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什么会导致聚合多边形和光栅数据时丢失值?

r-stars sf r-raster gis r

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CptNemo · 技术社区 · 4 年前

聚合(使用 sf::aggregate()

require(sf)
require(stars)

# Download here => http://www.filedropper.com/adaptorcamsregionalfcretrieve-15879390618606012-22402-6-64f0e215-609d-4ca6-b65c-a9ef7dc53370
raster_file <- 
  "adaptor.cams_regional_fc.retrieve-1587939061.8606012-22402-6-64f0e215-609d-4ca6-b65c-a9ef7dc53370.nc"

# Download here => https://drive.google.com/file/d/1fEhy3V4h1h5efDMrfa0x_mvnx2VL5T66/view?usp=sharing
polygon_file <-
  "hex_ita_1km.sf.RData"
r <- 
  read_stars(raster_file)
load(polygon_file)

st_crs(r) <- 4326
st_crs(hex_ita_1km.sf) <- st_crs(32632)

r 两个变量中都不包含任何缺少的数据

summary(r$pm10_conc)
summary(r$pm2p5_conc)

 Min.   1st Qu.    Median      Mean   3rd Qu.      Max. 
0.08376 4.79556 9.77700 14.13988 18.06134 196.88487
Min.  1st Qu.   Median     Mean  3rd Qu.     Max. 
0.05215 2.08035 4.39209 5.51724 7.46488 54.89545

a <- 
  aggregate(st_transform(r, 32632), 
            by = hex_ita_1km.sf, 
            FUN = mean)

plot(a, border = NA)

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