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
Name | Description | Min | Max | Units | Scale |
---|---|---|---|---|---|
Gpp | Gross primary production | 0 | 3000 | kg*C/m^2 | 0.0001 |
PsnNet | Net photosynthesis; GPP minus the maintenance respiration (MR) | -3000 | 3000 | kg*C/m^2 | 0.0001 |
Psn_QC | Quality control bits | 0 | |||
Psn_QC Bitmask | Bit 0: MODLAND QC bits 0: Good quality1: Other qualityBit 1: Sensor 0: Terra1: AquaBit 2: Dead detector 0: Detectors apparently fine for up to 50% of channels 1, 21: Dead detectors caused >50% adjacent detector retrievalBits 3-4: Cloud state 0: Significant clouds NOT present (clear)1: Significant clouds WERE present2: Mixed cloud present on pixel3: Cloud state not defined, assumed clearBits 5-7: 5-level confidence quality score 0: Very best possible1: Good, very usable, but not the best2: Substandard due to geometry problems - use with caution3: Substandard due to other than geometry problems - use with caution4: 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.
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');