如何处理 R 或 ArcGIS 中面形状文件中的“孤立孔”？

Question

我正在尝试使用over函数（rgeos）在两个多边形（“grd”和“range”）之间制作空间叠加。

此代码适用于所有文件，但有一个文件除外：

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

并获取此错误消息：

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

我知道在shapefile的某个地方有一个没有周围多边形的洞，但我不知道如何解决它。我可以简单地删除索引9处的孔吗？怎样如果您有一个解决方案来修复ArcGIS中的shapefile，这对我来说也很好。

提前非常感谢您的帮助！！

问候，卡斯滕

Answer 1

grd 和 range 都属于 SpatialPolygonsDataFrame 类。

范围有这样的结构：

> 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具有如下结构：

> 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。

我找到了Roger Bivand的帮助，这对三个有问题的文件中的两个有效：

>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

但是对于第三个文件，修复不起作用。R会冻结，直到我最终按下Esc，之后我在尝试进行空间覆盖时会收到相同的错误消息：

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