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Google Earth Engine ——MYD11A2中的每个像素值是该8天内收集的所有相应的MOD11A1 LST像素的简单平均值1km分辨率

The MYD11A2 V6 product provides an average 8-day land surface temperature (LST) in a 1200 x 1200 kilometer grid. Each pixel value in MYD11A2 is a simple average of all the corresponding MOD11A1 LST pixels collected within that 8 day period. The 8 day compositing period was chosen because twice that period is the exact ground track repeat period of the Aqua and Aqua platforms. In this product, along with both the day- and night-time surface temperature bands and their quality indicator (QC) layers, are also MODIS bands 31 and 32 and eight observation layers.

Documentation:

  • ​​User's Guide​​
  • ​​Algorithm Theoretical Basis Document (ATBD)​​
  • ​​General Documentation​​

MYD11A2 V6产品提供了一个1200 x 1200公里网格内的8天平均陆地表面温度(LST)。MYD11A2中的每个像素值是该8天内收集的所有相应的MOD11A1 LST像素的简单平均值。选择8天的合成期是因为这段时间的两倍正是Aqua和Aqua平台的地面轨道重复期。在这个产品中,除了白天和夜间的地表温度带及其质量指标(QC)层之外,还有MODIS的31和32带以及8个观测层。

Dataset Availability

2002-07-04T00:00:00 - 2021-09-14T00:00:00

Dataset Provider

​​NASA LP DAAC at the USGS EROS Center​​

Collection Snippet

​ee.ImageCollection("MODIS/006/MYD11A2")​

Resolution

1000 meters

Bands Table

Name

Description

Min

Max

Units

Scale

Offset

LST_Day_1km

Day land surface temperature

7500

65535

Kelvin

0.02

0

QC_Day

Daytime LST quality indicators

0

0

QC_Day Bitmask



  • Bits 0-1: Mandatory QA flags
  • 0: Pixel produced, good quality, not necessary to examine more detailed QA
  • 1: Pixel produced, unreliable or unquantifiable quality, recommend examination of more detailed QA
  • 2: Pixel not produced due to cloud effects
  • 3: Pixel not produced primarily due to reasons other than cloud (such as ocean pixel, poor input data)
  • Bits 2-3: Data quality flag
  • 0: Good data quality
  • 1: Other quality data
  • 2: TBD
  • 3: TBD
  • Bits 4-5: Emissivity error flag
  • 0: Average emissivity error ≤ 0.01
  • 1: Average emissivity error ≤ 0.02
  • 2: Average emissivity error ≤ 0.04
  • 3: Average emissivity error > 0.04
  • Bits 6-7: LST error flag
  • 0: Average LST error ≤ 1K
  • 1: Average LST error ≤ 2K
  • 2: Average LST error ≤ 3K
  • 3: Average LST error > 3K

Day_view_time

Local time of day observation

0

240

Hours

0.1

0

Day_view_angl

View zenith angle of day observation

0

130

Degrees

1

-65

LST_Night_1km

Night land surface temperature

7500

65635

Kelvin

0.02

0

QC_Night

Nighttime LST quality indicators

0

0

QC_Night Bitmask



  • Bits 0-1: Mandatory QA flags
  • 0: Pixel produced, good quality, not necessary to examine more detailed QA
  • 1: Pixel produced, unreliable or unquantifiable quality, recommend examination of more detailed QA
  • 2: Pixel not produced due to cloud effects
  • 3: Pixel not produced primarily due to reasons other than cloud (such as ocean pixel, poor input data)
  • Bits 2-3: Data quality flag
  • 0: Good data quality
  • 1: Other quality data
  • 2: TBD
  • 3: TBD
  • Bits 4-5: Emissivity error flag
  • 0: Average emissivity error ≤ 0.01
  • 1: Average emissivity error ≤ 0.02
  • 2: Average emissivity error ≤ 0.04
  • 3: Average emissivity error > 0.04
  • Bits 6-7: LST error flag
  • 0: Average LST error ≤ 1K
  • 1: Average LST error ≤ 2K
  • 2: Average LST error ≤ 3K
  • 3: Average LST error > 3K

Night_view_time

Local time of night observation

0

240

Hours

0.1

0

Night_view_angl

View zenith angle of night observation

0

130

Degrees

1

-65

Emis_31

Band 31 emissivity

1

255

0.002

0.49

Emis_32

Band 32 emissivity

1

255

0.002

0.49

Clear_sky_days

Days in clear-sky conditions

0

0

Clear_sky_days Bitmask



  • Bit 0: Day 1 clear sky flag
  • 0: Day 1 is not clear-sky
  • 1: Day 1 is clear-sky
  • Bit 1: Day 2 clear sky flag
  • 0: Day 2 is not clear-sky
  • 1: Day 2 is clear-sky
  • Bit 2: Day 3 clear sky flag
  • 0: Day 3 is not clear-sky
  • 1: Day 3 is clear-sky
  • Bit 3: Day 4 clear sky flag
  • 0: Day 4 is not clear-sky
  • 1: Day 4 is clear-sky
  • Bit 4: Day 5 clear sky flag
  • 0: Day 5 is not clear-sky
  • 1: Day 5 is clear-sky
  • Bit 5: Day 6 clear sky flag
  • 0: Day 6 is not clear-sky
  • 1: Day 6 is clear-sky
  • Bit 6: Day 7 clear sky flag
  • 0: Day 7 is not clear-sky
  • 1: Day 7 is clear-sky
  • Bit 7: Day 8 clear sky flag
  • 0: Day 8 is not clear-sky
  • 1: Day 8 is clear-sky

Clear_sky_nights

Nights in clear-sky conditions

0

0

Clear_sky_nights Bitmask



  • Bit 0: Night 1 clear sky flag
  • 0: Night 1 is not clear-sky
  • 1: Night 1 is clear-sky
  • Bit 1: Night 2 clear sky flag
  • 0: Night 2 is not clear-sky
  • 1: Night 2 is clear-sky
  • Bit 2: Night 3 clear sky flag
  • 0: Night 3 is not clear-sky
  • 1: Night 3 is clear-sky
  • Bit 3: Night 4 clear sky flag
  • 0: Night 4 is not clear-sky
  • 1: Night 4 is clear-sky
  • Bit 4: Night 5 clear sky flag
  • 0: Night 5 is not clear-sky
  • 1: Night 5 is clear-sky
  • Bit 5: Night 6 clear sky flag
  • 0: Night 6 is not clear-sky
  • 1: Night 6 is clear-sky
  • Bit 6: Night 7 clear sky flag
  • 0: Night 7 is not clear-sky
  • 1: Night 7 is clear-sky
  • Bit 7: Night 8 clear sky flag
  • 0: Night 8 is not clear-sky
  • 1: Night 8 is clear-sky

使用说明:

MODIS data and products acquired through the LP DAAC have no restrictions on subsequent use, sale, or redistribution.

引用:

 ​​LP DAAC - MYD11A2​​

代码:

var dataset = ee.ImageCollection('MODIS/006/MYD11A2')
.filter(ee.Filter.date('2018-01-01', '2018-05-01'));
var landSurfaceTemperature = dataset.select('LST_Day_1km');
var landSurfaceTemperatureVis = {
min: 14000.0,
max: 16000.0,
palette: [
'040274', '040281', '0502a3', '0502b8', '0502ce', '0502e6',
'0602ff', '235cb1', '307ef3', '269db1', '30c8e2', '32d3ef',
'3be285', '3ff38f', '86e26f', '3ae237', 'b5e22e', 'd6e21f',
'fff705', 'ffd611', 'ffb613', 'ff8b13', 'ff6e08', 'ff500d',
'ff0000', 'de0101', 'c21301', 'a71001', '911003'
],
};
Map.setCenter(6.746, 46.529, 2);
Map.addLayer(
landSurfaceTemperature, landSurfaceTemperatureVis,
'Land Surface Temperature');

Google Earth Engine ——MYD11A2中的每个像素值是该8天内收集的所有相应的MOD11A1 LST像素的简单平均值1km分辨率_数据集

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