GIPSy: Geomagnetic indoor positioning system for smartphones

Providing Databases for Different Indoor Positioning Technologies: Pros and Cons of Magnetic Field and Wi-Fi Based Positioning

“…There are many papers in the literature dealing with magnetic field based methods for indoor localization problems. Some of them are reviewed in this section [19][20][21][22][23][24][25]. We focus on the dataset used for testing the proposed algorithms and we also state whether they are publicly available.…”

“…GIPSy, a positioning system that provided a median error of 2.1 m, was introduced in [25]. The main feature of this system is that the magnetic values are transformed to make them orientation independent using the gravity force values.…”

“…Although a single path of about 170 m was mapped several times under different conditions, details about data were not provided. Table 1 summarizes the databases used in the previous reviewed works [19,[21][22][23][24][25]. We have identified three different types of databases (groups 1, 2, and 3 in the table) according to how samples were taken: (1) continuous samples taken in a lineal environment (such as a corridor), (2) discrete samples taken in a lineal environment, and (3) discrete samples taken in a two-dimensional space.…”

“…For instance, the information about how locations are stored is not always provided. This information is described in some works (such as [21]), but it is omitted in the majority of contributions (such as in [19,[22][23][24][25]). To denote that this information was not provided, we used loc in Table 1.…”

“…In our case we consider not only corridors but also combinations of two connected corridors (turns changing corridor). In some works, information about the gathered data is not described [25].…”