Note: Use Open source to create an GIS system

First need build own tile server first
OpenStreetMaps:
OpenStreetMap data is free to all, access to our volunteer-donated servers is not. A tile usage policy applies.  to below ref. for build tiles service server
ref.

Second. Build Presentation web server
To use Leaflet or OpenLayers for Build Own Maps Services

ref.

Others:

Geo Fencing feature with leaflet
https://github.com/psiborg/Geofence

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