I want to plot spatial points (sp) on a landsat compository, plotting landsat works and plotting the sp as well, but it does not work together. I am quite sure that I somehow don't get the overwriting of the projection/coordinate system, but don't know what I am doing wrong. Googleing didn't help, so I ask you.
Here is the code:
coords_glaciers <- data.frame(x = prec_year$latitude, y = prec_year$longitude)
head(coords_glaciers)
x y
1 30.69800 95.10474
2 30.69628 95.09544
3 30.69173 95.04394
4 30.68793 95.08615
5 30.68799 95.20155
6 30.68472 95.21425
pts_glaciers <- SpatialPoints(coords = coords_glaciers)
pts_glaciers
class : SpatialPoints
features : 865
extent : 29.50121, 30.82512, 94.24684, 96.19304 (xmin, xmax, ymin, ymax)
coord. ref. : NA
proj <- projection(landsat)
proj
[1] "+proj=utm +zone=46 +ellps=WGS84 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs"
pts_glaciers <- SpatialPoints(coords = coords_glaciers, proj4string = CRS(proj))
pts_glaciers
class : SpatialPoints
features : 865
extent : 29.50121, 30.82512, 94.24684, 96.19304 (xmin, xmax, ymin, ymax)
coord. ref. : +proj=utm +zone=46 +ellps=WGS84 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs
plotRGB(landsat, r=5, g=4,b=3)
plot(pts_glaciers, add =TRUE)
I think the solution is:
coords_glaciers <- data.frame(x = prec_year$longitude, y = prec_year$latitude)
coordinates(coords_glaciers) <- c("x","y")
proj4string(coords_glaciers) <- CRS("+proj=longlat +datum=WGS84")
pts_glaciers <- spTransform(coords_glaciers, CRS("+proj=utm +zone=46 +ellps=WGS84 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs"))