An image reconstruction algorithm system for hazardous source mapping. The algorithm system can be used to automate and optimize the search path of a movable vehicle (such as a UAV), equipped with detection capability. The algorithm allows the vehicle to localize hazardous sources in multiple scenarios effectively. Hazard mapping is formulated as an inverse problem and solved either with a deconvolution or a reconstruction algorithm, according to the problem complexity. The algorithms can use the Maximum a Posteriori (MAP) and the least square regression algorithm, respectively. However, alternative algorithms can be used as set forth herein. The source mapping algorithms are able to provide a quantitative estimation of the hazard source magnitude. A non-negative version of the least square algorithm is used to reconstruct the map at each step of the navigation algorithm of the vehicle. The navigation algorithm correctly located single and multiples simulated hazardous sources.

A method includes obtaining piece(s) of calendar information indicative of at least one appointment taking place in a space and extracting a set of space identifiers representing space(s) of the venue. The space identifier(s) for one or more spaces are extracted based on an indoor map of the venue. The method also includes determining or triggering determining whether at least a part of the set of space identifiers or one or more spaces of the set of space identifiers match(es) the at least one space as represented by the piece(s) of calendar information; and if a match is found: determining one or more reference location estimates. A respective reference location estimate is indicative of a location of the space that was determined to be a match. A corresponding apparatus, computer program product and system are also provided.

A method, apparatus and computer readable storage medium are provided for determining absolute altitudes of individual floors represented by an indoor map. In the context of a method, location data is obtained representing at least one track of one or more users at least partially in a structure. The location data includes horizontal and vertical location information with the vertical location information representing an absolute altitude. The method also includes obtaining indoor map data representing different floors and indicating structural elements on the floors and determining track sections of the at least one track represented by the location data such that each track section can be assumed to be on a single floor. The method further includes at least partially comparing determined track sections with floors represented by the indoor map data and determining an absolute altitude of at least some of the floors represented by the indoor map data.

In a positioning system, a plurality of transmitter units (2, 3, 4, 5) transmit respective locating signals which are received at a mobile receiver unit (7). A processing system (7; 9) identifies the transmitter unit that transmitted each locating signal, and determines, for each transmitter unit, range data representative of a respective distance between the transmitter unit and the mobile receiver unit. The processing system determines a position estimate for the mobile receiver unit (7) by solving an optimisation problem that depends on i) the range data determined for the plurality of transmitter units, ii) data representative of the positions of the plurality of transmitter units in an environment (1), and iii) data representative of a position of a surface (1a, 1b, 1c, 1d, 1e; 601, 602) in the environment, by optimising for an objective function comprising a cost term that depends on a distance between the surface and the position estimate.

Methods, apparatus, systems, and articles of manufacture are disclosed to locate persons based on adjustable signal strength thresholds. Example instructions cause processor circuitry to at least collect monitoring area information for a monitoring environment. Example instructions additionally cause the processor circuitry to determine, based on the monitoring area information, one or more one or more signal strength thresholds to set for one or more radio frequency (RF) beacons deployed to the monitoring environment. In some examples, example instructions cause the processor circuitry to, after reception of monitoring information from one or more devices in the monitoring environment, process the monitoring information and the one or more signal strength thresholds to determine one or more locations of the one or more devices in the monitoring environment.

According to one embodiment, an electronic apparatus includes a processor configured to estimate positions of wireless devices communicating each other from a plurality of position candidates based on position candidate information indicating the position candidates of the wireless devices and communication information between the plurality of wireless devices located in any of the plurality of position candidates, and determine a first position among the position candidates according to a likelihood of the wireless devices estimated to be located in the position candidates.

An event verification application for accurately assessing geolocation data for users of the application to establish, record, and report attendance at those events for compliance, personal, or other use.

An information processing apparatus includes: a processor configured to acquire position information of a communication device; and a storage configured to store first map information and second map information. The processor is further configured to, in a case in which the processor acquires position information a predetermined number of times of at least two or more, in a first partial area of plurality of first partial areas, determine that the communication device exists in the first partial area. The processor is further configured to, in a case in which the processor acquires position information a predetermined number of times of at least two or more, in a second partial area of plurality of second partial areas, determine that the communication device exists in the second partial area.

In aspects of object tracking based on UWB tags, a system includes ultra-wideband (UWB) tags located for association with respective objects in an environment, where each UWB tag is identified with a digital label indicative of the association with one or more of the objects. A tracking service is implemented to receive initial location data for the objects from each of the UWB tags that are associated with the objects, and generate an object identity database in which each of the objects are identified by their respective initial location data. The tracking service can monitor for movement of an object that is identified by the initial location data based on subsequent positioning data associated with the object. The movement of an object is monitored for an unauthorized relocation of the object, for a cluster of multiple objects moving together, and/or for an abnormal proximity of multiple objects in the environment.

A method and a location service component for providing an estimate of a location related to a device are disclosed. The location service component receives a request from a client for the estimate of the location and estimates the location based on a predictive model to obtain an initial set of data items. Each data item includes a respective estimate of the location and a set of identities representing one or more further devices in a neighborhood of the device. The location service component obtains a respective location for each of the further devices based on the set of identities. The location service component removes data items that are inconsistent with the respective location for the further devices to obtain a pruned set of data items. The location service component sends, estimates of the pruned set of data items to the client. A corresponding computer program and a computer program carrier are also disclosed.