Aerial Photography (Orthophoto) - 2023

2023 Orthophoto - 3 inch resolution: This document describes the processes used to create the orthoimagery data produced for the District of Columbia from 2023 digital aerial photography. It was flown on May 6 and 10, 2023. The aerial imagery acquisition was flown to support the creation of 4-band digital orthophotography with a 3 inch/0.08 meter pixel resolution over the full project area covering the District of Columbia which is approximately 69 square miles. The contractor received waivers to fly in the Flight Restricted Zone (FRZ) and P-56 areas. The ortho imagery was submitted to DC OCTO in GeoTiff/TFW format tiles following the tile scheme provided by OCTO. MrSID and JPEG2000 compressed mosaics were delivered as well using a 50:1 compression ratio.2023年正射影像（Orthophoto）——3英寸分辨率：本文件详述了基于2023年数字航空摄影成果，为哥伦比亚特区制作正射影像数据的全流程。该航空摄影作业于2023年5月6日及10日开展，旨在生成覆盖哥伦比亚特区全域（总面积约69平方英里）的4波段数字正射影像，影像像素分辨率为3英寸/0.08米。承包商已获得在飞行限制区（Flight Restricted Zone，FRZ）及P-56空域开展作业的豁免许可。正射影像按照DC OCTO提供的瓦片分幅规则，以GeoTiff/TFW格式瓦片形式提交至DC OCTO；同时还交付了采用50:1压缩比的MrSID与JPEG2000格式压缩镶嵌影像。