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Obyek Pengukuran

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.

Contoh

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):

Code
>>> from django.contrib.gis.measure import Distance, D
>>> d1 = Distance(km=5)
>>> print(d1)
5.0 km
>>> d2 = D(mi=5) # `D` is an alias for `Distance`
>>> print(d2)
5.0 mi

Conversions are easy, just access the preferred unit attribute to get a converted distance quantity:

Code
>>> print(d1.mi) # Converting 5 kilometers to miles
3.10685596119
>>> print(d2.km) # Converting 5 miles to kilometers
8.04672

Moreover, arithmetic operations may be performed between the distance objects:

Code
>>> print(d1 + d2) # Adding 5 miles to 5 kilometers
13.04672 km
>>> print(d2 - d1) # Subtracting 5 kilometers from 5 miles
1.89314403881 mi

Two Distance objects multiplied together will yield an Area object, which uses squared units of measure:

Code
>>> a = d1 * d2 # Returns an Area object.
>>> print(a)
40.2336 sq_km

To determine what the attribute abbreviation of a unit is, the unit_attname class method may be used:

Code
>>> print(Distance.unit_attname('US Survey Foot'))
survey_ft
>>> print(Distance.unit_attname('centimeter'))
cm

Satuan Didukung

Satuan Atribut

Nama penuh atau nama lain

km

Kilometer

mi

Mil

m

Meter

yd

Yard

ft

Kaki (Internasional)

survey_ft

U.S. Foot, US survey foot

inci

Inci

cm

Sentimeter

mm

Milimeter

um

Mikrometer

british_ft

British foot (Sears 1922)

british_yd

British yard (Sears 1922)

british_chain_sears

British chain (Sears 1922)

indian_yd

Indian yard, Yard (Indian)

sears_yd

Yard (Sears)

clarke_ft

Clarke's Foot

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

Clarke's link

fathom

Fathom

rod

Rod

nm

Nautical Mile

nm_uk

Nautical Mile (UK)

german_m

German legal metre

API pengukuran

Distance

class Distance(**kwargs)

To initialize a distance object, pass in a keyword corresponding to the desired unit attribute name set with desired value. For example, the following creates a distance object representing 5 miles:

Code
>>> dist = Distance(mi=5)
__getattr__(unit_att)

Returns the distance value in units corresponding to the given unit attribute. For example:

Code
>>> print(dist.km)
8.04672
classmethod unit_attname(unit_name)

Returns the distance unit attribute name for the given full unit name. For example:

Code
>>> Distance.unit_attname('Mile')
'mi'
class D

Nama lain untuk kelas Distance.

Area

class Area(**kwargs)

To initialize an area object, pass in a keyword corresponding to the desired unit attribute name set with desired value. For example, the following creates an area object representing 5 square miles:

Code
>>> a = Area(sq_mi=5)
__getattr__(unit_att)

Mengembalikan nilai kawasan di satuan yang berhubungan ke atribut satuan yang diberikan. Sebagai contoh:

Code
>>> print(a.sq_km)
12.949940551680001
classmethod unit_attname(unit_name)

Mengembalikan nama atribut satuan kawasan untuk nama satuan penuh yang diberikan. Sebagai contoh:

Code
>>> Area.unit_attname('Kilometer')
'sq_km'
class A

Nama lain untuk kelas Area.

Catatan kaki

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