Title
Preparing a Sample Design for Point Transects with DISTANCE 7.3 and GIS Software
Author(s)
Maisels, F.; Strindberg, S.; Brncic, T.
Published
2019
Abstract
This document, which is available in both English and French versions, outlines the steps to take when designing a survey for point transects that use camera traps. The number of points and the length of time that they are deployed will depend on the effort required for a target coefficient of variation (CV), and on the number of cameras available. It is advised that at least 50 points are set per survey stratum. For example, if 1,000 trap-days are required for estimation of density of a given species, that can be 1,000 camera traps for one 24-hour period, or 100 camera traps for ten 24-hour periods, or 50 camera traps for twenty 24-hour periods. In this document, we assume that we have 50 camera traps, and an area within which we will set the traps. We describe how to design the survey so that the 50 cameras are placed systematically, with a random start, using a combination of GIS and the Distance software. The results are a shapefile of the locations of the points, and a set of x and y coordinates (in excel format) that can be uploaded to a GPS and /or SMART.
Keywords
distance sampling; point transects; camera trapping; methodology; density; wildlife abundance; terrestrial species

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