus A,2004, 56(5): 415-428

A new algorithm for surface deformation monitoring based on small baseline differential SAR interferograms

Berardino, P; Fornaro,g; Lanari, R; et al.

We present a new differential synthetic aperture radar (SAR) interferometry algorithm for monitoring the temporal evolution of surface deformations. The presented technique is based on an appropriate combination of differential interferograms produced by data pairs characterized by a small orbital separation (baseline) in order to limit the spatial decorrelation phenomena. The application of the singular value decomposition method allows us to easily “l(fā)ink” independent SAR acquisition datasets, separated by large baselines, thus increasing the observation temporal sampling rate. The availability of both spatial and temporal information in the processed data is used to identify and filter out atmospheric phase artifacts. We present results obtained on the data acquired from1992 to2000 by the European Remote Sensing satellites and relative to the Campi Flegrei caldera and to the city of Naples, Italy that demonstrate the capability of the proposed approach to follow the dynamics of the detected deformations.