Google Earth engine - QA in Landsat 5 toa dataset_ Pixel and QA_ Radsat band

​

Before going to the cloud, we learned about QA_PIXEL Conduct cloud removal , But I don't know QA_RADSAT What's the use of time , Let's introduce , First, let's take a look at the brief introduction of the data ： of QA The articles of band to cloud can go to ：

(1248 Bar message ) Google Earth Engine（GEE）——Landsat 8SR and T1_L2 The difference between data cloud removal ( Liaoning Province as an example )_ This star bright blog -CSDN Blog

(1248 Bar message ) Google Earth Engine（GEE）——Landsat TOA Image a new cloud removal method _ This star bright blog -CSDN Blog

(1248 Bar message ) Google Earth Engine（GEE）——Landsat SR Image cloud removal function _ This star bright blog -CSDN Blog

(1248 Bar message ) Earth engine nanny tutorial —— Two cloud removal methods ：ee.Algorithms.Landsat.simpleComposite Go to Yunhe QA Mask code cloud removal method _ This star bright blog -CSDN Blog _landsat De cloud processing

Google Earth Engine（GEE）——Landsat9 Take Qinghai Province as an example _ This star bright blog -CSDN Blog

Dataset availability
1984-03-16T16:18:01 - 2012-05-05T17:54:06
Data set provider
U.S. Geological Survey

GEE References on
ee.ImageCollection("LANDSAT/LT05/C02/T1_L2")

Landsat Collection 2 Level-1 and Level-2 Quality assessment (QA) Bands provide useful information for users who want to optimize pixel values , As Landsat The first level indicator of some conditions in the data . 

return Landsat Collection 2 Information

Collection 2 Level-1 The product comes with a pixel quality evaluation belt (QA_Pixel) And radiation saturation quality assessment zone (QA_RADSAT).Collection 2 Level-2 product （ Limited to Landsats 4-8） Include Level-1 QA Band and Landsat 8 Surface reflection aerosol QA Band (SR_QA_AEROSOL)、Landsat 4- Surface reflection cloud quality assessment band (SR_Cloud_QA) 7, as well as Landsat 4-8 Surface temperature of QA Band (ST_QA), It can provide consistent QA Information . 

Visit the The documentation section To obtain information about QA Other technical details of the document . 

Landsat Collection 2 Level-1 and Level-2 QA Band

Pixel quality evaluation band (QA_PIXEL)

QA_PIXEL The band file contains quality statistics collected from the scene's image data and cloud mask information .

*  2021 year 2 month , stay Landsat 4-7 Water scene Pixel QA“ Clear bit ”（ position 6） A problem was found in . More details about this issue , Please visit Landsat Collection 2 Known problems   page .

Radiation saturation quality assessment band (QA_RADSAT)

QA_RADSAT The band indicates which sensor bands are saturated . When due to the middle terrain （ Limited to Landsat 8-9） When the required terrain cannot be seen from the sensor, set the terrain occlusion position , And set the discard pixel bit when discarding pixels （Landsat 1-7）.

​

edit

source / purpose ： Public domain .

Landsat Collection 2 Radiation saturation quality assessment (QA_RADSAT) Bit index . 

Landsat Collection 2 Level-2 QA Band

Surface reflection quality evaluation band (SR_QA_AEROSOL) – Landsat 8/9

SR_QA_AEROSOL Band and Landsat 8/9 Surface reflection products are provided together , To provide low-level details about factors that may affect the final product results , And show whether aerosol is an effective retrieval , Or whether it is a point interpolated from the surrounding grid .

​

edit

source / purpose ： Public domain .

Landsat Collection 2 Surface Reflectance Quality Assessment Band (SR_QA_AEROSOL) Bit index . 

Surface reflection cloud quality assessment band (SR_Cloud_QA) – Landsat 4-7

SR Cloud QA File with the QA Band File sharing some data artifacts and surface classification instructions .SR Cloud QA The file is used 2 level LEDAPS Generated , And in 1 Level generated QA_Pixel Band Different documents

​

edit

source / purpose ： Public domain .

Landsat Collection 2 Surface Reflectance Cloud Quality Assessment Band (SR_Cloud_QA) Bit index . 

Surface temperature quality assessment zone (ST_QA)

ST QA The document indicates that ST The uncertainty of temperature given in the band file .ST QA The file is generated using uncertainty values and distance to cloud values . The larger the number, the greater the uncertainty . Generate only SR Product time , This file is not included in the product .

​

Global forest loss data set Hansen Global Forest Change v1.8 (2000-2020)

GEEer Happiness | It's for the sake of whoring for nothing ！ Analyze and dig ,NDVI、 Unsupervised classification, etc

Daniel's artificial intelligence learning website ： A course of bed length artificial intelligence

Google Earth Engine（GEE）—— Divine auxiliary plug-in （ Open earth engine expansion (OEEex)）

1975 Global land survey (GLS) Is from Landsat 1-4 Synthetic global image collection
Google Earth Engine（GEE）——Sentinel-3 OLCI EFR： Ocean and land color earth observation full resolution data set

Using sentinels （Sentinel-1/2） data , Rice range identification and mapping of rice planting seasons — Take Malaysia for example

Google Earth Engine（GEE）—— Country identifier grid dataset