An aerial imaging system comprising: a first camera system carried by a first aircraft, wherein the first camera system generates first images during a flight of the first aircraft; a barometric altitude sensor system (234, 314) carried by the first aircraft, wherein the barometric altitude sensor system (234, 314) measures a first altitude for the first aircraft using a barometric altitude sensor; and a computer system, wherein the computer system is configured to: determine a first distance from the first aircraft to a key point using the first images of the key point generated by the first camera system associated with the first aircraft during the flight of the first aircraft and stereo depth triangulation; receive, from a second aircraft, a second distance to the key point from the second aircraft and a second altitude measured for the second aircraft using a barometric altitude sensor associated with the second aircraft; compare the first distance to the key point from the first aircraft and the first altitude with the second distance to the key point from the second aircraft and the second altitude by forming ratios of the measured altitudes to the respective determined distances; and determine an offset between the first altitude and the second altitude based on the formed ratios, wherein the offset is used to adjust the first altitude measured for the first aircraft such that the ratio for the first aircraft matches the ratio for the second aircraft. a first camera system carried by a first aircraft, wherein the first camera system generates first images during a flight of the first aircraft; a barometric altitude sensor system (234, 314) carried by the first aircraft, wherein the barometric altitude sensor system (234, 314) measures a first altitude for the first aircraft using a barometric altitude sensor; and a computer system, wherein the computer system is configured to: determine a first distance from the first aircraft to a key point using the first images of the key point generated by the first camera system associated with the first aircraft during the flight of the first aircraft and stereo depth triangulation; receive, from a second aircraft, a second distance to the key point from the second aircraft and a second altitude measured for the second aircraft using a barometric altitude sensor associated with the second aircraft; compare the first distance to the key point from the first aircraft and the first altitude with the second distance to the key point from the second aircraft and the second altitude by forming ratios of the measured altitudes to the respective determined distances; and determine an offset between the first altitude and the second altitude based on the formed ratios, wherein the offset is used to adjust the first altitude measured for the first aircraft such that the ratio for the first aircraft matches the ratio for the second aircraft. determine a first distance from the first aircraft to a key point using the first images of the key point generated by the first camera system associated with the first aircraft during the flight of the first aircraft and stereo depth triangulation; receive, from a second aircraft, a second distance to the key point from the second aircraft and a second altitude measured for the second aircraft using a barometric altitude sensor associated with the second aircraft; compare the first distance to the key point from the first aircraft and the first altitude with the second distance to the key point from the second aircraft and the second altitude by forming ratios of the measured altitudes to the respective determined distances; and determine an offset between the first altitude and the second altitude based on the formed ratios, wherein the offset is used to adjust the first altitude measured for the first aircraft such that the ratio for the first aircraft matches the ratio for the second aircraft.