Google Earth engine (GEE) - gcom-c / Sgli L3 chlorophyll-a concentration (V3) data set (5000

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problem ： Blogger, may I ask ocean color How to get the ocean chlorophyll data ？

I really don't understand this , But through this question , I searched for you GEE Chlorophyll data set on

The product is a photosynthetic pigment in phytoplankton on the surface of the sea （ chlorophyll -a） The concentration of .

This is a continuous data set , Delay for 3-4 God .

GCOM-C Long term and continuous global observation and data collection , To elucidate the mechanism behind radiation budget and carbon cycle fluctuations , This is what is needed to make an accurate prediction of future temperature rise . meanwhile , Cooperate with research institutions with numerical climate models , It helps to reduce the temperature rise prediction error caused by the climate numerical model , Improve the prediction accuracy of various environmental changes . Installed in the GCOM-C Upper SGLI Is installed in ADEOS-II (MIDORI II) Upper Global Imager (GLI) The successor sensor , It is used to measure the range from near ultraviolet to thermal infrared (380 nm-12 um) The radiation of the imaging radiometer in 19 Of channels . In the middle latitudes near Japan , By being larger than on the ground 1,000 The observation width of kilometers , Global observations can be made about every two days . Besides ,SGLI It achieves higher resolution than similar global sensors , It also has polarizing observation function and multi angle observation function .

Dataset availability

2021-11-29T00:00:00Z - 2022-06-09T00:00:00

Data set provider

Global change observation mission (GCOM)

Earth engine fragment

ee.ImageCollection("JAXA/GCOM-C/L3/OCEAN/CHLA/V3") 

Dataset Availability

2021-11-29T00:00:00 -

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

Dataset Availability

2018-01-01T00:00:00 - 2021-11-28T00:00:00

ee.ImageCollection("JAXA/GCOM-C/L3/OCEAN/CHLA/V1") 

Dataset Availability

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

Band ：

The resolution of the
4638.3 rice

Band

full name	Company	Sensitive	maximum	describe
CHLA_AVE	mg / rice ^3	0*	4000*	Green pigments in phytoplankton on the surface of the sea （ chlorophyll -a） The concentration of .
CHLA_QA_flag				QA
CHLA_QA_flag Bit mask for

* Estimated minimum or maximum value

Image properties

full name	type	describe
ALGORITHM_VERSION	String	Algorithm version
GRID_INTERVAL	String	Spatial resolution
GRID_INTERVAL_UNIT	String	GRID_INTERVAL The unit of
IMAGE_END_TIME	String	End time of image acquisition
IMAGE_START_TIME	String	Image acquisition start time
PROCESSING_RESULT	String	good 、 commonly 、 Bad 、NG
PROCESSING_UT	String	The processing time
PRODUCT_FILENAME	String	The source file name
PRODUCT_VERSION	String	product version
SATELLITE_DIRECTION	String	Satellite orbit direction A： Night data D： Daytime data
CHLA_AVE_OFFSET	String	offset
CHLA_AVE_SLOPE	String	slope

Terms of use

This data set can be used for free , No restrictions （ Including commercial use ）. Anyone wishing to publish analysis results or value-added data products should correctly indicate the original G-Portal data , for example “ JAXA PR data ”. For value-added data products , Please indicate the original G-Portal Source of data , for example “ The original data of the value-added data product is provided by JAXA ”.

For more information , see also G-Portal Terms of service （ The first 7 strip ） .

 

Citations:

• Murakami, H. (Jan. 2020). ATBD of GCOM-C chlorophyll-a concentration algorithm (Version 2). Retrieved from https://suzaku.eorc.jaxa.jp/GCOM_C/data/ATBD/ver2/V2ATBD_O3AB_Chla_Murakami.pdf

  Code ：

var dataset = ee.ImageCollection("JAXA/GCOM-C/L3/OCEAN/CHLA/V3")                .filterDate('2021-12-01', '2022-01-01')                // filter to daytime data only                .filter(ee.Filter.eq("SATELLITE_DIRECTION", "D"));// Multiply with slope coefficientvar 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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