create.points.by.offset: Create point dataframe offset from line
In DSpat: Spatial Modelling for Distance Sampling Data

Description Usage Arguments Value Author(s) See Also

For a set of observations with x,y locations on the line and a perpendicular distance, create a new observation dataframe with true x,y point locations.

1	create.points.by.offset(lines, observations)

lines

- data frame of lines with the following structure
             label - unique label
             x0    - x coordinate of beginning of line
             y0    - y coordinate of beginning of line
             x1    - x coordinate of end of line
             y1    - y coordinate of end of line
             width - optional full width of each transect
                      line is in center of transect
             ...   - any number of covariates

observations

- data frame of observations with the following structure
             label   - label linking it to a unique line
             x       - x coordinate
             y       - y coordinate
             distance- perpendicular distance;
                       positive=right side; negative=left side
               ...   - any number of covariates

observations dataframe with true x,y locations

Jeff Laake

offset.points

DSpat documentation built on May 2, 2019, 11:10 a.m.