我試圖從httr::GET的服務器下載 rasters，我們曾經有這個工作，但對服務器進行了一些更改，現在它不起作用。
通過瀏覽器或通過終端（ubuntu 16.04）中的 GET 使用 URL 工作正常，并返回一個工作 tif raster。但是使用來自httr::GET的相同 url 不起作用，并給出Status: 400。
我唯一的猜測是它與數據的編碼有關。但我真的不確定。
file <- paste0(tempdir(), '/file.tif')
r <-
httr::GET('https://map.ox.ac.uk/geoserver/Explorer/ows?service=WCS&version=2.0.1&request=GetCoverage&format=image/geotiff&coverageid=2015_Nature_Africa_PR&SUBSET=Long(-3,50.483779907)&SUBSET=Lat(-25.6089496609999,-11.9454326629999)&SUBSET=time(\"2015-01-01T00:00:00.000Z\")',
httr::write_disk(file, overwrite = TRUE))
ras <- raster::raster(file)
# I'm now totally confused about when and where quotes are escaped, so just to make sure...
r <-
httr::GET('https://map.ox.ac.uk/geoserver/Explorer/ows?service=WCS&version=2.0.1&request=GetCoverage&format=image/geotiff&coverageid=2015_Nature_Africa_PR&SUBSET=Long(-3,50.483779907)&SUBSET=Lat(-25.6089496609999,-11.9454326629999)&SUBSET=time("2015-01-01T00:00:00.000Z")',
httr::write_disk(file, overwrite = TRUE))
ras <- raster::raster(file)
# But just putting the url in the browser works fine.
# https://map.ox.ac.uk/geoserver/Explorer/ows?service=WCS&version=2.0.1&request=GetCoverage&format=image/geotiff&coverageid=2015_Nature_Africa_PR&SUBSET=Long(-3,50.483779907)&SUBSET=Lat(-25.6089496609999,-11.9454326629999)&SUBSET=time("2015-01-01T00:00:00.000Z")
# eg
# rr <- raster::raster('~/Desktop/2015_Nature_Africa_PR3.tif')
# And using the URL with GET in the terminal works
# GET "https://map.ox.ac.uk/geoserver/Explorer/ows?service=WCS&version=2.0.1&request=GetCoverage&format=image/geotiff&coverageid=2015_Nature_Africa_PR&SUBSET=Long(-3,50.483779907)&SUBSET=Lat(-25.6089496609999,-11.9454326629999)&SUBSET=time(\"2015-01-01T00:00:00.000Z\")" > ~/Desktop/2015_Nature_Africa_PR4.tif
# eg
# rr <- raster::raster('~/Desktop/2015_Nature_Africa_PR4.tif')
5
包裝在URLEncode為我工作：
library(httr)
library(raster)
file <- paste0(tempdir(), '/file.tif')
url1 <- 'https://map.ox.ac.uk/geoserver/Explorer/ows?service=WCS&version=2.0.1&request=GetCoverage&format=image/geotiff&coverageid=2015_Nature_Africa_PR&SUBSET=Long(-3,50.483779907)&SUBSET=Lat(-25.6089496609999,-11.9454326629999)&SUBSET=time("2015-01-01T00:00:00.000Z")'
r <- GET(URLencode(url1), write_disk(file, overwrite = TRUE))
ras <- raster(file)
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