Utilizing UAV-based photogrammetry to develop a 3D Model of IITGN

At Indian Institute of Gandhinagar (IITGN), Gujarat, India, a half semester 2 credit course was taught on drone data acquisition, processing, and interpretation during March-April 2024. The class project was to collect drone imagery of the entire IITGN campus, approximately 1.96 km2 in area. This dataset has been collected and processed by the 28 students who enrolled in the class. The survey was conducted with a Quadcopter equipped with a 48 MPX camera. During the data acquisition, a total of >4,100 photographs with 70% overlap were collected with an average altitude of 105m. The aerial imagery was stitched utilizing the Structure from Motion (SfM) technique (Agisoft) to develop the 3D Digital Outcrop Model (DOM). Six individual models were developed for the entire IITGN campus that has been stitched into a single model. The final IITGN 3D model has a ground resolution of 2.21 cm/pix. Ground control points (GCPs) were collected before the survey that has been utilized to georeference the model. This dataset provides an orthophotograph (5.2 cm/pix) as well as a 3D model (.bin) of the entire IITGN campus.印度甘地纳加德印度理工学院（Indian Institute of Gandhinagar, IITGN）位于印度古吉拉特邦，该院校于2024年3月至4月开设了一门半学期、2学分的无人机数据采集、处理与解译课程。本次课程项目的任务为采集整个IITGN校区的无人机影像，校区总面积约1.96平方千米。该数据集由选修该课程的28名学生共同采集并完成处理。 本次调查采用搭载48 MPX相机的四旋翼无人机开展，数据采集阶段共获取超过4100张重叠度为70%的航空影像，平均飞行高度为105米。 研究团队借助运动恢复结构（Structure from Motion, SfM）技术，使用Agisoft软件对采集到的航空影像进行拼接，以生成三维数字露头模型（3D Digital Outcrop Model, DOM）。针对整个IITGN校区先后生成6个独立模型，随后将其拼接为单一整体模型。最终生成的IITGN三维模型地面分辨率为2.21厘米/像素。 本次调查开展前已采集地面控制点（Ground Control Points, GCPs），用于对该模型进行地理配准。 本数据集包含整个IITGN校区的正射影像（分辨率5.2厘米/像素）以及.bin格式的三维模型文件。