Integration of android application and GNSS module for geographic information system (GIS) of assets in near real-time

PDAM Surya Sembada, a clean water provider in Surabaya, faces challenges in managing databases and water assets. Geographic Information Systems (GIS) and low-cost Global Navigation Satellite Systems (GNSS) offer solutions to enhance asset monitoring. However, integrating low-cost GNSS with PDAM databases on Android applications is still not optimal, as it functions only as a receiver, not as base station. This study develops low-cost GNSS tool and Android application to integrate SMART GEO-PD ITS with PDAM databases using NTRIP (Network Transport of RTCM via IP) to distribute corrections, Bluetooth for Android integration, and API (Application Programming Interface) for PDAM database access. SMART GEO-PD ITS is a low-cost GNSS receiver developed through collaboration between ITS and PDAM Surya Sembada, designed for high-precision positioning and easy smartphone integration. Testing is conducted to assess the accuracy, consistency, and level of correction of low-cost GNSS. The corrections provided by low-cost GNSS are compared with those from InaCORS, an Indonesian Continuously Operating Reference Station (CORS) managed by the Badan Informasi Geospasial (BIG), Indonesia's geospatial information agency. Accuracy and consistency of PDAM asset geolocation measurement compared to geodetic GNSS. Results indicate that the low-cost GNSS base station can broadcast correction signals via NTRIP and is publicly accessible. The integration of the Android application and SMART GEO-PD ITS enables near real-time PDAM asset geolocation and management. Tests show that the InaCORS correction is not equivalent to low-cost GNSS correction. Accuracy and consistency testing has shown that geodetic GNSS does not offer the same level of accuracy and consistency as low-cost GNSS. In geolocation tests, the difference distance ranged from 0.017 to 0.29 m, whereas with low-cost GNSS it ranged from 0.005 to 0.111 m. Users have rated this application highly for recording PDAM customer water asset data.