OpenStreetMap
OpenStreetMap (OSM) is an open source website that provides open map data from user contributions (not official sources). While this allows for data to be updated more quickly, the type of data available for each location varies. Therefore, you must first check if the data you need is available on OSM's website. If OSM does not have the data you need, please talk to a staff member.
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Now that you have ensured that the data is available, you can extract the data using one of two methods. Read the descriptions below to decide which of the two methods is appropriate for your project.
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Geofabrik Downloads
This method extracts OSM data in 3 shapefiles: lines, polygons, and points. This is useful if you need all of OSM's data or are unsure of which data you need.into shapefiles that each represent roads, building footprints, waterways, etc.
Geofabrik Downloads offers regularly-updated extracts of continents, countries, and selected cities.
- Open the website in a browser.
- Click on the Export tab on the top of OpenStreetMap web page.
- From the menu, go to Geofabrik Downloads.
- From the table, click on the Sub-Region your area of interested is located in. Some countries and regions are subdivided into smaller datasets.
- Find and click on the link with .shp.zip file extension, which yields ESRI compatible shape files when unzipped.In ArcMap, zoom in to your area of interest using a basemap. OSM limits extraction to 50,000 nodes. The images below can be used as reference to estimate the number of nodes in different-sized regions on a basemap. If the area you need is bigger than the 50,000 node limit, you can extract multiple tiles and merge them.
Area of around 50,000 nodes.
Area of around 25,000 nodes.
Area of around 5,000 nodes.