Mapping Cameras with OpenStreetMap's Web UI
From Mass Pirate Wiki
This is a quick tutorial on how to map surveillance cameras with Open Street Map's web interface.
First, you'll need to find some surveillance cameras. I usually sketch them out in a small notebook. This is a sketch of two dome cameras on a telephone pole, at the corner of Division St. and Williams St. in Chelsea MA. Crude sketches are fine, as long as you can understand them later.
Back at your computer, log into OpenStreetMap and find the location where the camera reside. Here it is for this example.
Next, click Edit (in the upper left corner of OpenStreetMap's web interface.
You'll see the editing UI, which looks like this: