Google Earth Engine ——MYD13A1/A2.006 Aqua Vegetation Indices 8/16-Day Global 500m(NDVI和EVI)指数数据集

简介: Google Earth Engine ——MYD13A1/A2.006 Aqua Vegetation Indices 8/16-Day Global 500m(NDVI和EVI)指数数据集

The MYD13A1 V6 product provides a Vegetation Index (VI) value at a per pixel basis. There are two primary vegetation layers. The first is the Normalized Difference Vegetation Index (NDVI) which is referred to as the continuity index to the existing National Oceanic and Atmospheric Administration-Advanced Very High Resolution Radiometer (NOAA-AVHRR) derived NDVI. The second vegetation layer is the Enhanced Vegetation Index (EVI) that minimizes canopy background variations and maintains sensitivity over dense vegetation conditions. The EVI also uses the blue band to remove residual atmosphere contamination caused by smoke and sub-pixel thin cloud clouds. The MODIS NDVI and EVI products are computed from atmospherically corrected bi-directional surface reflectances that have been masked for water, clouds, heavy aerosols, and cloud shadows.


MYD13A1 V6产品在每个像素的基础上提供植被指数(VI)值。有两个主要的植被层。第一个是归一化植被指数(NDVI),它被称为现有的国家海洋和大气管理局-高级甚高分辨率辐射计(NOAA-AVHRR)得出的NDVI的连续性指数。第二个植被层是增强植被指数(EVI),它将树冠背景变化降到最低,并保持对茂密植被条件的敏感性。EVI还使用蓝色波段来消除由烟雾和亚像素薄云造成的残留大气污染。MODIS NDVI和EVI产品是由经过大气校正的双向表面反射率计算出来的,这些反射率已经屏蔽了水、云、重气溶胶和云影。

Documentation:

Dataset Availability

2002-07-04T00:00:00 - 2021-09-06T00:00:00

Dataset Provider

NASA LP DAAC at the USGS EROS Center

Collection Snippet

Copied

ee.ImageCollection("MODIS/006/MYD13A1")

Resolution

500 meters

Bands Table

Name Description Min Max Units Wavelength Scale
NDVI Normalized Difference Vegetation Index -2000 10000 0.0001
EVI Enhanced Vegetation Index -2000 10000 0.0001
DetailedQA VI quality indicators 0
DetailedQA Bitmask
  • Bits 0-1: VI quality (MODLAND QA Bits)
    • 0: VI produced with good quality
    • 1: VI produced, but check other QA
    • 2: Pixel produced, but most probably cloudy
    • 3: Pixel not produced due to other reasons than clouds
  • Bits 2-5: VI usefulness
    • 0: Highest quality
    • 1: Lower quality
    • 2: Decreasing quality
    • 4: Decreasing quality
    • 8: Decreasing quality
    • 9: Decreasing quality
    • 10: Decreasing quality
    • 12: Lowest quality
    • 13: Quality so low that it is not useful
    • 14: L1B data faulty
    • 15: Not useful for any other reason/not processed
  • Bits 6-7: Aerosol Quantity
    • 0: Climatology
    • 1: Low
    • 2: Intermediate
    • 3: High
  • Bit 8: Adjacent cloud detected
    • 0: No
    • 1: Yes
  • Bit 9: Atmosphere BRDF correction
    • 0: No
    • 1: Yes
  • Bit 10: Mixed Clouds
    • 0: No
    • 1: Yes
  • Bits 11-13: Land/water mask
    • 0: Shallow ocean
    • 1: Land (nothing else but land)
    • 2: Ocean coastlines and lake shorelines
    • 3: Shallow inland water
    • 4: Ephemeral water
    • 5: Deep inland water
    • 6: Moderate or continental ocean
    • 7: Deep ocean
  • Bit 14: Possible snow/ice
    • 0: No
    • 1: Yes
  • Bit 15: Possible shadow
    • 0: No
    • 1: Yes
sur_refl_b01 Red surface reflectance 0 10000 645nm 0.0001
sur_refl_b02 NIR surface reflectance 0 10000 858nm 0.0001
sur_refl_b03 Blue surface reflectance 0 10000 469nm 0.0001
sur_refl_b07 MIR surface reflectance 0 10000 2130nm/2105 - 2155nm 0.0001
ViewZenith View zenith angle 0 18000 Degrees 0.01
SolarZenith Solar zenith angle 0 18000 Degrees 0.01
RelativeAzimuth Relative azimuth angle -18000 18000 Degrees 0.01
DayOfYear Julian day of year 1 366 0
SummaryQA Quality reliability of VI pixel 0
SummaryQA Bitmask
  • Bits 0-1: VI quality (MODLAND QA Bits)
    • 0: Good data, use with confidence
    • 1: Marginal data, useful but look at detailed QA for more information
    • 2: Pixel covered with snow/ice
    • 3: Pixel is cloudy

使用说明:

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

引用:

代码:

var dataset = ee.ImageCollection('MODIS/006/MYD13A1')
                  .filter(ee.Filter.date('2018-01-01', '2018-05-01'));
var ndvi = dataset.select('NDVI');
var ndviVis = {
  min: 0.0,
  max: 9000.0,
  palette: [
    'FFFFFF', 'CE7E45', 'DF923D', 'F1B555', 'FCD163', '99B718', '74A901',
    '66A000', '529400', '3E8601', '207401', '056201', '004C00', '023B01',
    '012E01', '011D01', '011301'
  ],
};
Map.setCenter(6.746, 46.529, 2);
Map.addLayer(ndvi, ndviVis, 'NDVI');


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