Maunga Whau (Mt Eden) is one of about 50 volcanos in the Auckland volcanic field. This data set gives topographic information for Maunga Whau on a 10 m by 10 m grid. A matrix with 87 rows and 61 columns, rows corresponding to grid lines running east to west and columns to grid lines running south to north.
Volcano Maungawhau
Auckland New Zealand
36° 50' 50.586" S, 174° 45' 56.646" E
Available layers:
- volcano_maungawhau.asc --- the 10 m DEM digitized from the topo map;
Grid definition:
ncols: 61
nrows: 87
xllcorner: 2667400
yllcorner: 6478700
cellsize: 10 m
Lineage:
Digitized from a topographic map by Ross Ihaka. These data should not be regarded as accurate.
> data(volcano)
> library(spatstat)
> LLC <- data.frame(E=174.761345, N=-36.879784)
> coordinates(LLC) <- ~E+N
> proj4string(LLC) <- CRS("+proj=longlat +datum=WGS84")
> LLC.NZGD49 <- spTransform(LLC, CRS("+init=epsg:27200"))
> volcano.r <- as.im(list(x=seq(from=2667405, length.out=61, by=10),
+ y=seq(from=6478705, length.out=87, by=10),
+ z=t(volcano)[61:1,]))
> volcano.sp <- as(volcano.r, "SpatialGridDataFrame")
> proj4string(volcano.sp) <- CRS("+init=epsg:27200")
# str(volcano.sp)
# spplot(volcano.sp, at=seq(min(volcano.sp$v), max(volcano.sp$v),5),
+ col.regions=topo.colors(45))
> write.asciigrid(volcano.sp, "volcano_maungawhau.asc", na.value=-1)
Location:
Volcano Maungawhau
Auckland New Zealand
36° 50' 50.586" S, 174° 45' 56.646" E