raster2vector: Converts raster image matrix into list of polygons.
In fasteraster: Raster Image Processing and Vector Recognition
Description
Usage
Arguments
Value
Examples
Description
Takes a raster matrix and vectorize it by polygons. Typically the nature of artefact images is linear
and can be vectorized in much more efficient way than draw a series of 90 degrees lines.
Usage
1
2
raster2vector(raster, from = 0, to = 1, step = 0.1, precision = 1L,
exclave = TRUE)
Arguments
raster
input matrix of numeric values.
from
lower (greater than) margin for recognizable polygon values.
to
upper (less than or equal) margin.
step
values gradient.
precision
linearization precision in matrix cells.
exclave
polygons may have other inside.
Value
list of integer matrixes that represent polygon coordinates in two columns.
Examples
1
2
3
library(datasets)
raster2vector(volcano, 100, 200, 60, 1, FALSE)
raster2vector(volcano, 120, 200, 20)
Example output
[[1]]
[,1] [,2]
[1,] 19 1
[2,] 2 1
[3,] 1 7
[4,] 2 11
[5,] 1 61
[6,] 62 61
[7,] 67 56
[8,] 66 55
[9,] 66 53
[10,] 65 51
[11,] 67 49
[12,] 69 45
[13,] 71 45
[14,] 77 39
[15,] 80 38
[16,] 80 36
[17,] 82 36
[18,] 81 34
[19,] 84 34
[20,] 86 32
[21,] 87 23
[22,] 85 23
[23,] 81 21
[24,] 84 15
[25,] 83 11
[26,] 85 9
[27,] 79 2
[28,] 31 3
[29,] 38 9
[30,] 42 10
[31,] 53 6
[32,] 54 7
[33,] 64 8
[34,] 66 6
[35,] 71 5
[36,] 71 7
[37,] 75 15
[38,] 74 20
[39,] 75 22
[40,] 76 27
[41,] 75 28
[42,] 63 47
[43,] 58 47
[44,] 55 46
[45,] 34 57
[46,] 22 58
[47,] 22 56
[48,] 11 52
[49,] 10 51
[50,] 10 49
[51,] 4 42
[52,] 2 36
[53,] 7 20
[54,] 13 10
[55,] 14 9
[56,] 17 1
[[2]]
[,1] [,2]
[1,] 26 26
[2,] 25 21
[3,] 23 21
[4,] 18 23
[5,] 15 36
[6,] 22 45
[7,] 24 45
[8,] 23 44
[9,] 23 41
[10,] 22 29
[11,] 24 26
[[3]]
[,1] [,2]
[1,] 28 45
[[4]]
[,1] [,2]
[1,] 74 14
[2,] 70 6
[3,] 67 6
[4,] 65 8
[5,] 53 9
[6,] 51 7
[7,] 43 10
[8,] 37 11
[9,] 26 2
[10,] 20 1
[11,] 18 2
[12,] 14 12
[13,] 12 14
[14,] 5 31
[15,] 15 31
[16,] 17 22
[17,] 26 20
[18,] 27 21
[19,] 27 27
[20,] 25 27
[21,] 24 30
[22,] 23 40
[23,] 24 43
[24,] 29 44
[25,] 28 47
[26,] 25 45
[27,] 21 46
[28,] 18 43
[29,] 18 41
[30,] 15 37
[31,] 14 32
[32,] 4 32
[33,] 3 38
[34,] 9 47
[35,] 12 51
[36,] 23 55
[37,] 23 57
[38,] 33 57
[39,] 54 46
[40,] 59 45
[41,] 62 46
[42,] 65 43
[43,] 72 30
[44,] 75 23
[45,] 74 21
[[1]]
[,1] [,2]
[1,] 26 26
[2,] 25 21
[3,] 23 21
[4,] 18 23
[5,] 15 36
[6,] 22 45
[7,] 24 45
[8,] 23 44
[9,] 23 41
[10,] 22 29
[11,] 24 26
[[2]]
[,1] [,2]
[1,] 28 45
[[3]]
[,1] [,2]
[1,] 33 36
[2,] 32 31
[3,] 29 30
[4,] 27 31
[5,] 26 35
[6,] 28 38
[7,] 31 38
[[4]]
[,1] [,2]
[1,] 52 27
[2,] 52 24
[3,] 51 21
[4,] 49 21
[5,] 47 22
[6,] 41 23
[7,] 30 19
[8,] 28 17
[9,] 23 15
[10,] 20 18
[11,] 14 20
[12,] 11 36
[13,] 14 42
[14,] 16 42
[15,] 16 44
[16,] 19 47
[17,] 30 51
[18,] 36 46
[19,] 36 39
[20,] 38 39
[21,] 40 37
[22,] 43 31
[23,] 45 31
[24,] 47 30
[25,] 49 32
[26,] 51 30
[[5]]
[,1] [,2]
[1,] 70 21
[2,] 68 15
[3,] 58 14
[4,] 55 15
[5,] 39 17
[6,] 25 8
[7,] 23 10
[8,] 20 15
[9,] 14 17
[10,] 12 19
[11,] 8 32
[12,] 7 35
[13,] 10 43
[14,] 15 46
[15,] 15 48
[16,] 18 51
[17,] 31 54
[18,] 39 48
[19,] 41 41
[20,] 43 41
[21,] 44 38
[22,] 53 40
[23,] 57 36
[24,] 59 30
[25,] 61 30
[26,] 66 28
[[6]]
[,1] [,2]
[1,] 74 14
[2,] 70 6
[3,] 67 6
[4,] 65 8
[5,] 53 9
[6,] 51 7
[7,] 43 10
[8,] 37 11
[9,] 26 2
[10,] 20 1
[11,] 18 2
[12,] 14 12
[13,] 12 14
[14,] 6 27
[15,] 3 38
[16,] 9 47
[17,] 12 51
[18,] 23 55
[19,] 23 57
[20,] 33 57
[21,] 54 46
[22,] 59 45
[23,] 62 46
[24,] 65 43
[25,] 72 30
[26,] 75 23
[27,] 74 21
fasteraster documentation built on May 2, 2019, 3:35 p.m.
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
Description Usage Arguments Value Examples
Description
Takes a raster matrix and vectorize it by polygons. Typically the nature of artefact images is linear and can be vectorized in much more efficient way than draw a series of 90 degrees lines.
Usage
1 2 | raster2vector(raster, from = 0, to = 1, step = 0.1, precision = 1L,
exclave = TRUE)
|
Arguments
raster |
input matrix of numeric values. |
from |
lower (greater than) margin for recognizable polygon values. |
to |
upper (less than or equal) margin. |
step |
values gradient. |
precision |
linearization precision in matrix cells. |
exclave |
polygons may have other inside. |
Value
list of integer matrixes that represent polygon coordinates in two columns.
Examples
1 2 3 | library(datasets)
raster2vector(volcano, 100, 200, 60, 1, FALSE)
raster2vector(volcano, 120, 200, 20)
|
Example output
[[1]]
[,1] [,2]
[1,] 19 1
[2,] 2 1
[3,] 1 7
[4,] 2 11
[5,] 1 61
[6,] 62 61
[7,] 67 56
[8,] 66 55
[9,] 66 53
[10,] 65 51
[11,] 67 49
[12,] 69 45
[13,] 71 45
[14,] 77 39
[15,] 80 38
[16,] 80 36
[17,] 82 36
[18,] 81 34
[19,] 84 34
[20,] 86 32
[21,] 87 23
[22,] 85 23
[23,] 81 21
[24,] 84 15
[25,] 83 11
[26,] 85 9
[27,] 79 2
[28,] 31 3
[29,] 38 9
[30,] 42 10
[31,] 53 6
[32,] 54 7
[33,] 64 8
[34,] 66 6
[35,] 71 5
[36,] 71 7
[37,] 75 15
[38,] 74 20
[39,] 75 22
[40,] 76 27
[41,] 75 28
[42,] 63 47
[43,] 58 47
[44,] 55 46
[45,] 34 57
[46,] 22 58
[47,] 22 56
[48,] 11 52
[49,] 10 51
[50,] 10 49
[51,] 4 42
[52,] 2 36
[53,] 7 20
[54,] 13 10
[55,] 14 9
[56,] 17 1
[[2]]
[,1] [,2]
[1,] 26 26
[2,] 25 21
[3,] 23 21
[4,] 18 23
[5,] 15 36
[6,] 22 45
[7,] 24 45
[8,] 23 44
[9,] 23 41
[10,] 22 29
[11,] 24 26
[[3]]
[,1] [,2]
[1,] 28 45
[[4]]
[,1] [,2]
[1,] 74 14
[2,] 70 6
[3,] 67 6
[4,] 65 8
[5,] 53 9
[6,] 51 7
[7,] 43 10
[8,] 37 11
[9,] 26 2
[10,] 20 1
[11,] 18 2
[12,] 14 12
[13,] 12 14
[14,] 5 31
[15,] 15 31
[16,] 17 22
[17,] 26 20
[18,] 27 21
[19,] 27 27
[20,] 25 27
[21,] 24 30
[22,] 23 40
[23,] 24 43
[24,] 29 44
[25,] 28 47
[26,] 25 45
[27,] 21 46
[28,] 18 43
[29,] 18 41
[30,] 15 37
[31,] 14 32
[32,] 4 32
[33,] 3 38
[34,] 9 47
[35,] 12 51
[36,] 23 55
[37,] 23 57
[38,] 33 57
[39,] 54 46
[40,] 59 45
[41,] 62 46
[42,] 65 43
[43,] 72 30
[44,] 75 23
[45,] 74 21
[[1]]
[,1] [,2]
[1,] 26 26
[2,] 25 21
[3,] 23 21
[4,] 18 23
[5,] 15 36
[6,] 22 45
[7,] 24 45
[8,] 23 44
[9,] 23 41
[10,] 22 29
[11,] 24 26
[[2]]
[,1] [,2]
[1,] 28 45
[[3]]
[,1] [,2]
[1,] 33 36
[2,] 32 31
[3,] 29 30
[4,] 27 31
[5,] 26 35
[6,] 28 38
[7,] 31 38
[[4]]
[,1] [,2]
[1,] 52 27
[2,] 52 24
[3,] 51 21
[4,] 49 21
[5,] 47 22
[6,] 41 23
[7,] 30 19
[8,] 28 17
[9,] 23 15
[10,] 20 18
[11,] 14 20
[12,] 11 36
[13,] 14 42
[14,] 16 42
[15,] 16 44
[16,] 19 47
[17,] 30 51
[18,] 36 46
[19,] 36 39
[20,] 38 39
[21,] 40 37
[22,] 43 31
[23,] 45 31
[24,] 47 30
[25,] 49 32
[26,] 51 30
[[5]]
[,1] [,2]
[1,] 70 21
[2,] 68 15
[3,] 58 14
[4,] 55 15
[5,] 39 17
[6,] 25 8
[7,] 23 10
[8,] 20 15
[9,] 14 17
[10,] 12 19
[11,] 8 32
[12,] 7 35
[13,] 10 43
[14,] 15 46
[15,] 15 48
[16,] 18 51
[17,] 31 54
[18,] 39 48
[19,] 41 41
[20,] 43 41
[21,] 44 38
[22,] 53 40
[23,] 57 36
[24,] 59 30
[25,] 61 30
[26,] 66 28
[[6]]
[,1] [,2]
[1,] 74 14
[2,] 70 6
[3,] 67 6
[4,] 65 8
[5,] 53 9
[6,] 51 7
[7,] 43 10
[8,] 37 11
[9,] 26 2
[10,] 20 1
[11,] 18 2
[12,] 14 12
[13,] 12 14
[14,] 6 27
[15,] 3 38
[16,] 9 47
[17,] 12 51
[18,] 23 55
[19,] 23 57
[20,] 33 57
[21,] 54 46
[22,] 59 45
[23,] 62 46
[24,] 65 43
[25,] 72 30
[26,] 75 23
[27,] 74 21
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