ee.Number.toInt8

將輸入值轉換為帶正負號的 8 位元整數。

用量	傳回
Number.toInt8()	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 signed 8-bit integer: [-128, 127].
var number = ee.Number(100);
print('Number:', number);

var int8Number = number.toInt8();
print('Number cast to int8:', int8Number);


/**
 * Casting numbers to int8 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 int8 loses decimal precision.
var float = ee.Number(1.7);
print('Floating point value:', float);

var floatToInt8 = float.toInt8();
print('Floating point value cast to int8:', floatToInt8);

// A number greater than int8 range max cast to int8 becomes int8 range max.
var INT8_MAX = 127;
var outOfRangeHi = ee.Number(INT8_MAX + 12345);
print('Greater than int8 max:', outOfRangeHi);

var outOfRangeHiToInt8 = outOfRangeHi.toInt8();
print('Greater than int8 max cast to int8 becomes int8 max:', outOfRangeHiToInt8);

// A number greater than int8 range min cast to int8 becomes int8 range min.
var INT8_MIN = -128;
var outOfRangeLo = ee.Number(INT8_MIN - 12345);
print('Less than int8 min:', outOfRangeLo);

var outOfRangeLoToInt8 = outOfRangeLo.toInt8();
print('Less than int8 min cast to int8 becomes int8 min:', outOfRangeLoToInt8);

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 signed 8-bit integer: [-128, 127].
number = ee.Number(100)
print('Number:', number.getInfo())

int8_number = number.toInt8()
print('Number cast to int8:', int8_number.getInfo())


"""Casting numbers to int8 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 int8 loses decimal precision.
float_number = ee.Number(1.7)
print('Floating point value:', float_number.getInfo())

float_to_int8 = float_number.toInt8()
print('Floating point value cast to int8:', float_to_int8.getInfo())

# A number greater than int8 range max cast to int8 becomes int8 range max.
INT8_MAX = 127
out_of_range_hi = ee.Number(INT8_MAX + 12345)
print('Greater than int8 max:', out_of_range_hi.getInfo())

out_of_range_hi_to_int8 = out_of_range_hi.toInt8()
print('Greater than int8 max cast to int8 becomes int8 max:',
      out_of_range_hi_to_int8.getInfo())

# A number greater than int8 range min cast to int8 becomes int8 range min.
INT8_MIN = -128
out_of_range_lo = ee.Number(INT8_MIN - 12345)
print('Less than int8 min:', out_of_range_lo.getInfo())

out_of_range_lo_to_int8 = out_of_range_lo.toInt8()
print('Less than int8 min cast to int8 becomes int8 min:',
      out_of_range_lo_to_int8.getInfo())