1 / 8

How to use the digital photo point count system.

Point Count System for Measuring Ground Cover from Digital Photos. Edward B. Rayburn West Virginia University 1078 Ag. Science Morgantown, WV 26506 304-293-6131-4209 erayburn@wvu.edu. How to use the digital photo point count system. Take digital photos of the pasture or hay field.

augusta
Download Presentation

How to use the digital photo point count system.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Point Count System for Measuring Ground Cover from Digital Photos.Edward B. RayburnWest Virginia University1078 Ag. ScienceMorgantown, WV 26506304-293-6131-4209erayburn@wvu.edu

  2. How to use the digital photo point count system. • Take digital photos of the pasture or hay field. • Import photos into PowerPoint as a picture. • Copy the point count grid onto the slide. • Identify the species, botanical component or bare ground at the tip of each “V” and tabulate the numbers. • Relocate the grid and count again. • For 100 points the CI is ± 13% (0.05 probability) at 50% frequency. • For 250 points the CI is ± 8% (0.05 probability) at 50% frequency. • More photos using 100 points/photo is probably better than taking more than 100 points on a photo. • Clip some areas and hand separate the sample (quadrates in these photos) when calibrating percent ground cover against percent dry matter yield. • The effect of sample size on the confidence interval of a mean for a normal distribution (as in measurement of yield) and a binomial distribution (as in measurement of percent) are presented below.

More Related