cruz {unmarked} | R Documentation

## Landscape data for Santa Cruz Island

### Description

Spatially-referenced elevation, forest cover, and vegetation data for Santa Cruz Island.

### Usage

    data(cruz)

### Format

A data frame with 2787 observations on the following 5 variables.

`x`

  Easting (meters)

`y`

  Northing (meters)

`elevation`

  a numeric vector, FEET (multiply by 0.3048 to convert to meters)

`forest`

  a numeric vector, proportion cover

`chaparral`

  a numeric vector, proportion cover

### Details

The resolution is 300x300 meters.

The Coordinate system is EPSG number 26911

NAD_1983_UTM_Zone_11N Projection: Transverse_Mercator False_Easting: 500000.000000 False_Northing: 0.000000 Central_Meridian: -117.000000 Scale_Factor: 0.999600 Latitude_Of_Origin: 0.000000 Linear Unit: Meter GCS_North_American_1983 Datum: D_North_American_1983

### Source

Brian Cohen of the Nature Conservancy helped prepare the data

### References

Sillett, S. and Chandler, R.B. and Royle, J.A. and Kery, M. and Morrison, S.A. In Press. Hierarchical distance sampling models to estimate population size and habitat-specific abundance of an island endemic. Ecological Applications

### Examples

    data(cruz)
    str(cruz)

    levelplot(elevation ~ x + y, cruz, aspect="iso",
        col.regions=terrain.colors(100))

    if(require(raster)) {
    elev <- rasterFromXYZ(cruz[,1:3],
         crs="+proj=utm +zone=11 +ellps=GRS80 +datum=NAD83 +units=m +no_defs")
    elev
    plot(elev)
    }

[Package unmarked version 0.12-3 Index]