Google Earth Engine ——GCOM-C 進行長期和持續的全球陸地地表溫度資料集（JAXA/GCOM-C/L3/LAND/LST/V1）

本産品是陸地表面的溫度。 更新版本的 JAXA/GCOM-C/L3/LAND/LST/V2也可用于此資料集，該資料集使用此算法進行處理。 GCOM-C 進行長期和持續的全球觀測和資料收集，以闡明輻射收支和碳循環波動背後的機制，進而對未來溫度上升做出準确預測。同時，與有氣候數值模型的研究機構合作，有助于減少氣候數值模型得出的溫升預測誤差，提高各種環境變化的預測精度。安裝在 GCOM-C 上的 SGLI 是安裝在 ADEOS-II (MIDORI II) 上的 Global Imager (GLI) 的連續傳感器，是測量從近紫外到熱紅外區域 (380 nm-12 um) 的輻射的成像輻射計在 19 個頻道中。在日本附近的中緯度地區，地面觀測寬度超過 1,000 公裡，可以進行大約每兩天一次的全球觀測。此外，SGLI 實作了比同類全局傳感器更高的分辨率，并具有偏振觀測功能和多角度觀測功能。

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/LAND/LST/V1")

Resolution

2.5 arc minutes

Bands Table

Name	Description	Min*	Max*	Units
LST_AVE	Temperature of land surface.	65531	K
LST_QA_flag	LST QA
LST_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 

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
LST_AVE_OFFSET	String	Offset
LST_AVE_SLOPE	String	Slope

影像屬性：

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
LST_AVE_OFFSET	String	Offset
LST_AVE_SLOPE	String	Slope

資料說明：

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：

Moriyama, M. (Sep. 2014). GCOM–C1/SGLI Land Surface Temperature Product Algorithm Theoretical Basis Document (Version 1). Retrieved from https://suzaku.eorc.jaxa.jp/GCOM_C/data/ATBD/ver1/LST-ATBD_2014.pdf

代碼：

var dataset = ee.ImageCollection("JAXA/GCOM-C/L3/LAND/LST/V1")
                .filterDate('2020-01-01', '2020-02-01');

// Multiply with slope coefficient
var dataset = dataset.mean().multiply(0.02).log10();

var visualization = {
  bands: ['LST_AVE'],
  min: 2.4,
  max: 2.5,
  palette: [
    "040274","040281","0502a3","0502b8","0502ce","0502e6",
    "0602ff","235cb1","307ef3","269db1","30c8e2","32d3ef",
    "3be285","3ff38f","86e26f","3ae237","b5e22e","d6e21f",
    "fff705","ffd611","ffb613","ff8b13","ff6e08","ff500d",
    "ff0000","de0101","c21301","a71001","911003",
  ]
};

Map.setCenter(128.45, 33.33, 5);

Map.addLayer(dataset, visualization, "Land Surface Temperature");