The Origins of Imperfection in Geographic Data

Combining error models to reduce the imprecision of geometric length measurement in vector databases

“…Main components of length errors in the process of BDCARTO roads digitizing, adapted from Follin et al. (2019). …”

“…To model the different causes of geometric measurements error, we propose to use a process-based approach. In this approach, already presented in Follin et al (2019), each process can be characterized by several components, which are: an input, an output, as well as resources that integrate the material and human resources mobilized to carry out the activity.…”

“…For each cause, the length error is defined as the difference between the initial geometric length and the length estimated by the model. F I G U R E 1 Main components of a process for creating geographic data with associated causes or measurement errors (adapted from Follin et al, 2019).…”

“…Main components of a process for creating geographic data with associated causes or measurement errors (adapted from Follin et al., 2019). …”