Georectification of IKONOS image, January 2004, Heard Island

NOTE - this record has been superseded by "SIC_266_267_ortho", which describes a more recent orthorectification of the same two images.Two IKONOS 2004 images (SIC 266 and 267) were chosen as the base images for the AAS2939 change detection project. The reason for choosing these images where that they were the earliest very high resolution (VHR) image with the least amount of cloud cover for which DGPS GCPs are available and identified on the image by Jenny Scott. The importance of having a base image to register all other images to is to allow change detection between images.The 2004 IKONOS image was resampled to a 0.6m resolution, in order to match the resolution of the Quickbird images (for future rectification and change detection).

备注：本数据集记录已由"SIC_266_267_ortho"取代，该数据集针对同一两幅图像提供了更新后的正射校正结果。本AAS2939变化检测项目选取了2004年拍摄的两幅IKONOS影像（SIC 266与SIC 267）作为基准影像。选用该组影像的原因在于，它们是当前可获取的最早的超高分辨率（Very High Resolution, VHR）影像，且云量最少，同时配备了差分全球定位系统（Differential Global Positioning System, DGPS）地面控制点（Ground Control Points, GCPs），并已由珍妮·斯科特（Jenny Scott）在影像上完成标注。将基准影像用于配准其余所有影像的核心目的，在于实现不同影像间的变化检测。为匹配Quickbird影像的分辨率以支持后续的正射校正与变化检测任务，研究人员将2004年的IKONOS影像重采样至0.6米分辨率。