google地图连不上，国内可以连baidu地图，也挺好用的，贴一段大神写的代码，可以当函数用：
getdumap<-function (center = c(lon = -95.3632715, lat = 29.7632836),
zoom = 10,
size = c(640, 640),
scale = 2,
format = c("png8", "gif", "jpg", "jpg-baseline", "png32"),
maptype = c("terrain","satellite", "roadmap", "hybrid"),
language = "en-EN", region, markers, path, visible, style,
sensor = FALSE, messaging = FALSE,
urlonly = FALSE, filename = "ggmapTemp",
color = c("color", "bw"), ...)
{
#读取字符串
args <- as.list(match.call(expand.dots = TRUE)[-1])
argsgiven <- names(args)
#中心判别
if ("center" %in% argsgiven) {
if (!((is.numeric(center) && length(center) == 2) ||
(is.character(center) && length(center) == 1))) {
stop("center of map misspecified, see ?get_googlemap.",
call. = F)
}
if (all(is.numeric(center))) {
lon <- center[1]
lat <- center[2]
if (lon < -180 || lon > 180) {
stop("longitude of center must be between -180 and 180 degrees.",
" note ggmap uses lon/lat, not lat/lon.", call. = F)
}
if (lat < -90 || lat > 90) {
stop("latitude of center must be between -90 and 90 degrees.",
" note ggmap uses lon/lat, not lat/lon.", call. = F)
}
}
}
#放大倍数判别
if ("zoom" %in% argsgiven) {
if (!(is.numeric(zoom) && zoom == round(zoom) && zoom >
0)) {
stop("zoom must be a whole number between 1 and 21",
call. = F)
}
}
#图片尺寸
if ("size" %in% argsgiven) {
stopifnot(all(is.numeric(size)) && all(size == round(size)) &&
all(size > 0))
}
#图片精细度
if ("scale" %in% argsgiven) {
stopifnot(scale %in% c(1, 2, 4))
}
#标注
if ("markers" %in% argsgiven) {
markers_stop <- TRUE
if (is.data.frame(markers) && all(apply(markers[, 1:2],
2, is.numeric)))
markers_stop <- FALSE
if (class(markers) == "list" && all(sapply(markers, function(elem) {
is.data.frame(elem) && all(apply(elem[, 1:2], 2,
is.numeric))
})))
markers_stop <- FALSE
if (is.character(markers) && length(markers) == 1)
markers_stop <- FALSE
if (markers_stop)
stop("improper marker specification, see ?get_googlemap.",
call. = F)
}
#折现标注
if ("path" %in% argsgiven) {
path_stop <- TRUE
if (is.data.frame(path) && all(apply(path[, 1:2], 2,
is.numeric)))
path_stop <- FALSE
if (class(path) == "list" && all(sapply(path, function(elem) {
is.data.frame(elem) && all(apply(elem[, 1:2], 2,
is.numeric))
})))
path_stop <- FALSE
if (is.character(path) && length(path) == 1)
path_stop <- FALSE
if (path_stop)
stop("improper path specification, see ?get_googlemap.",
call. = F)
}
#出现此标识推出
if ("visible" %in% argsgiven) {
message("visible argument untested.")
visible_stop <- TRUE
if (is.data.frame(visible) && all(apply(visible[, 1:2],
2, is.numeric)))
visible_stop <- FALSE
if (is.character(visible))
visible_stop <- FALSE
if (visible_stop)
stop("improper visible specification, see ?get_googlemap.",
call. = F)
}
#地图类型
if ("style" %in% argsgiven) {
message("style argument untested.")
style_stop <- TRUE
if (is.character(style) && length(style) == 1)
style_stop <- FALSE
if (style_stop)
stop("improper style specification, see ?get_googlemap.",
call. = F)
}
if ("sensor" %in% argsgiven)
stopifnot(is.logical(sensor))
if ("messaging" %in% argsgiven)
stopifnot(is.logical(messaging))
if ("urlonly" %in% argsgiven)
stopifnot(is.logical(urlonly))
if ("filename" %in% argsgiven) {
filename_stop <- TRUE
if (is.character(filename) && length(filename) == 1)
filename_stop <- FALSE
if (filename_stop)
stop("improper filename specification, see ?get_googlemap.",
call. = F)
}
if ("checkargs" %in% argsgiven) {
.Deprecated(msg = "checkargs argument deprecated, args are always checked after v2.1.")
}
format <- match.arg(format)
if (format != "png8")
stop("currently only the png format is supported.", call. = F)
maptype <- match.arg(maptype)
color <- match.arg(color)
if (!missing(markers) && class(markers) == "list")
markers <- plyr:::list_to_dataframe(markers)
if (!missing(path) && is.data.frame(path))
path <- list(path)
#修改1：开始连接变量
base_url <- "http://api.map.baidu.com/staticimage?"
center_url <- if (all(is.numeric(center))) {
center <- round(center, digits = 6)
lon <- center[1]
lat <- center[2]
#修改4
paste("center=", paste(lon , lat, sep = ","), sep = "")
}
else {
centerPlus <- gsub(" ", "+", center)
paste("center=", centerPlus, sep = "")
}
zoom_url <- paste("zoom=", zoom, sep = "")
#修改2
size_url <- paste(paste("height=",size[2],sep=""),paste("width=",size[1],sep=""),sep="&")
scale_url <- if (!missing(scale)) {
paste("scale=", scale)
}
else {
""
}
format_url <- if (!missing(format) && format != "png8") {
paste("format=", format)
}
else {
""
}
maptype_url <- paste("maptype=", maptype, sep = "")
language_url <- if (!missing(language)) {
paste("language=", language)
}
else {
""
}
region_url <- if (!missing(region)) {
paste("region=", region)
}
else {
""
}
markers_url <- if (!missing(markers)) {
if (is.data.frame(markers)) {
paste("markers=", paste(apply(markers, 1, function(v) paste(rev(round(v,6)), collapse = ",")), collapse = "|"), sep = "")
}
else {
paste("markers=", markers, sep = "")
}
}
else {
""
}
path_url <- if (!missing(path)) {
if (is.list(path)) {
ps <- sapply(path, function(one_path) {
paste("path=", paste(apply(one_path, 1, function(v) paste(rev(round(v,6)), collapse = ",")), collapse = "|"), sep = "")
})
paste(ps, collapse = "&")
}
else {
paste("path=", path, sep = "")
}
}
else {
""
}
visible_url <- if (!missing(visible)) {
if (is.data.frame(visible)) {
paste("visible=", paste(apply(visible, 1, function(v) paste(rev(round(v,6)), collapse = ",")), collapse = "|"), sep = "")
}
else {
paste("visible=", paste(visible, collapse = "|"),
sep = "")
}
}
else {
""
}
style_url <- if (!missing(style)) {
paste("style=", style)
}
else {
""
}
sensor_url <- paste("sensor=", tolower(as.character(sensor)),
sep = "")
#修改3
post_url <- paste(center_url, zoom_url, size_url, scale_url,
format_url, language_url, region_url, markers_url,
path_url, visible_url, style_url, sep = "&")
url <- paste(base_url, post_url, sep = "")
url <- gsub("[&]+", "&", url)
if (substr(url, nchar(url), nchar(url)) == "&") {
url <- substr(url, 1, nchar(url) - 1)
}
url <- URLencode(url)
if (urlonly)
return(url)
if (nchar(url) > 2048)
stop("max url length is 2048 characters.", call. = FALSE)
destfile <- if (format %in% c("png8", "png32")) {
paste(filename, "png", sep = ".")
}
else if (format %in% c("jpg", "jpg-baseline")) {
paste(filename, "jpg", sep = ".")
}
else {
paste(filename, "gif", sep = ".")
}
download.file(url, destfile = destfile, quiet = !messaging,
mode = "wb")
#message(paste0("Map from URL : ", url))
#message("Google Maps API Terms of Service : <a href="http://developers.google.com/maps/terms" rel="nofollow">http://developers.google.com/maps/terms</a>")
map <- readPNG(destfile)
if (color == "color") {
map <- apply(map, 2, rgb)
}
else if (color == "bw") {
mapd <- dim(map)
map <- gray(0.3 * map[, , 1] + 0.59 * map[, , 2] + 0.11 *
map[, , 3])
dim(map) <- mapd[1:2]
}
class(map) <- c("ggmap", "raster")
if (is.character(center))
center <- as.numeric(geocode(center))
#修改六，发现谷妹度嫂的坐标变换关系不一致
#我采集了一些点分析百度坐标的变换关系测试，发现度嫂的坐标变换极大可能是平面变换。。。。
ll <- center-c(2.3552/2^zoom * size[1]/2,1.814528/2^zoom * size[2]/2)
ur <- center+c(2.3552/2^zoom * size[1]/2,1.814528/2^zoom * size[2]/2)
#ll <- XY2LatLon(list(lat = center[2], lon = center[1], zoom = zoom-1),
# -size[1]/2 + 0.5, -size[2]/2 - 0.5)
#ur <- XY2LatLon(list(lat = center[2], lon = center[1], zoom = zoom-1),
# size[1]/2 + 0.5, size[2]/2 - 0.5)
attr(map, "bb") <- data.frame(ll.lat = ll[2], ll.lon = ll[1],
ur.lat = ur[2], ur.lon = ur[1])
#修改七
map<-t(map)
dim(map)<-c(size[2],size[1])
map
}
###################################################################################################
dubigmap<-function(center=c(116.403874,39.914888),zoom=13,lgsize=2){
#缺了这句
size<-c(300,300)
des<-c(2.3313056/2^zoom * size[1], 1.86832416/2^zoom * size[2])
#map<-vector("list",(lgsize*2-1)^2)
#map<-getdumap(center=c(116.403874,39.914888),zoom,size)
for(i in 1:(lgsize*2-1)){
for(j in 1:(lgsize*2-1)){
maptmp<-getdumap(center +c(des[1],des[2])*c(i-lgsize,j-lgsize),zoom,size)
if(j==1){
if(i==1){
xmin <- attr(maptmp, "bb")$ll.lon
ymin <- attr(maptmp, "bb")$ll.lat
}
maplat<-maptmp
}else{
maplat<-cbind(maptmp,maplat)
}
}
if(i==1){
map<-maplat
}else{
map<-rbind(map,maplat)
}
}
xmax <- attr(maptmp, "bb")$ur.lon
ymax <- attr(maptmp, "bb")$ur.lat
class(map) <- c("ggmap", "raster")
attr(map, "bb") <- data.frame(ll.lat = ymin, ll.lon = xmin,ur.lat = ymax, ur.lon = xmax)
map
#map2<-getdumap(center=c(116.403874,39.914888)+c(des[1],0),zoom,size)
}
###################################################################################################
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