4 - Blueline network files

Analysis of the USGS’s blue line network from 7.5’ topographic maps and how these persistent and intermittent stream network length extents compared to the length-duration curves that appear in Lapides et al. (Figure 2). Resources associated with blue line analysis include calculated values for average channel length, shapefiles derived from USGS TopoView maps, a composite image of all watersheds where blue line analysis has been applied, as well as network validation images. Only watersheds located in the U.S. are included in this analysis.

Blueline networks were extracted from the TopoView maps with Safe Software's FME program.

对美国地质调查局（USGS）蓝色线路网络的分析，源自7.5'地形图，并探讨了这些持续和间歇性溪流网络长度范围与Lapides等人在其研究中出现的长度-持续时间曲线之间的对比（见图2）。与蓝色线路分析相关的资源包括平均河道长度的计算值、由USGS TopoView地图派生的shapefiles、应用蓝色线路分析的所有流域的合成图像，以及网络验证图像。本分析仅包括位于美国的流域。通过Safe Software的FME程序从TopoView地图中提取了蓝色线路网络。