kidwellj/uk_census_shapes_clipped
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added st_simplify

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This commit is contained in:
Jeremy Kidwell 2022-03-21 18:51:18 +00:00
parent f512a071de
commit 3b48a6639e
1 changed files with 9 additions and 5 deletions
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14
script.R
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@ -3,15 +3,14 @@ require(sf)
# Load admin polygons: # Load admin polygons:
oa11 <- st_read("./data/infuse_oa_lyr_2011.shp") oa11 <- st_read("./data/infuse_oa_lyr_2011.shp")
# download 2011 LSOA polygons - level 2 # download 2011 LSOA polygons - level 2
lsoa11 <- st_read("./data/infuse_lsoa_lyr_2011.shp") lsoa11 <- st_read("./data/infuse_lsoa_lyr_2011.shp")
# download local authorities data for whole UK - level 1 (least detailed) # download local authorities data for whole UK - level 1 (least detailed)
local_authorities <- st_read("data/infuse_dist_lyr_2011.shp") local_authorities <- st_read("data/infuse_dist_lyr_2011.shp")
# Load buildings shapefile: # Load buildings shapefile:
buildings <- st_read("./data/OS_Open_Zoomstack_district_buildings.gpkg") buildings <- st_read("./data/OS_Open_Zoomstack_district_buildings.gpkg")
# open country shapefiles
countries <- st_read("data/infuse_ctry_2011.shp")
# Create modest buffer around quite small building polygons for the sake of visualisation at very large scale where small polygons can appear as points # Create modest buffer around quite small building polygons for the sake of visualisation at very large scale where small polygons can appear as points
buffer <- st_buffer(buildings,150) buffer <- st_buffer(buildings,150)
@ -25,9 +24,11 @@ st_write(difference, "data/local_authorities_cropped_union_buffer_150.gpkg")
inversion <- st_difference(local_authorities$geom, difference) inversion <- st_difference(local_authorities$geom, difference)
# Write results to a file: # Write results to a file:
st_write(inversion, "data/local_authorities_cropped_union_buffer_150_inverted.gpkg") st_write(inversion, "data/local_authorities_cropped_union_buffer_150_inverted.gpkg")
# Create simplified version:
inversion_simplified = st_simplify(inversion, dTolerance = 150) # 150 m
st_write(inversion_simplified, "data/local_authorities_cropped_union_buffer_150_inverted_simplified.gpkg")
# open country shapefiles
countries <- st_read("data/infuse_ctry_2011.shp")
# Create modest buffer around quite small building polygons for the sake of visualisation at very large scale where small polygons can appear as points # Create modest buffer around quite small building polygons for the sake of visualisation at very large scale where small polygons can appear as points
buffer <- st_buffer(buildings,150) buffer <- st_buffer(buildings,150)
# Dissolve and merge overlapping shapes # Dissolve and merge overlapping shapes
@ -40,3 +41,6 @@ st_write(difference, "data/countries_cropped_union_buffer_150.gpkg")
inversion <- st_difference(countries$geom, difference) inversion <- st_difference(countries$geom, difference)
# Write results to a file: # Write results to a file:
st_write(inversion, "data/countries_cropped_union_buffer_150_inverted.gpkg") st_write(inversion, "data/countries_cropped_union_buffer_150_inverted.gpkg")
# Create simplified version:
inversion_simplified = st_simplify(inversion, dTolerance = 150) # 2000 m
st_write(inversion_simplified, "data/countries_cropped_union_buffer_150_inverted_simplified.gpkg")