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| Geografiskt viktad principalkomponentanalys (GWPCA)× | Geografiskt viktad slumpmässig skog× | |
|---|---|---|
| Ämnesområde | Rumslig analys | Rumslig analys |
| Familj | Machine learning | Machine learning |
| Ursprungsår≠ | 2011 | 2021 |
| Upphovsperson≠ | Paul Harris, Chris Brunsdon & Martin Charlton | Stefanos Georganos et al. |
| Typ≠ | Local dimensionality reduction | Spatially local ensemble learning method |
| Ursprungskälla≠ | Harris, P., Brunsdon, C., & Charlton, M. (2011). Geographically weighted principal components analysis. International Journal of Geographical Information Science, 25(10), 1717–1736. DOI ↗ | Georganos, S., et al. (2021). Geographical random forests: a spatial extension of the random forest algorithm. Geocarto International, 36(2), 121–136. link ↗ |
| Alias | Local PCA, Spatially Adaptive PCA, Geographically Weighted Factor Analysis, Yerel Coğrafi Ağırlıklı PCA | Geographical Random Forest, GRF, Spatial Random Forest, Cografi Agirlikli Rastgele Orman |
| Närliggande≠ | 2 | 3 |
| Sammanfattning≠ | Geographically Weighted Principal Component Analysis (GWPCA) is a local dimensionality-reduction method introduced by Harris, Brunsdon, and Charlton in 2011. It extends classical PCA by fitting a separate weighted PCA at every location in a dataset, allowing eigenstructures — the principal components and their loadings — to vary continuously across geographic space rather than being constrained to a single global solution. GWPCA is suited to researchers in environmental science, public health, and regional economics who suspect that multivariate relationships among variables differ by location. | Geographically Weighted Random Forest (GWRF) is a spatially local ensemble learning method that fits an independent Random Forest model at each observation location, weighting nearby training samples more heavily than distant ones through a spatial kernel function. It was introduced by Stefanos Georganos and colleagues in 2019 (published 2021) as an extension of Breiman's Random Forest to handle spatial non-stationarity — the phenomenon where predictor–response relationships vary across geographic space. |
| ScholarGateDatamängd ↗ |
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