VIIRS Stray Light Corrected Nighttime Day/Night Band Composites Version 1

NOAA/VIIRS/DNB/MONTHLY_V1/VCMSLCFG
Dataset Availability
2014-01-01T00:00:00 - Present
Dataset Provider
Earth Engine Snippet
ee.ImageCollection("NOAA/VIIRS/DNB/MONTHLY_V1/VCMSLCFG")
Tags
nighttime visible lights dnb noaa viirs eog monthly stray-light

Description

Monthly average radiance composite images using nighttime data from the Visible Infrared Imaging Radiometer Suite (VIIRS) Day/Night Band (DNB).

As these data are composited monthly, there are many areas of the globe where it is impossible to get good quality data coverage for that month. This can be due to cloud cover, especially in the tropical regions, or due to solar illumination, as happens toward the poles in their respective summer months. Therefore it is recommended that users of these data utilize the 'cf_cvg' band and not assume a value of zero in the average radiance image means that no lights were observed.

Cloud cover is determined using the VIIRS Cloud Mask product (VCM). In addition, data near the edges of the swath are not included in the composites (aggregation zones 29-32). Version 1 has NOT been filtered to screen out lights from aurora, fires, boats, and other temporal lights. This separation is under development and will be included in a later version of this time series. Also in development is a method to separate lights from background (non-light) values.

This product is an alternative configuration of the VIIRS DNB using a procedure to correct for stray light. The correction procedure extends visible areas closer to the poles and improves dynamic range. It should be noted some artifacts are introduced due to the procedure used in twilight regions; see reference paper for more details. This product excludes data impacted by cloud cover.

Product generated by the Earth Observation Group, NOAA National Geophysical Data Center.

Bands

Resolution
15 arc seconds

Bands

Name Units Min Max Description
avg_rad nanoWatts/cm2/sr -1.5* 193565*

Average DNB radiance values.

cf_cvg 0* 84*

Cloud-free coverages; the total number of observations that went into each pixel. This band can be used to identify areas with low numbers of observations where the quality is reduced.

* estimated min or max value

Terms of Use

Terms of Use

NOAA data, information, and products, regardless of the method of delivery, are not subject to copyright and carry no restrictions on their subsequent use by the public. Once obtained, they may be put to any lawful use. The forgoing data is in the public domain and is being provided without restriction on use and distribution.

Explore in Earth Engine

var dataset = ee.ImageCollection('NOAA/VIIRS/DNB/MONTHLY_V1/VCMSLCFG')
                  .filter(ee.Filter.date('2017-05-01', '2017-05-31'));
var nighttime = dataset.select('avg_rad');
var nighttimeVis = {min: 0.0, max: 60.0};
Map.setCenter(-77.1056, 38.8904, 8);
Map.addLayer(nighttime, nighttimeVis, 'Nighttime');