count.points | R Documentation |

`count.points`

counts the number of points in
each pixel of a raster map inheriting the class
`SpatialPixels`

.

```
count.points(xy, w)
```

`xy` |
an object of class |

`w` |
an object inheriting the class |

an object of class `SpatialPixelsDataFrame`

containing the number
of points in each cell of the raster map. If `xy`

is a
`SpatialPointsDataFrame`

with one column (a factor), the
resulting object contains one column per level of this factor.

Clement Calenge clement.calenge@ofb.gouv.fr

`SpatialPixelsDataFrame-class`

for additionnal
information on objects of class `SpatialPixelsDataFrame`

.

```
data(lynxjura)
# locs is the SpatialPointsDataFrame containing the
# locations of presence indices of Lynx in the Jura mountains (France)
locs <- lynxjura$locs
head(locs)
# sa is the SpatialPixelsDataFrame object containing
# maps of the study area
sa <- lynxjura$map
# Count all points
cp <- count.points(locs, sa)
cp
image(cp)
# count the points per type of lynx presence indices:
cp <- count.points(locs[,2], sa)
cp
```

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