ee.Number.toByte

将输入值强制转换为无符号 8 位整数。

用法	返回
Number.toByte()	数字

参数	类型	详细信息
此：input	数字	输入值。

示例

代码编辑器 (JavaScript)

// Cast a number to unsigned 8-bit integer: [0, 255].
var number = ee.Number(100);
print('Number:', number);

var byteNumber = number.toByte();
print('Number cast to byte:', byteNumber);


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

var floatToByte = float.toByte();
print('Floating point value cast to byte:', floatToByte);

// A number greater than byte range max cast to byte becomes byte range max.
var BYTE_MAX = 255;
var outOfRangeHi = ee.Number(BYTE_MAX + 12345);
print('Greater than byte max:', outOfRangeHi);

var outOfRangeHiToByte = outOfRangeHi.toByte();
print('Greater than byte max cast to byte becomes byte max:', outOfRangeHiToByte);

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

var outOfRangeLoToByte = outOfRangeLo.toByte();
print('Less than byte min cast to byte becomes byte min:', outOfRangeLoToByte);

Python 设置

如需了解 Python API 和如何使用 geemap 进行交互式开发，请参阅 Python 环境页面。

import ee
import geemap.core as geemap

Colab (Python)

# Cast a number to unsigned 8-bit integer: [0, 255].
number = ee.Number(100)
display('Number:', number)

byte_number = number.toByte()
display('Number cast to byte:', byte_number)


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

float_to_byte = float_number.toByte()
display('Floating point value cast to byte:', float_to_byte)

# A number greater than byte range max cast to byte becomes byte range max.
BYTE_MAX = 255
out_of_range_hi = ee.Number(BYTE_MAX + 12345)
display('Greater than byte max:', out_of_range_hi)

out_of_range_hi_to_byte = out_of_range_hi.toByte()
display('Greater than byte max cast to byte becomes byte max:',
        out_of_range_hi_to_byte)

# A number greater than byte range min cast to byte becomes byte range min.
BYTE_MIN = 0
out_of_range_lo = ee.Number(BYTE_MIN - 12345)
display('Less than byte min:', out_of_range_lo)

out_of_range_lo_to_byte = out_of_range_lo.toByte()
display('Less than byte min cast to byte becomes byte min:',
        out_of_range_lo_to_byte)