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: 2008
• 资助国家: 加拿大
• 起止时间: 2008-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=390787
• 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越来越多，种类越来越多，只要物理基础方面的发展跟上步伐，就可以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上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在由大约六个地面基准试验场组成的全球网络的基础上建立新的协调卫星成像传感器校准能力的可行性。 其概念是在所有地点的核心地面仪器和测量协议上实现标准化，并使测量结果经过相同的处理。 这样一个网络将为目前运行的所有光学卫星系统提供校准数据，大大减少各机构所需的工作，并为涉及多颗卫星的研究提供一致性。 概念验证研究将在内华达州的Railroad Valley Playa进行。 第二个研究主题考虑植被冠层结构和冠层反射率之间是否存在独特的关系，作为观测角度的函数。 将在地面使用数字成像光谱仪，以获取作物冠层上方随角度变化的高空间分辨率光谱图像数据，以便调查角度特征在多大的空间尺度上达到卫星成像传感器所观测到的角度特征。 该研究旨在改进用于作物监测业务的卫星图像数据的冠层反射率模型。 概念验证研究将在阿尔伯塔南部的土豆和甜菜上进行。 总体而言，拟议的研究是为了提高资源监测应用中的变化检测的准确性，并指导新的遥感研究工作的方向。