Dataformat

Two data.frames must be provided to dsm. They are referred to as observation.data and segment.data (for observation and segment data, respectively).

observation.data

The observation data frame must have the following columns:

• object -- unique object identifier.
• Sample.Label -- the identifier for the segment where the observation occurred.
• size -- the size of each observed group (i.e. 1 for individuals).
• distance -- perpendicular/radial distance to observation.

segment.data

The segment data frame must have the following columns:

• Effort -- the effort (in terms of length of the segment). Note this is not necessary if the segment.area argument is given. See main dsm documentation.
• Sample.Label -- identifier for the segment (unique!).
• ??? -- environmental covariates, for example x and y for geographical coordinates.