Abstract
Abstract. One purpose of road lighting in night-time environment is to allow pedestrians safe passage and provide sense of security. To attain this purpose, guidelines are set to make sure that proper lighting are present in roads. Current mapping of road lighting in the Philippines is a tedious process. To address this issue, an alternative method of mapping illuminance using Unmanned Aerial System is developed. A 3D model of the road was created using overlapping images and is the basis of the data points. The results of the calibration show that each of the camera channels, as well the photopic luminance value denoted as ND, shows a linear trend with the illuminance value recorded within the subject area having a range of 0.17 to 15 lux. Linear regression models using each of the channels of the camera and ND can be used to calculate illuminance with RMSE of less than 0.6 lux. It also shows that all values calculated from all regression models exhibits similar trend with blue differing by being generally lower in value. With blue as the best linear regression model, 3D and 2D models of illuminance were created. With these results, it can be concluded that application of photogrammetry through UAV-mounted camera can be used to map illuminance at low level lighting.
Highlights
Road lighting has three main purposes: to allow all road users to proceed safely, to allow pedestrians safe passage and sense of security, and “to improve day-time and night-time appearance of the environment”
This study proposes a new method using Aerial Photogrammetry techniques to create an illuminance map and 3D data model for the evaluation of night-time road environment lighting condition by integrating image-derived illuminance value of the road to assess the limitations and possible enhancements
In creating the calibration curve for the channels of camera and illuminance value, both the drone and the lux meter were placed on a light box
Summary
Road lighting has three main purposes: to allow all road users to proceed safely, to allow pedestrians safe passage and sense of security, and “to improve day-time and night-time appearance of the environment”. In the Philippines, roadway lighting guidelines are created by the Department of Energy. Their evaluation mapping of roadway illuminance involves measurement of illuminance using lux meter on certain intervals, which is mapped as contours in the spreadsheet (DOE, n.d.). This method is tedious for large scale mapping and presents lower accuracy when done with higher intervals. This calls for a more efficient method of mapping of roadway lighting such as the use of photogrammetry
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