Google Earth Engine ——MYD11A2中的每個像素值是該8天内收集的所有相應的MOD11A1 LST像素的簡單平均值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産品提供了一個1200 x 1200公裡網格内的8天平均陸地表面溫度（LST）。MYD11A2中的每個像素值是該8天内收集的所有相應的MOD11A1 LST像素的簡單平均值。選擇8天的合成期是因為這段時間的兩倍正是Aqua和Aqua平台的地面軌道重複期。在這個産品中，除了白天和夜間的地表溫度帶及其品質名額（QC）層之外，還有MODIS的31和32帶以及8個觀測層。

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
QC_Day	Daytime LST quality indicators
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	240	Hours	0.1
Day_view_angl	View zenith angle of day observation	130	Degrees	1	-65
LST_Night_1km	Night land surface temperature	7500	65635	Kelvin	0.02
QC_Night	Nighttime LST quality indicators
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	240	Hours	0.1
Night_view_angl	View zenith angle of night observation	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
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
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

使用說明：

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

引用：

 ​​LP DAAC - MYD11A2​​

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');