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

Using a Phantom 3 Pro imaging system, aerial images were acquired over short section of the NE 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 2.7 cm. Both the DTM and orthomosaic products have a spatial resolution of 4 cm/pixel, but the DTM has an effective resolution of ~16 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 Content2015-09-04For 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

采用Phantom 3 Pro成像系统，对NE Holuhraun熔岩流边缘的局部区域及其相邻内陆河流系统进行了航空摄影。图像最初通过设备内置的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核心注册。图像经过处理，使用商业软件包Pix4Dmapper Pro版本2.0.81生成地球测量控制的数字地面模型（DTMs）和正射影像图。在Pix4Dmapper Pro中，通过将地理编码图像核心注册目标的三维坐标分配给二维图像子集中的相应像素，对数据产品进行地理编码。用于核心注册的2016年图像数据利用了差分全球定位系统（DGPS）测量。为了估计定位精度，我们使用了N = 7个核心注册点网络；x、y和z方向（即纬度、经度和高程）的均方根误差（RMSE）的平均值为2.7厘米。DTM和正射影像图产品具有4厘米/像素的 spatial resolution，但DTM的有效分辨率为约16厘米/像素。主题类别（ISO 19115）：高程、地球科学信息、影像、基础地图、地表特征及其属性定义：通过多视图立体摄影测量方法，从数码相机图像数据中生成的地理参照栅格，显示高程数据。内容日期：2015-09-04。有关此数据集内容的查询，请联系README.txt文件中列出的对应作者。行政询问（例如，删除请求、下载问题等）可发送至[e-mail]。本项属于冰岛Holuhraun熔岩流东北部无人驾驶飞行器（UAS）衍生的正射影像图镶嵌和数字地面模型。