Alaska coastal orthoimagery and elevation data: Icy Cape to Cape Prince of Wales, 2016

This data release presents orthoimagery and elevation data based on aerial imagery of the Alaska coastline between Icy Cape and Cape Prince of Wales. These data products and the source aerial imagery were generated by Fairbanks Fodar for the U.S. Geological Survey. Aerial imagery was collected in 2016 between August 29 and September 4 and extends from the shoreline to 400-4000 meters inland. Photographs were captured using a Nikon D800E mounted on a Cessna 170B. Data products were derived from aerial images and precise Global Positioning System (GPS) navigation data using structure-from-motion (SfM) techniques. This dataset includes point cloud data in LAZ format as well as orthoimagery and digital elevation models presented as Cloud Optimized Geotiffs (COGs) with 10-20 cm cell size. Users are encouraged to use the Tile Index shapefile to identify orthoimagery and/or elevation data files that are appropriate to a specific area of interest. The Tile Index shapefile provides an outline of the data in each orthoimagery and elevation data file as well as the name of the file. Once the appropriate filenames are identified, users can either download files to their local server or stream the Cloud Optimized Geotiff directly to any COG-supporting GIS.

本数据集发布内容包含基于冰角（Icy Cape）至威尔士王子角（Cape Prince of Wales）间阿拉斯加海岸线航空影像生成的正射影像（orthoimagery）与高程数据。本数据集的各类产品及原始航空影像均由Fairbanks Fodar为美国地质调查局（U.S. Geological Survey）制作完成。航空影像采集于2016年8月29日至9月4日，覆盖范围从海岸线向内陆延伸400至4000米。影像采集工作由搭载于塞斯纳170B（Cessna 170B）飞机上的尼康D800E（Nikon D800E）相机完成。数据集产品基于航空影像与高精度全球定位系统（Global Positioning System, GPS）导航数据，通过运动恢复结构（structure-from-motion, SfM）技术生成。本数据集包含LAZ格式的点云数据，以及分辨率为10至20厘米的云优化地理TIFF（Cloud Optimized Geotiffs, COGs）格式正射影像与数字高程模型（digital elevation models）。建议用户通过瓦片索引形状文件（Tile Index shapefile）检索匹配特定研究区域需求的正射影像及高程数据文件。该瓦片索引形状文件会提供每个正射影像与高程数据文件的覆盖范围轮廓及对应文件名。确认所需文件名后，用户既可将文件下载至本地服务器，也可直接将云优化地理TIFF（COG）数据流接入任意支持COG格式的地理信息系统（GIS）。