Scal wielokąty geojson ze współrzędną WGS84

9

Mam plik Geojson z kilkoma sąsiadującymi wielokątami i chcę je połączyć w jeden. Wiem, że to powtarzające się pytanie, ale nie mogę znaleźć informacji o wielokątach o współrzędnych szerokości i długości geograficznej, jak w tym geojsonie:

{
"type": "FeatureCollection",
"features": [{
    "type": "Feature",
    "id": "16966",
    "properties": {
        "Name": "BEYNES"
    },
    "geometry": {
        "type": "Polygon",
        "coordinates": [
            [
                [1.874862143378, 48.834371283832],
                [1.8656030688715, 48.831612507285],
                [1.8515105581603, 48.834338209867],
                [1.8466221791684, 48.828669687135],
                [1.8415374906793, 48.828818416443],
                [1.8392188748285, 48.830163082204],
                [1.8419058888315, 48.843509743804],
                [1.8472716401406, 48.849200964455],
                [1.8375210341485, 48.856814659389],
                [1.8383984699903, 48.87125874614],
                [1.8572939822902, 48.871944300476],
                [1.874663272221, 48.877028568925],
                [1.8831026195664, 48.874535338148],
                [1.9127169447188, 48.860849357594],
                [1.9030441003473, 48.846352529476],
                [1.8932786620468, 48.847377864779],
                [1.8885787644301, 48.846659731042],
                [1.8820915893247, 48.834609966105],
                [1.874862143378, 48.834371283832]
            ]
        ]
    }
}, {
    "type": "Feature",
    "id": "19484",
    "properties": {
        "Name": "VILLIERS-LE-MAHIEU"
    },
    "geometry": {
        "type": "Polygon",
        "coordinates": [
            [
                [1.7780400297013, 48.832305931728],
                [1.7734339848429, 48.83177307884],
                [1.7611156919393, 48.841036344684],
                [1.7664174460888, 48.850202460021],
                [1.7590182348483, 48.858733519882],
                [1.7586155859222, 48.868766940337],
                [1.7751309254077, 48.872615718624],
                [1.7866538204874, 48.862012015338],
                [1.7869427495986, 48.855458134055],
                [1.7916969548512, 48.854399942691],
                [1.7780400297013, 48.832305931728]
            ]
        ]
    }
}, {
    "type": "Feature",
    "id": "19635",
    "properties": {
        "Name": "THOIRY"
    },
    "geometry": {
        "type": "Polygon",
        "coordinates": [
            [
                [1.7916969548512, 48.854399942691],
                [1.7869427495986, 48.855458134055],
                [1.7866538204874, 48.862012015338],
                [1.7751309254077, 48.872615718624],
                [1.7890825137274, 48.88596098882],
                [1.809924587051, 48.885828200975],
                [1.8232153433812, 48.876452907166],
                [1.8120930366694, 48.869687419516],
                [1.8059996841005, 48.860128943481],
                [1.7916969548512, 48.854399942691]
            ]
        ]
    }
}, {
    "type": "Feature",
    "id": "22025",
    "properties": {
        "Name": "SAINT-GERMAIN-DE-LA-GRANGE"
    },
    "geometry": {
        "type": "Polygon",
        "coordinates": [
            [
                [1.9130661363292, 48.819937951319],
                [1.9012689316149, 48.821961792363],
                [1.8902265103296, 48.83135783825],
                [1.8813533302838, 48.831553995346],
                [1.8820915893247, 48.834609966105],
                [1.8885787644301, 48.846659731042],
                [1.8932786620468, 48.847377864779],
                [1.918172631346, 48.835751243515],
                [1.9217370910726, 48.82612360123],
                [1.9178385858043, 48.820341013587],
                [1.9130661363292, 48.819937951319]
            ]
        ]
    }
}, {
    "type": "Feature",
    "id": "22141",
    "properties": {
        "Name": "MARCQ"
    },
    "geometry": {
        "type": "Polygon",
        "coordinates": [
            [
                [1.8248465610939, 48.850691703059],
                [1.8126901224641, 48.853063092402],
                [1.8059996841005, 48.860128943481],
                [1.8120930366694, 48.869687419516],
                [1.8232153433812, 48.876452907166],
                [1.832123740674, 48.878689723796],
                [1.8383984699903, 48.87125874614],
                [1.8375210341485, 48.856814659389],
                [1.8246539514431, 48.853792824064],
                [1.8248465610939, 48.850691703059]
            ]
        ]
    }
}, {
    "type": "Feature",
    "id": "23142",
    "properties": {
        "Name": "PLAISIR"
    },
    "geometry": {
        "type": "Polygon",
        "coordinates": [
            [
                [1.9859353011511, 48.799648360798],
                [1.9700422200803, 48.799863243499],
                [1.9568703127355, 48.789270428369],
                [1.9412379043212, 48.791543482649],
                [1.9149109434793, 48.802631449948],
                [1.9130661363292, 48.819937951319],
                [1.9178385858043, 48.820341013587],
                [1.9217370910726, 48.82612360123],
                [1.9308900413011, 48.82617879826],
                [1.9432582596776, 48.836964867387],
                [1.9687926794162, 48.834831269347],
                [1.9700860589995, 48.83487839014],
                [1.9668984852354, 48.821791311587],
                [1.9864791162903, 48.799688951127],
                [1.9859353011511, 48.799648360798]
            ]
        ]
    }
}, {
    "type": "Feature",
    "id": "25041",
    "properties": {
        "Name": "NEAUPHLE-LE-CHATEAU"
    },
    "geometry": {
        "type": "Polygon",
        "coordinates": [
            [
                [1.9149109434793, 48.802631449948],
                [1.898492103809, 48.809622894015],
                [1.8936915762635, 48.808670122548],
                [1.8889579820032, 48.809057956502],
                [1.9012689316149, 48.821961792363],
                [1.9130661363292, 48.819937951319],
                [1.9149109434793, 48.802631449948]
            ]
        ]
    }
}, {
    "type": "Feature",
    "id": "25042",
    "properties": {
        "Name": "VICQ"
    },
    "geometry": {
        "type": "Polygon",
        "coordinates": [
            [
                [1.8479013041869, 48.812707864194],
                [1.8290034942099, 48.811265015475],
                [1.8111878056542, 48.814965840962],
                [1.8138162274863, 48.821557956532],
                [1.8061163949282, 48.830053068487],
                [1.8260692281346, 48.8296929387],
                [1.8327204785815, 48.833814514469],
                [1.8392188748285, 48.830163082204],
                [1.8415374906793, 48.828818416443],
                [1.8479013041869, 48.812707864194]
            ]
        ]
    }
}, {
    "type": "Feature",
    "id": "28635",
    "properties": {
        "Name": "ANDELU"
    },
    "geometry": {
        "type": "Polygon",
        "coordinates": [
            [
                [1.8232153433812, 48.876452907166],
                [1.809924587051, 48.885828200975],
                [1.7890825137274, 48.88596098882],
                [1.7831043145867, 48.891413707227],
                [1.8056581682382, 48.898808951748],
                [1.8355241961203, 48.88517153445],
                [1.832123740674, 48.878689723796],
                [1.8232153433812, 48.876452907166]
            ]
        ]
    }
}, {
    "type": "Feature",
    "id": "29431",
    "properties": {
        "Name": "GOUPILLIERES"
    },
    "geometry": {
        "type": "Polygon",
        "coordinates": [
            [
                [1.7586155859222, 48.868766940337],
                [1.7399133540032, 48.871449653856],
                [1.7412768098614, 48.874270196957],
                [1.7500295563815, 48.875450216663],
                [1.7522176666426, 48.87802738985],
                [1.7483369243043, 48.879497893862],
                [1.7704322974105, 48.896069058229],
                [1.7831043145867, 48.891413707227],
                [1.7890825137274, 48.88596098882],
                [1.7751309254077, 48.872615718624],
                [1.7586155859222, 48.868766940337]
            ]
        ]
    }
}, {
    "type": "Feature",
    "id": "30394",
    "properties": {
        "Name": "SAULX-MARCHAIS"
    },
    "geometry": {
        "type": "Polygon",
        "coordinates": [
            [
                [1.8392188748285, 48.830163082204],
                [1.8327204785815, 48.833814514469],
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                [1.8246539514431, 48.853792824064],
                [1.8375210341485, 48.856814659389],
                [1.8472716401406, 48.849200964455],
                [1.8419058888315, 48.843509743804],
                [1.8392188748285, 48.830163082204]
            ]
        ]
    }
}, {
    "type": "Feature",
    "id": "34743",
    "properties": {
        "Name": "OSMOY"
    },
    "geometry": {
        "type": "Polygon",
        "coordinates": [
            [
                [1.7164466657999, 48.854920532859],
                [1.7052218923542, 48.860142271734],
                [1.7018533752573, 48.865673293225],
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                [1.7274882838909, 48.859337782823],
                [1.7164466657999, 48.854920532859]
            ]
        ]
    }
}, {
    "type": "Feature",
    "id": "35495",
    "properties": {
        "Name": "FLEXANVILLE"
    },
    "geometry": {
        "type": "Polygon",
        "coordinates": [
            [
                [1.7400314884878, 48.837820948808],
                [1.7329083268502, 48.84610157804],
                [1.7189195066054, 48.848587971564],
                [1.7164466657999, 48.854920532859],
                [1.7274882838909, 48.859337782823],
                [1.7292022608762, 48.871219483604],
                [1.7314395279166, 48.873968471423],
                [1.7399133540032, 48.871449653856],
                [1.7586155859222, 48.868766940337],
                [1.7590182348483, 48.858733519882],
                [1.7664174460888, 48.850202460021],
                [1.7611156919393, 48.841036344684],
                [1.7400314884878, 48.837820948808]
            ]
        ]
    }
}, {
    "type": "Feature",
    "id": "36858",
    "properties": {
        "Name": "THIVERVAL-GRIGNON"
    },
    "geometry": {
        "type": "Polygon",
        "coordinates": [
            [
                [1.9687926794162, 48.834831269347],
                [1.9432582596776, 48.836964867387],
                [1.9308900413011, 48.82617879826],
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                [1.9030441003473, 48.846352529476],
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            ]
        ]
    }
}, {
    "type": "Feature",
    "id": "37629",
    "properties": {
        "Name": "NEAUPHLE-LE-VIEUX"
    },
    "geometry": {
        "type": "Polygon",
        "coordinates": [
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}, {
    "type": "Feature",
    "id": "38841",
    "properties": {
        "Name": "MONTAINVILLE"
    },
    "geometry": {
        "type": "Polygon",
        "coordinates": [
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                [1.8383984699903, 48.87125874614],
                [1.832123740674, 48.878689723796],
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                [1.8585137392849, 48.890942160516],
                [1.8687589726649, 48.885193372296],
                [1.874663272221, 48.877028568925],
                [1.8572939822902, 48.871944300476],
                [1.8383984699903, 48.87125874614]
            ]
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    }
}, {
    "type": "Feature",
    "id": "43121",
    "properties": {
        "Name": "VILLIERS-SAINT-FREDERIC"
    },
    "geometry": {
        "type": "Polygon",
        "coordinates": [
            [
                [1.8850727051194, 48.805432976807],
                [1.8689494730467, 48.8130077893],
                [1.8658960165459, 48.822530967257],
                [1.874862143378, 48.834371283832],
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                [1.8813533302838, 48.831553995346],
                [1.8902265103296, 48.83135783825],
                [1.9012689316149, 48.821961792363],
                [1.8889579820032, 48.809057956502],
                [1.8936915762635, 48.808670122548],
                [1.8940011070565, 48.805632849681],
                [1.8850727051194, 48.805432976807]
            ]
        ]
    }
}]

}

surowe wielokąty

Czy istnieje sposób na zbudowanie głównego wielokąta z zewnętrzną formą wszystkich wielokątów?

henri_1310
źródło

Odpowiedzi:

13

Możesz do tego użyć Mapshaper , a następnie rozpuścić z wiersza poleceń:

mapshaper --dissolve -i your_data.geojson
jmcbroom
źródło
2
Świetne narzędzie. Jeśli pojawią się błędy składniowe, spróbuj takmapshaper -i your_data.geojson --dissolve
Kyle Hotchkiss
Świetna wskazówka @KyleHotchkiss, dzięki
Ricardo Mayerhofer
4

Z QGis jest to łatwe.

  1. Otwórz QGis
  2. Przeciągnij i upuść plik geojson do qgis
  3. użyj narzędzia „rozpuść” w menu wektorowym (znajduje się ono w podmenu). użyj opcji „rozpuść wszystko” z menu rozwijanego
  4. utworzy to plik kształtu (zaznacz pole, aby wyświetlić mapę)
  5. który możesz następnie ponownie zapisać jako plik geojson, klikając go prawym przyciskiem myszy w panelu warstwy i wybierając „zapisz jako”, a następnie geojson jako format

„Rozpuszczanie” to nazwa żądanej operacji. Może to również dać ci dodatkowe wskazówki dotyczące google.

til_b
źródło
1
dzięki til_b za twoją propozycję, używam jayarem, ale twoja też wygląda ładnie, ale mniej skalowalnie
henri_1310
Tak, jest mniej skalowalny. Nie wiedziałem wcześniej o mapshaperze - nauczyłem się także nowych rzeczy!
til_b
Dzięki za wskazanie mi narzędzia rozpuszczania. Śledziłem twoje kroki i prawie dostałem to, czego chciałem, z wyjątkiem błędu poniżej. Wygenerował żądaną warstwę, z wyjątkiem tego, że funkcja 44 została wycięta. Wszelkie sugestie, jak dowiedzieć się, co dokładnie było nieprawidłowe? Komunikat o błędzie: Element (44) ma nieprawidłową geometrię i został pominięty. Popraw geometrię lub zmień ustawienie Przetwarzanie na opcję „Ignoruj ​​nieprawidłowe funkcje wprowadzania”.
carpiediem
1
Rozumiem. Przybornik> Geometria wektorowa> Napraw geometrie
carpiediem
2

Jeśli chcesz zrobić algorytm, oto fragment kodu python:

#!/usr/bin/env python

from json import load, JSONEncoder
from argparse import ArgumentParser, FileType
from re import compile
import sys

from shapely.geometry import Polygon, mapping
from shapely.ops import cascaded_union


parser = ArgumentParser(description="Group (merge) the GeoJSON geometries of same vehicles with different day index.")

defaults = dict(outfile=sys.stdout)

parser.set_defaults(**defaults)

parser.add_argument('infile', type=FileType('r'), help='GeoJSON file whose vehicles will be merged')

parser.add_argument('-o', '--outfile', dest='outfile', type=FileType('wb', 0), help='Outfile')


if __name__ == '__main__':
    args = parser.parse_args()
    infile = args.infile
    outfile = args.outfile

    file = load(infile)

    polygons = []

    for feat in file['features']:
        polygon = Polygon([ (coor[0], coor[1]) for coor in  feat['geometry']['coordinates'][0] ])
        polygons.append(polygon)

    new_geometry = mapping(cascaded_union(polygons)) # This line merges the polygones

    new_feature = dict(type='Feature', id="", properties=dict(Name=""),geometry=dict(type=new_geometry['type'], coordinates=new_geometry['coordinates']))

    outjson = dict(type='FeatureCollection', features=[new_feature])

    encoder = JSONEncoder(separators=(',', ':'))
    encoded = encoder.iterencode(outjson)

    output = outfile

    for token in encoded:
        output.write(token)

który zwraca następujące dane wyjściowe dla powyższego wejścia

wizerunek

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "id": "",
      "properties": {
        "Name": ""
      },
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              1.7780400297013,
              48.832305931728
            ],
            [
              1.7734339848429,
              48.83177307884
            ],
            [
              1.7611156919393,
              48.841036344684
            ],
            [
              1.7400314884878,
              48.837820948808
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              1.7329083268502,
              48.84610157804
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}
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