地球地図日本のデータをRで読んだ時のメモ
地球地図というのがあるらしい。データの中身がさっぱりわからないので調べてメモ。
元データ
元データ:http://www.gsi.go.jp/kankyochiri/gm_jpn.html
仕様書:http://www.iscgm.org/gm/spec/gmspec-2.1.pdf
結果
library(rgdal) f <- "C:\\path\\to\\gm-jpn-bnd_u_2_1" ogrListLayers(f) #> [1] "coastl_jpn" "polbnda_jpn" "polbndl_jpn" #> attr(,"driver") #> [1] "ESRI Shapefile" #> attr(,"nlayers") #> [1] 3
20ページあたり。
- coastl: The line where a land mass is in contact with a body of water
- polbndl: A line of demarcation between controlled areas
- polbnda: An area controlled by administrative authority
とりあえずpolbndaを読んでみる。
l <- readOGR(f, layer = "polbnda_jpn", encoding = "UTF-8",verbose = TRUE) glimpse(l@data) #> Observations: 2,914 #> Variables: 9 #> $ f_code (fctr) FA001, FA001, FA001, FA001, FA001, FA001, FA001, FA001, FA001, FA001, FA001, FA001, FA001, FA001, FA001, FA001, FA0... #> $ coc (fctr) JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, ... #> $ nam (fctr) Hokkai Do, Hokkai Do, Hokkai Do, Hokkai Do, Hokkai Do, Hokkai Do, Hokkai Do, Hokkai Do, Hokkai Do, Hokkai Do, Hokka... #> $ laa (fctr) Sapporo Shi, Hakodate Shi, Otaru Shi, Asahikawa Shi, Muroran Shi, Kushiro Shi, Kushiro Shi, Obihiro Shi, Kitami Shi... #> $ pop (int) 1930496, 274485, 127224, 349057, 91276, 180160, -89999999, 169104, 123401, 9801, 87284, 38240, 23451, 174469, 37248,... #> $ ypc (int) 2014, 2014, 2014, 2014, 2014, 2014, 2014, 2014, 2014, 2014, 2014, 2014, 2014, 2014, 2014, 2014, 2014, 2014, 2014, 20... #> $ adm_code (fctr) 01100, 01202, 01203, 01204, 01205, 01206, 01206, 01207, 01208, 01209, 01210, 01211, 01212, 01213, 01214, 01214, 012... #> $ salb (fctr) UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, ... #> $ soc (fctr) JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, JPN, ...
- f_code: FACC feature code
- coc: Country code
- nam: State/Province/Prefecture name
- laa: Local administrative area name
- pop: Population
- ypc: Year of population census
- adm_code: Administrative code
- salb: SALB(Second Administrative Level Boundaries) code(c.f. Core Geo-Database | UNGIWG)
- soc: Source Country or VMA
UNK
はUnknown
らしい。