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Google Earth Engine ——MYD17A2H/A3H/GF V6总初级生产力（GPP）产品是一个具有500米分辨率的8天/16天累积综合数据。

Google数据产品 一个 16 Engine Earth 综合
2023-09-11 14:15:12 时间

The MYD17A2H V6 Gross Primary Productivity (GPP) product is a cumulative 8-day composite with a 500m resolution. The product is based on the radiation-use efficiency concept and can be potentially used as inputs to data models to calculate terrestrial energy, carbon, water cycle processes, and biogeochemistry of vegetation.

Documentation:

MYD17A2H V6总初级生产力（GPP）产品是一个具有500米分辨率的8天累积综合数据。该产品基于辐射利用效率的概念，可作为数据模型的输入，计算陆地能源、碳、水循环过程和植被的生物地球化学。

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/MYD17A2H")

Resolution

500 meters

Bands Table

NameDescriptionMinMaxUnitsScale
GppGross primary production03000kg*C/m^20.0001
PsnNetNet photosynthesis; GPP minus the maintenance respiration (MR)-30003000kg*C/m^20.0001
Psn_QCQuality control bits0
Psn_QC Bitmask
  • Bit 0: MODLAND QC bits
    • 0: Good quality
    • 1: Other quality
  • Bit 1: Sensor
    • 0: Terra
    • 1: Aqua
  • Bit 2: Dead detector
    • 0: Detectors apparently fine for up to 50% of channels 1, 2
    • 1: Dead detectors caused >50% adjacent detector retrieval
  • Bits 3-4: Cloud state
    • 0: Significant clouds NOT present (clear)
    • 1: Significant clouds WERE present
    • 2: Mixed cloud present on pixel
    • 3: Cloud state not defined, assumed clear
  • Bits 5-7: 5-level confidence quality score
    • 0: Very best possible
    • 1: Good, very usable, but not the best
    • 2: Substandard due to geometry problems - use with caution
    • 3: Substandard due to other than geometry problems - use with caution
    • 4: Couldn't retrieve pixel (NOT PRODUCED AT ALL - non-terrestrial biome)
    • 7: Fill Value

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 - MYD17A2H

代码： 

var dataset = ee.ImageCollection('MODIS/006/MYD17A2H')
                  .filter(ee.Filter.date('2018-01-01', '2018-05-01'));
var gpp = dataset.select('Gpp');
var gppVis = {
  min: 0.0,
  max: 600.0,
  palette: ['bbe029', '0a9501', '074b03'],
};
Map.setCenter(6.746, 46.529, 2);
Map.addLayer(gpp, gppVis, 'GPP');

var dataset = ee.ImageCollection('MODIS/006/MYD17A3H')
                  .filter(ee.Filter.date('2014-01-01', '2014-05-01'));

var npp = dataset.select('Npp');
var nppVis = {
  min: 0.0,
  max: 19000.0,
  palette: ['bbe029', '0a9501', '074b03'],
};
Map.setCenter(6.746, 46.529, 2);
Map.addLayer(npp, nppVis, 'NPP');


var dataset = ee.ImageCollection('MODIS/006/MYD17A3HGF')
                  .filter(ee.Filter.date('2014-01-01', '2014-05-01'));

var npp = dataset.select('Npp');
var nppVis = {
  min: 0.0,
  max: 19000.0,
  palette: ['bbe029', '0a9501', '074b03'],
};
Map.setCenter(6.746, 46.529, 2);
Map.addLayer(npp, nppVis, 'NPP');

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