I was given a set of points which I eventually will overlay with a polygon shapefile in R. The issue is that the person who provided me with the points did not give them to in long/lat coordinates but the points were already projected (I will not be able to ask them to give me the points in a better format for a while). I was given the following information about the projection of the coordinates:
Top: 583309.373443 m Bottom: -1996690.626557 m Left: 221989.400576 m Right: 3572989.400576 m Projected Coordinate System: World_Sinusoidal Projection: Sinusoidal False_Easting: 0.00000000 False_Northing: 0.00000000 Central_Meridian: -76.00000000 Linear Unit: Meter
Here is the head of the csv I was given:
[,1] [,2] 1 2413489 -1995191 2 2416489 -1995191 3 2419489 -1995191 4 2422489 -1995191 5 2425489 -1995191 6 2428489 -1995191
I need to assign the correct projection now to read these points in correctly. Here is the pro4string and SpatialPoints code I have so far:
sinu_prj <- "+proj=sinu +x_0 +y_0 +units=m +no_defs" brazil_fish_pts <- SpatialPoints(brazil_fish_grid2, proj4string=CRS(as.character(sinu_prj)), bbox = NULL)
I know that the proj4string code is not correct but I don't know how to fix it? Can anyone be of help?