Split SpatialLinesDataFrame Konturen nach Ebene

Question

Ich habe eine SpatialLinesDataFrame mit drei Konturen 0.2, 0.5 und 0.95 und möchte in der Lage sein, eine einzelne Ebene für die weitere Berechnung (z. B. über, gIntersect usw.) auswählen.

Ich habe versucht, die data@data$level[[1]] zur Auswahl der ersten Ebene verwenden, aber das nicht

class  : SpatialLinesDataFrame 
features : 3 
extent  : 11.44765, 11.51037, 62.11384, 62.13572 (xmin, xmax, ymin, ymax) 
coord. ref. : +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs +towgs84=0,0,0 
variables : 1 
names  : level 
min values : 0.2 
max values : 0.95 

Formal class 'SpatialLinesDataFrame' [package "sp"] with 4 slots 
    ..@ data  :'data.frame': 3 obs. of 1 variable: 
    .. ..$ level: Factor w/ 3 levels "0.2","0.5","0.95": 1 2 3 
    ..@ lines  :List of 3 
    .. ..$ :Formal class 'Lines' [package "sp"] with 2 slots 
    .. .. .. ..@ Lines:List of 6 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:9, 1:2] 11.5 11.5 11.5 11.5 11.5 ... 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:7, 1:2] 11.5 11.5 11.5 11.5 11.5 ... 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:11, 1:2] 11.5 11.5 11.5 11.5 11.5 ... 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:7, 1:2] 11.5 11.5 11.5 11.5 11.5 ... 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:25, 1:2] 11.5 11.5 11.5 11.5 11.5 ... 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:21, 1:2] 11.5 11.5 11.5 11.5 11.5 ... 
    .. .. .. ..@ ID : chr "C_1" 
    .. ..$ :Formal class 'Lines' [package "sp"] with 2 slots 
    .. .. .. ..@ Lines:List of 10 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:31, 1:2] 11.5 11.5 11.5 11.5 11.5 ... 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:51, 1:2] 11.5 11.5 11.5 11.5 11.5 ... 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:13, 1:2] 11.5 11.5 11.5 11.5 11.5 ... 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:55, 1:2] 11.5 11.5 11.5 11.5 11.5 ... 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:19, 1:2] 11.5 11.5 11.5 11.5 11.5 ... 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:25, 1:2] 11.5 11.5 11.5 11.5 11.5 ... 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:11, 1:2] 11.5 11.5 11.5 11.5 11.5 ... 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:31, 1:2] 11.5 11.5 11.5 11.5 11.5 ... 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:11, 1:2] 11.5 11.5 11.5 11.5 11.5 ... 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:37, 1:2] 11.5 11.5 11.5 11.5 11.5 ... 
    .. .. .. ..@ ID : chr "C_2" 
    .. ..$ :Formal class 'Lines' [package "sp"] with 2 slots 
    .. .. .. ..@ Lines:List of 2 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:173, 1:2] 11.4 11.4 11.4 11.4 11.4 ... 
    .. .. .. .. ..$ :Formal class 'Line' [package "sp"] with 1 slot 
    .. .. .. .. .. .. ..@ coords: num [1:693, 1:2] 11.5 11.5 11.5 11.5 11.5 ... 
    .. .. .. ..@ ID : chr "C_3" 
    ..@ bbox  : num [1:2, 1:2] 11.4 62.1 11.5 62.1 
    .. ..- attr(*, "dimnames")=List of 2 
    .. .. ..$ : chr [1:2] "x" "y" 
    .. .. ..$ : chr [1:2] "min" "max" 
    ..@ proj4string:Formal class 'CRS' [package "sp"] with 1 slot 
    .. .. ..@ projargs: chr "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs +towgs84=0,0,0" 

Answer 1

split(data, data@data$level) 

den Trick Hat funktioniert :)