ee.Number.uint16

將輸入值轉換為無正負號的 16 位元整數。

用量	傳回
Number.uint16()	數字

引數	類型	詳細資料
這個：input	數字	輸入值。

範例

程式碼編輯器 (JavaScript)

// Cast a number to unsigned 16-bit integer: [0, 65535].
var number = ee.Number(100);
print('Number:', number);

var uint16Number = number.uint16();
print('Number cast to uint16:', uint16Number);


/**
 * Casting numbers to uint16 that are outside of its range and precision can
 * modify the resulting value, note the behavior of the following scenarios.
 */

// A floating point number cast to uint16 loses decimal precision.
var float = ee.Number(1.7);
print('Floating point value:', float);

var floatToUint16 = float.uint16();
print('Floating point value cast to uint16:', floatToUint16);

// A number greater than uint16 range max cast to uint16 becomes uint16 range max.
var UINT16_MAX = 65535;
var outOfRangeHi = ee.Number(UINT16_MAX + 12345);
print('Greater than uint16 max:', outOfRangeHi);

var outOfRangeHiToUint16 = outOfRangeHi.uint16();
print('Greater than uint16 max cast to uint16 becomes uint16 max:', outOfRangeHiToUint16);

// A number greater than uint16 range min cast to uint16 becomes uint16 range min.
var UINT16_MIN = 0;
var outOfRangeLo = ee.Number(UINT16_MIN - 12345);
print('Less than uint16 min:', outOfRangeLo);

var outOfRangeLoToUint16 = outOfRangeLo.uint16();
print('Less than uint16 min cast to uint16 becomes uint16 min:', outOfRangeLoToUint16);

Python 設定

請參閱 Python 環境頁面，瞭解 Python API 和如何使用 geemap 進行互動式開發。

import ee
import geemap.core as geemap

Colab (Python)

# Cast a number to unsigned 16-bit integer: [0, 65535].
number = ee.Number(100)
print('Number:', number.getInfo())

uint16_number = number.uint16()
print('Number cast to uint16:', uint16_number.getInfo())


"""Casting numbers to uint16 that are outside of its range and precision can
modify the resulting value, note the behavior of the following scenarios.
"""

# A floating point number cast to uint16 loses decimal precision.
float_number = ee.Number(1.7)
print('Floating point value:', float_number.getInfo())

float_number_to_uint16 = float_number.uint16()
print('Floating point value cast to uint16:', float_number_to_uint16.getInfo())

# A number greater than uint16 range max cast to uint16
# becomes uint16 range max.
UINT16_MAX = 65535
out_of_range_hi = ee.Number(UINT16_MAX + 12345)
print('Greater than uint16 max:', out_of_range_hi.getInfo())

out_of_range_hi_to_uint16 = out_of_range_hi.uint16()
print('Greater than uint16 max cast to uint16 becomes uint16 max:',
      out_of_range_hi_to_uint16.getInfo())

# A number greater than uint16 range min cast to uint16
# becomes uint16 range min.
UINT16_MIN = 0
out_of_range_lo = ee.Number(UINT16_MIN - 12345)
print('Less than uint16 min:', out_of_range_lo.getInfo())

out_of_range_lo_to_uint16 = out_of_range_lo.uint16()
print('Less than uint16 min cast to uint16 becomes uint16 min:',
      out_of_range_lo_to_uint16.getInfo())