Hyperspectral sensing of arctic vegitation communities

1999年，Paul Treitz博士获得了加拿大创新基金会(CFI)的拨款，购买了一台地面光谱辐射计。该光谱辐射计记录电磁光谱的可见光、近红外和短波红外区的光谱反射率。植被光谱反射率与植被生理(即叶绿素浓度、胁迫、含水率等)密切相关。该仪器使我们能够表征不同植被群落的反射率特性，以便与卫星反射率进行比较。通过这种方式，我们可以确定来自卫星传感器的光谱信息，这对于识别不同的植被群落及其状况是最佳的。随着加拿大北极持续变暖，我们能够监测植被反应至关重要。据了解，通过CFI购买的Analytical Spectral Devices光谱辐射仪现在已经有八年的历史，在设计、电子和计算机集成方面已经过时。尽管在过去的几年里，为了保持系统的有效运行，已经进行了一些修改，但要在不影响光谱测量的完整性的情况下进行这些修改变得越来越困难。更重要的是，这个装置不适合在寒冷的环境中作业。这个应用程序是为了获得资金来升级这个装置，这样我们就可以用它来收集北极环境中的地面光谱。这对于更有效地了解北极植物群落的反射率对于绘制和监测这些生态系统的变化是必要的。我的研究项目的老师和学生将使用这个仪器来解决与北极植物群落分类和反射特征提取相关的研究问题，方法是收集加拿大北极地区各站点的综合植被群落光谱。这类精密仪器的使用为从事遥感和地球系统科学工作的学生提供了宝贵的经验和专业知识。

In 1999, Dr. Paul Treitz was awarded a Canada Foundation for Innovation (CFI) grant to purchase a ground-based spectroradiometer. This spectroradiometer records spectral reflectance across the visible, near-infrared and shortwave infrared regions of the electromagnetic spectrum. Vegetation spectral reflectance is closely related to the physiology of vegetation (i.e., chlorophyll concentration, stress, water content, etc.). This instrument allows us to characterize the reflectance properties of different vegetation communities for comparison to satellite reflectance. In this manner we can determine the spectral information from satellite sensors which is optimal for identifying different vegetation communities and their condition. As the Canadian Arctic continues to warm, it is critical that we be able to monitor vegetation response.     The Analytical Spectral Devices Spectroradiometer purchased through CFI is now eight years old and out-dated in terms of its design, electronics and computer integration. Although a number of modifications have been made to keep the system operating effectively over the last few years, it is getting more difficult to make these modifications without impacting the integrity of the spectral measurements. More importantly, this unit is not fitted for operations in cold environments. This application is for funds to have this unit upgraded so that we can use it to collect ground-based spectra in arctic environments. This is necessary to more effectively understand arctic plant community reflectance for mapping and monitoring changes in these ecosystems.     Faculty and students in my research program will use this instrument to address research questions related to arctic plant community classification and reflectance feature extraction through collection of integrated vegetation community spectra at sites in the Canadian Arctic. Access to this type of sophisticated instrumentation provides valuable experience and expertise to students pursuing careers in remote sensing and earth system science.