Landsat 8 Landsat8 Collection2表面反射率数据

此星光明

发布于 2024-05-24 09:19:11

790

发布于 2024-05-24 09:19:11

文章被收录于专栏：GEE数据专栏，GEE学习专栏，GEE错误集等专栏GEE数据专栏，GEE学习专栏，GEE错误集等专栏

简介

Landsat8 Collection2表面反射率数据，属Collection2二级数据产品，分辨率为30米，基于陆地表面反射率代码(LaSRC)(版本1.5.0)生成，该算法利用沿海气溶胶波段进行气溶胶反演测试，还利用了MODIS的辅助气候数据和独特的辐射传输模型。此外，LaSRC算法将观测天顶角硬编码为“0”，太阳天顶角和观测天顶角作为大气校正的一部分参与计算。

Landsat 8 Collection 2 Surface Reflectance Data 是一种由美国地质调查局（USGS）提供的遥感数据产品，用于监测和研究地球表面的反射率。该数据集基于Landsat 8 OLI（Operational Land Imager）传感器收集的遥感图像，并经过大量的预处理和校正，以提供具有较高质量和一致性的表面反射率数据。

Landsat 8 Collection 2 Surface Reflectance Data 提供了对地球表面的多波段、多时期遥感影像进行处理和校正后的结果。这些影像包括可见光、近红外、红外和短波红外波段，可以用于监测陆地、水域和大气的变化、研究植被生长和覆盖、土地利用和土地覆盖分类等应用。

Landsat 8 Collection 2 Surface Reflectance Data 还提供了一些附加的衍生产品，如植被指数（如NDVI和EVI）、地表温度数据等。这些衍生产品可以用于进一步的地表研究和分析。

Landsat 8 Collection 2 Surface Reflectance Data 可以免费获取，并且可以通过USGS的EarthExplorer网站或其他相关的数据下载平台获得。数据以GeoTIFF格式存储，并可以与地理信息系统（GIS）软件进行集成和分析。

数据集ID:

LC08/02/SR

时间范围: 2013年03月-现在

范围: 全国

来源: USGS

复制代码段:

var images = pie.ImageCollection("LC08/02/SR")

波段

名称	单位	类型	值域范围	填充值	乘法比例因子	加性比例因子	描述信息
B1	Reflectance	uint16	7273~43636	0	0.0000275	-0.2	Band 1 SR
B2	Reflectance	uint16	7273~43636	0	0.0000275	-0.2	Band 2 SR
B3	Reflectance	uint16	7273~43636	0	0.0000275	-0.2	Band 3 SR
B4	Reflectance	uint16	7273~43636	0	0.0000275	-0.2	Band 4 SR
B5	Reflectance	uint16	7273~43636	0	0.0000275	-0.2	Band 5 SR
B6	Reflectance	uint16	1~65535	0	0.0000275	-0.2	Band 6 SR
B7	Reflectance	uint16	7273~43636	0	0.0000275	-0.2	Band 7 SR
B10	Kelvin	uint16	1~65535	0	0.00341802	149	Band 10 ST
QA_PIXEL	Bit Index	uint16	21824~65534	1	-	-	Level 2 Pixel Quality Band
SR_QA_AEROSOL	Bit Index	uint8	0~255	1	-	-	Aerosol QA
QA_RADSAT	Bit Index	uint16	0~3829	32768	-	-	Radiometric Saturation QA
ST_QA	Kelvin	int16	0~32767	-9999	0.01	-	Surface Temperature Uncertainty
ST_TRAN	W/(m 2.sr.μm)/ DN	int16	0~22000	-9999	0.001	-	Thermal Band in Radiance
ST_URAD	W/(m 2.sr.μm)/ DN	int16	0~28000	-9999	0.001	-	Upwelled Radiance
ST_DRAD	W/(m 2.sr.μm)/ DN	int16	0~28000	-9999	0.001	-	Downwelled Radiance
ST_ATRAD	Unitless	int16	0~10000	-9999	0.0001	-	Atmospheric Transmittance
ST_EMIS	Unitless	int16	0~10000	-9999	0.0001	-	Emissivity estimated from ASTER GED
ST_EMSD	Unitless	int16	0~10000	-9999	0.0001	-	Emissivity standard deviation
ST_CDIST	Kilometers	int16	0~24000	-9999	0.01	-	Pixel distance to cloud

QA_PIXEL Bit Index
Bit 0: Fill 0: Image data1: Fill dataBit 1: Dilated Cloud 0: Cloud is not dilated or no cloud1: Cloud dilationBit 2: Cirrus 0: Cirrus Confidence: no confidence level set or Low Confidence1: High confidence cirrusBit 3: Cloud 0: Cloud confidence is not high1: High confidence cloudBit 4: Cloud shadow 0: Cloud Shadow Confidence is not high1: High confidence cloud shadowBit 5: Snow 0: Snow/Ice Confidence is not high1: High confidence snow coverBit 6: Clear 0: Cloud or Dilated Cloud bits are set1: Cloud and Dilated Cloud bits are not setBit 7: Water 0: Land or cloud1: WaterBits 8-9: Cloud Confidence 00: No confidence level set01: Low confidence10: Medium confidence11: High confidenceBits 10-11: Cloud Shadow Confidence 00: No confidence level set01: Low confidence10: Reserved11: High confidenceBits 12-13: Snow/Ice Confidence 00: No confidence level set01: Low confidence10: Reserved11: High confidenceBits 14-15: Cirrus Confidence 00: No confidence level set01: Low confidence10: Reserved11: High confidence

QA_PIXEL Bit Index

Bit 0: Fill 0: Image data1: Fill dataBit 1: Dilated Cloud 0: Cloud is not dilated or no cloud1: Cloud dilationBit 2: Cirrus 0: Cirrus Confidence: no confidence level set or Low Confidence1: High confidence cirrusBit 3: Cloud 0: Cloud confidence is not high1: High confidence cloudBit 4: Cloud shadow 0: Cloud Shadow Confidence is not high1: High confidence cloud shadowBit 5: Snow 0: Snow/Ice Confidence is not high1: High confidence snow coverBit 6: Clear 0: Cloud or Dilated Cloud bits are set1: Cloud and Dilated Cloud bits are not setBit 7: Water 0: Land or cloud1: WaterBits 8-9: Cloud Confidence 00: No confidence level set01: Low confidence10: Medium confidence11: High confidenceBits 10-11: Cloud Shadow Confidence 00: No confidence level set01: Low confidence10: Reserved11: High confidenceBits 12-13: Snow/Ice Confidence 00: No confidence level set01: Low confidence10: Reserved11: High confidenceBits 14-15: Cirrus Confidence 00: No confidence level set01: Low confidence10: Reserved11: High confidence

Bit 0: Fill
- 0: Image data
- 1: Fill data
Bit 1: Dilated Cloud
- 0: Cloud is not dilated or no cloud
- 1: Cloud dilation
Bit 2: Cirrus
- 0: Cirrus Confidence: no confidence level set or Low Confidence
- 1: High confidence cirrus
Bit 3: Cloud
- 0: Cloud confidence is not high
- 1: High confidence cloud
Bit 4: Cloud shadow
- 0: Cloud Shadow Confidence is not high
- 1: High confidence cloud shadow
Bit 5: Snow
- 0: Snow/Ice Confidence is not high
- 1: High confidence snow cover
Bit 6: Clear
- 0: Cloud or Dilated Cloud bits are set
- 1: Cloud and Dilated Cloud bits are not set
Bit 7: Water
- 0: Land or cloud
- 1: Water
Bits 8-9: Cloud Confidence
- 00: No confidence level set
- 01: Low confidence
- 10: Medium confidence
- 11: High confidence
Bits 10-11: Cloud Shadow Confidence
- 00: No confidence level set
- 01: Low confidence
- 10: Reserved
- 11: High confidence
Bits 12-13: Snow/Ice Confidence
- 00: No confidence level set
- 01: Low confidence
- 10: Reserved
- 11: High confidence
Bits 14-15: Cirrus Confidence
- 00: No confidence level set
- 01: Low confidence
- 10: Reserved
- 11: High confidence

QA_RADSAT Bit Index
Bit 0: Band 1 Data Saturation 0: No saturation1: Saturated dataBit 1: Band 2 Data Saturation 0: No saturation1: Saturated dataBit 2: Band 3 Data Saturation 0: No saturation1: Saturated dataBit 3: Band 4 Data Saturation 0: No saturation1: Saturated dataBit 4: Band 5 Data Saturation 0: No saturation1: Saturated dataBit 5: Band 6 Data Saturation 0: No saturation1: Saturated dataBit 6: Band 7 Data Saturation 0: No saturation1: Saturated dataBit 8: Band 9 Data Saturation 0: No saturation1: Saturated dataBit 11: Terrain occlusion 0: No terrain occlusion1: Terrain occlusion

QA_RADSAT Bit Index

Bit 0: Band 1 Data Saturation 0: No saturation1: Saturated dataBit 1: Band 2 Data Saturation 0: No saturation1: Saturated dataBit 2: Band 3 Data Saturation 0: No saturation1: Saturated dataBit 3: Band 4 Data Saturation 0: No saturation1: Saturated dataBit 4: Band 5 Data Saturation 0: No saturation1: Saturated dataBit 5: Band 6 Data Saturation 0: No saturation1: Saturated dataBit 6: Band 7 Data Saturation 0: No saturation1: Saturated dataBit 8: Band 9 Data Saturation 0: No saturation1: Saturated dataBit 11: Terrain occlusion 0: No terrain occlusion1: Terrain occlusion

Bit 0: Band 1 Data Saturation
- 0: No saturation
- 1: Saturated data
Bit 1: Band 2 Data Saturation
- 0: No saturation
- 1: Saturated data
Bit 2: Band 3 Data Saturation
- 0: No saturation
- 1: Saturated data
Bit 3: Band 4 Data Saturation
- 0: No saturation
- 1: Saturated data
Bit 4: Band 5 Data Saturation
- 0: No saturation
- 1: Saturated data
Bit 5: Band 6 Data Saturation
- 0: No saturation
- 1: Saturated data
Bit 6: Band 7 Data Saturation
- 0: No saturation
- 1: Saturated data
Bit 8: Band 9 Data Saturation
- 0: No saturation
- 1: Saturated data
Bit 11: Terrain occlusion
- 0: No terrain occlusion
- 1: Terrain occlusion

QA_AEROSOL Bit Index
Bit 0: Fill 0: Pixel is not fill1: Pixel is fillBit 1: Valid aerosol retrieval 0: Pixel retrieval is not valid1: Pixel retrieval is validBit 2: Water 0: Pixel is not water1: Pixel is waterBit 5: Interpolated Aerosol 0: Pixel is not aerosol interpolated1: Pixel is aerosol interpolatedBits 6-7: Aerosol Level 00: Climatology01: Low10: Medium11: High

Bit 0: Fill
- 0: Pixel is not fill
- 1: Pixel is fill
Bit 1: Valid aerosol retrieval
- 0: Pixel retrieval is not valid
- 1: Pixel retrieval is valid
Bit 2: Water
- 0: Pixel is not water
- 1: Pixel is water
Bit 5: Interpolated Aerosol
- 0: Pixel is not aerosol interpolated
- 1: Pixel is aerosol interpolated
Bits 6-7: Aerosol Level
- 00: Climatology
- 01: Low
- 10: Medium
- 11: High

属性

landsat_product_id	string	影像名称
processing_level	string	产品级别
date_acquired	string	拍摄日期（ISO 8601格式）
collection_category	string	影像质量级别属性,如T2，T1等
cloud_cover	float	云量覆盖百分比，-1表示未计算
sun_azimuth	double	太阳方位角
sun_elevation	double	太阳高度角
sensor_id	string	传感器类型
wrs_path	int	条带号
wrs_row	int	行编号
date	string	影像日期

代码：

/**
 * @File    :   HelloPIE
 * @Time    :   2020/7/21
 * @Author  :   piesat
 * @Version :   1.0
 * @Contact :   400-890-0662
 * @License :   (C)Copyright 航天宏图信息技术股份有限公司
 * @Desc    :   时空计算云服务平台的入门程序
 */
//地图居中并且缩放到第6级别
Map.setCenter(120.254, 41.726, 6);
//设置显示显示参数
var visParam = {
    min: 0,
    max: 0.3,
    bands: ["B4","B3","B2"]
};
//加载指定的影像数据数据，筛选特定的波段数据
var image = pie.Image("LC08/02/SR/LC08_121031_20170101")
               .select(["B4","B3","B2"])
               .multiply(0.0000275)
               .subtract(0.2);
//输出影像的信息
print("image", image);
//加载显示影像
Map.addLayer(image, visParam, "image");