Bird density and marine mammal counts based on 7700 meter bins in southern California, 1999-2002
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Tracklines and associated observations were mapped and analyzed using ArcMap (ESRI, Redlands, CA). GPS data were recorded in NAD27 map datum and projected to an USGS...
使用ArcMap（ESRI，加利福尼亚州雷德兰兹市）对轨迹线（Tracklines）及相关观测数据进行了制图与分析。GPS数据以北美大地基准27（NAD27）为地图基准进行记录，并投影至美国地质调查局（USGS）……
