georeference the photograph, then put it into ArcView. Find some objects in the photos that can be referenced. Measure the distance on the ground or on a photo of known scale. Then, measure the distance between the objects in the photo with unknown scale. The area per pixel can then be determined rather easily, and you can determine the area based on the number of pixels in the photo.
Malcolm McCallum On Mon, Jun 21, 2010 at 9:31 AM, Beth Strain <[email protected]> wrote: > Dear Ecology List Server > I have recently been given a set of photos which I would like to > convert into densities of species. The photos were taken haphardly but > do not contain a quadrat or transect. The photos cover a 1-2 m area. I > wanted to ask if anyone had any suggestions about how to calculate the > area of the photo. > Thanks for your help > Beth Strain. > -- Malcolm L. McCallum Managing Editor, Herpetological Conservation and Biology 1880's: "There's lots of good fish in the sea" W.S. Gilbert 1990's: Many fish stocks depleted due to overfishing, habitat loss, and pollution. 2000: Marine reserves, ecosystem restoration, and pollution reduction MAY help restore populations. 2022: Soylent Green is People! Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message.
