Google Earth Engine ——GCOM-C 进行长期和持续的海表层浮游植物中绿色色素（叶绿素-a）的浓度。数据集（JAXA/GCOM-C/L3/OCEAN/CHLA/V2）

2024-05-24 08:57:34 浏览数 (3)
代码语言：javascript复制
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

Name

Description

Min*

Max*

Units

CHLA_AVE

Concentration of the green pigment (chlorophyll-a) in phytoplankton in sea surface layer.

0

4000

mg/m^3

CHLA_QA_flag

CHLA QA

CHLA_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%)

  • 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：

Name

Type

Description

ALGORITHM_VERSION

String

Algorithm version

GRID_INTERVAL

String

Spatial resolution

GRID_INTERVAL_UNIT

String

Unit of GRID_INTERVAL

IMAGE_END_TIME

String

Image acquisition end time

IMAGE_START_TIME

String

Image acquisition start time

PROCESSING_RESULT

String

Good, Fair, Poor, NG

PROCESSING_UT

String

Processing time

PRODUCT_FILENAME

String

Source filename

PRODUCT_VERSION

String

Product version

SATELLITE_DIRECTION

String

Satellite orbit direction

CHLA_AVE_OFFSET

String

Offset

CHLA_AVE_SLOPE

String

Slope

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：

代码语言：javascript复制
var dataset = ee.ImageCollection("JAXA/GCOM-C/L3/OCEAN/CHLA/V2")
                .filterDate('2020-01-01', '2020-02-01');

// Multiply with slope coefficient
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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