#set up shapefile for output
w = shapefile.Writer(shapefile.POINT)
w.field('DGGSrHEALPix', 'C', '20')
w.field('LongiWGS84', 'C',
'20') #using 'C' = character = ensures the correct number
w.field('LatiWGS84', 'C', '20')
w.field('Approx_width', 'C', '20')
w.field('DGGS_reso', 'C', '20')
w.field('LGAcode', 'C', '20')
w.field('Name', 'C', '20')
w.field('dggs_cell', 'C', '100')
# make an dggs instance
rdggs = RHEALPixDGGS()
# open a shape file to get your polygons from
myFile = r'\\xxxxxxxxxx\LGA_2018_no_multipart.shp' #LGS's can be downloaded from ABS?
# read in the file
r = shapefile.Reader(myFile)
# get the attribute table records (combined with shapes) ie shapeRecords
shapeRecs = r.shapeRecords()
# function to write a list to a csv file
# requires the list and the filename to save it too
def write_list_to_file(myList, filename):
"""Write the list to csv file."""
reads a csv of DGGS corners generated by add_DGGS.py
and converts it into a shapefile centroids useing the DGGS cell reference
NB: Not sure of the accuracy of shapefile - seems to be working in total confirmity with other datasets - worked into arcGiS
Joseph Bell Geoscience Australia
'''
import shapefile
import csv
#import dggs
from auspixdggs.auspixengine.dggs import RHEALPixDGGS
from auspixdggs.auspixengine.dggs import Cell
import auspixdggs.auspixengine.ellipsoids as ellipsoids
E = ellipsoids.WGS84_ELLIPSOID_DEG
rdggs = RHEALPixDGGS(ellipsoid=E, north_square=1, south_square=2, N_side=3)
from geopy import distance
# read the file
# file with the source data
f = r"\\xxxxx\Geonames_withDGGS.csv"
#set up shapefile for output
w = shapefile.Writer(shapefile.POINT)
w.field('ID', 'C', '20')
w.field('Name', 'C', '70')
w.field('DGGSrHEALPix', 'C', '20')
w.field('LongiWGS84', 'C',
'20') #using 'C' = character = ensures the correct number
'''
this script uses the DGGS engine to calculate the DGGS cells within a polygon
- it reads in a shapefile, but could be adapted to read in other spatial info - eg postGIS
- outputs another shapefile for visualisation and integration
- could also be adapted to export as csv or triple etc
- depends on the 'dggs_in_poly' GA module which does much of the work - see AusPIX enablement folder Git
Written by Joseph Bell at Geoscience Australia 2019
'''
import shapefile #to read and write shapefiles
import auspixdggs.callablemodules.dggs_in_poly # this is script written by GA - see GitHub AusPix DGGS enablement folder
from auspixdggs.auspixengine.dggs import RHEALPixDGGS
rdggs = RHEALPixDGGS() # make an instance
# identify a shape file to get your polygons from
myFile = r'C:\xxxxxxxxxx\AusPIX_DGGS\test_data\testPoly\testPoly3.shp'
r = shapefile.Reader(myFile) # read in the file
# get the attribute table records (combined with shapes) ie shapeRecords
shapeRecs = r.shapeRecords()
resolution = 10 # set resolution to be used
#set up shapefile for output
w = shapefile.Writer(shapefile.POINT) # in this case points == centroids of cells
w.field('DGGSrHEALPix', 'C', '20')
w.field('LongiWGS84', 'C', '20') #using 'C' = character = ensures the correct number
w.field('LatiWGS84', 'C', '20')
w.field('DGGS_reso', 'C', '20')
w.field('SA1code', 'C', '20')
w.field('SA2Name', 'C', '20')
def get_data_list(myFile):
#set up shapefile for output
w = shapefile.Writer(shapefile.POINT)
w.field('DGGSrHEALPix', 'C', '20')
w.field('LongiWGS84', 'C',
'20') #using 'C' = character = ensures the correct number
w.field('LatiWGS84', 'C', '20')
w.field('Approx_width', 'C', '20')
w.field('DGGS_reso', 'C', '20')
w.field('LGAcode', 'C', '20')
w.field('Name', 'C', '20')
w.field('dggs_cell', 'C', '100')
# make an dggs instance
rdggs = RHEALPixDGGS()
# open a shape file to get your polygons from
#myFile = r'\\prod.lan\active\ops\nlib\NLI Reform Project\Place Names Linked Data Project\Meshblocks\1270055001_sa1_2016_aust_shape\SA1_2016_AUST.shp'
#myFile = r'\\prod.lan\active\ops\nlib\NLI Reform Project\Place Names Linked Data Project\LGA\SA1_ACT_2016.shp'
#myFile = '../test_data/ACT_SA1/SA1_ACT_2016.shp'
#SA1's can be downloaded from ABS?
# read in the file
r = shapefile.Reader(myFile)
# get the attribute table records (combined with shapes) ie shapeRecords
shapeRecs = r.shapeRecords()
#
#
# function to write a list to a csv file
# requires the list and the filename to save it too
#
#
# # set the resolution between about 2 to 12 - bigger numbers mean smaller cells
# # resolution = 9
csvOutput = list() # initialise
dataList = list()
dataList.append(('SA1code', 'SA2name16', 'Areakmsq', 'Num_cells', 'DGGS'))
for feature in shapeRecs: # slice of x polygons from the whole shapefile [0:20]
newRow = list()
# filter out the ACT SA1's
if feature.record[8] == 'Australian Capital Territory':
# in ACT
print(feature.record[0], feature.record[4], feature.record[13])
# thisRecord = feature.record[0:] # the attribute table record
# print('len of record', len(thisRecord))
# print(thisRecord)
# print('found LGA called ', thisRecord[2])
#
polyShape = feature.shape # get the spatial component
polyRecord = feature.record # get the attributes record (row)
area = float(
feature.record[13]
) # needs to point to the area of the polygon in the data sqkm
print('Area', area)
print(type(area))
#
#
resolution = 10 # default resolution
# vary resolution based on area so bigger areas have bigger cells
# if area < 1:
# resolution = 12
# elif area > 1 and area < 1000.0:
# resolution = 9
# elif area > 1000.0 and area < 30000.0:
# resolution = 6
# elif area > 30000:
# resolution = 4
print('using resolution ', resolution)
# calculate the approx cell width at this resolution
thisWidthApprox = rdggs.cell_width(
resolution, plane=True
) # note only approx because we are using the planar to estimate elipsoidal
print('++++++++++ Cell width approx +++', thisWidthApprox, 'm')
thisSA1 = feature.record[0]
thisName = feature.record[2]
#
# call the "call_DGGS" function to return all the DGGS cells (within polygon only)
cells_in_poly = call_DGGS.poly_to_DGGS_tool(
polyShape, polyRecord, resolution)
print('number in polygon = ', len(cells_in_poly))
#
# print ('Reducing . . . ')
# # reduce to biggest cells
# theseReducedCells = call_DGGS.coalesce(cells_in_poly)
# #print('reduced cells =', theseReducedCells)
# print('1st number reduced cells =', len(theseReducedCells))
#
# # reduce again
# theseReducedCells = call_DGGS.coalesce(theseReducedCells)
# #print('2nd reduced cells =', theseReducedCells)
# print('2nd number reduced cells =', len(theseReducedCells))
# #
# # reduce again
# theseReducedCells = call_DGGS.coalesce(theseReducedCells)
# # print('3nd reduced cells =', theseReducedCells)
# print('3nd number reduced cells =', len(theseReducedCells))
#
# # reduce again
# theseReducedCells = call_DGGS.coalesce(theseReducedCells)
# # print('3nd reduced cells =', theseReducedCells)
# print('4nd number reduced cells =', len(theseReducedCells))
#
# # # reduce again
# # theseReducedCells = call_DGGS.coalesce(theseReducedCells)
# # # print('3nd reduced cells =', theseReducedCells)
# # print('5nd number reduced cells =', len(theseReducedCells))
#
#newRow.append((feature.record[0], feature.record[4], feature.record[13], len(theseReducedCells), theseReducedCells))
dataList.append(
(feature.record[0], feature.record[4], feature.record[13],
len(cells_in_poly), cells_in_poly))
#print()
#print()
#for item in dataList:
# print(item)
return dataList