转摘Google Earth Engine ——MOD17A3H.006: Terra Net Primary Production Yearly Global 500m这是该产品的NASA版本年度净初级

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The MOD17A3H V6 product provides information about annual Net Primary Productivity (NPP) at 500m pixel resolution. Annual NPP is derived from the sum of the 45 8-day Net Photosynthesis (PSN) products (MOD17A2H) from the given year. The PSN value is the difference of the GPP and the Maintenance Respiration (MR) (GPP-MR).

This is a NASA version of this product. Another version is produced by the Numerical Terradynamic Simulation Group ([NTSG](https://www.ntsg.umt.edu/ "NTSG")), University of Montana (UMT). The NTSG version corrects the problem with cloud-contaminated MODIS LAI-FPAR inputs to the MOD17 algorithm, but its resolution is 1km. It is ingested into Earth Engine as MODIS/055/MOD17A3.

For further details regarding the differences between the NTSG and NASA versions of this product, please consult [this document](https://lpdaac.usgs.gov/documents/188/MOD17_NTSG_Note.pdf "this document ").

MOD17A3H V6产品提供500米像素分辨率的年度净初级生产力（NPP）信息。年净初级生产力是由给定年份的45个8天净光合作用（PSN）产品（MOD17A2H）之和得出的。PSN值是GPP和维持呼吸（MR）之差（GPP-MR）。

这是该产品的NASA版本。另一个版本是由蒙大拿大学（UMT）的数字地球动力学模拟小组（NTSG）制作的。NTSG版本纠正了MOD17算法中被云层污染的MODIS LAI-FPAR输入的问题，但其分辨率为1公里。它作为MODIS/055/MOD17A3被录入地球引擎。

关于该产品的NTSG和NASA版本之间的差异的进一步细节，请参考该文件。


Dataset Availability

2000-01-01T00:00:00 - 2014-01-01T00:00:00

Dataset Provider

[NASA LP DAAC at the USGS EROS Center](https://doi.org/10.5067/MODIS/MOD17A3H.006 "NASA LP DAAC at the USGS EROS Center")

Collection Snippet

ee.ImageCollection("MODIS/006/MOD17A3H")

Resolution

500 meters

Bands Table

Name Description Min Max Units Scale
Npp Net primary productivity -3000 32700 kg*C/m^2 0.0001
Npp_QC Quality control bits 0
Npp_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.

数据引用：

[LP DAAC - MOD17A3H](https://doi.org/10.5067/MODIS/MOD17A3H.006 "LP DAAC - MOD17A3H")

代码：

javascript 复制代码 
var dataset = ee.ImageCollection('MODIS/006/MOD17A3H')
                  .filter(ee.Filter.date('2014-01-01', '2015-05-01'));
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');

![](https://img-blog.csdnimg.cn/20210925162437987.png?x-oss-process=image/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBA5q2k5pif5YWJ5piO,size_20,color_FFFFFF,t_70,g_se,x_16)


复制代码 
    ===========================
    【来源： CSDN】
    【作者： 此星光明】
    【原文链接】 https://blog.csdn.net/qq_31988139/article/details/120473474
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