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| 1 | A physics-based atmospheric and BRDF correction for Landsat data over mountainous terrain显示文摘 | Fuqin Li David L.B. Jupp Medhavy Thankappan Leo Lymburner Norman Mueller Adam Lewis Alex Held | 2012 | Remote Sensing of Environment2012，，： | 1 |
| 2 | 桉树树干维管形成层和次生韧皮部热致细胞坏死的定量试验显示文摘桉树(Eucalyptus)树干暴露在森林火灾辐射热中会杀死形成层细胞及其内嵌的再生分生组织,阻止树木萌枝和恢复。目前尚无组织水平的方法来量化热处理对桉树形成层细胞活力的影响。本研究的目标包括:(1)采用并验证四氮唑还原法检测桉树细胞活力;(2)应用该方法确定斜叶桉(Eucalyptus oblique)形成层细胞活力的阈值水平,进而确定临界温度。采用四氮唑还原法量化该桉树韧皮部-形成层细胞活力。从斜叶桉成树上切下带有形成层和韧皮部的圆形树皮切片,将质量为1-30 mg不等的样品在20-85℃的温度处理中放置1分钟,并在室温条件下在0.8%的2,3,5-氯化三苯基四氮唑(TTC)中保存20-22小时以检测细胞活力。用乙醇冷萃取得到1,3,5-三苯基四唑甲臜(TPF),在485nm处测定吸光度。结果表明,TTC还原法准确地量化了组织切片(包括维管形成层)中细胞活力随温度升高而下降的情况,并确定60℃为枝树物种形成层-韧皮部细胞的临界温度。细胞活力按[TPF处理温度]/[TPF20℃]计算,在20-85℃之间下降90%.细胞活力结果证实,在50-70℃的温度区间,经过1分钟体外组织加热,桉树的组织坏死显著增加。TTC方法显示细胞活力随温度升高而下降,这与温度处理和中性红染色处理后独立获得的活细胞计数一致。 | Yasika Medhavi Subasinghe Achchige Liubov Volkova Andrew Drinnan Christopher J.Weston | 2021 | Journal of Plant Ecology2021，14，1： | 0 |
| 3 | Issues in the application of Digital Surface Model data to correct the terrain illumination effects in Landsat images显示文摘The accuracy of topographic correction of Landsat data based on a Digital Surface Model(DSM)depends on the quality,scale and spatial resolution of the DSM data used and the co-registration between the DSM and the satellite image.A physics-based bidirectional reflectance distribution function(BRDF)and atmospheric correction model in conjunction with a 1-second DSM was used to conduct the analysis in this paper.The results show that for the examples used from Australia,the 1-second DSM,can provide an effective product for this task.However,it was found that some remaining artefacts in the DSM data,originally due to radar shadow,can still cause significant local errors in the correction.Where they occur,false shadows and over-corrected surface reflectance factors can be observed.More generally,accurate co-registration between satellite images and DSM data was found to be critical for effective correction.Mis-registration by one or two pixels could lead to large errors of retrieved surface reflectance factors in gully and ridge areas.Using low-resolution DSM data in conjunction with high-resolution satellite images will also fail to correct significant terrain components where they occur at the finer scales of the satellite images.DSM resolution appropriate to the resolution of satellite image and the roughness of the terrain is needed for effective results,and the rougher the terrain,the more critical will be the accurate registration. | Fuqin Li David L.B.Jupp Medhavy Thankappan | 2015 | International Journal of Digital Earth2015，8，3： | 0 |
| 4 | Rapid,high-resolution detection of environmental change over continental scales from satellite data–the Earth Observation Data Cube显示文摘The effort and cost required to convert satellite Earth Observation(EO)data into meaningful geophysical variables has prevented the systematic analysis of all available observations.To overcome these problems,we utilise an integrated High Performance Computing and Data environment to rapidly process,restructure and analyse the Australian Landsat data archive.In this approach,the EO data are assigned to a common grid framework that spans the full geospatial and temporal extent of the observations–the EO Data Cube.This approach is pixel-based and incorporates geometric and spectral calibration and quality assurance of each Earth surface reflectance measurement.We demonstrate the utility of the approach with rapid time-series mapping of surface water across the entire Australian continent using 27 years of continuous,25 m resolution observations.Our preliminary analysis of the Landsat archive shows how the EO Data Cube can effectively liberate high-resolution EO data from their complex sensor-specific data structures and revolutionise our ability to measure environmental change. | Adam Lewis Leo Lymburner Matthew B.J.Purss Brendan Brooke Ben Evans Alex Ip Arnold G.Dekker James R.Irons Stuart Minchin Norman Mueller Simon Oliver Dale Roberts Barbara Ryan Medhavy Thankappan Rob Woodcock Lesley Wyborn | 2016 | International Journal of Digital Earth2016，9，1： | 0 |
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