统一的全球夜间灯光（1992-2020年）
在这项研究中，作者通过协调来自DMSP数据的相互校准的NTL观测值和来自VIIRS数据的模拟的类似DMSP的NTL观测值，在全球范围内生成了一个综合的、一致的NTL数据集。生成的全球DMSP NTL时间序列数据（1992-2018）显示出一致的时间趋势。这个时间上扩展的DMSP NTL数据集为与人类活动有关的各种研究提供了宝贵的支持，如电力消耗和城市范围动态。该数据集包含
1992-2013年经过时间校准的DMSP-OLS NTL时间序列数据；以及
从VIIRS数据中转换的NTL时间序列（2014-2020）。
空间分辨率：30角秒（约1公里）。
作者建议使用DN值大于7的像素。
来自国防气象卫星计划（DMSP）/作业线扫描系统（OLS）和苏米国家极轨合作卫星上的可见光红外成像辐射仪套件（VIIRS）的夜间光照（NTL）数据为监测从区域到全球范围的人类活动提供了一个巨大的机会。尽管DMSP（1992-2013年）和VIIRS（2012-2018年）提供了宝贵的夜景记录，但由于DMSP和VIIRS之间的严重不一致，NTL观测的历史档案的潜力还没有被充分挖掘出来。在这项研究中，我们通过协调来自DMSP数据的相互校准的NTL观测数据和来自VIIRS数据的模拟的类似DMSP的NTL观测数据，在全球范围内生成了一个综合的、一致的NTL数据集。生成的全球DMSP NTL时间序列数据（1992-2018）显示出一致的时间趋势。这个时间上扩展的DMSP NTL数据集为与人类活动有关的各种研究提供了宝贵的支持，如电力消耗和城市范围动态。
Harmonization of DMSP and VIIRS nighttime light data from 1992-2020 at the global scale
Data Citation¶
Paper Citation¶
Earth Engine Snippet¶
var dmsp = ee.ImageCollection("projects/sat-io/open-datasets/Harmonized_NTL/dmsp");
var viirs = ee.ImageCollection("projects/sat-io/open-datasets/Harmonized_NTL/viirs");
var dmsp = ee.ImageCollection("projects/sat-io/open-datasets/Harmonized_NTL/dmsp"),
viirs = ee.ImageCollection("projects/sat-io/open-datasets/Harmonized_NTL/viirs");
var viz = ["67001f","b2182b","d6604d","f4a582","fddbc7","ffffff","e0e0e0","bababa","878787","4d4d4d"].reverse()
Map.addLayer(dmsp.first(),{'min':50,'max':65,'palette':viz},'DMSP NTL 1992')
Map.addLayer(viirs.sort('system:time_start',false).first().updateMask(ee.Image(viirs.sort('system:time_start',false).first()).gte(50)),{'min':50,'max':65,'palette':viz},'Harmonized Simulated VIIRS NTL 2020')
var Dark
=
[
{
"featureType": "all",
"elementType": "labels",
"stylers": [
{
"visibility": "off"
}
]
},
{
"featureType": "all",
"elementType": "labels.text",
"stylers": [
{
"visibility": "off"
}
]
},
{
"featureType": "all",
"elementType": "labels.text.fill",
"stylers": [
{
"saturation": 36
},
{
"color": "#000000"
},
{
"lightness": 40
}
]
},
{
"featureType": "all",
"elementType": "labels.text.stroke",
"stylers": [
{
"visibility": "on"
},
{
"color": "#000000"
},
{
"lightness": 16
}
]
},
{
"featureType": "all",
"elementType": "labels.icon",
"stylers": [
{
"visibility": "off"
}
]
},
{
"featureType": "administrative",
"elementType": "geometry",
"stylers": [
{
"visibility": "on"
}
]
},
{
"featureType": "administrative",
"elementType": "geometry.fill",
"stylers": [
{
"color": "#000000"
},
{
"lightness": 20
}
]
},
{
"featureType": "administrative",
"elementType": "geometry.stroke",
"stylers": [
{
"color": "#000000"
},
{
"lightness": 17
},
{
"weight": 1.2
}
]
},
{
"featureType": "administrative",
"elementType": "labels",
"stylers": [
{
"visibility": "off"
}
]
},
{
"featureType": "administrative",
"elementType": "labels.text",
"stylers": [
{
"visibility": "off"
}
]
},
{
"featureType": "landscape",
"elementType": "geometry",
"stylers": [
{
"color": "#000000"
},
{
"lightness": 20
}
]
},
{
"featureType": "landscape",
"elementType": "labels.text",
"stylers": [
{
"visibility": "off"
}
]
},
{
"featureType": "poi",
"elementType": "geometry",
"stylers": [
{
"color": "#000000"
},
{
"lightness": 21
}
]
},
{
"featureType": "poi",
"elementType": "labels.text",
"stylers": [
{
"visibility": "off"
}
]
},
{
"featureType": "road",
"elementType": "geometry.fill",
"stylers": [
{
"visibility": "simplified"
},
{
"color": "#8a4040"
}
]
},
{
"featureType": "road",
"elementType": "geometry.stroke",
"stylers": [
{
"visibility": "on"
},
{
"color": "#ffffff"
}
]
},
{
"featureType": "road",
"elementType": "labels.text",
"stylers": [
{
"visibility": "off"
}
]
},
{
"featureType": "road.highway",
"elementType": "geometry.fill",
"stylers": [
{
"color": "#000000"
},
{
"lightness": 17
}
]
},
{
"featureType": "road.highway",
"elementType": "geometry.stroke",
"stylers": [
{
"color": "#000000"
},
{
"lightness": 29
},
{
"weight": 0.2
}
]
},
{
"featureType": "road.arterial",
"elementType": "geometry",
"stylers": [
{
"color": "#000000"
},
{
"lightness": 18
}
]
},
{
"featureType": "road.arterial",
"elementType": "geometry.fill",
"stylers": [
{
"color": "#ffffff"
},
{
"visibility": "on"
}
]
},
{
"featureType": "road.local",
"elementType": "geometry",
"stylers": [
{
"color": "#000000"
},
{
"lightness": 16
}
]
},
{
"featureType": "road.local",
"elementType": "geometry.fill",
"stylers": [
{
"visibility": "on"
},
{
"color": "#faf2f2"
}
]
},
{
"featureType": "transit",
"elementType": "geometry",
"stylers": [
{
"color": "#000000"
},
{
"lightness": 19
}
]
},
{
"featureType": "transit",
"elementType": "labels",
"stylers": [
{
"visibility": "off"
}
]
},
{
"featureType": "transit",
"elementType": "labels.text",
"stylers": [
{
"visibility": "off"
}
]
},
{
"featureType": "water",
"elementType": "geometry",
"stylers": [
{
"color": "#b4bcc2"
},
{
"lightness": 17
}
]
},
{
"featureType": "water",
"elementType": "labels",
"stylers": [
{
"visibility": "on"
}
]
},
{
"featureType": "water",
"elementType": "labels.text",
"stylers": [
{
"visibility": "off"
}
]
}
]
Map.setOptions('Dark', {Dark
: Dark
})
Sample Code: https://code.earthengine.google.com/?scriptPath=users/sat-io/awesome-gee-catalog-examples:global-utilities-assets-amenities/HARMONIZED-GLOBAL-NTL
License¶
This work is licensed under the Creative Commons Attribution 4.0 International License (Creative Commons — Attribution 4.0 International — CC BY 4.0 ). Users are free to use, copy, distribute, transmit, and adapt the work for commercial and non-commercial purposes, without restriction, as long as clear attribution of the source is provided.
Created by: Xuecao Li et al
Curated by: Samapriya Roy
Keywords: : DMSP/OLS data, VIIRS, nighttime light, calibration, consistent, global
Last updated: 2021-11-26
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