A system for determining a length of an object includes a rod, an imaging device couplable to the rod, a laser rangefinder, one or more sensors, and a processor. The processor can receive image data, the orientation of the rod relative to the surface, and the distance to the surface from the imaging device and can determine the length of the rod. A system for surveying trees within a plot includes an imaging device, one or more sensors for measuring at least one of a pitch, a roll, or a compass bearing of the imaging device, and one or more processors configured to receive images of the plot including trees within the plot, associate one or more sensor measurements with the images, store the images with their associated measurements, and generate a survey of trees in the plot using at least the images and the one or more sensor measurements.