Google Earth Engine ——GCOM

该乘积是海表层浮游植物中光合色素（叶绿素-a）的浓度。 更新版本的 JAXA/GCOM-C/L3/OCEAN/CHLA/V1 也可用于此数据集，该数据集使用此算法进行处理。 GCOM-C 进行长期和持续的全球观测和数据收集，以阐明辐射收支和碳循环波动背后的机制，从而对未来温度上升做出准确预测。同时，与有气候数值模型的研究机构合作，有助于减少气候数值模型得出的温升预测误差，提高各种环境变化的预测精度。安装在 GCOM-C 上的 SGLI 是安装在 ADEOS-II (MIDORI II) 上的 Global Imager (GLI) 的连续传感器，是测量从近紫外到热红外区域 (380 nm-12 um) 的辐射的成像辐射计在 19 个频道中。在日本附近的中纬度地区，地面观测宽度超过 1,000 公里，可以进行大约每两天一次的全球观测。此外，SGLI 实现了比同类全局传感器更高的分辨率，并具有偏振观测功能和多角度观测功能。

 Dataset Availability

2018-01-01T00:00:00 - 2020-06-28T00:00:00

Dataset Provider

Global Change Observation Mission (GCOM)

Collection Snippet

ee.ImageCollection("JAXA/GCOM-C/L3/OCEAN/CHLA/V2")

Resolution

2.5 arc minutes

Bands Table

NameDescriptionMin*Max*UnitsCHLA_AVEConcentration of the green pigment (chlorophyll-a) in phytoplankton in sea surface layer.04000mg/m^3CHLA_QA_flagCHLA QACHLA_QA_flag Bitmask Bits 0-1: Terrain type 0: water (land fraction = 0%)1: mostly water (0% < land fraction < 50%)2: mostly coastal (50% < land fraction < 100%)3: land (land fraction = 100%)

* = Values are estimated

影像属性：

NameTypeDescriptionALGORITHM_VERSIONStringAlgorithm versionGRID_INTERVALStringSpatial resolutionGRID_INTERVAL_UNITStringUnit of GRID_INTERVALIMAGE_END_TIMEStringImage acquisition end timeIMAGE_START_TIMEStringImage acquisition start timePROCESSING_RESULTStringGood, Fair, Poor, NGPROCESSING_UTStringProcessing timePRODUCT_FILENAMEStringSource filenamePRODUCT_VERSIONStringProduct versionSATELLITE_DIRECTIONStringSatellite orbit directionCHLA_AVE_OFFSETStringOffsetCHLA_AVE_SLOPEStringSlope

数据使用：

This dataset is free to use without any restrictions (including commercial use). Anyone wishing to publish analyzed results or value added data products should properly credit the original G-Portal data, e.g., "PR data by Japan Aerospace Exploration Agency". For value added data products, please indicate the credit of the original G-Portal data, e.g., "Original data for this value added data product was provided by Japan Aerospace Exploration Agency."

See G-Portal's terms of service (Article 7) for additional information.

引用：

Murakami, H. (Oct. 2018). ATBD of GCOM-C chlorophyll-a concentration algorithm (Version 1). Retrieved from https://suzaku.eorc.jaxa.jp/GCOM_C/data/ATBD/ver1/SGLI_Chla_algorithm_v10.pdf

代码：

var dataset = ee.ImageCollection("JAXA/GCOM-C/L3/OCEAN/CHLA/V2")

.filterDate('2020-01-01', '2020-02-01');

var image = dataset.mean().multiply(0.0016).log10();

var vis = {

bands: ['CHLA_AVE'],

min: -2,

max: 2,

palette: [

'3500a8','0800ba','003fd6',

'00aca9','77f800','ff8800',

'b30000','920000','880000'

]

};

Map.addLayer(image, vis, "Chlorophyll-a concentration");

Map.setCenter(128.45, 33.33, 5);

 

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