Abstract: Various embodiments of the present application set forth a computer-implemented method comprising aggregating positional signals that were received from device sensors, where each positional signal has an observed signal strength, identifying a subset of the positional signals, where each positional signal in the subset was received by a device sensor while the device sensor was located within the physical location, for each positional signal, generating, by an estimation device and based at least on a position of the device sensor, an approximate object height for an object located at the physical location, for each approximate object height, determining an expected signal strength for the positional signal corresponding to the approximate object height, generating a cost value that is based on a difference between the expected signal strength and the observed signal strength, and determining, by the estimation device and based on the cost values, an estimated object height.

Abstract: A system for identifying characteristics of objects on which they are positioned and tracking the identified objects when sold. The system includes a master tracking sheet and a plurality of identification sheets. Each of the identification sheets includes a plurality of removable self adhesive labels positioned therein. Each label has indicia identifying a particular characteristic of a respective one of the objects printed thereon and a code separating the labels into groups. Each group identifies an owner of the objects on which the labels of that group are adhered. The master tracking sheet includes a plurality of columns, each column being associated with a respective group of labels. The indicia relates to at least one of price, condition, inventory codes and conditions for sale of the object on which the labels are adhered. When an object is sold, the monetary value on a label adhered thereto is inserted in the correct column on the tracking sheet.