Streetlighting Data Tools

Figure out when streetlights are on and whether they were providing visibility during events

Nautical Twilight Schedule

Generate a yearly streetlight operating schedule for any location. Returns daily nautical dusk (lights ON) and nautical dawn (lights OFF) times.

The placeholder coordinates (36.7456, −93.4712) are the US Census population-weighted centroid for the United States, near Hartville, MO — useful for understanding average streetlight operating times across the country. For regional analysis (e.g., crashes in Kansas or the Denver metro area), use a state or metropolitan area population-weighted centroid from the same Census reference. Streetlights turn ON at −6° sun elevation (end of civil twilight) and OFF at −6° (start of civil twilight).

Phase Calculator

Upload a CSV with coordinates and timestamps. Each record gets tagged with sun elevation, twilight phase, and streetlight status.

1. Upload CSV

Drop a .csv file here or

Maximum 2.5 million rows

2. Map Columns

Confirm which columns contain your location and date/time fields.

3. Processing

4. Download Results

Download CSV

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GIS Service Discovery

Search across multiple public GIS servers by keyword. This crawls each server's ArcGIS REST catalog directly and live, in real time.

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