Positional Quality in VGI Apps Acquired by Smartphone's Location Sensors
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Abstract
The paper presents the positioning quality evaluation acquired by localization sensors coupled in smartphones, verifying its performance for Volunteered Geographic Information (VGI) field surveys. The experiments were carried as a case study, in which the coordinates collected in a VGI application (Hidromapp) were compared with their respective reference counterparts. The samples were collected under different conditions: using 05 smartphones with different characteristics and configurations. Based on the discrepancies, the positional accuracy was calculated for each of the samples, using the statistical indicator RMSE, including the analysis of different factors observed in the experiment. Then, the positioning quality was evaluated from the data use perspective (fitness-for-purpose), and was observed if the calculated positional accuracy is satisfactory to the Hidromapp application purposes. In results, it was identified that smartphones make possible spatial data collect with planimetric positional accuracy between 5m and 20m (safe range observed), depending on the survey conditions, and on the characteristics and configurations of the devices used. For the Hidromapp application, which aims to provide observed data support for hydrodynamic models and flood simulation, the performance of smartphones was considered satisfactory according to the researchers consulted.
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