  Detection of indoor and outdoor scenarios is an important resource for many
types of activities such as multisensor navigation and location-based services.
This research presents the use of NMEA data provided by GPS receivers to
characterize different types of scenarios automatically. A set of static tests
was performed to evaluate metrics such as number of satellites, positioning
solution geometry and carrier-to-receiver noise-density ratio values to detect
possible patterns to determine indoor and outdoor scenarios. Subsequently,
validation tests are applied to verify that parameters obtained are adequate.
