Distances between cities acting as national midpoints in the European system 1816-1980

<p>Measurement of distances between European states in the period 1816-1980. These distances were used as system parameters for a model of European power relations during this period. The distances were obtained by applying trigonometric calculation to the spherical coordinates of cities acting as national midpoints.</p>本数据集涵盖1816年至1980年欧洲各国间的距离测算结果。该距离数据被用作同期欧洲大国权力关系模型的系统参数，其测算方式为对作为各国地理中心的城市的球坐标开展三角运算。