Bathymetric contours of lower Sixmile Creek reservoir, Ithaca, New York, 1938

Water depths for the lower Sixmile Creek reservoir in Ithaca, Tompkins County, N.Y. that were measured during 1938 were found in the files of the GIS Program, City of Ithaca. This agency computed bathymetric elevations and created a bathymetric surface (TIN) of the reservoir. A contour-line shapefile was created from this TIN.1938年测定的纽约州汤普金斯县伊萨卡市下六英里溪水库的水深数据，于伊萨卡市地理信息系统（GIS）项目档案中被发现。该项目组计算了该水库的测深高程，并生成了其测深曲面（TIN，不规则三角网）。基于此不规则三角网，生成了等值线形状文件（shapefile）。