Cartography BTA 1:5,000 (reference year 2017). Master level curve

Layer of the BTA (reference year 2017) containing the master curves at 25 meters of equidistance, steep and slopes for the entire 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.本数据集为基准年2017年的统一地形基础底图（Harmonised Topographical Base，简称BTA）图层，涵盖纳瓦拉全境1:5000比例尺下、间距25米的主等高线、陡坡及坡度数据。BTA是适配西班牙国家地理研究所（National Geographical Institute，简称IGN）国家制图基准（National Cartographic Base，简称BCN）的生产成果。BTA为“统一地形基础底图（Harmonised Topographical Base）”的缩写。该数据模型由西班牙各自治区（Autonomous Communities，简称CCAA）共同商定，并经西班牙高等地理委员会（Higher Geographical Council，简称CSG）批准，目前已推出2008年发布的v1版本。