A small scale map of your community shows the relationship of streets by using a single line that represents where the approximate center of the road is located. That’s great when the map is “zoomed out” to show the entire municipality. When someone “zooms in” on the map to a neighborhood, you should show them more detail such as the width of the paved roadway.
In our last blog post, we demonstrated how you can download lots of useful information from PASDA to build a simple base map as the starting point for a municipal GIS. In this post we’re going one step further to give our map an “edge of pavement” layer that shows the location of the road surface.
Some benefits of an edge of pavement (EOP) layer include allowing people to easily recognize the difference between narrow alleyways and major city streets. It facilitates take-offs for repaving or construction work. It also eases analysis of turning movements for emergency apparatus.
Since an EOP is made up of polygon features which can be used to calculate area in square feet or acres, it is also the starting point for mapping impervious surfaces in your municipality for stormwater management purposes.
The broad steps in this process are:
- Find and download the LIDAR breaklines tiles for your location
- Filter the breaklines tiles to show only roadways
- Combine all of the breakline tiles into a single continuous layer
- Edit the breaklines to prepare them for polygon conversion
- Convert the breaklines to polygons
- Edit the polygon feature to remove areas that are not paved.
To get detailed instructions on how to complete the process using ESRI ArcGIS for Desktop Advanced, fill out the form below.