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Feidhmeanna Bunachar SonraíLink to this heading#

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Ligeann na feidhmeanna doiciméadaithe ar an leathanach seo d'úsáideoirí rochtain a fháil ar fheidhmeanna bunachar sonraí geografacha le húsáid in anótaí, comhiomlánaithe nó scagairí i Django.

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Sampla:

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Python console
>>> from django.contrib.gis.db.models.functions import Length\n>>> Track.objects.annotate(length=Length("line")).filter(length__gt=100)\n
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Ní thacaíonn gach cúltaca le gach feidhm, mar sin déan tagairt do dhoiciméadú gach feidhme chun a fháil amach an dtacaíonn do chúlcheann bunachar sonraí leis an bhfeidhm is mian leat a úsáid. Má ghlaonn tú feidhm gheografach ar chúltaca nach dtacaíonn leis, gheobhaidh tú eisceacht NotImplementederror.

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MeasurementsLink to this heading#

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LimistéarLink to this heading#

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\nclass Area(expression, **extra)Link to this definition#
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< https://dev.mysql.com/doc/refman/en/gis-polygon-property-functions.html#function_st-area> < https://postgis.net/docs/ST_Area.html>*Infhaighteacht*: MariaDB, MySQL, Oracle, `PostGIS`__, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus cuireann sé limistéar an réimse ar ais mar bheart: ~django.contrib.gis.Measure.Area.

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Ní thacaíonn MySQL agus SpatialITE gan LWGEOM/RTTOPO le ríomhanna limistéar ar SRSEanna geografacha.

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``Fad ``Link to this heading#

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\nclass Distance(expr1, expr2, spheroid=None, **extra)Link to this definition#
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< https://dev.mysql.com/doc/refman/en/spatial-relation-functions-object-shapes.html#function_st-distance> < https://postgis.net/docs/ST_Distance.html>* Infhaighteacht*: MariaDB, `MySQL`__, `PostGIS`__, Oracle, Spatialite

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Glacann sé le dhá réimse nó abairt gheografach agus filleann sé an fad eatarthu, mar a:class: ~django.contrib.gis.Measure.distance réad. Ar MySQL, cuirtear luach snámh amh ar ais nuair a bhíonn na comhordanáidí geodeiteach.

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< https://postgis.net/docs/ST_DistanceSphere.html>Ar chúltaca a thacaíonn le ríomh achair ar chomhordanáidí geodéiseacha, roghnaítear an fheidhm cúltaca ceart go huathoibríoch ag brath ar luach SRID na ngeoiméadraí (m.sh. `ST_distanceSPHERE`__ ar PostGIS).

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Nuair a ríomhtar achair le comhordanáidí geodéiseacha (uilleacha), mar atá leis an réamhshocraithe WGS84 (4326) SRID, is féidir leat an argóint eochairfhocal spheroid a shocrú chun cinneadh a dhéanamh an chóir an ríomh a bheith bunaithe ar réimse simplí (níos cruinne, níos dian-acmhainní) nó ar spheroid (níos cruinne, níos déine acmhainní).

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Sa sampla seo a leanas, ríomhtar an fad ó chathair Hobart go gach ceann eile: ~django.contrib.gis.db.models.pointfield sa tacar ceisteanna Austráliacity:

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Python console
>>> 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)\n...\nWollongong 990071.220408 m\nShellharbour 972804.613941 m\nThirroul 1002334.36351 m\n...\n
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Fad geoiméadraitheLink to this heading#

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\nclass GeometryDistance(expr1, expr2, **extra)Link to this definition#
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< https://postgis.net/docs/geometry_distance_knn.html>*Infhaighteacht*: `PostGis`__

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Glacann sé le dhá réimse nó abairt gheografach agus filleann sé an fad eatarthu. Nuair a úsáidtear é i gclásal an:meth: ~django.db.models.query.queryset.order_by, soláthraíonn sé tacair torthaí is gaire don chomharsa le cúnamh innéacs.

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``Fad ``Link to this heading#

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\nclass Length(expression, spheroid=True, **extra)Link to this definition#
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< https://dev.mysql.com/doc/refman/en/gis-linestring-property-functions.html#function_st-length> < https://postgis.net/docs/ST_Length.html>*Infhaighteacht*: MariaDB, `MySQL`__, Oracle, `PostGIS`__, Spatialite

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Glacann sé le réimse nó léiriú líne geografach amháin nó illíne agus filleann sé a fhad mar a: aicme: ~django.contrib.gis.measur.distance beart.

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Ar PostGIS agus Spatialite, nuair a bhíonn na comhordanáidí geodeiteach (uilleach), is féidir leat a shonrú an chóir go mbeadh an ríomh bunaithe ar réimse simplí (chomh cruinn, chomh dian ar acmhainní) nó ar spheroid (níos cruinne, níos déine acmhainní) leis an argóint eochairfhocal spheroid.

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Ní thacaíonn MySQL le ríomhanna fad ar SRSEanna geografacha.

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``Periméadar ``Link to this heading#

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\nclass Perimeter(expression, **extra)Link to this definition#
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< https://postgis.net/docs/ST_Perimeter.html>*Infhaighteacht*: `PostGIS`__, Oracle, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus cuireann sé imlíne an réimse geoimnéadais ar ais mar a:class: ~django.contrib.gis.Measure.distance réad.

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CaidrimhLink to this heading#

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AzimuthLink to this heading#

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\nclass Azimuth(point_a, point_b, **extra)Link to this definition#
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< https://postgis.net/docs/ST_Azimuth.html>* Infhaighteacht*: `PostGIS`__, Spatialite (LWGEOM/RTTOPO)

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Filleann sé an azimuth i radáin den deighleog atá sainmhínithe ag na geoiméadrachtaí pointe ar leith, nó None ``má tá an dá phointe ag teacht le chéile. Is uillinn é an azimuth a dtagraítear ó thuaidh agus tá sé dearfach deaclaíoch: thuaidh = ``0; thoir = π/2`; theas = π; thiar = 3π/2.

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Ciorcal teorannaitheachLink to this heading#

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\nclass BoundingCircle(expression, num_seg=48, **extra)Link to this definition#
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< https://postgis.net/docs/ST_MinimumBoundingCircle.html> < https://docs.oracle.com/en/database/oracle/oracle-database/21/spatl/ SDO_GEOM-reference.html #GUID -82A61626-BB64-4793-B53D-A0DBEC91831A>*Infhaighteacht*: `PostGis`__, Oracle, Spatialite 5.1+

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Glacann sé le réimse nó léiriú geografach amháin agus filleann sé an polagún ciorcal is lú ar féidir leis an geoiméadacht a bheith ina iomlán.

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Ní úsáidtear an paraiméadar num_seg ach ar PostGIS.

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CentroidLink to this heading#

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\nclass Centroid(expression, **extra)Link to this definition#
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< https://dev.mysql.com/doc/refman/en/gis-polygon-property-functions.html#function_st-centroid> < https://postgis.net/docs/ST_Centroid.html>* Infhaighteacht*: MariaDB, `MySQL`__, `PostGIS`__, Oracle, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus filleann sé luach centroid an ghéiméadrachta.

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ClosestpointLink to this heading#

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\nclass ClosestPoint(expr1, expr2, **extra)Link to this definition#
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< https://postgis.net/docs/ST_ClosestPoint.html>*Infhaighteacht*: `PostGis`__, Spatialite

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Glacann sé le dhá réimse nó abairt gheografacha agus filleann sé an pointe déthoiseach ar ghéimseadra A atá is gaire do ghéimse

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`ImbléadLink to this heading#

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\nclass Envelope(expression, **extra)Link to this definition#
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< https://dev.mysql.com/doc/refman/en/gis-general-property-functions.html#function_st-envelope> < https://docs.oracle.com/en/database/oracle/oracle-database/21/spatl/ spatial-operators-reference.html #GUID -ACED800F-3435-44AA-9606-D40934A23ED0> < https://postgis.net/docs/ST_Envelope.html>*Infhaighteacht*: MariaDB, `MySQL`__, `Oracle`__, `PostGis`__, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus filleann sé an geoiméadra a léiríonn bosca teorainneacha an geoiméadair.

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LinelocatepointLink to this heading#

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\nclass LineLocatePoint(linestring, point, **extra)Link to this definition#
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< https://postgis.net/docs/ST_LineLocatePoint.html>*Infhaighteacht*: `PostGis`__, Spatialite

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Tugann sé snámhphointe idir 0 agus 1 a léiríonn suíomh an phointe is gaire ar linestring` don point` a thugtar, mar chodán den fad líne 2D.

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PointonSurfaceLink to this heading#

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\nclass PointOnSurface(expression, **extra)Link to this definition#
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< https://postgis.net/docs/ST_PointOnSurface.html>*Infhaighteacht*: `PostGIS`__, MariaDB, Oracle, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus filleann sé geoiméadacht Point ráthaithe go luíonn sé ar dhromchla an réimse; ar shlí eile filleann sé None.

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OibríochtaíLink to this heading#

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``Difríocht ``Link to this heading#

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\nclass Difference(expr1, expr2, **extra)Link to this definition#
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< https://dev.mysql.com/doc/refman/en/spatial-operator-functions.html#function_st-difference> < https://postgis.net/docs/ST_Difference.html>* Infhaighteacht*: MariaDB, `MySQL`__, `PostGIS`__, Oracle, Spatialite

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Glacann sé le dhá réimse nó abairt gheografacha agus filleann sé an difríocht geoiméadrach ar ais, is é sin an chuid de ghéimseata A nach ndéanann trasnán le céimse

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``Idirdhearnadh ``Link to this heading#

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\nclass Intersection(expr1, expr2, **extra)Link to this definition#
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< https://dev.mysql.com/doc/refman/en/spatial-operator-functions.html#function_st-intersection> < https://postgis.net/docs/ST_Intersection.html>* Infhaighteacht*: MariaDB, `MySQL`__, `PostGIS`__, Oracle, Spatialite

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Glacann sé le dhá réimse nó abairt gheografach agus cuireann sé an trasna geoiméadrach eatarthu

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Difríocht chomhshaLink to this heading#

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\nclass SymDifference(expr1, expr2, **extra)Link to this definition#
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< https://dev.mysql.com/doc/refman/en/spatial-operator-functions.html#function_st-symdifference> < https://postgis.net/docs/ST_SymDifference.html>* Infhaighteacht*: MariaDB, `MySQL`__, `PostGIS`__, Oracle, Spatialite

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Glacann sé le dhá réimse nó abairt gheografacha agus filleann sé an difríocht shioméadrach geoiméadrach (aontas gan an trasna) idir na paraiméadair

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AontasLink to this heading#

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\nclass Union(expr1, expr2, **extra)Link to this definition#
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< https://dev.mysql.com/doc/refman/en/spatial-operator-functions.html#function_st-union> < https://postgis.net/docs/ST_Union.html>* Infhaighteacht*: MariaDB, `MySQL`__, `PostGIS`__, Oracle, Spatialite

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Glacann sé le dhá réimse nó abairt gheografach agus cuireann sé aontas an dá ghéiméadair ar ais.

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EagarthóiríLink to this heading#

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ForcePolygOncwLink to this heading#

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\nclass ForcePolygonCW(expression, **extra)Link to this definition#
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< https://postgis.net/docs/ST_ForcePolygonCW.html>*Infhaighteacht*: `PostGis`__, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus filleann sé leagan modhnaithe den pholagón/ilpholygón ina bhfuil na fáinní seachtracha go léir dírithe ar an gcéal agus go bhfuil gach fáinní istigh dírithe i gcoinne. Cuirtear geoiméadraí neamholgánacha ar ais gan athrú.

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MakevalidLink to this heading#

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\nclass MakeValid(expr)Link to this definition#
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< https://postgis.net/docs/ST_MakeValid.html>* Infhaighteacht*: `PostGIS`__, Spatialite (LWGEOM/RTTOPO)

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Glacann sé le réimse nó léiriú geografach agus déanann sé iarracht an luach a thiontú ina geoiméadracht bailí gan aon cheann de na beartacha ionchuir a chail Cuirtear geoiméadraí atá bailí cheana féin ar ais gan athruithe. D'fhéadfadh go mbeadh polagóin shimplí ina ilpholygón agus d'fhéadfadh gné níos ísle a bheith ar an toradh ná an t-ionchur.

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`Ag siomLink to this heading#

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\nclass Reverse(expression, **extra)Link to this definition#
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< https://postgis.net/docs/ST_Reverse.html>*Infhaighteacht*: `PostGIS`__, Oracle, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus filleann sé céimseata le comhordanáidí aisiom

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``Scála ``Link to this heading#

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\nclass Scale(expression, x, y, z=0.0, **extra)Link to this definition#
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< https://postgis.net/docs/ST_Scale.html>*Infhaighteacht*: `PostGis`__, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus filleann sé céiméadra le comhordanáidí scáilte tríd iad a iolrú leis na paraiméadair x, y`, agus `z ``roghnach.

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``SnaptoGrid ``Link to this heading#

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\nclass SnapToGrid(expression, *args, **extra)Link to this definition#
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< https://postgis.net/docs/ST_SnapToGrid.html>*Infhaighteacht*: `PostGis`__, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus filleann sé céiméadracht le gach pointe a ghearradh chuig an eangach ar leith. Braitheann an chaoi a ngearrtar an geoiméadracht chuig an eangach ar cé mhéad argóint uimhriúla (snámhphointe, sláimhir nó fada) a thugtar.

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Líon na n-Argóintí

Cur síos

1

Méid amháin chun na greille X agus Y a ghabháil leo.

2

Méideanna X agus Y chun an greille a ghabháil chuig.

4

Méideanna X, Y agus an bhunús X, Y comhfhreagrach.

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TransformLink to this heading#

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\nclass Transform(expression, srid, **extra)Link to this definition#
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< https://postgis.net/docs/ST_Transform.html>*Infhaighteacht*: `PostGIS`__, Oracle, Spatialite

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Glacann sé le réimse nó léiriú geografach agus cód sláimhir SRID, agus filleann sé an geoiméadra claochlaithe ar ais chuig an gcóras tagartha spásúil a shonraítear leis an bparaiméadar ``srid`.

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AistriúchLink to this heading#

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\nclass Translate(expression, x, y, z=0.0, **extra)Link to this definition#
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< https://postgis.net/docs/ST_Translate.html>*Infhaighteacht*: `PostGis`__, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus filleann sé céiméadracht lena chomhordanáidí a fhritháireamh leis na paraiméadair uimhriúla x, y`, agus `z ``roghnach.

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Formáid ionchuirLink to this heading#

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FromWKBLink to this heading#

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\nclass FromWKB(expression, srid=0, **extra)Link to this definition#
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< https://dev.mysql.com/doc/refman/en/gis-wkb-functions.html#function_st-geomfromwkb> < https://postgis.net/docs/ST_GeomFromWKB.html>*Infhaighteacht*: MariaDB, `MySQL`__, Oracle, `PostGIS`__, Spatialite

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Cruthaíonn sé geoiméadracht ó ionadaíocht dénártha aitheanta (WKB) `_. Ligeann an argóint roghnach ``srid` SRID an geoiméadracht mar thoradh air a shonrú. Déantar neamhaird ar srid ar Oracle.

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FromWKTLink to this heading#

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\nclass FromWKT(expression, srid=0, **extra)Link to this definition#
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< https://dev.mysql.com/doc/refman/en/gis-wkt-functions.html#function_st-geomfromtext> < https://postgis.net/docs/ST_GeomFromText.html>*Infhaighteacht*: MariaDB, `MySQL`__, Oracle, `PostGIS`__, Spatialite

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Cruthaíonn sé geoiméadracht ó ionadaíocht téacs aitheanta (WKT) `_. Ligeann an argóint roghnach ``srid` SRID an geoiméadracht mar thoradh air a shonrú. Déantar neamhaird ar srid ar Oracle.

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Formáid aschuirLink to this heading#

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AsgeojsonLink to this heading#

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< https://dev.mysql.com/doc/refman/en/spatial-geojson-functions.html#function_st-asgeojson> < https://postgis.net/docs/ST_AsGeoJSON.html>*Infhaighteacht*: MariaDB, `MySQL`__, Oracle, `PostGIS`__, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus cuireann sé léiriú GeoJson ar an geoiméadracht < https://geojson.org/> ar ais. Tabhair faoi deara nach struchtúr iomlán GeoJSON é an toradh ach ach príomhábhar “geoiméadracht” de struchtúr GeoJSON amháin. Féach freis:doc: /ref/contrib/gis/serializers.

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Sampla:

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Python console
>>> City.objects.annotate(json=AsGeoJSON("point")).get(name="Chicago").json\n{"type":"Point","coordinates":[-87.65018,41.85039]}\n
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Argóint Eochairfho

Cur síos

bbox

Socraigh é seo go True más mian leat go gcuirfí an bosca teorainneacha san áireamh sa GeoJSON ar ais. Neamhaird a dhéanamh ar Oracle.

crs

Socraigh é seo go True más mian leat go gcuirfí an córas tagartha comhordaithe san áireamh sa GeoJSON ar ais. Neamhaird a dhéanamh ar MySQL agus Oracle.

`cruinne

Is féidir é a úsáid chun líon na ndigití suntasacha a shonrú do na comhordanáidí san ionadaíocht GeoJSON - is é 8 an luach réamhshocraithe. Neamhaird a dhéanamh ar Oracle.

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ASGMLLink to this heading#

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\nclass AsGML(expression, version=2, precision=8, **extra)Link to this definition#
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< https://postgis.net/docs/ST_AsGML.html>*Infhaighteacht*: Oracle, `PostGis`__, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus filleann sé léiriú `Teanga Marcála Geografach (GML) `__ ar an geoiméadracht.

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Sampla:

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Python console
>>> 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>\n
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Argóint Eochairfho

Cur síos

`cruinne

Sonraíonn sé líon na ndigití suntasacha do na comhordanáidí san ionadaíocht GML - is é 8 an luach réamhshocraithe. Neamhaird a dhéanamh ar Oracle.

leagan

Sonraíonn sé an leagan GML le húsáid: 2 (réamhshocraithe) nó 3.

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AskmlLink to this heading#

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\nclass AsKML(expression, precision=8, **extra)Link to this definition#
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< https://postgis.net/docs/ST_AsKML.html>*Infhaighteacht*: `PostGis`__, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus filleann sé léiriú `Teanga Marcála Eochairpholl (KML) `__ ar an geoiméadracht.

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Sampla:

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Python console
>>> 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>\n
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Argóint Eochairfho

Cur síos

`cruinne

Is féidir an eochairfhocal seo a úsáid chun líon na ndigití suntasacha do na comhordanáidí san ionadaíocht KML a shonrú - is é 8 an luach réamhshocraithe.

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AssvgLink to this heading#

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\nclass AsSVG(expression, relative=False, precision=8, **extra)Link to this definition#
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< https://postgis.net/docs/ST_AsSVG.html>*Infhaighteacht*: `PostGis`__, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus filleann sé léiriú `Grafaicí Vector Inscálaithe (SVG) `__ ar an geoiméadracht.

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Argóint Eochairfho

Cur síos

``gaolmhar ``

Má tá sé socraithe go “True”, cuirfear na sonraí cosáin i bhfeidhm i dtéarmaí gluaiseachtaí coibhneasta. Réamhshocraithe go False, rud a chiallaíonn go n-úsáidtear gluaiseachtaí iomlána ina ionad.

`cruinne

Is féidir an eochairfhocal seo a úsáid chun líon na ndigití suntasacha do na comhordanáidí san ionadaíocht SVG a shonrú - is é 8 an luach réamhshocraithe.

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ASWKBLink to this heading#

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\nclass AsWKB(expression, **extra)Link to this definition#
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< https://dev.mysql.com/doc/refman/en/gis-format-conversion-functions.html#function_st-asbinary> < https://postgis.net/docs/ST_AsBinary.html>*Infhaighteacht*: MariaDB, `MySQL`__, Oracle, `PostGIS`__, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus filleann sé léiriú `dénártha aitheanta (WKB) `_ ar an geoiméadracht.

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Sampla:

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Python console
>>> bytes(City.objects.annotate(wkb=AsWKB("point")).get(name="Chelyabinsk").wkb)\nb'\\x01\\x01\\x00\\x00\\x00]3\\xf9f\\x9b\\x91K@\\x00X\\x1d9\\xd2\\xb9N@'\n
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ASWKTLink to this heading#

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\nclass AsWKT(expression, **extra)Link to this definition#
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< https://dev.mysql.com/doc/refman/en/gis-format-conversion-functions.html#function_st-astext> < https://postgis.net/docs/ST_AsText.html>*Infhaighteacht*: MariaDB, `MySQL`__, Oracle, `PostGIS`__, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus cuireann sé léiriú `téacs aitheanta (WKT) `_ ar an geoiméadracht ar ais.

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Sampla:

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Python console
>>> City.objects.annotate(wkt=AsWKT("point")).get(name="Chelyabinsk").wkt\n'POINT (55.137555 61.451728)'\n
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GeohashLink to this heading#

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\nclass GeoHash(expression, precision=None, **extra)Link to this definition#
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< https://dev.mysql.com/doc/refman/en/spatial-geohash-functions.html#function_st-geohash> < https://postgis.net/docs/ST_GeoHash.html>* Infhaighteacht*: `MySQL`__, `PostGIS`__, Spatialite (LWGEOM/RTTOPO)

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Glacann sé le réimse nó léiriú geografach amháin agus filleann sé léiriú `Geohash`__ ar an geoiméadracht.

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Rialaíonn an argóint eochairfhocal cruinne líon na gcarachtar sa toradh.

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IlghnéitheachLink to this heading#

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IsemptyLink to this heading#

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\nclass IsEmpty(expr)Link to this definition#
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< https://postgis.net/docs/ST_IsEmpty.html>*Infhaighteacht*: `PostGis`__

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Glacann sé le réimse nó léiriú geografach agus déanann sé tástáil más geoiméadra folamh é an luach. Tugann sé ar ais True má tá a luach folamh agus False ar shlí eile.

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IsvalidLink to this heading#

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\nclass IsValid(expr)Link to this definition#
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< https://dev.mysql.com/doc/refman/en/spatial-convenience-functions.html#function_st-isvalid> < https://postgis.net/docs/ST_IsValid.html>*Infhaighteacht*: `MySQL`__, `PostGis`__, Oracle, Spatialite

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Glacann sé le réimse nó léiriú geografach agus déanann sé tástáil má tá an luach cruthaithe go maith. Tugann sé ar ais True más geoiméadracht bailí é a luach agus False a shlí eile.

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``Memsize ``Link to this heading#

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\nclass MemSize(expression, **extra)Link to this definition#
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< https://postgis.net/docs/ST_MemSize.html>*Infhaighteacht*: `PostGis`__

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Glacann sé le réimse nó léiriú geografach amháin agus filleann sé an méid cuimhne (líon na mbetaí) a thógann an réimse geoiméadrach.

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Uimhreacha GeometraiLink to this heading#

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\nclass NumGeometries(expression, **extra)Link to this definition#
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< https://dev.mysql.com/doc/refman/en/gis-geometrycollection-property-functions.html#function_st-numgeometries> < https://postgis.net/docs/ST_NumGeometries.html>* Infhaighteacht*: MariaDB, `MySQL`__, `PostGIS`__, Oracle, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus filleann sé líon na ngeoiméadraí más bailiúchán é an réimse geoiméadrach (m.sh., réimse GEOMETRYCOLLECTION nó MULTI*). Tuairisceáin 1 le haghaidh geoiméadraí aonair.

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Ar MySQL, filleann ``None ``le haghaidh geoiméadraí aonair.

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NumpointsLink to this heading#

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\nclass NumPoints(expression, **extra)Link to this definition#
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< https://dev.mysql.com/doc/refman/en/gis-linestring-property-functions.html#function_st-numpoints> < https://postgis.net/docs/ST_NPoints.html>* Infhaighteacht*: MariaDB, `MySQL`__, `PostGIS`__, Oracle, Spatialite

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Glacann sé le réimse nó léiriú geografach amháin agus filleann sé líon na bpointí i gcéiméadra ar ais.

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Ar MySQL, filleann None d'aon ghéimseadracht neamh-LíneString`.

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