Point Transect Sampling Along Linear Features
Article first published online: 22 JAN 2010
© 2010, The International Biometric Society Peterson Institute for International Economics
Volume 66, Issue 4, pages 1247–1255, December 2010
How to Cite
Marques, T. A., Buckland, S. T., Borchers, D. L., Tosh, D. and McDonald, R. A. (2010), Point Transect Sampling Along Linear Features. Biometrics, 66: 1247–1255. doi: 10.1111/j.1541-0420.2009.01381.x
- Issue published online: 22 JAN 2010
- Article first published online: 22 JAN 2010
- Received January 2009. Revised November 2009. Accepted November 2009.
- Distance sampling;
- Hare survey;
- Linear features;
- Nonrandom samplers;
- Nonuniform density;
- Point transects;
Summary Distance sampling is a widely used methodology for assessing animal abundance. A key requirement of distance sampling is that samplers (lines or points) are placed according to a randomized design, which ensures that samplers are positioned independently of animals. Often samplers are placed along linear features such as roads, so that bias is expected if animals are not uniformly distributed with respect to distance from the linear feature. We present an approach for analyzing distance data from a survey when the samplers are points placed along a linear feature. Based on results from a simulation study and from a survey of Irish hares in Northern Ireland conducted from roads, we conclude that large bias may result if the position of samplers is not randomized, and analysis methods fail to account for nonuniformity.