dieghernan
commented
8 months ago Hi,
Yes, thta's expected since the "INLAND dataset as provided by GISCO is not labelled in a consistent way, and the parameter country is ignored. I should document this better, I think.
Long explanation
There is a variable in that dataset named CNTR_CODE, but it just includes one of the countries to which the border belongs to. This makes very difficult to extract all the borders of a single country with a filter. Let me explain:
library(giscoR)
library(sf)
#> Linking to GEOS 3.8.0, GDAL 3.0.4, PROJ 6.3.1; sf_use_s2() is TRUE
library(tidyverse)
khm01 <- gisco_get_countries(resolution = "01", country = "KHM", spatialtype = "INLAND", cache_dir = "downloads/gisco")
plot(st_geometry(khm01))
This is where you are at this moment. See the variables of the dataset.
glimpse(khm01)
#> Rows: 540
#> Columns: 11
#> $ EU_FLAG <chr> "F", "F", "F", "F", "F", "F", "F", "F", "F", "F", "F", "F…
#> $ OTHR_FLAG <chr> "T", "T", "T", "T", "T", "T", "T", "T", "T", "T", "T", "T…
#> $ COAS_FLAG <chr> "F", "F", "F", "F", "F", "F", "F", "F", "F", "F", "F", "F…
#> $ FID <dbl> 2279, 6149, 6175, 6902, 6435, 6911, 6914, 6307, 6555, 505…
#> $ EFTA_FLAG <chr> "F", "F", "F", "F", "F", "F", "F", "F", "F", "F", "F", "F…
#> $ CC_FLAG <chr> "F", "F", "F", "F", "F", "F", "F", "F", "F", "F", "F", "F…
#> $ CNTR_BN_ID <dbl> 2279, 6149, 6175, 6902, 6435, 6911, 6914, 6307, 6555, 505…
#> $ POL_STAT <dbl> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, …
#> $ CNTR_BN_CODE <dbl> 2279, 6149, 6175, 6902, 6435, 6911, 6914, 6307, 6555, 505…
#> $ CNTR_CODE <chr> "CL", "SZ", "BO", "ZA", "PY", "NA", "PY", "ZA", "ZA", "BR…
#> $ geometry <LINESTRING [°]> LINESTRING (-68.60748 -54.8..., LINESTRING (32…
One may think that filtering by CNTR_CODE == "KH" would be enough, but check this. If I get which borders touches with the country polygon...
khm_cntry <- gisco_get_countries(resolution = "01", country = "KHM", cache_dir = "downloads/gisco")
# Get actual borders
inlands <- khm01[st_intersects(khm01, khm_cntry, sparse = FALSE), ]
inlands
#> Simple feature collection with 5 features and 10 fields
#> Geometry type: LINESTRING
#> Dimension: XY
#> Bounding box: xmin: 102.1439 ymin: 10.40613 xmax: 107.704 ymax: 22.40069
#> Geodetic CRS: WGS 84
#> EU_FLAG OTHR_FLAG COAS_FLAG FID EFTA_FLAG CC_FLAG CNTR_BN_ID POL_STAT
#> 135 F T F 18321 F F 18321 0
#> 152 F T F 19933 F F 19933 0
#> 165 F T F 18184 F F 18184 0
#> 197 F T F 17582 F F 17582 0
#> 288 F T F 21207 F F 21207 0
#> CNTR_BN_CODE CNTR_CODE geometry
#> 135 18321 VN LINESTRING (107.5561 14.686...
#> 152 19933 LA LINESTRING (105.2001 14.342...
#> 165 18184 TH LINESTRING (102.9109 11.647...
#> 197 17582 VN LINESTRING (106.4434 11.822...
#> 288 21207 VN LINESTRING (102.1439 22.400...
# Get by id
library(ggplot2)
ggplot(inlands) +
geom_sf(aes(color = as_factor(CNTR_BN_ID)))
Note that the borders seems to be right, however CNTR_CODE has values only for Thailand, Laos and Vietnam (TH LA, VN). What we can do is filter by CNTR_BN_CODE to get only the borders of interest (visually).
# Final inland of Cambodia
inland_KHM <- inlands %>%
filter(CNTR_BN_ID != 21207)
ggplot(inland_KHM) +
geom_sf(aes(color = as_factor(CNTR_BN_ID)))
Created on 2024-01-04 with reprex v2.0.2
Entire dataset downloads if any spatialtype is specified. E.g.,
R version 4.3.2 (2023-10-31) Platform: x86_64-pc-linux-gnu (64-bit) Running under: Ubuntu 22.04.3 LTS giscoR_0.4.0