Google Earth Engine——NCEP/NCAR再分析项目是美国国家环境预测中心（NCEP，前身为 “NMC“）和美国国家大气研究中心（NCAR）地表降水数据

The NCEP/NCAR Reanalysis Project is a joint project between the National Centers for Environmental Prediction (NCEP, formerly "NMC") and the National Center for Atmospheric Research (NCAR). The goal of this joint effort is to produce new atmospheric analyses using historical data as well as to produce analyses of the current atmospheric state (Climate Data Assimilation System, CDAS). The NCEP/NCAR Reanalysis 1 project is using a state-of-the-art analysis/forecast system to perform data assimilation using past data from 1948 to the present. The data have 6-hour temporal resolution (0000, 0600, 1200, and 1800 UTC) and 2.5 degree spatial resolution.

NCEP/NCAR再分析项目是美国国家环境预测中心（NCEP，前身为 "NMC"）和美国国家大气研究中心（NCAR）的一个联合项目。这项联合工作的目标是利用历史数据产生新的大气分析，以及产生对当前大气状态的分析（气候数据同化系统，CDAS）。NCEP/NCAR Reanalysis 1项目正在使用最先进的分析/预报系统，利用1948年至今的过去数据进行数据同化。这些数据具有6小时的时间分辨率（0000、0600、1200和1800 UTC）和2.5度的空间分辨率。

Dataset Availability

1948-01-01T00:00:00 - 2021-09-27T00:00:00

Dataset Provider

NCEP

Collection Snippet

ee.ImageCollection("NCEP_RE/surface_wv")

Resolution

278300 meters

Bands Table

* = Values are estimated

数据引用：

Kalnay et al., 1996, The NCEP/NCAR 40-Year Reanalysis Project. Bull. Amer. Meteor. Soc., 77, 437-471. doi:10.1175/1520-0477(1996)077<0437:TNYRP>2.0.CO;2.

代码：

var dataset = ee.ImageCollection('NCEP_RE/surface_wv')
                  .filter(ee.Filter.date('2018-08-01', '2018-08-15'));
var totalColumnWaterVapor = dataset.select('pr_wtr');
var totalColumnWaterVaporVis = {
  min: 0.0,
  max: 60.0,
  palette: ['0000ff', '00ffff', '008000', 'ffff00', 'ff0000'],
};
Map.setCenter(-158.2, 2.81, 2);
Map.addLayer(
    totalColumnWaterVapor, totalColumnWaterVaporVis,
    'Total Column Water Vapor');