can you use pca without observation can pca be used without observations how does pa be used in soil surveys how to pca a dataset what variables can you use in grid analysis can you use pca in gis can pca be applied to a dataset when to use pca can pca be applied in grids without observations? does pca use observations can you use pca to predict sampling what is the use of pca can pca be applied on datasets without observations can pca be applied on an raster dataset how is pca used in mapping can pca be applied to grid data? can pca be applied to raster data what variables are used for pca can pca be applied on grid datasets without observations what is the difference between pca & dem