DMSP-OLS Radiance Calibrated Nighttime Lights Time Series with Intercalibration
Abstract
:1. Introduction
2. Methodology
2.1. Preparation of Fixed-Gain Imagery Collection
2.1.1. Instrument Gain
Representative Satellite/Year | Fixed-Gain | Satellite/Period of Observation |
---|---|---|
F12_1997 | 24 | F12/19960316–19960324 |
F12/19970105–19970212 | ||
40 | F12/19960316–19960324 | |
50 (b) | F12/19970105–19970212 | |
STB* | F12/1997 | |
F12_1999 | 15 | F12/19990119–19991211 |
35 | F12/19990119–19991211 | |
55 (b) | F12/19990119–19991211 | |
STB | F14/1999 | |
F12_2000 | 15 | F12/20000103–20001229 |
F15/20000303–20000508 | ||
35 | F12/20000103–20001229 | |
F15/20000303–20000508 | ||
55 (b) | F12/20000103–20001229 | |
F15/20000303–20000508 | ||
STB | F15/2000 | |
F14_2003 | 15 | F14/20021230–20031127 |
F15/20021230–20030205 | ||
35 | F14/20021230–20031127 | |
F15/20021230–20030205 | ||
55 (b) | F14/20021230–20031127 | |
F15/20021230–20030205 | ||
STB | F15/2003 | |
F14_2004 | 15 | F14/20040118–20041216 |
35 | F14/20040118–20041216 | |
55 (b) | F14/20040118–20041216 | |
STB | F15/2004 | |
F16_2006 | 15 | F16/20051128–20061224 |
35 | F16/20051128–20061224 | |
55 (b) | F16/20051128–20061224 | |
STB | F16/2006 | |
F16_2010 | 15 | F16/20100111–20101209 |
F16/20110129–20110731 | ||
35 | F16/20100111–20101209 | |
F16/20110129–20110731 | ||
50 (b) | F16/20100111–20101209 | |
F16/20110129–20110731 | ||
STB | F18/2010 |
2.1.2. Data Processing
Flag Name | Indication | Prefer State |
---|---|---|
DAYTIME | Area of projected pixel is in daytime. | OFF |
NIGHTTIME MARGINAL | Area of projected pixel is in transition zone between daytime and nighttime. | OFF |
ZERO LUNAR ILLUMINANCE | Area of projected pixel is not affected by lunar illumination. | ON |
CLOUDS PRESENT | Area of projected pixel is covered by clouds. | OFF |
NO DATA | The pixel does not contain valid data in OLS imagery. | OFF |
2.2. Merge Fixed-Gain Data
2.2.1. Pre-Processing
2.2.2. Merge Process
2.3. Blend Stable Lights Product
2.4. Intercalibration
2.4.1. Inter-Satellite Calibration
Satellite | Base Gain (dB) | Multiplier | Radiance @ DN1 (W/cm2/sr) |
---|---|---|---|
F12 | 55 | 0.96 | 1.44E-10 |
F14 | 55 | 0.82 | 1.23E-10 |
F15 | 55 | 0.90 | 1.35E-10 |
F16 | 55 | 1.00 | 1.50E-10 |
2.4.2. Inter-Annual Calibration
Satellite_Year | Slope (a) | Intercept (b) | R2 | Number of Pixels * |
---|---|---|---|---|
F12_19960316–19970212 | 0.915 | 4.336 | 0.971 | 20,540 |
F12_19990119–19991211 | 0.780 | 1.423 | 0.980 | 20,846 |
F12-F15_20000103–20001229 | 0.710 | 3.658 | 0.980 | 20,866 |
F14-F15_20021230–20031127 | 0.797 | 3.736 | 0.980 | 20,733 |
F14_20040118–20041216 | 0.761 | 1.062 | 0.984 | 20,848 |
F16_20051128–20061224 | 1.000 | 0.000 | 1.000 | 21,044 |
F16_20100111–20101209 | 1.195 | 2.196 | 0.981 | 20,848 |
F16_20100111–20110731 | 1.246 | −1.987 | 0.981 | 20,848 |
2.4.3. Verifying the Effect of Inter-Annual Calibration
3. Applications
3.1. Restriction on Converting DN to Radiance
3.2. Comparing Radiance Calibrated Product with Stable Lights Product
4. Conclusion and Discussion
Acknowledgment
Author Contributions
Conflicts of Interest
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Hsu, F.-C.; Baugh, K.E.; Ghosh, T.; Zhizhin, M.; Elvidge, C.D. DMSP-OLS Radiance Calibrated Nighttime Lights Time Series with Intercalibration. Remote Sens. 2015, 7, 1855-1876. https://doi.org/10.3390/rs70201855
Hsu F-C, Baugh KE, Ghosh T, Zhizhin M, Elvidge CD. DMSP-OLS Radiance Calibrated Nighttime Lights Time Series with Intercalibration. Remote Sensing. 2015; 7(2):1855-1876. https://doi.org/10.3390/rs70201855
Chicago/Turabian StyleHsu, Feng-Chi, Kimberly E. Baugh, Tilottama Ghosh, Mikhail Zhizhin, and Christopher D. Elvidge. 2015. "DMSP-OLS Radiance Calibrated Nighttime Lights Time Series with Intercalibration" Remote Sensing 7, no. 2: 1855-1876. https://doi.org/10.3390/rs70201855