Historic salvage sale locations (1954 - 1974), Andrews Experimental Forest

Historic salvage sale areas (with buffered roads)
Historic salvage timber sales in the H J Andrews from 1954 - 1974 were outlined on a variety of hard copy maps. These manuscripts were digitized into four non-overlapping coverages. Each coverage was turned into a region and the UNION command was used to combine the data into a single coverage of salvage sale regions. The road layer was buffered by 50 yards (45.72 meters)and these areas were added to the coverage.

历史打捞销售区域（含道路缓冲区）
1954年至1974年间，H·J·安德鲁斯（H J Andrews）林区的历史打捞木材销售作业，曾以多种纸质地图进行标注。上述纸质原稿被数字化为四个互不重叠的地理覆盖层（coverage）。将每个覆盖层转换为区域要素，并通过UNION（联合）命令将所有数据合并为一个统一的打捞销售区域覆盖层。随后对道路图层设置50码（45.72米）的缓冲区，并将该缓冲区区域添加至上述覆盖层中。