ee.Number.toInt8

入力値を符号付き 8 ビット整数にキャストします。

用途	戻り値
Number.toInt8()	数値

引数	タイプ	詳細
これ: input	数値	入力値。

例

コードエディタ（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 の設定

Python API とインタラクティブな開発での geemap の使用については、 Python 環境のページをご覧ください。

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())