Ortho Seam Lines with Photo Exposure Dates - 2021 Imagery

In 2021, on behalf of the North Carolina Center for Geographic Information and Analysis four contractors captured 6-inch pixel 4-band (RGB-IR) orthoimagery for the 26 Eastern Piedmont counties in North Carolina. These contractors are Spatial Data Consultants, Inc., Sanborn Map Company, Atlas Geographic Data, and Surdex Corporation. This file documents the mosaic of the imagery exposures and associated seamlines used to generate the collection of imagery by the contractors for the entire study area of North Carolina for the following counties , Bladen, Chatham, Cumberland, Durham, Edgecombe, Franklin, Granville, Halifax, Harnett, Hoke, Johnston, Lee, Moore, Nash, Northampton, Orange, Person, Richmond, Robeson, Sampson, Scotland, Vance, Wake, Warren, Wayne, Wilson; and the date each exposure was flown. Seamlines were converted to polygon shapefile format, checked for gaps and overlaps, attributed, and trimmed to the study area boundary. This dataset contains a polygon seamline index attributed with, Exposure date the season. These attributes were based on information collected from individual frames and from flight line datasets. This seamline dataset was created to identify the individual exposure frames and the seamlines that join these exposures together to generate the orthoimagery product for the Eastern Piedmont Orthoimagery 2021 Project (EP21). The purpose of this dataset derives information from the exploitation flight lines to provide the specific dates of imagery acquisition for each image frame.2021年，北卡罗来纳州地理信息与分析中心（North Carolina Center for Geographic Information and Analysis）委托四家承包商，为该州东部皮埃蒙特地区的26个县采集了像素分辨率为6英寸的四波段（RGB-IR，红-绿-蓝-红外）正射影像（orthoimagery）。四家承包商分别为Spatial Data Consultants, Inc.、Sanborn Map Company、Atlas Geographic Data以及Surdex Corporation。本文件记录了针对北卡罗来纳州以下各县组成的完整研究区域，由承包商生成的影像曝光拼接成果及配套接缝线（seamlines）：布莱登县（Bladen）、查塔姆县（Chatham）、坎伯兰县（Cumberland）、达勒姆县（Durham）、埃奇库姆县（Edgecombe）、富兰克林县（Franklin）、格兰维尔县（Granville）、哈利法克斯县（Halifax）、哈尼特县（Harnett）、霍克县（Hoke）、约翰斯顿县（Johnston）、李县（Lee）、穆尔县（Moore）、纳什县（Nash）、北安普顿县（Northampton）、奥兰治县（Orange）、佩尔森县（Person）、里士满县（Richmond）、罗布森县（Robeson）、桑普森县（Sampson）、苏格兰县（Scotland）、万斯县（Vance）、韦克县（Wake）、沃伦县（Warren）、韦恩县（Wayne）、威尔逊县（Wilson）；同时记载了每一次影像曝光的飞行日期。接缝线已被转换为多边形形状文件（polygon shapefile）格式，并完成了间隙与重叠检查、属性赋值，且裁剪至研究区域边界。本数据集包含带有属性信息的多边形接缝线索引，其属性涵盖曝光日期与季节。上述属性信息均源自单张影像帧与飞行航线数据集。该接缝线数据集旨在识别各个影像曝光帧，以及用于将这些曝光帧拼接为2021年东部皮埃蒙特正射影像项目（Eastern Piedmont Orthoimagery 2021 Project，EP21）所需正射影像产品的接缝线。本数据集的核心用途是从航拍飞行航线数据中提取信息，为每一张影像帧提供具体的影像获取日期。