quadscheme.lt: Create line transect quadrature for spatstat

Description Usage Arguments Value Author(s) See Also

View source: R/quadscheme.lt.R

Description

Creates a quadrature for spatstat from a study area, observations, and lines

Usage

1
2
quadscheme.lt(study.area, observations, lines, width = NULL,
                      epsvu = c(1, 0.01), show.warnings=FALSE)

Arguments

study.area

owin class giving the boundaries of the study area

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 from center line
             ...     - any number of covariates
           
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 transect around line
            angle - angle of rotation to get to vertical
            ...   - any number of covariates
           
width

if no width field is given in lines then it must be specified here as a constant width for all lines

epsvu

pixel dimensions epsvu[1] in v direction (height) and epsvu[2] in u direction (width) (these are used once line is rotated vertically.

show.warnings

if TRUE, warnings from quadrature construction will be shown.

Value

Q

quadscheme as defined in spatstat

transects

list of transect polygon dataframes

lines.psp

line segment process

Author(s)

Devin Johnson; Jeff Laake

See Also

LTDataFrame


DSpat documentation built on May 30, 2017, 2:35 a.m.