“Here be dragons”is what the medieval mapmakers mark on terra incognita,unknown territories,to signify their mysterious and,more importantly,promising nature.It seems odd to suggest that there are still unknown terr...“Here be dragons”is what the medieval mapmakers mark on terra incognita,unknown territories,to signify their mysterious and,more importantly,promising nature.It seems odd to suggest that there are still unknown territories in the field of microbiology,after more than a hundred years of research,and especially the acceleration brought by high-throughput sequencing and related omics approaches in the last two decades.Yet,owing to the vast diversity of microbes,it is estimated that we have probably only cataloged fewer than1%of viruses,bacteria,and fungal species,and even less in their genetic diversities[1].The current third wave of artificial intelligence(AI),which brings new paradigms into medicine,economics,industry,and of course biology,offers a new wagon for the exploration of the unknown territories,once we are aware of where they are.展开更多
论文利用2005年Terra/MODIS卫星8天合成的250m地表反射率数据(MODIS Terra Sur-face Reflectance 8-Day L3 Global 250 m:MOD09Q1)构建的时间序列数据集,通过计算NDVI指数,结合典型地物的谱间特征,并借助SRTM数字高程数据,采用...论文利用2005年Terra/MODIS卫星8天合成的250m地表反射率数据(MODIS Terra Sur-face Reflectance 8-Day L3 Global 250 m:MOD09Q1)构建的时间序列数据集,通过计算NDVI指数,结合典型地物的谱间特征,并借助SRTM数字高程数据,采用多源信息提取的方法对洞庭湖地区2005年水域面积变化进行了动态监测。结合Terra/MODIS数据特点,提出了全年最大淹没时间指数的概念,并通过对该指数的构建,完成了对洞庭湖地区重点水域的淹没风险评价。结果表明:①文中提出的基于Terra/MODIS MOD09Q1数据的多源信息水体提取方法,通过更高空间分辨率ENVISAT/ASAR数据以及水文测站水位数据的检验表明,是切实可行的;②2005年洞庭湖地区水域面积变化特征总体表现为,在11-4月份期间水域面积较小,而在5-10月份期间较大。其中,4月份最小,9月份最大,两者相差了几乎1.5倍,受地区季节性降雨的年内分布规律及长江主汛期的影响显著;③通过全年最大淹没时间指数的计算发现,占研究区总面积84.13%的年内持久陆地和持久水域区域,基本上没有防洪压力,而剩余的15.87%的年内变化水域,由于潜在淹没风险的存在,则需要抗洪防险部门进行重点防控;④文中多源信息水面提取方法的实现以及全年最大淹没时间指数概念的提出,为今后更加深入地探讨三峡工程建成运营对洞庭湖地区水域变化以及江湖关系的影响奠定了基础。展开更多
基金supported by the National Key Research and Devel-opment Program of China(grant number 2022YFC2303200)the Beijing Natural Science Foundation(grant number JQ22017).
文摘“Here be dragons”is what the medieval mapmakers mark on terra incognita,unknown territories,to signify their mysterious and,more importantly,promising nature.It seems odd to suggest that there are still unknown territories in the field of microbiology,after more than a hundred years of research,and especially the acceleration brought by high-throughput sequencing and related omics approaches in the last two decades.Yet,owing to the vast diversity of microbes,it is estimated that we have probably only cataloged fewer than1%of viruses,bacteria,and fungal species,and even less in their genetic diversities[1].The current third wave of artificial intelligence(AI),which brings new paradigms into medicine,economics,industry,and of course biology,offers a new wagon for the exploration of the unknown territories,once we are aware of where they are.
文摘论文利用2005年Terra/MODIS卫星8天合成的250m地表反射率数据(MODIS Terra Sur-face Reflectance 8-Day L3 Global 250 m:MOD09Q1)构建的时间序列数据集,通过计算NDVI指数,结合典型地物的谱间特征,并借助SRTM数字高程数据,采用多源信息提取的方法对洞庭湖地区2005年水域面积变化进行了动态监测。结合Terra/MODIS数据特点,提出了全年最大淹没时间指数的概念,并通过对该指数的构建,完成了对洞庭湖地区重点水域的淹没风险评价。结果表明:①文中提出的基于Terra/MODIS MOD09Q1数据的多源信息水体提取方法,通过更高空间分辨率ENVISAT/ASAR数据以及水文测站水位数据的检验表明,是切实可行的;②2005年洞庭湖地区水域面积变化特征总体表现为,在11-4月份期间水域面积较小,而在5-10月份期间较大。其中,4月份最小,9月份最大,两者相差了几乎1.5倍,受地区季节性降雨的年内分布规律及长江主汛期的影响显著;③通过全年最大淹没时间指数的计算发现,占研究区总面积84.13%的年内持久陆地和持久水域区域,基本上没有防洪压力,而剩余的15.87%的年内变化水域,由于潜在淹没风险的存在,则需要抗洪防险部门进行重点防控;④文中多源信息水面提取方法的实现以及全年最大淹没时间指数概念的提出,为今后更加深入地探讨三峡工程建成运营对洞庭湖地区水域变化以及江湖关系的影响奠定了基础。