Created
October 2, 2014 18:58
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Merge a SpatialPolygonsDataFrame with a data.frame
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| merge.SpatialPolygonsDataFrame <- function (x, y, by, ...) { | |
| require(sp) | |
| y <- as.data.frame(y) | |
| if (missing(by)) { | |
| if (is.null(row.names(x@data)) || is.null(row.names(y))) { | |
| warning("[merge.SpatialPolygonsDataFrame] merging by position") | |
| i <- 1:nrow(x@data) | |
| } else { | |
| warning("[merge.SpatialPolygonsDataFrame] merging by row names") | |
| i <- row.names(x@data) | |
| } | |
| } else { | |
| message("[merge.SpatialPolygonsDataFrame] merging by ", by) | |
| i <- match(x@data[,by], y[,by]) | |
| } | |
| new_data <- data.frame(x@data, y[i,]) | |
| row.names(new_data) <- row.names(x@data) | |
| SpatialPolygonsDataFrame(geometry(x), new_data) | |
| } |
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