Creates covariate dataframes

Description

Creates covariate dataframes for observations and dummy quadrature points

Usage

1
2
LTDataFrame(study.area, lines, lines.psp, int.formula, det.formula, 
                   covariates, Q.lt)

Arguments

study.area

owin object that defines study area

lines

data frame of lines with structure as shown in quadscheme.lt

lines.psp

psp class with added list elements width and label

int.formula

model formula for intensity process

det.formula

model formula for detection scale process

covariates

covariate dataframe (see DSpat for structure)

Q.lt

lt quadscheme of class quad

Details

Checks to make sure that all of the variables used in formula are either in covariates or in lines. Then it extracts the values of covariates for each observation and for dummy points. These are merged with the needed covariates from lines and then a single dataframe is returned with the observations followed by the dummy points. In addition, the covariate images in a list are returned to keep with the dspat object for use in integrate.intensity.

Value

cov.df

dataframe of covariates followed by rows for covariates for dummy quadrature points

covariate.im

list of covariate images

Author(s)

Devin Johnson; Jeff Laake

See Also

quadscheme.lt,create.covariate.images

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