如何在R或ArcGIS中處理多邊形shapefile中的“孤立孔”？

Question

我試圖使用over函數（rgeos）在兩個多邊形（“grd”和“range”）之間進行空間疊加。

此代碼適用於所有文件但只有一個：

range.grd.overlay <- grd[!is.na(over(grd, range)), ]@data$grdID # get gridcells that overlap with range

並收到此錯誤消息：

Error in createPolygonsComment(p) : 
  rgeos_PolyCreateComment: orphaned hole, cannot find containing polygon for hole at index 9

我知道shapefile中有一個沒有周圍多邊形的洞，但我無法弄清楚如何解決它。 我可以簡單地刪除索引9處的洞嗎？ 怎么樣 ？ 如果您有一個解決方案來修復ArcGIS中的shapefile，那對我來說也沒問題。

非常感謝您的幫助！

此致，卡斯滕

Answer 1

grd和range都屬於SpatialPolygonsDataFrame類。

range有這樣的結構：

> str(range)
Formal class 'SpatialPolygonsDataFrame' [package "sp"] with 5 slots
  ..@ data       :'data.frame': 3 obs. of  17 variables:
  .. ..$ OBJECTID  : int [1:3] 725 726 727
  .. ..$ SPCRECID  : int [1:3] 3313 3313 3313
  .. ..$ DATE_     : Factor w/ 1 level "19/10/2009": 1 1 1
  .. ..$ SCINAME   : Factor w/ 1 level "Synthliboramphus antiquus": 1 1 1
  .. ..$ SOURCE    : Factor w/ 1 level "Gaston & Jones, 1998; Brazil, 2009": 1 1 1
  .. ..$ PRESENCE  : int [1:3] 1 1 1
  .. ..$ ORIGIN    : int [1:3] 1 1 1
  .. ..$ SEASONAL  : int [1:3] 2 1 3
  .. ..$ DATA_SENS : Factor w/ 0 levels: NA NA NA
  .. ..$ SENS_COMM : Factor w/ 0 levels: NA NA NA
  .. ..$ COMPILER  : Factor w/ 1 level "Philip Taylor (BirdLife International)": 1 1 1
  .. ..$ TAX_COM   : Factor w/ 0 levels: NA NA NA
  .. ..$ DIST_COM  : Factor w/ 0 levels: NA NA NA
  .. ..$ REVIEWERS : Factor w/ 0 levels: NA NA NA
  .. ..$ CITATION  : Factor w/ 1 level "BirdLife International and Natureserve (2011) Bird species distribution maps of the world.": 1 1 1
  .. ..$ SHAPE_Leng: num [1:3] 190 209 1240
  .. ..$ SHAPE_Area: num [1:3] 39 16.6 600.8
  .. ..- attr(*, "data_types")= chr [1:17] "N" "N" "C" "C" ...
  ..@ polygons   :List of 3
  .. ..$ :Formal class 'Polygons' [package "sp"] with 5 slots
  .. .. .. ..@ Polygons :List of 138
  .. .. .. .. ..$ :Formal class 'Polygon' [package "sp"] with 5 slots
  .. .. .. .. .. .. ..@ labpt  : num [1:2] 178.6 51.8
  .. .. .. .. .. .. ..@ area   : num 4.58
  .. .. .. .. .. .. ..@ hole   : logi FALSE
  .. .. .. .. .. .. ..@ ringDir: int 1
  .. .. .. .. .. .. ..@ coords : num [1:49, 1:2] 180 180 179 179 179 ...
  .. .. .. .. ..$ :Formal class 'Polygon' [package "sp"] with 5 slots
  .. .. .. .. .. .. ..@ labpt  : num [1:2] -172.2 52.6

... 等等。

grd有這樣的結構：

> str(grd)
Formal class 'SpatialPolygonsDataFrame' [package "sp"] with 5 slots
  ..@ data       :'data.frame': 40680 obs. of  12 variables:
  .. ..$ ID        : int [1:40680] 361 362 363 364 365 366 367 368 369 370 ...
  .. ..$ X_COORD   : num [1:40680] -180 -178 -178 -176 -176 ...
  .. ..$ Y_COORD   : num [1:40680] 79.1 79.1 79.1 79.1 79.1 ...
  .. ..$ ID_1      : Factor w/ 13713 levels "10","10000","10001",..: NA NA NA NA NA NA NA NA NA NA ...
  .. ..$ grdID     : int [1:40680] 1 2 3 4 5 6 7 8 9 10 ...
  .. ..$ ROW       : int [1:40680] 1 1 1 1 1 1 1 1 1 1 ...
  .. ..$ COL       : int [1:40680] 1 2 3 4 5 6 7 8 9 10 ...
  .. ..$ AREA      : num [1:40680] 12364 12364 12364 12364 12364 ...
  .. ..$ PERIMETER : num [1:40680] 445 445 445 445 445 ...
  .. ..$ MAJORITY  : int [1:40680] 0 0 0 0 0 0 0 0 0 0 ...
  .. ..$ PROP0_0062: num [1:40680] 0 0 0 0 0 0 0 0 0 0 ...
  .. ..$ AREA_KM2  : num [1:40680] 0 0 0 0 0 0 0 0 0 0 ...
  .. ..- attr(*, "data_types")= chr [1:12] "N" "N" "N" "C" ...
  ..@ polygons   :List of 40680
  .. ..$ :Formal class 'Polygons' [package "sp"] with 5 slots
  .. .. .. ..@ Polygons :List of 1
  .. .. .. .. ..$ :Formal class 'Polygon' [package "sp"] with 5 slots
  .. .. .. .. .. .. ..@ labpt  : num [1:2] -179.5 79.1
  .. .. .. .. .. .. ..@ area   : num 5.3
  .. .. .. .. .. .. ..@ hole   : logi FALSE
  .. .. .. .. .. .. ..@ ringDir: int 1
  .. .. .. .. .. .. ..@ coords : num [1:13, 1:2] -179 -180 -180 -180 -180 ...
  .. .. .. ..@ plotOrder: int 1
  .. .. .. ..@ labpt    : num [1:2] -179.5 79.1

... 等等。

我從Roger Bivand那里找到了這個幫助，這對三個有問題的文件中的兩個有用 ：

>slot(shape.input, "polygons") <- lapply(slot(shape.input, "polygons"), checkPolygonsHoles)
>range.grd.overlay <- grd[!is.na(over(grd, range)), ]@data$grdID # get gridcells of that overlay with range polygon

但對於第三個文件，修復不起作用。 R會凍結，直到我最終按下Esc，之后我會在嘗試制作空間疊加時得到相同的錯誤消息：

 Error in createPolygonsComment(p) : 
   rgeos_PolyCreateComment: orphaned hole, cannot find containing polygon for hole at index 13