ee.Number.expression

Sayısal bir ifadeyi hesaplar.

Kullanım	İadeler
ee.Number.expression(expression, vars)	Sayı

Bağımsız Değişken	Tür	Ayrıntılar
expression	Dize	Değerlendirilecek matematiksel ifade dizesi. İfadeler, standart aritmetik, Boole ve ilişkisel operatörlerin yanı sıra Number'daki tüm işlevleri, "vars" sözlüğünden alt öğeleri çıkarmak için kullanılan "." operatörünü ve matematiksel sabitler Math.PI ve Math.E'yi de destekler.
vars	Sözlük, varsayılan: null	İfadede kullanılabilecek adlandırılmış değerlerin sözlüğü.

Örnekler

Kod Düzenleyici (JavaScript)

// A dictionary of variables to use in expression.
var variables = {x: 5, y: 10};

// Arithmetic operators.
print('x + y',
      ee.Number.expression('x + y', variables));
print('x - y',
      ee.Number.expression('x - y', variables));
print('x * y',
      ee.Number.expression('x * y', variables));
print('x / y',
      ee.Number.expression('x / y', variables));
print('x ** y',
      ee.Number.expression('x ** y', variables));
print('x % y',
      ee.Number.expression('x % y', variables));

// Logical operators.
print('x || y',
      ee.Number.expression('x || y', variables));
print('x && y',
      ee.Number.expression('x && y', variables));
print('!(x)',
      ee.Number.expression('!(x)', variables));

// Relational operators.
print('x > y',
      ee.Number.expression('x > y', variables));
print('x >= y',
      ee.Number.expression('x >= y', variables));
print('x < y',
      ee.Number.expression('x < y', variables));
print('x <= y',
      ee.Number.expression('x <= y', variables));
print('x == y',
      ee.Number.expression('x == y', variables));
print('x != y',
      ee.Number.expression('x != y', variables));

// Conditional (ternary) operator.
print('(x < y) ? 100 : 1000)',
      ee.Number.expression('(x < y) ? 100 : 1000', variables));

// Constants in the expression.
print('100 * (x + y)',
      ee.Number.expression('100 * (x + y)', variables));

// JavaScript Math constants.
print('Math.PI',
      ee.Number.expression('Math.PI', null));
print('Math.E',
      ee.Number.expression('Math.E', null));

// Dot notation to call on child elements.
print('Use dot notation to call on child elements',
      ee.Number.expression('vals.x * vals.y', {vals: variables}));

// ee.Number functions.
print('Use ee.Number add: add(x, y)',
      ee.Number.expression('add(x, y)', variables));
print('Use ee.Number add and subtract: subtract(add(x, y), 5)',
      ee.Number.expression('subtract(add(x, y), 5)', variables));

Python kurulumu

Python API'si ve etkileşimli geliştirme için geemap kullanımı hakkında bilgi edinmek üzere Python Ortamı sayfasına bakın.

import ee
import geemap.core as geemap

Colab (Python)

# A dictionary of variables to use in expression.
variables = {'x': 5, 'y': 10}

# Arithmetic operators.
display('x + y:',
        ee.Number.expression('x + y', variables))
display('x - y:',
        ee.Number.expression('x - y', variables))
display('x * y:',
        ee.Number.expression('x * y', variables))
display('x / y:',
        ee.Number.expression('x / y', variables))
display('x ** y:',
        ee.Number.expression('x ** y', variables))
display('x % y:',
        ee.Number.expression('x % y', variables))

# Logical operators.
display('x || y:',
        ee.Number.expression('x || y', variables))
display('x && y:',
        ee.Number.expression('x && y', variables))
display('!(x):',
        ee.Number.expression('!(x)', variables))

# Relational operators.
display('x > y:',
        ee.Number.expression('x > y', variables))
display('x >= y:',
        ee.Number.expression('x >= y', variables))
display('x < y:',
        ee.Number.expression('x < y', variables))
display('x <= y:',
        ee.Number.expression('x <= y', variables))
display('x == y:',
        ee.Number.expression('x == y', variables))
display('x != y:',
        ee.Number.expression('x != y', variables))

# Conditional JavaScript (ternary) operator.
display('(x < y) ? 100 : 1000):',
        ee.Number.expression('(x < y) ? 100 : 1000', variables))

# Constants in the expression.
display('100 * (x + y):',
        ee.Number.expression('100 * (x + y)', variables))

# JavaScript Math constants.
display('Math.PI:',
        ee.Number.expression('Math.PI', None))
display('Math.E:',
        ee.Number.expression('Math.E', None))

# Dot notation to call on child elements.
display('Use dot notation to call on child elements:',
        ee.Number.expression('vals.x * vals.y', {'vals': variables}))

# ee.Number functions.
display('Use ee.Number add. add(x, y):',
        ee.Number.expression('add(x, y)', variables))
display('Use ee.Number add and subtract. subtract(add(x, y), 5):',
        ee.Number.expression('subtract(add(x, y), 5)', variables))