**3.3. System operation environment**

The system operates using the Web server, database server, and the GIS server. **Figure 2**  shows the operating environment of the system. The Web server and database server both use the Heroku, which is a Platform as a Service (PaaS) provided by the Salesforce company. For the GIS server, the ArcGIS Online was used. The Web application developed with the system was implemented using PHP and JavaScript.
