#USGS QUAD MAP VIEWER HOW TO#

By 1890, there were four bridges which, according to Ray Bottenburg, helped the city to grow from 17,600 residents in 1880 to 90,000 in 1900. While river ferry service was available as early as 1853, the first bridge wasnвЂ™t built until 1887. Portland has 12 bridges which span the Willamette River.

The example here is based on creating bridge features for historic Portland, OR. The web map can also be used to create data by digitizing features on the historical maps into feature classes. You can open the web map in ArcGIS Desktop (Pro or ArcMap) to further explore the historical maps, overlay other feature classes on the historical maps, or use the historical maps as basemaps. Use the web map to create data in ArcGIS Desktop. For step-by-step instructions, see this ArcWatch tip: Bring Historical Topographic Maps Back to Life in Web Maps. The first step is to create the web map and view it in ArcGIS online. Create the web map from the USGS Historical Topographic Map Explorer app. Use the web map to digitize data in ArcGIS Desktop.

Create a web map from the USGS Historical Topographic Map Explorer app.

This workflow involves a two-step process:

#USGS QUAD MAP VIEWER HOW TO#

In this blog post, youвЂ™ll learn how to use the new functionality in the web app to create a web map saved to an ArcGIS Online account then use that web map in ArcGIS Pro to create new data by digitizing features on the historical maps. A previous ArcWatch tip guides users through the three steps for exploring the map collection in the web app, which organizes the maps by space, time, and map scale: The USGS Historical Topographic Map Explorer allows users to explore the historical maps and save the current view as a web map to view online or use in ArcGIS Desktop.ДЄ recent ArcWatch tip explains some of the most recent improvements to this app. Previously available only as printed lithographic copies, the legacy quadrangles are now available as web-viewable images and free, downloadable digital files. This web application (app) brings to life more than 178,000 maps dating from 1884 to 2006. In 2014, the US Geological Survey (USGS) and Esri collaborated to bring the ever-increasing collection of US historical topographic maps to everyone through the USGS Historical Topographic Map Explorer. By Aileen Buckley, PhD, Esri Research Cartographer

Usgs quad map viewer