Calibration and equifinality in terrestrial spectroradiometric imaging

地面光谱辐射成像中的校准和等效性

• 批准号: 92768-2007
• 负责人: Teillet, Philippe
• 金额: $ 1.6万
• 依托单位: University of Lethbridge
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=364946
• 关键词: Calibration; equifinality; terrestrial; spectroradiometric; imaging

The increasingly numerous and diverse Earth observation satellite systems can contribute information of significant value, provided developments in the physical underpinnings keep pace.  A major challenge with these systems is to ensure that similar measurements by different sensor systems under different observational conditions yield physically consistent and accurate geophysical and biophysical data.  The first research theme explores the feasibility of a new coordinated satellite imaging sensor calibration capability based on a global network of approximately six ground-based benchmark test sites.  The concept is to standardize on a core set ground instruments and measurement protocols across all sites and to have the measurements undergo identical processing.  Such a network will provide calibration data for all optical satellite systems currently in operation, reduce significantly the effort required by individual agencies, and provide consistency for studies involving multiple satellites.  The proof-of-concept research will be carried out at Railroad Valley Playa, Nevada.  The second research theme considers whether there exists a unique relationship between vegetation canopy architecture and the canopy's reflectance as a function of observation angle.  Digital imaging spectrometers will be used at ground level to acquire high-spatial-resolution spectral image data as a function of angle over crop canopies in order to investigate at what spatial scale the angular signatures reach those observed by a satellite imaging sensor.  The research is designed to improve canopy reflectance models used with satellite image data in operational crop monitoring.  The proof-of-concept research will be carried out for potatoes and sugar beets in Southern Alberta.  Overall, the proposed research is intended to improve the accuracies of change detection in resource monitoring applications and guide the directions of new remote sensing research efforts.

地球观测卫星系统的数量和种类日益增多，可提供具有重要价值的信息，这些系统的一个主要挑战是确保不同传感器系统在不同观测条件下进行的类似测量产生物理一致和准确的地球物理和生物物理数据。第一个研究主题探讨了新的协调一致的地球物理和生物物理数据的可行性。卫星成像传感器校准能力建立在一个由大约六个地面基准测试站组成的全球网络的基础上。其概念是在一套核心的地面仪器和测量协议的基础上对所有站点进行标准化，并使测量结果经过相同的处理。这样一个网络将为目前正在运行的所有光学卫星系统提供校准数据，大大减少各个机构所需的工作量，并为涉及多颗卫星的研究提供一致性。概念验证研究将在铁路谷普拉亚进行，内华达州。第二个研究主题考虑植被冠层结构与冠层反射率之间是否存在独特的关系，作为观察角度的函数。数字成像光谱仪将在地面使用，以获取高空间分辨率，利用高分辨率光谱图像数据作为作物冠层角度的函数，研究在什么样的空间尺度上，作物冠层的角度特征能够达到卫星图像传感器观测到的角度特征。本研究旨在改进作物冠层反射率模型，并将其应用于作物监测业务中。概念研究将在南阿尔伯塔省的马铃薯和甜菜上进行。总体而言，拟议的研究旨在提高资源监测应用中变化检测的准确性，并指导新的遥感研究工作的方向。