Orthophotography of the Autonomous Community of the Basque Country. Years 1977/78

Orthoimage of the Autonomous Community of the Basque Country in 1977-1978, generated from the national black and white photogrammetric flight commissioned by the Ministries of Agriculture, Defence, Finance and the Geographical and Catastral Institute (now National Geographical Institute). Black and white frames at 1:18.000 scale. Pixel size (GSD) between 45 cm and 27 cm, depending on areas.1977-1978年巴斯克自治区（Autonomous Community of the Basque Country）正射影像（Orthoimage），由农业、国防、财政三部及地理与地籍研究院（现国家地理研究院）委托实施的全国黑白摄影测量飞行所获取的数据生成。该数据集采用1:18000比例尺的黑白航片制作，像素尺寸（地面采样距离，GSD, Ground Sample Distance）介于45厘米至27厘米之间，具体数值因区域而异。