Related Experiment Video
Updated: Mar 8, 2026
09:44
Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon
Published on: October 16, 2018
10.8K
Multifractal Downscaling of Rainfall Using Normalized Difference Vegetation Index (NDVI) in the Andes Plateau
L A Duffaut Espinosa1, A N Posadas2,3, M Carbajal2
1Electrical and Biomedical Engineering Department, University of Vermont, Burlington, Vermont, United States of America.
Plos One
|January 27, 2017
Summary
This study estimates daily rainfall in the Peruvian Andes using Normalized Difference Vegetation Index (NDVI) data. The multifractal downscaling technique successfully generated daily rainfall estimates from satellite vegetation data.
Area of Science:
- Hydrology
- Remote Sensing
- Geospatial Analysis
Background:
- Accurate rainfall estimation is crucial for water resource management in high-altitude regions.
- Traditional meteorological data often lacks the spatial and temporal resolution needed for detailed hydrological studies.
- Satellite-derived vegetation indices offer a potential proxy for rainfall estimation.
Purpose of the Study:
- To develop and validate a temporal downscaling technique for estimating daily rainfall.
- To utilize Normalized Difference Vegetation Index (NDVI) data for rainfall estimation in the Peruvian Andean high plateau.
- To bridge the gap between irregular satellite data sampling and daily rainfall requirements.
Main Methods:
- Application of a multifractal downscaling technique.
- Transformation and lag correction of Normalized Difference Vegetation Index (NDVI) data.
- Temporal downscaling from 8-11 day intervals to daily estimates while maintaining ~1 km spatial resolution.
Main Results:
- Successful generation of daily rainfall estimates using the multifractal downscaling method.
- Validation of the downscaled rainfall estimates against on-site meteorological station data.
- Demonstration of the technique's efficacy in the Peruvian Andean high plateau.
Conclusions:
- Multifractal downscaling of NDVI is a viable method for estimating daily rainfall.
- The technique provides valuable high-resolution rainfall data for data-scarce regions.
- This approach enhances hydrological monitoring and water resource management in the Andes.
Related Concept Videos
01:12Precipitation Processes
6.4K
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
6.4K
01:17Precipitation and Co-precipitation
4.9K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
4.9K
01:03Precipitation Gravimetry
15.8K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
15.8K
01:20Downsampling
742
When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
742
02:41Responses to Drought and Flooding
12.3K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
12.3K