The functions documented on this page allow users to access geographic database\nfunctions to be used in annotations, aggregations, or filters in Django.
\nContoh:
\n>>> from django.contrib.gis.db.models.functions import Length\n>>> Track.objects.annotate(length=Length('line')).filter(length__gt=100)\nNot all backends support all functions, so refer to the documentation of each\nfunction to see if your database backend supports the function you want to use.\nIf you call a geographic function on a backend that doesn't support it, you'll\nget a NotImplementedError exception.
Ringkasan fungsi:
\nPengukuran | \nHubungan | \nOperasi | \nPenyunting | \nBentuk keluaran | \nBermacam-macam | \n
|---|---|---|---|---|---|
| \n | \n | \n | \n | \n | \n |
| \n | \n | \n | \n | \n | \n |
| \n | \n | \n | \n | \n | \n |
| \n | \n | \n | \n | \n | \n |
| \n | \n | \n | \n | \n | \n |
| \n | \n | \n | \n | \n | \n |
| \n | \n | \n | \n | \n | \n |
AreaLink to this heading#Tersedia: MySQL, Oracle, PostGIS, SpatiaLite
\nAccepts a single geographic field or expression and returns the area of the\nfield as an Area measure.
MySQL and SpatiaLite without LWGEOM don't support area calculations on\ngeographic SRSes.
\n\nAsGeoJSONLink to this heading#Tersedia: PostGIS, SpatiaLite
\nAccepts a single geographic field or expression and returns a GeoJSON representation of the geometry. Note that the result is\nnot a complete GeoJSON structure but only the geometry key content of a\nGeoJSON structure. See also Penserial GeoJSON.
Contoh:
\n>>> City.objects.annotate(json=AsGeoJSON('point')).get(name='Chicago').json\n{"type":"Point","coordinates":[-87.65018,41.85039]}\nArgumen Katakunci | \nDeskripsi | \n
|---|---|
| \nSetel ini menjadi | \n
| \nSetel ini menjadi | \n
| \nIt may be used to specify the number of significant\ndigits for the coordinates in the GeoJSON\nrepresentation -- the default value is 8. | \n
AsGMLLink to this heading#Tersedia: Oracle, PostGIS, SpatiaLite
\nAccepts a single geographic field or expression and returns a Geographic Markup\nLanguage (GML) representation of the geometry.
\nContoh:
\n>>> qs = Zipcode.objects.annotate(gml=AsGML('poly'))\n>>> print(qs[0].gml)\n<gml:Polygon srsName="EPSG:4326"><gml:OuterBoundaryIs>-147.78711,70.245363 ...\n-147.78711,70.245363</gml:OuterBoundaryIs></gml:Polygon>\nArgumen Katakunci | \nDeskripsi | \n
|---|---|
| \nSpecifies the number of significant digits for the\ncoordinates in the GML representation -- the default\nvalue is 8. Ignored on Oracle. | \n
| \nMenentukan versi GML untuk menggunakan: 2 (awalan) atau 3. | \n
AsKMLLink to this heading#Tersedia: PostGIS, SpatiaLite
\nAccepts a single geographic field or expression and returns a Keyhole Markup\nLanguage (KML) representation of the geometry.
\nContoh:
\n>>> qs = Zipcode.objects.annotate(kml=AsKML('poly'))\n>>> print(qs[0].kml)\n<Polygon><outerBoundaryIs><LinearRing><coordinates>-103.04135,36.217596,0 ...\n-103.04135,36.217596,0</coordinates></LinearRing></outerBoundaryIs></Polygon>\nArgumen Katakunci | \nDeskripsi | \n
|---|---|
| \nThis keyword may be used to specify the number of\nsignificant digits for the coordinates in the KML\nrepresentation -- the default value is 8. | \n
AsSVGLink to this heading#Tersedia: PostGIS, SpatiaLite
\nAccepts a single geographic field or expression and returns a Scalable Vector\nGraphics (SVG) representation of the geometry.
\nArgumen Katakunci | \nDeskripsi | \n
|---|---|
| \nIf set to | \n
| \nThis keyword may be used to specify the number of\nsignificant digits for the coordinates in the SVG\nrepresentation -- the default value is 8. | \n
BoundingCircleLink to this heading#Tersedia: PostGIS, Oracle (≥ 12.1.0.2)
\nAccepts a single geographic field or expression and returns the smallest circle\npolygon that can fully contain the geometry.
\nParameter num_seg hanya digunakan pada PostGIS.
CentroidLink to this heading#Tersedia: MySQL, PostGIS, Oracle, SpatiaLite
\nMenerima bidang geografis tunggal atau mengembalikan nilai centroid dari geometri.
DifferenceLink to this heading#Tersedia: MySQL (≥ 5.6.1), PostGIS, Oracle, SpatiaLite
\nMenerima dua bidang geografis atau pernyataan dan mengembalikan perbedaan geometri, yaitu bagian dari geometri A yang tidak berinteraksi dengan geometri B.
\n\nDistanceLink to this heading#Tersedia: MySQL (≥ 5.6.1), PostGIS, Oracle, SpatiaLite
\nAccepts two geographic fields or expressions and returns the distance between\nthem, as a Distance object. On MySQL, a raw\nfloat value is returned when the coordinates are geodetic.
On backends that support distance calculation on geodetic coordinates, the\nproper backend function is automatically chosen depending on the SRID value of\nthe geometries (e.g. ST_DistanceSphere on PostGIS).
\nKetika jarak dihitung dengan kordinat (bersiku-siku) geodetic, seperti halnya dengan awalan SRID WGS84 (4326), anda dapat menyetel argumen kata kunci spheroid untuk memutuskan jika perhitungan harus berdasarkan pada bulatan sederhana (kurang akurat, kurang sumber daya-intensif) atau pada sebuah berbentuk bola (lebih akurat, lebih sumber daya-intensif)
In the following example, the distance from the city of Hobart to every other\nPointField in the AustraliaCity\nqueryset is calculated:
>>> from django.contrib.gis.db.models.functions import Distance\n>>> pnt = AustraliaCity.objects.get(name='Hobart').point\n>>> for city in AustraliaCity.objects.annotate(distance=Distance('point', pnt)):\n... print(city.name, city.distance)\nWollongong 990071.220408 m\nShellharbour 972804.613941 m\nThirroul 1002334.36351 m\n...\nEnvelopeLink to this heading#Tersedia: MySQL, PostGIS, SpatiaLite
\nAccepts a single geographic field or expression and returns the geometry\nrepresenting the bounding box of the geometry.
\nForceRHRLink to this heading#Tersedia: PostGIS
\nAccepts a single geographic field or expression and returns a modified version\nof the polygon/multipolygon in which all of the vertices follow the\nright-hand rule.
\nGeoHashLink to this heading#Tersedia: PostGIS, SpatiaLite (LWGEOM)
\nMenerima bidang geografi tunggal atau pernyataan dan mengembalikan perwakilan GeoHash dari geometri.
\nArgumen kata kunci precision mengendalikan sejumlah karakter dalam hasilnya.
IntersectionLink to this heading#Tersedia: MySQL (≥ 5.6.1), PostGIS, Oracle, SpatiaLite
\nMenerima dua bidang geografi dan pernyataan dan mengembalikan persimpangan geometri diantara mereka.
\n\nIsValidLink to this heading#Tersedia: PostGIS, Oracle, SpatiaLite (LWGEOM)
\nMenerima sebuah bidang geografi atau pernyataan dan percobaan jika nilai berbentuk bagus. Mengembalikan True jika nilainya adalah geometri sah dan False sebaliknya.
LengthLink to this heading#Tersedia: MySQL, Oracle, PostGIS, SpatiaLite
\nAccepts a single geographic linestring or multilinestring field or expression\nand returns its length as a Distance\nmeasure.
On PostGIS and SpatiaLite, when the coordinates are geodetic (angular), you can\nspecify if the calculation should be based on a simple sphere (less\naccurate, less resource-intensive) or on a spheroid (more accurate, more\nresource-intensive) with the spheroid keyword argument.
MySQL tidak mendukung dukungan perhitungan panjang pada geografis SRS.
\n\nMakeValidLink to this heading#Tersedia: PostGIS, SpatiaLite (LWGEOM)
\nAccepts a geographic field or expression and attempts to convert the value into\na valid geometry without losing any of the input vertices. Geometries that are\nalready valid are returned without changes. Simple polygons might become a\nmultipolygon and the result might be of lower dimension than the input.
\n\nMemSizeLink to this heading#Tersedia: PostGIS
\nAccepts a single geographic field or expression and returns the memory size\n(number of bytes) that the geometry field takes.
\nNumGeometriesLink to this heading#Tersedia: MySQL, PostGIS, Oracle, SpatiaLite
\nAccepts a single geographic field or expression and returns the number of\ngeometries if the geometry field is a collection (e.g., a GEOMETRYCOLLECTION\nor MULTI* field). Returns 1 for single geometries.
Pada MySQL, mengembalikan None untuk geometri tunggal.
NumPointsLink to this heading#Tersedia: MySQL, PostGIS, Oracle, SpatiaLite
\nAccepts a single geographic field or expression and returns the number of points\nin the first linestring in the geometry field; otherwise returns None.
PerimeterLink to this heading#Tersedia: PostGIS, Oracle, SpatiaLite
\nAccepts a single geographic field or expression and returns the perimeter of the\ngeometry field as a Distance object.
PointOnSurfaceLink to this heading#Tersedia: PostGIS, Oracle, SpatiaLite
\nAccepts a single geographic field or expression and returns a Point geometry\nguaranteed to lie on the surface of the field; otherwise returns None.
ReverseLink to this heading#Tersedia: PostGIS, Oracle, SpatiaLite
\nAccepts a single geographic field or expression and returns a geometry with\nreversed coordinates.
\nScaleLink to this heading#Tersedia: PostGIS, SpatiaLite
\nAccepts a single geographic field or expression and returns a geometry with\nscaled coordinates by multiplying them with the x, y, and optionally\nz parameters.
SnapToGridLink to this heading#Tersedia: PostGIS, SpatiaLite
\nAccepts a single geographic field or expression and returns a geometry with all\npoints snapped to the given grid. How the geometry is snapped to the grid\ndepends on how many numeric (either float, integer, or long) arguments are\ngiven.
\nJumlah Argumen | \nDeskripsi | \n
|---|---|
1 | \nA single size to snap both the X and Y grids to. | \n
2 | \nX and Y sizes to snap the grid to. | \n
4 | \nX, Y sizes and the corresponding X, Y origins. | \n
SymDifferenceLink to this heading#Tersedia: MySQL (≥ 5.6.1), PostGIS, Oracle, SpatiaLite
\nAccepts two geographic fields or expressions and returns the geometric\nsymmetric difference (union without the intersection) between the given\nparameters.
\n\nTransformLink to this heading#Tersedia: PostGIS, Oracle, SpatiaLite
\nAccepts a geographic field or expression and a SRID integer code, and returns\nthe transformed geometry to the spatial reference system specified by the\nsrid parameter.
TranslateLink to this heading#Tersedia: PostGIS, SpatiaLite
\nAccepts a single geographic field or expression and returns a geometry with\nits coordinates offset by the x, y, and optionally z numeric\nparameters.
UnionLink to this heading#Tersedia: MySQL (≥ 5.6.1), PostGIS, Oracle, SpatiaLite
\nMenerima dua bidang geografi atau pernyataan dan mengembalikan gabungan dari kedua geometri.
\n