Assessing Water Availability in Mediterranean Regions Affected by Water Conflicts through MODIS Data Time Series Analysis
Abstract
:1. Introduction
- Time series of MODIS data (i.e., NDVI and LST) were compiled and used to compute their time series anomalies for temporal change detection. Current precipitation and reservoir storage time series anomalies were also computed.
- The correlation among time series anomalies was statistically assessed. Additionally, correlation images between reservoir storage and the spatial variables (NDVI, LST and current precipitation) were computed. The use of a land cover map, along with bibliographic references and the knowledge of the study area allowed the identification of areas and land uses that may influence the availability of water resources.
- Finally, spatial regression analysis was used to evaluate the potential of NDVI and LST time series as predictors of future precipitation changes by taking into account the spatial autocorrelation of the variables.
2. Materials and Methods
2.1. Remote-Sensing Images and Ancillary Geospatial Information
2.2. Climate and Reservoirs Storage Data
2.3. Statistical Methods
3. Results
3.1. Correlation between NDVI, LST and Precipitation
3.2. Time Series Anomalies Patterns
3.3. Spatial-Temporal Relationships between Reservoir Storage, Vegetation Greenness, LST and Precipitation
4. Discussion
4.1. Impacts of Predicted Precipitation Scenarios
4.2. Correlation between Time Series Anomalies of NDVI, LST, Precipitation and Water Reservoir Changes
4.3. Assessing Water Demands and Usage with MODIS Derived Products
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Variables | NDVI | Precipitation | LST | Reservoir Storage | |||||
---|---|---|---|---|---|---|---|---|---|
A-G | Am. | A-G | Am. | A-G | Am. | A-G | Am. | ||
NDVI | A-G | 1 | 0.956 ** | 0.103 | 0.125 | −0.376 | −0.473 | 0.565 * | 0.824 ** |
Am. | 0.956 ** | 1 | 0.165 | 0.196 | −0.305 | −0.433 | 0.565 * | 0.802 ** | |
Precipitation | A-G | 0.103 | 0.165 | 1 | 0.996 ** | 0.349 | 0.288 | 0.262 | 0.090 |
Am. | 0.125 | 0.196 | 0.996 ** | 1 | 0.323 | 0.257 | 0.310 | 0.143 | |
LST | A-G | −0.376 | −0.305 | 0.349 | 0.323 | 1 | 0.930 ** | −0.403 | −0.363 |
Am. | −0.473 | −0.433 | 0.288 | 0.257 | 0.930 ** | 1 | −0.370 | −0.367 | |
Reservoir storage | A-G | 0.565 * | 0.565 * | 0.262 | 0.310 | −0.403 | −0.370 | 1 | 0.843 ** |
Am. | 0.824 ** | 0.802 ** | 0.090 | 0.143 | −0.363 | −0.367 | 0.843 ** | 1 |
Precipitation Predictions | Adj. R2 | p-Value | Variables | Coefficient | Std. Error | p-Value | |
---|---|---|---|---|---|---|---|
Future precipitation predictions | RCP26 | 0.819 | <0.001 | Constant | 1006.885 | 25.508 | <0.001 |
Elevation | 0.043 | 0.005 | <0.001 | ||||
LST (mean 2001–2014) | −22.478 | 1.016 | <0.001 | ||||
RCP45 | 0.829 | <0.001 | Constant | 927.370 | 23.672 | <0.001 | |
Elevation | 0.049 | 0.005 | <0.001 | ||||
LST (mean 2001–2014) | −20.206 | 0.942 | <0.001 | ||||
RCP60 | 0.835 | <0.001 | Constant | 898.844 | 22.895 | <0.001 | |
Elevation | 0.051 | 0.005 | <0.001 | ||||
LST (mean 2001–2014) | −19.607 | 0.911 | <0.001 | ||||
RCP85 | 0.828 | <0.001 | Constant | 937.138 | 23.380 | <0.001 | |
Elevation | 0.045 | 0.005 | <0.001 | ||||
LST (mean 2001–2014) | −20.557 | 0.931 | <0.001 | ||||
Precipitation change (future prediction-present) | RCP26 | 0.722 | <0.001 | Constant | 70.006 | 4.533 | <0.001 |
Elevation | −0.214 | 0.007 | <0.001 | ||||
LST correlogram image | −42.773 | 4.093 | <0.001 | ||||
NDVI correlogram image | 57.910 | 5.863 | <0.001 | ||||
RCP45 | 0.725 | <0.001 | Constant | 47.297 | 4.610 | <0.001 | |
Elevation | −0.217 | 0.007 | <0.001 | ||||
LST correlogram image | −44.878 | 4.162 | <0.001 | ||||
NDVI correlogram image | 62.657 | 5.961 | <0.001 | ||||
RCP60 | 0.727 | <0.001 | Constant | 33.717 | 4.637 | <0.001 | |
Elevation | −0.219 | 0.007 | <0.001 | ||||
LST correlogram image | −45.595 | 4.187 | <0.001 | ||||
NDVI correlogram image | 64.455 | 5.997 | <0.001 | ||||
RCP85 | 0.731 | <0.001 | Constant | 48.234 | 4.587 | <0.001 | |
Elevation | −0.220 | 0.007 | <0.001 | ||||
LST correlogram image | −44.471 | 4.142 | <0.001 | ||||
NDVI correlogram image | 62.243 | 5.932 | <0.001 |
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Marco-Dos Santos, G.; Melendez-Pastor, I.; Navarro-Pedreño, J.; Koch, M. Assessing Water Availability in Mediterranean Regions Affected by Water Conflicts through MODIS Data Time Series Analysis. Remote Sens. 2019, 11, 1355. https://doi.org/10.3390/rs11111355
Marco-Dos Santos G, Melendez-Pastor I, Navarro-Pedreño J, Koch M. Assessing Water Availability in Mediterranean Regions Affected by Water Conflicts through MODIS Data Time Series Analysis. Remote Sensing. 2019; 11(11):1355. https://doi.org/10.3390/rs11111355
Chicago/Turabian StyleMarco-Dos Santos, Gema, Ignacio Melendez-Pastor, Jose Navarro-Pedreño, and Magaly Koch. 2019. "Assessing Water Availability in Mediterranean Regions Affected by Water Conflicts through MODIS Data Time Series Analysis" Remote Sensing 11, no. 11: 1355. https://doi.org/10.3390/rs11111355