Hexagonal grid in Flanders, Belgium

As part of the annual partridge spring counts in Flanders, hunters are required to count partridges in all areas that have suitable habitat for partridges (<em>Perdix perdix</em>). Since it is assumed that visibility is around 200 meters, this hexagonal grid with a distance of 400 meters between parallel sides, helps volunteers in choosing observation points.作为法兰德斯（Flanders）年度灰鹧鸪春季普查的一部分，狩猎者需在所有具备灰鹧鸪（*Perdix perdix*）适宜栖息地的区域统计其数量。由于假定观测视野约为200米，这种对边间距为400米的六边形网格可协助志愿者选定观测点位。