Orthorectified Images for Circular Scanline Fracture Analysis, Parmelan, France

Orthorectified images from fracture networks in Lower Cretaceous carbonates of the Parmelan, France. The outcrop is used as an analogue to a fractured geothermal reservoir in the Geneva Basin. <br>UAV missions with a Mavic 3 were executed June 2024. The photos taken during the missions are the input for modelling with Agisoft Metashape to create the orthorectified images. They are georeferenced in UTM 32N framework. Each image is accompanied by a *.tfw with the same name. Please get in contact if the original photos are needed.<br>In the paper 'A Fracture Never Comes Alone: Associations of Fractures and Stylolites in Analogue Outcrops Improve Borehole Image Interpretations of Fractured Carbonate Geothermal Reservoirs', the location of the orthoimages is displayed in figure 4. Field observation in the form of circular scanlines are compared with data derived from the orthoimages, to evaluate the importance of ground measurements compared to UAV-derived data. On the images, targets (orange, green or red markers) indicate the locality where circular scanlines with radius of 1 meter are taken.<br>

本数据集包含法国帕尔默兰（Parmelan）地区下白垩统碳酸盐岩（Lower Cretaceous carbonates）裂缝网络（fracture networks）的正射校正影像（orthorectified images）。该露头（outcrop）被用作日内瓦盆地（Geneva Basin）裂缝型地热储层的类比研究原型。
本次无人机航拍任务采用Mavic 3无人机，于2024年6月执行。任务采集的照片将作为Agisoft Metashape建模的输入数据，用于生成正射校正影像。所有影像均采用通用横轴墨卡托（UTM）32N坐标系完成地理配准。每张影像均附带同名的*.tfw世界文件。若需获取原始照片，请与数据集提供方联系。
在论文"A Fracture Never Comes Alone: Associations of Fractures and Stylolites in Analogue Outcrops Improve Borehole Image Interpretations of Fractured Carbonate Geothermal Reservoirs"中，图4展示了本次正射影像的布设位置。研究团队将以圆形扫描线形式开展的野外实测数据，与从正射影像中提取的对应数据进行对比，以评估地面测量与无人机航拍数据的相对重要性。影像上的橙色、绿色或红色标记靶标，即为半径1米的圆形扫描线的布设点位。