Use of 35-mm color aerial photography to acquire mallard sex ratio data
Photogrammetric Engineering and Remote Sensing
By: Edgar L. Ferguson, Dennis G. Jorde, and John L. Sease
Links
- More information: Publisher Index Page
- Download citation as: RIS | Dublin Core
Abstract
A conventional 35-mm camera equipped with an f2.8 135-mm lens and ASA 64 color film was used to acquire sex ratio data on mallards (Anas platyrhynchos) wintering in the Platte River Valley of south-central Nebraska. Prelight focusing for a distance of 30.5 metres and setting of shutter speed at 1/2000 of a second eliminated focusing and reduced image motion problems and resulted in high-resolution, large-scale aerial photography of small targets. This technique has broad application to the problem of determining sex ratios of various species of waterfowl concentrated on wintering and staging areas. The aerial photographic method was cheaper than the ground ocular method when costs were compared on a per-100 bird basis.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Use of 35-mm color aerial photography to acquire mallard sex ratio data |
| Series title | Photogrammetric Engineering and Remote Sensing |
| Volume | 47 |
| Issue | 6 |
| Year Published | 1981 |
| Language | English |
| Publisher | American Society for Photogrammetry & Remote Sensing |
| Contributing office(s) | Northern Prairie Wildlife Research Center |
| Description | 4 p. |
| First page | 823 |
| Last page | 827 |
| Country | United States |
| State | Nebraska |
| Other Geospatial | Platte River Valley |
| Google Analytic Metrics | Metrics page |