How to use the digital photo point count system.

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# Point Count System for Measuring Ground Cover from Digital Photos. Edward B. Rayburn West Virginia University 1078 Ag. - PowerPoint PPT Presentation

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 [email protected] How to use the digital photo point count system. Take digital photos of the pasture or hay field.

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Point Count System for Measuring Ground Cover from Digital Photos.Edward B. RayburnWest Virginia University1078 Ag. ScienceMorgantown, WV [email protected]

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.