LTDataFrame: Creates covariate dataframes
In DSpat: Spatial Modelling for Distance Sampling Data

Description Usage Arguments Details Value Author(s) See Also

Creates covariate dataframes for observations and dummy quadrature points

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

`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

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.