Under ideal conditions, observers can directly measure perpendicular distance using a tape measure or more advanced equipment, such as, a laser range finder. Detailed, in-depth descriptions of distance sampling methods can be found in Buckland et al. Detection functions are a pivotal component in calculating reliable estimates of population abundance and/or densities. Perpendicular distances are used to model detection functions that estimate the proportion of objects present but undetected during the survey process. For each object of interest detected, observers record the perpendicular distance from the object of interest or center of group to the transect leg. Objects of interest can be either a single animal or plant, or groups of animals or plants. (2002), involves an observer or team of observers traversing a linear search path (i.e., transect or transect leg) looking for objects of interest. The general concept behind line transect surveys, as summarized in Thomas et al. Of these methods, line transect distance sampling is the most broadly applied technique. Line transect distance sampling is a suite of related methods commonly used for estimating the density and/or abundance of biological populations (Buckland et al. **Department of Physics and Center for Soft Matter Research, New York University, 4 Washington Place, New York, New York, 10003 USA *American Museum of Natural History, Center for Biodiversity and Conservation, 200 Central Park West, New York, New York, 10024 USA American Museum of Natural History, Center for Biodiversity and Conservation. Perpendicular Distance Calculator(version 1.2.2). If you use the application on data that results in a publication, report, or online analysis, we ask that you include the following reference: Ersts,P.J. Polin Perpendicular Distance Calculator(version 1.2.2) Documentation. If you wish to cite the background or documentation we suggest the following format: Ersts,P.J., Horning, N., and M. Platform independent jar | PerpendicularDistanceCalculator_v1.2.2.zip (32.7 KB) Visit our main page to learn more about the Center for Biodiversity and Conservation. Line transect sampling a commonly used distance sampling method that can be used for estimating the density and/or abundance of biological populations. ![]() The Perpendicular Distance Calculator is a platform-independent Java application that implements a powerful suite of spherical functions for processing observations made during standard line transect surveys.
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