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geo_geohash_neighbors()

  • Artigo

Calcula os vizinhos de Geohash.

Leia mais sobre geohash.

Syntax

geo_geohash_neighbors(geohash)

Saiba mais sobre as convenções de sintaxe.

Parâmetros

Nome Tipo Obrigatório Descrição
geohash string ✔️ Um valor de barra geográfica como foi calculado por geo_point_to_geohash(). A cadeia de caracteres de faixa geográfica deve ter entre 1 e 18 caracteres.

Retornos

Uma matriz de vizinhos Geohash. Se o Geohash for inválido, a consulta produzirá um resultado nulo.

Exemplos

O exemplo a seguir calcula os vizinhos de Geohash.

Executar a consulta

print neighbors = geo_geohash_neighbors('sunny')

Saída

Vizinhos
["sunnt","sunpj","sunnx","sunpn","sunnv","sunpp","sunnz","sunnw"]

O exemplo a seguir calcula uma matriz de geohash de entrada com seus vizinhos.

Executar a consulta

let geohash = 'sunny';
print cells = array_concat(pack_array(geohash), geo_geohash_neighbors(geohash))

Saída

células
["sunny","sunnt","sunpj","sunnx","sunpn","sunnv","sunpp","sunnz","sunnw"]

O exemplo a seguir calcula a coleção de geometria GeoJSON dos polígonos geoágonos GeoHash.

Executar a consulta

let geohash = 'sunny';
print cells = array_concat(pack_array(geohash), geo_geohash_neighbors(geohash))
| mv-expand cells to typeof(string)
| project polygons = geo_geohash_to_polygon(cells)
| summarize arr = make_list(polygons)
| project geojson = bag_pack("type", "Feature","geometry", bag_pack("type", "GeometryCollection", "geometries", arr), "properties", bag_pack("name", "polygons"))

Saída

geojson
{"type": "Feature","geometry": {"type": "GeometryCollection","geometries": [
{"type":"Polygon","coordinates":[[[42.451171875,23.6865234375],[42.4951171875,23.6865234375],[42.4951171875,23.73046875],[42.451171875,23.73046875],[42.451171875,23.6865234375]]]},
{"type":"Polygon","coordinates":[[[42.4072265625,23.642578125],[42.451171875,23.642578125],[42.451171875,23.6865234375],[42.4072265625,23.6865234375],[42.4072265625,23.642578125]]]},
{"type":"Polygon","coordinates":[[[42.4072265625,23.73046875],[42.451171875,23.73046875],[42.451171875,23.7744140625],[42.4072265625,23.7744140625],[42.4072265625,23.73046875]]]},
{"type":"Polygon","coordinates":[[[42.4951171875,23.642578125],[42.5390625,23.642578125],[42.5390625,23.6865234375],[42.4951171875,23.6865234375],[42.4951171875,23.642578125]]]},
{"type":"Polygon","coordinates":[[[42.451171875,23.73046875],[42.4951171875,23.73046875],[42.4951171875,23.7744140625],[42.451171875,23.7744140625],[42.451171875,23.73046875]]]},
{"type":"Polygon","coordinates":[[[42.4072265625,23.6865234375],[42.451171875,23.6865234375],[42.451171875,23.73046875],[42.4072265625,23.73046875],[42.4072265625,23.6865234375]]]},
{"type":"Polygon","coordinates":[[[42.4951171875,23.73046875],[42.5390625,23.73046875],[42.5390625,23.7744140625],[42.4951171875,23.7744140625],[42.4951171875,23.73046875]]]},
{"type":"Polygon","coordinates":[[[42.4951171875,23.6865234375],[42.5390625,23.6865234375],[42.5390625,23.73046875],[42.4951171875,23.73046875],[42.4951171875,23.6865234375]]]},
{"type":"Polygon","coordinates":[[[42.451171875,23.642578125],[42.4951171875,23.642578125],[42.4951171875,23.6865234375],[42.451171875,23.6865234375],[42.451171875,23.642578125]]]}]},
"properties": {"name": "polygons"}}

O exemplo a seguir calcula uniões de polígonos que representam Geohash e seus vizinhos.

Executar a consulta

let h3cell = 'sunny';
print cells = array_concat(pack_array(h3cell), geo_geohash_neighbors(h3cell))
| mv-expand cells to typeof(string)
| project polygons = geo_geohash_to_polygon(cells)
| summarize arr = make_list(polygons)
| project polygon = geo_union_polygons_array(arr)

Saída

polygon
{"type":"Polygon","coordinates":[[[42.4072265625,23.642578125],[42.451171875,23.642578125],[42.4951171875,23.642578125],[42.5390625,23.642578125],[42.5390625,23.686523437500004],[42.5390625,23.730468750000004],[42.5390625,23.7744140625],[42.4951171875,23.7744140625],[42.451171875,23.7744140625],[42.407226562499993,23.7744140625],[42.4072265625,23.73046875],[42.4072265625,23.6865234375],[42.4072265625,23.642578125]]]}

O exemplo a seguir retorna true devido à entrada inválida do token Geohash.

Executar a consulta

print invalid = isnull(geo_geohash_neighbors('a'))

Saída

inválido
1