{"title":"Obyek Pengukuran","version":"2.1","locale":"id","docname":"ref/contrib/gis/measure","url":"/id/2.1/ref/contrib/gis/measure/","canonical":"https://djangodocs.dev/id/2.1/ref/contrib/gis/measure/","summary":"Modul django.contrib.gis.measure megandung obyek-obyek yang mengizinkan untuk gambaran nyaman dari jarak dan unit kawasan dari pengukuran. [ 1 ] Khususnya, itu…","html":"

Obyek PengukuranLink to this heading#

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Modul django.contrib.gis.measure megandung obyek-obyek yang mengizinkan untuk gambaran nyaman dari jarak dan unit kawasan dari pengukuran. [1] Khususnya, itu menerapkan dua obyek, Distance dan Area -- kedua dari yang mungkin mengakses melalui nama lain kenyamanan D dan A, masing-masing.

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ContohLink to this heading#

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Obyek-obyek Distance mungkin diinstasiasi menggunakan argumen kata kunci mengindikasikan konteks dari satuan. Di contoh dibawah, dua perbedaan jarak obyek diinstansiasikan dalam satuan kilometer (km) dan mil (mi):

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>>> from django.contrib.gis.measure import D, Distance\n>>> d1 = Distance(km=5)\n>>> print(d1)\n5.0 km\n>>> d2 = D(mi=5) # `D` is an alias for `Distance`\n>>> print(d2)\n5.0 mi\n
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Perubahan adalah mudah, cukup akses atribut satuan dipilih untuk mendapatkan jumlah jarak dirubah:

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>>> print(d1.mi) # Converting 5 kilometers to miles\n3.10685596119\n>>> print(d2.km) # Converting 5 miles to kilometers\n8.04672\n
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Terlebih lagi, tindakan-tindakan aritmatika mungkin dilakukan diantara jarak obyek:

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>>> print(d1 + d2) # Adding 5 miles to 5 kilometers\n13.04672 km\n>>> print(d2 - d1) # Subtracting 5 kilometers from 5 miles\n1.89314403881 mi\n
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Dua obyek Distance digandakan bersama-sama akan menghasilkan sebuah obyek Area, yang menggunakan satuan persegi dari ukuran:

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>>> a = d1 * d2 # Returns an Area object.\n>>> print(a)\n40.2336 sq_km\n
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Untuk menentukan apa singkatan atribut dari satuan adalah, metode kelas unit_attname mungkin digunakan:

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>>> print(Distance.unit_attname('US Survey Foot'))\nsurvey_ft\n>>> print(Distance.unit_attname('centimeter'))\ncm\n
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Satuan DidukungLink to this heading#

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Satuan Atribut

Nama penuh atau nama lain

km

Kilometer

mi

Mil

m

Meter

yd

Yard

ft

Kaki (Internasional)

survey_ft

Kaki Amerika Serikat, penelitian kaki Amerika Serikat

inci

Inci

cm

Sentimeter

mm

Milimeter

um

Mikrometer

british_ft

Kaki Inggris (Sears 1922)

british_yd

Yard Inggris (Sears 1922)

british_chain_sears

British chain (Sears 1922)

indian_yd

Yard India, Yard (India)

sears_yd

Yard (Sears)

clarke_ft

Kaki Clarke

chain

Chain

chain_benoit

Chain (Benoit)

chain_sears

Chain (Sears)

british_chain_benoit

British chain (Benoit 1895 B)

british_chain_sears_truncated

British chain (Sears 1922 truncated)

gold_coast_ft

Gold Coast foot

link

Tautan

link_benoit

Link (Benoit)

link_sears

Link (Sears)

clarke_link

Tautan Clarke

fathom

Fathom

rod

Rod

nm

Nautical Mile

nm_uk

Nautical Mile (UK)

german_m

German legal metre

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API pengukuranLink to this heading#

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DistanceLink to this heading#

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\nclass Distance(**kwargs)Link to this definition#
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Untuk mengawali sebuah jarak obyek, lewatkan kata kunci sesuai pada unit attribute name diinginkan setel dengan nilai diinginkan. Sebagai contoh, berikut membuat sebuah jarak obyek mewakili 5 mil:

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>>> dist = Distance(mi=5)\n
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\n__getattr__(unit_att)Link to this definition#
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Mengembalikan nilai jarak dalam satuan sesuai pada atribut satuan yang diberikan. Sebagai contoh:

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>>> print(dist.km)\n8.04672\n
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\nclassmethod unit_attname(unit_name)Link to this definition#
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Mengembalikan nama atribut satuan jarak untuk nama satuan penuh yang diberikan. Sebagai contoh:

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>>> Distance.unit_attname('Mile')\n'mi'\n
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\nclass DLink to this definition#
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Nama lain untuk kelas Distance.

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AreaLink to this heading#

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\nclass Area(**kwargs)Link to this definition#
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Untuk mengawali sebuah kawasan obyek, lewatkan kata kunci sesuai pada unit attribute name diinginkan setel dengan nilai diinginkan. Sebagai contoh, berikut membuat sebuah kawasan obyek mewakili 5 mil persegi:

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>>> a = Area(sq_mi=5)\n
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\n__getattr__(unit_att)Link to this definition#
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Mengembalikan nilai kawasan di satuan yang berhubungan ke atribut satuan yang diberikan. Sebagai contoh:

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>>> print(a.sq_km)\n12.949940551680001\n
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\nclassmethod unit_attname(unit_name)Link to this definition#
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Mengembalikan nama atribut satuan kawasan untuk nama satuan penuh yang diberikan. Sebagai contoh:

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>>> Area.unit_attname('Kilometer')\n'sq_km'\n
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\nclass ALink to this definition#
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Nama lain untuk kelas Area.

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Catatan kaki

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