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Keyword: PCA

Biological reserves of the US Federal Protection Network (IUCN categories I-IV) and PCA loadings used to characterize the climate space of the conterminous United States

Datasets Posted on: August 27, 2015
This data publication contains a map of biological reserves, in the conterminous United States (US), larger than 500 hectares managed by four US federal agencies: Bureau of Land Management (BLM), Fishand Wildlife Service (FWS), Forest Service (FS), and National Parks Service (NPS).

Empirical modeling of spatial and temporal variation in warm season nocturnal air temperatures in two North Idaho mountain ranges, USA

Publications Posted on: October 05, 2011
Accurate, fine spatial resolution predictions of surface air temperatures are critical for understanding many hydrologic and ecological processes. This study examines the spatial and temporal variability in nocturnal air temperatures across a mountainous region of Northern Idaho. Principal components analysis (PCA) was applied to a network of 70 Hobo temperature loggers systematically distributed across 2 mountain ranges.

Empirical downscaling of daily minimum air temperature at very fine resolutions in complex terrain

Publications Posted on: June 22, 2011
Available air temperature models do not adequately account for the influence of terrain on nocturnal air temperatures. An empirical model for night time air temperatures was developed using a network of one hundred and forty inexpensive temperature sensors deployed across the Bitterroot National Forest, Montana.

Fire scar mapping in a southern African savanna

Publications Posted on: September 10, 2007
Multitemporal principal components analyses (PCAs) of pre- and post-burn Landsat Thematic Mapper images were used to map fire scars in Madikwe Game Reserve (MGR), South Africa. Prior to MGR's inception in 1991, when the land was used for extensive cattle ranching, overgrazing and fire suppression lead to bush encroachment. Fire is currently being used to control bush encroachment.