2015 Unmanned aerial system (UAS)-derived orthoimage mosaics and digital terrain models of the SE lava flow margin, Holuhraun lava flow-field, Vatnajökull National Park, Iceland

Using a Phantom 3 Pro imaging system, aerial images were acquired over a short section of the SE Holuhraun lava flow margin, adjacent interior and adjacent river systems. Images were initially geocoded using the device's onboard GPS and a ground control points (GCPs) network. Final products were coregistered to more precise geocoded image data collected later in 2016. Images were processed into geodetically-controlled digital terrain models (DTMs) and orthomosaics using the commercial software package Pix4Dmapper Pro version 2.0.81. In Pix4Dmapper Pro, data products were geocoded by attributing the 3D coordinates of geocoded image coregistration targets to corresponding pixels in a subset of 2D images. The 2016 image data used for coregistration utilized DGPS measurements. To estimate the localization accuracy, we used a network of N = 7 coregistration points; the resulting mean of the root mean square error (RMSE) of x, y, and z directions (i.e., latitude, longitude, and elevation) is 10.6 cm. Both the DTM and orthomosaic products have a spatial resolution of 2 cm/pixel, but the DTM has an effective resolution of ~4 cm/pixel.Topic Categories (ISO 19115)elevation, geoscientificinformation, imageryBaseMapsEarthCoverFeature and Attribute DefinitionsA georeferenced raster displaying elevation data generated from digital camera image data using multi-view stereophotogrammetry methods.Date of Content2015-08-24For inquiries regarding the contents of this dataset, please contact the Corresponding Author listed in the README.txt file. Administrative inquiries (e.g., removal requests, trouble downloading, etc.) can be directed to [e-mail] item is part of Unmanned aerial system (UAS)-derived orthoimage mosaics and digital terrain models of the northeastern portion of the Holuhraun lava flow-field, Iceland

运用 Phantom 3 Pro 成像系统，对冰岛霍卢赫拉恩熔岩流边缘的局部区域、相邻内陆及相邻河系进行了空中影像采集。初始阶段，图像通过设备内置的 GPS 和地面控制点（GCPs）网络进行地理编码。最终产品与2016年后期收集的更精确的地理编码图像数据进行配准。利用商业软件包 Pix4Dmapper Pro 版本 2.0.81 对图像进行处理，生成以大地测量控制的数字地形模型（DTM）和正射影像图。在 Pix4Dmapper Pro 中，数据产品通过将地理编码图像配准目标的3D坐标分配给2D图像子集中的相应像素进行地理编码。用于配准的2016年图像数据采用了差分全球定位系统（DGPS）测量。为了估算定位精度，我们使用了N=7的配准点网络；x、y、z方向（即纬度、经度和高程）的均方根误差（RMSE）的平均值为10.6厘米。DTM和正射影像图产品具有2厘米/像素的空间分辨率，但DTM的有效分辨率为约4厘米/像素。主题分类（ISO 19115）：高程、地质信息、影像、基础地图、地表特征及其属性定义：以多视立体摄影测量方法从数码相机图像数据生成的地理参照栅格数据，显示高程信息。内容日期：2015-08-24。有关本数据集内容的查询，请联系README.txt文件中列出的对应作者。行政查询（例如，删除请求、下载问题等）可发送至[e-mail]。此项目是冰岛霍卢赫拉恩熔岩流东北部无人机系统（UAS）衍生的正射影像图拼合和数字地形模型的一部分。