Physical 3D models from LIDAR data as tactile maps for visually impaired persons

Abstract

The paper describes the creation of a physical 3D model representing the Solvalla recreation area in South Finland. The data processing part includes the extraction of elevation models and other topographic features from LIDAR data and aerial photographs as well as steps to stack up the separate layers to the digital model suitable for the 3D printing. The present prototype is directed at the special needs of visually impaired persons. This influences the design of topographic objects such as roads and paths, the representation of certain areas such as water bodies and the choice of the colours in the model. The printed 3D model is used in a small user test with visually impaired persons.