Cartography BTA 1:5,000 (reference year 2017). Middle-level curve of the northern half of Navarre

Layer of the BTA (reference year 2017) containing the normal curves at 5 meters of equidistance of the northern half of the territory of Navarre on a 1:5,000 scale. The BTA is an adaptation to the production of the National Cartographic Base (BCN) of the National Geographical Institute (IGN). BTA is the acronym for “Harmonised Topographical Base”. It is a data model agreed by the Autonomous Communities (CCAA) and approved by the Higher Geographical Council (CSG) of which there is a version v1 dated 2008.本数据集为统一地形基准（Harmonised Topographical Base，简称BTA）图层，参考年份为2017，涵盖比例尺1:5000的纳瓦拉自治区北部辖区内的5米等距标准等高线。BTA是西班牙国家地理研究所（Instituto Geográfico Nacional，简称IGN）针对国家制图基准（Base Cartográfica Nacional，简称BCN）的生产适配版本。该数据模型由西班牙各自治区（Comunidades Autónomas，简称CCAA）协商确立，并经西班牙高级地理委员会（Consejo Superior Geográfico，简称CSG）批准，其首个版本v1发布于2008年。