Google Earth Engine——城市群晝夜溫度資料集包含了全世界超過10,000個城市群的年度、夏季和冬季的地表熱島（SUHI）強度的晝夜變化。該産品既有像素級（降尺度後為300米分辨率）

YCEO Surface Urban Heat Islands: Pixel-Level Composites of Yearly Summertime Daytime and Nighttime Intensity

This dataset contains annual, summertime, and wintertime surface urban heat island (SUHI) intensities for day and night for over 10,000 urban clusters throughout the world. The dataset was created using the MODIS 8-day TERRA and AQUA land surface temperature (LST) products, the Landscan urban extent database, the Global Multi-resolution Terrain Elevation Data 2010, and the European Space Agency (ESA) Climate Change Initiative (CCI) land cover data using the Simplified Urban-Extent Algorithm. The product is available both at the pixel level (at 300 m resolution after downscaling) and as urban cluster means from 2003 to 2018. The monthly composites are only available as urban cluster means.

A summary of older versions, including changes from the dataset created and analyzed in the originally published manuscript can be found on the ​​Yale Center for Earth Observation website​​​. The dataset can also be explored using the ​​Global Surface UHI Explorer web application​​.

The dataset is split into the following six components:

1. UHI_all_averaged:Image containing cluster-mean composite daytime and nighttime SUHI intensity for annual, summer, and winter.
2. UHI_monthly_averaged:Image containing cluster-mean monthly composites of daytime and nighttime SUHI intensity.
3. UHI_yearly_averaged:Image collection of cluster-mean yearly composites of daytime and nighttime SUHI intensity from 2003. to 2018.
4. UHI_yearly_pixel:Image collection of spatially disaggregated (nominal scale of 300 m) annual daytime and nighttime SUHI intensity from 2003 to 2018.
5. Summer_UHI_yearly_pixel:Image collection of spatially disaggregated (nominal scale of 300 m) summertime daytime and nighttime SUHI intensity from 2003 to 2018.
6. Winter_UHI_yearly_pixel:Image collection of spatially disaggregated (nominal scale of 300 m) wintertime daytime and nighttime SUHI intensity from 2003 to 2018.

This asset is the fifth component.

該資料集包含了全世界超過10,000個城市群的年度、夏季和冬季的地表熱島（SUHI）強度的晝夜變化。該資料集使用MODIS 8天TERRA和AQUA地表溫度（LST）産品、Landscan城市範圍資料庫、2010年全球多分辨率地形高程資料以及歐洲航天局（ESA）氣候變化倡議（CCI）土地覆寫資料，使用簡化城市範圍算法建立。該産品既有像素級（降尺度後為300米分辨率），也有2003至2018年的城市群平均值。月度綜合資料隻提供城市群平均值。

在耶魯大學地球觀測中心的網站上可以找到舊版本的摘要，包括從最初發表的手稿中建立和分析的資料集的變化。該資料集也可以使用全球地表UHI Explorer網絡應用程式進行探索。

該資料集被分成以下六個部分。

UHI_all_averaged。圖檔包含全年、夏季和冬季的白天和夜間SUHI強度的群集平均值。

UHI_monthly_averaged: 包含日間和夜間SUHI強度的群集平均月度合成圖。

UHI_yearly_averaged: 2003年至2018年日間和夜間SUHI強度的群集平均年度合成圖像集。

UHI_yearly_pixel: 2003年至2018年日間和夜間SUHI強度的空間分類（标稱尺度為300米）圖像集。

夏天_UHI_yearly_pixel。2003年至2018年夏季白天和夜間SUHI強度的空間分類（标稱規模為300米）圖像集。

冬季_UHI_yearly_pixel。2003年至2018年冬季白天和夜間SUHI強度的空間分類（标稱比例為300米）圖像集。

這項資産是第五部分。

Dataset Availability

2003-01-01T00:00:00 - 2018-12-31T00:00:00

Dataset Provider

​​Yale Center for Earth Observation (YCEO)​​

Collection Snippet

​

​ee.ImageCollection("YALE/YCEO/UHI/Summer_UHI_yearly_pixel/v4")​

​

Resolution

300 meters

Bands Table

Name	Description	Units
Daytime	Daytime UHI	degree C
Nighttime	Nighttime UHI	degree C

引用：

Chakraborty, T., & Lee, X. (2019). A simplified urban-extent algorithm to characterize surface urban heat islands on a global scale and examine vegetation control on their spatiotemporal variability. International Journal of Applied Earth Observation and Geoinformation, 74, 269-280. ​​doi:10.1016/j.jag.2018.09.015​​

代碼：

var dataset = ee.ImageCollection("YALE/YCEO/UHI/Summer_UHI_yearly_pixel/v4");

var visualization = {
  bands: ['Daytime'],
  min: -1.5,
  max: 7.5,
  palette: [
    "#313695","#74add1","#fed976","#feb24c","#fd8d3c","#fc4e2a",
    "#e31a1c","#b10026",
  ]
};

Map.setCenter(-74.7, 40.6, 7);

Map.addLayer(dataset, visualization, "Daytime UHI");      

其他版本：

YALE_YCEO_UHI_UHI_all_averaged_v4

YCEO Surface Urban Heat Islands: Spatially-Averaged Daytime and Nighttime Intensity for Annual, Summer, and Winter

YALE_YCEO_UHI_UHI_monthly_averaged_v4

YCEO Surface Urban Heat Islands: Spatially-Averaged Monthly Composites of Daytime and Nighttime Intensity

YALE_YCEO_UHI_UHI_yearly_averaged_v4

YCEO Surface Urban Heat Islands: Pixel-Level Annual Daytime and Nighttime Intensity

YALE_YCEO_UHI_UHI_yearly_pixel_v4

YCEO Surface Urban Heat Islands: Pixel-Level Yearly Composites of Wintertime Daytime and Nighttime Intensity

YALE_YCEO_UHI_Winter_UHI_yearly_pixel_v4