Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"NDWI"”.
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Rivers Hydromorphological Characterization from High Resolution Remotely Sensed Data
… the mixed pixels. Optimal band analysis for NDWI (OBA-NDWI) is proposed to identify the pair of bands for which the NDWI values yield the highest correlation with water fractions. The OBA-NDWI then incorporates the optimal NDWI as a predictor of water fractions through a regression model. …
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Mapping the maize growth period using multi-temporal sentinel 1 and 2 imagery: a case study in Kasisi area of Chongwe district.
… and moisture changes in maize, while NDVI and NDWI indices from Sentinel-2 provided complementary vegetation and water condition metrics. These indices also enhanced a Random Forest classifier used for land cover classification. Field-validated training data supported the classification, which …
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Mapping the maize growth period using multi-temporal sentinel 1 and 2 imagery: a case study in Kasisi area of Chongwe district.
… and moisture changes in maize, while NDVI and NDWI indices from Sentinel-2 provided complementary vegetation and water condition metrics. These indices also enhanced a Random Forest classifier used for land cover classification. Field-validated training data supported the classification, which …
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Εκτίμηση της μετατόπισης του δασοορίου σε ορεινούς όγκους της Ελλάδας με χρονοσειρές πολυφασματικών δορυφορικών δεδομένων
… πολυφασματικών δεικτών NDVI, SAVI και NDWI από τους δορυφόρους Landsat (2000–2024) και Sentinel-2 (2018–2024).Η μεθοδολογική προσέγγιση περιέλαβε (α) φωτοερμηνεία πυκνότητας κόμης, (β) χαρτογράφηση του δασοορίου σε τρεις χρονικές τομές και (γ) αυτόματο εντοπισμό του δασοορίου με τον …
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Assessing the Effectiveness of Louisiana's Freshwater Diversion Projects Using Remote Sensing
… including NDVI, VI, IR/R, Sqrt IR/R, T-NDVI, and NDWI, as well as principle component analysis. The resulting enhanced images were classified into two classes, vegetation or open water. The ratios of vegetation to open water were then calculated and the changes graphed over the 1974-2006 …
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Remote sensing to characterise vegetation fuel moisture content in the UK uplands
… between the normalized difference water index (NDWI) and moisture stress index (MSI) with FMC, which was independent of scale. The relationship was not strongly affected by variations in soil background properties or differences in solar zenith angle. Spatial mapping of FMC across the Peak …
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Analysis of the surface hydrology of the Greenland Ice Sheet using Sentinel-1 Synthetic Aperture Radar
… relatively successful when compared to Landsat NDWI classification of supraglacial lakes. The lake detections are then utilised in a fully-automated rapid lake detection algorithm to investigate supraglacial lake dynamics through the summer (June to September). A total of 48 drainages were …
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An object-based image analysis approach for detecting urban impervious surfaces
… Index (NDVI), Normalized Difference Water Index (NDWI), and the Spectral Shape Index (SSI) was the best method, yielding a 91.41% classification accuracy. OBIA rule-based method 4 can be automated and generalized for multiple study areas. A test of the segmentation parameters show that parameter …
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Remote Sensing of Local Warming and Its Application Over Alberta
… generate high spatial resolution EVI, NDVI, and NDWI. Finally, long-term warming trend map is produced at 15m spatial resolution to represent the changes of temperature normals (i.e., 1961-2010 time period) as a final outcome. Results have demonstrated that the proposed methods of delineating …
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Determining primary drivers of river bead functionality in mountain headwater streams
… index (NDVI), normalized difference water index (NDWI), patch density, and total sinuosity. Driver and response variables were measured through a mixture of fieldwork and remote data for 52 beads in 27 catchments in the Colorado Front Range. Statistical analysis examined relationships between …
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Development of a Remote Sensing-Based Agriculture Monitoring Drought Index and Its Application Over Semi-Arid Region
… [i.e., normalized difference water index (NDWI), visible and shortwave drought index (VSDI), and land surface temperature (LST)]. Results showed that the proposed STI-FM was able to produce synthetic Landsat-8 data with strong accuracy (i.e., r2 were in the range 0.71 to 0.90). The …
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Application of remotely sensed environmental variables for predicting malaria cases in Nkomazi municipality South Africa
… factors such as Rainfall from TRMM, NDVI, EVI, NDWI and LST from both Landsat and MODIS are associated with malaria incidence. Furthermore, it was found that irrigation activities (agriculture) in the study is largely associated with malaria incidence. In addition, the study found that the …
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Remote sensing for detecting rapid post-fire recovery as Groundwater-Dependent Ecosystems in the Cape Floristic Region
… NDVI and Normalised Difference Wetness Index (NDWI) predictors and the potential wetland GDEs/non-wetland classes as the response. I tuned RF using five-fold repeated spatial cross-validation instead of the typical cross-validation tuning to account for the spatial structure of the data. The …
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Land-atmosphere exchange of carbon in a high-Arctic wet tundra ecosystem
Arctic ecosystems play a key role in the terrestrial carbon (C) cycle, but spa-tially explicit data on the C exchange is scarce in these remote areas. The global warming is especially dominant in the Arctic, and these areas are vul-nerable to climate change. It is therefore important to quantify …