Uses sp::spsample() with method "random" to produce points, converts back to sf,
and spatial joins with input shp.
Each engine function takes the same arguments and produces comparable outputs.
Final number of points may be approximate for this method.
Examples
set.seed(1)
data('suffolk')
engine_sp_random(suffolk[16:20,], 'pop_nhpi')
#> Simple feature collection with 22 features and 21 fields
#> Geometry type: POINT
#> Dimension: XY
#> Bounding box: xmin: -7914948 ymin: 5206728 xmax: -7907975 ymax: 5212579
#> Projected CRS: WGS 84 / Pseudo-Mercator
#> First 10 features:
#> GEOID NAME pop pop_white pop_black
#> 1 25025000408 0408, Suffolk County, Massachusetts 5671 3212 467
#> 2 25025000408 0408, Suffolk County, Massachusetts 5671 3212 467
#> 3 25025000408 0408, Suffolk County, Massachusetts 5671 3212 467
#> 4 25025000408 0408, Suffolk County, Massachusetts 5671 3212 467
#> 5 25025000408 0408, Suffolk County, Massachusetts 5671 3212 467
#> 6 25025000408 0408, Suffolk County, Massachusetts 5671 3212 467
#> 7 25025000408 0408, Suffolk County, Massachusetts 5671 3212 467
#> 8 25025000408 0408, Suffolk County, Massachusetts 5671 3212 467
#> 9 25025000408 0408, Suffolk County, Massachusetts 5671 3212 467
#> 10 25025000408 0408, Suffolk County, Massachusetts 5671 3212 467
#> pop_hisp pop_aian pop_asian pop_nhpi pop_other pop_two vap vap_white
#> 1 572 1 1131 17 29 242 5527 3177
#> 2 572 1 1131 17 29 242 5527 3177
#> 3 572 1 1131 17 29 242 5527 3177
#> 4 572 1 1131 17 29 242 5527 3177
#> 5 572 1 1131 17 29 242 5527 3177
#> 6 572 1 1131 17 29 242 5527 3177
#> 7 572 1 1131 17 29 242 5527 3177
#> 8 572 1 1131 17 29 242 5527 3177
#> 9 572 1 1131 17 29 242 5527 3177
#> 10 572 1 1131 17 29 242 5527 3177
#> vap_black vap_hisp vap_aian vap_asian vap_nhpi vap_other vap_two dots_type
#> 1 439 531 1 1102 17 28 232 pop_nhpi
#> 2 439 531 1 1102 17 28 232 pop_nhpi
#> 3 439 531 1 1102 17 28 232 pop_nhpi
#> 4 439 531 1 1102 17 28 232 pop_nhpi
#> 5 439 531 1 1102 17 28 232 pop_nhpi
#> 6 439 531 1 1102 17 28 232 pop_nhpi
#> 7 439 531 1 1102 17 28 232 pop_nhpi
#> 8 439 531 1 1102 17 28 232 pop_nhpi
#> 9 439 531 1 1102 17 28 232 pop_nhpi
#> 10 439 531 1 1102 17 28 232 pop_nhpi
#> geometry
#> 1 POINT (-7913715 5211458)
#> 2 POINT (-7913715 5211630)
#> 3 POINT (-7913543 5211630)
#> 4 POINT (-7913715 5211802)
#> 5 POINT (-7913543 5211802)
#> 6 POINT (-7913715 5211974)
#> 7 POINT (-7913543 5211974)
#> 8 POINT (-7913371 5211974)
#> 9 POINT (-7913715 5212146)
#> 10 POINT (-7913543 5212146)