Cartography BTA 1:5,000 (reference year 2014). Master level curve Cartography BTA 1:5,000 (reference year 2014). Master level curve Cartography BTA 1:5,000 (reference year 2014). Master level curve

Layer of the BTA (reference year 2014) 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.