Chapter 19: Legal Issues and Law Enforcement
Vertical air photos record situations that exist at a specific time and are particularly useful in recording changes if a sequence of photos of the same area exists. Property boundaries are difficult to define if they fall along a naturally changing feature such as a river channel. Three examples illustrate the legal problems that can arise.
Rivers have traditionally been used as boundaries between various administrative units: municipalities, counties, provinces, states, and even countries. However, they are unsatisfactory administrative boundaries because they change position over time resulting in ownership disputes.
19.12: Land Dispute on the Banks of the Assiniboine River, Southwest of Portage la Prairie, 1959 Photograph
Figure 19.12 is an air photo that shows the situation in 1959, before the Portage Dam was built. Meander scrolls 9 are visible south of the river. Over the years the farmer brought land accreted in this area into cultivation. However, in connection with the building of the Portage Floodway, the Province of Manitoba expropriated part of his land because it was expected that it would be flooded by backwater behind the dam.
Figure 19.12: Land Dispute on the Banks of the Assiniboine River, Southwest of Portage la Prairie, 1959 Photograph
Vertical air photograph: A16548-37
Flight height: 8,800 feet a.s.l.; lens focal length: 152.34 mm
Scale: 1:15,840 (approx.)
Date: June 15, 1959
Location: Township 11, Range 7WI
Map sheets: 1:250,000 62G Brandon
1:50,000 62G/16 Portage La Prairie