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The National Elevation Dataset (NED) consists of high precision topography or ground surface elevation data (digital elevation model) for the United States. It was maintained by the USGS and all the data is in the public domain. Since the 3D Elevation Program came online, the NED was subsumed [1] into The National Map as one of its layers of ...
Bushy-tailed woodrat on midden Paleo-ecologists have used a variety of techniques to analyze the plant and animal material in pack rat middens describe paleo-communities and infer paleo-climate. For example, the plant species present in middens, and the carbon isotope ratios on material in middens have been widely studied.[7] " all depends on ...
This is a feasible strategy to avoid food shortage. It is the habit of collecting and storing both food and nonfood items that has earned the eastern woodrat is other common name of "pack-rat" or "trade rat". [17] Starting in September, the woodrat will start to forage and store food in its midden for use and survival in the winter. [18]
A pack rat midden is a debris pile constructed by a woodrat. A midden may preserve the materials incorporated into it for up to 50,000 years. [citation needed] These midden piles may be analyzed to reconstruct their original environment, and comparisons between middens allow a record of vegetative and climate change to be built.
USGS Land Cover Institute: Set of links from the USGS for numerous land cover datasets. Although primarily US data, further down the list there is data for other continents. Atlas of the Biosphere: Mapping the Biosphere: Raster maps of environmental variables including soil pH, potential evapotranspiration, average snow depth, and more.
The bushy-tailed woodrat, or packrat (Neotoma cinerea) is a species of rodent in the family Cricetidae found in Canada and the United States. [2] Its natural habitats are boreal forests , temperate forests, dry savanna , temperate shrubland , and temperate grassland .
Georeferenced map images are available from the USGS as digital raster graphics (DRGs) in addition to digital data sets based on USGS maps, notably digital line graphs (DLGs) and digital elevation models (DEMs). In 2015, the USGS unveiled the topoView website, a new way to view their entire digitized collection of over 178,000 maps from 1884 to ...
Midden is an old dump for domestic waste associated with past human occupation. Midden may also refer to: Packrat midden, a debris pile constructed by a woodrat; Privy midden, a toilet system that consisted of a privy associated with a midden (or middenstead) Dung midden, an animal toilet area or dunghill, also serving as a territorial marker