Filters: Tags: Mojave Desert (X) > Extensions: Shapefile (X)

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Electrical Resistivity Tomography Data at Edwards Air Force Research Laboratory, Antelope Valley, California, 2018 Electrical resistivity tomography (ERT) surveys were done northwest of the Air Force Research Laboratory (AFRL) at Edwards Air Force Base. ERT surveys were done at four locations in May through June of 2018 to refine the understanding of the bedrock-alluvial aquifer transition zone downgradient from the AFRL. The ERT technique injects direct-current electricity with known voltage and current into the earth using a series of electrodes and measures the resulting resistivity. This technique is generally limited to investigations of aquifer properties less than 100 meters below land surface. Data from other geophysical techniques co-located with the ERT data, including time-domain electromagnetics and horizontal-to-vertical... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Antelope-Fremont Valleys, Boron, California, California Water Science Center, Edwards Air Force Base, All tags... Electrical Resistivity Tomography, Leuhman Ridge, Mojave Desert, North Edwards, bedrock geologic units, environment, geophysics, geoscientificInformation, groundwater, hydrologic processes, water resources, Fewer tags Ground-Based Time-Domain Electromagnetic Data Collected at Edwards Air Force Research Laboratory, Antelope Valley, California, 2018 Time-domain electromagnetic (TEM) surveys were done northwest of the Air Force Research Laboratory (AFRL) at Edwards Air Force Base. TEM surveys were done at 33 locations between May and October 2018 to refine the understanding of the bedrock-alluvial aquifer transition zone downgradient from the AFRL. TEM surveys (also called transient electromagnetic surveys) provide 1D resistivity soundings of the subsurface, which can be related to lithology and hydrogeology. In the TEM method, electrical current is cycled through a transmitter loop (Tx) wire, which in turn produces a primary magnetic field. When the current is abruptly terminated, a secondary magnetic field is induced in the earth, and it moves downward and... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Antelope-Fremont Valleys, Boron, California, Edwards Air Force Base, Kern County, All tags... Leuhman Ridge, Mojave Desert, North Edwards, electrical resistivity tomography, environment, geophysics, geophysics, geoscientificInformation, measurement, time domain electromagnetic, transient electromagnetic, Fewer tags Invasive Plant Cover in the Mojave Desert, 2009 - 2013 (ver. 2.0, April 2021) We assessed the impacts of co-occurring invasive plant species on fire regimes and postfire native communities in the Mojave Desert, western USA by analyzing the distribution and co-occurrence patterns of three invasive annual grasses known to alter fuel conditions and community structure: Red Brome (Bromus rubens), Cheatgrass (Bromus tectorum), and Mediterranean grass (Schismus spp.: Schismus arabicus and Schismus barbatus), and an invasive forb, red stemmed filaree (Erodium cicutarium) which can dominate postfire sites. We developed species distribution models (SDMs) for each of the four taxa and analyzed field plot data to assess the relationship between invasives and fire frequency, years postfire, and the impacts... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Mojave desert, USGS Science Data Catalog (SDC), biota, co-occurance invasives, desert ecosystems, All tags... ecosystems, field methods, fire disturbance, fire frequency, fires, geographic information systems, habitat alteration, invasive species, plants (organisms), remote sensing, vegetation, Fewer tags Central Mojave Desert Vegetation Mapping Project, California, 1997-1999: Special Features Points The Central Mojave Special Features shapefile provides point locations for known or potential places where vegetation alliances or unique stands occurred (from 1997-1999) with less than 5 hectares of spatial extent. These designations were provided separately from the Mojave Vegetation Polygons because the target standard for the polygons was a minimum mapping unit (MMU) of 5 hectares, thus methods used at the time to assign labels precluded mapping these special features as polygons. The special features points are still included because it is important to note the known or potential location of vegetation alliances for future mapping at finer spatial resolution. The metadata record (Mojave-Vegetation-Mapping_Special-Features-Points-Metadata.xml)... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: California, California plants, California vegetation, China Lake Naval Weapons Center, Death Valley National Park, All tags... Desert southwest, Ft. Irwin Military Reservation, Marine Corps Air Ground Combat Center, Mojave Desert, Mojave National Preserve, Mojave plants, Mojave vegetation, National Vegetation Classification, North America, United States, arid lands, biota, southern California, special features, vegetation, vegetation alliances, Fewer tags Ecoregion sections of California deserts The dataset delineates ecological sections within California deserts. These deserts occupy the southeastern portion of California and include two ecoregional provinces comprised of five desert regions ("ecological sections"; Miles and Goudey 1997). The American Semi-Desert and Desert Province (warm deserts) includes the Mojave Desert, Sonoran Desert, and Colorado Desert sections in the southern 83% of the California desert. The Intermountain Semi-Desert Province (cold deserts) includes the Southeastern Great Basin and Mono sections in the northern 17% of the region. Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: California, Colorado Desert, Great Basin, Mojave Desert, Mono, All tags... Sonoran Desert, deserts, wildfire regimes, Fewer tags Central Mojave Desert Vegetation Mapping Project, California, 1997-1999: Mojave Vegetation Polygons The Central Mojave Vegetation Polygons shapefile represents areas of the Mojave Desert classified into vegetation classes or alliances representative of the area from 1997-1999. The classification of these areas were derived from context gathered in the field data, photographs and additional satellite imagery that is not included in this data release. The original map coverage was preserved and released as a shapefile (mojave_veg_polygons.shp). In contrast to the Special Features Points vegetation classifications (described in the Special Features Points shapefile metadata record and ScienceBase item), the Central Mojave Vegetation Polygons were designated by vegetation alliances that extended 5 hectares or more.... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: California, California plants, California vegetation, China Lake Naval Weapons Center, Death Valley National Park, All tags... Desert southwest, Ft. Irwin Military Reservation, Marine Corps Air Ground Combat Center, Mojave Desert, Mojave National Preserve, Mojave plants, Mojave vegetation, National Vegetation Classification, North America, United States, arid lands, biota, southern California, special features, vegetation, vegetation alliances, Fewer tags Electrical Resistivity Tomography Data at Fort Irwin National Training Center, San Bernardino County, California, 2015 and 2017 The U.S. Army Fort Irwin National Training Center (NTC), approximately 35 mi north-northeast of Barstow, California, covers approximately 1,177 square miles, and is comprised of ten groundwater basins, three of which have been subdivided into subbasins on the basis of additional hydrologic testing. Since the early 1990s, the U.S. Geological Survey (USGS) has been studying water resources issues at Fort Irwin. One issue of concern is the potential effect of groundwater development resulting from planned training expansion and infrastructure at the NTC on natural springs and seeps, an important water source for wildlife. In 2010, the USGS entered into cooperative agreements with the U.S. Army to complete studies of... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Bicycle Lake, CAWSC, California, California Water Science Center, Electrical Resistivity Tomography, All tags... Fort Irwin, GGGSC, Geology, Geophysics, and Geochemistry Science Center, Geophysics, Hydrogeology, Mojave, Mojave Desert, San Bernardino County, USGS Science Data Catalog (SDC), desert ecosystems, environment, geophysics, geoscientificInformation, groundwater, hydrologic processes, lakebed characteristics, resistivity, water resources, Fewer tags Central Mojave Desert Vegetation Mapping Project, California, 1997-1999: Plots Points and Photographs The Mojave Plots Points data are 1,219 plot locations in the Central Mojave Desert where field data were recorded and photographs were taken from 1997-1999 to provide context for the classification of the Central Mojave Desert into various vegetation classes. The 1,219 plot locations in the plots points shapefile (plots_points.shp) are each assigned a unique identifier called the FinalPlotCode. The FinalPlotCode can be used to match the shapefile points to the Mojave Field Data. The attached CSV file (Mojave_Images_Crosswalk.csv) can be used to relate the FinalPlotCodes to the associated photographs that are attached as zipped TIFF images to the ScienceBase page. There are 1,695 total photographs available that... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: California, California plants, California vegetation, China Lake Naval Weapons Center, Death Valley National Park, All tags... Desert southwest, Ft. Irwin Military Reservation, Marine Corps Air Ground Combat Center, Mojave Desert, Mojave National Preserve, Mojave plants, Mojave vegetation, National Vegetation Classification, North America, United States, arid lands, biota, southern California, special features, vegetation, vegetation alliances, Fewer tags Mojave Desert Ecoregion This is a shapefile of the Mojave Desert, which was used as our study area boundary (MojaveEcoregion_TNS_UTM83.shp). Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Mojave Desert, biota, burn severity, co-occurence invasives, desert ecosystems, All tags... ecosystems, environmental gradients, field methods, fire disturbance, fire frequency, fires, geographic gradients, geographic information systems, grass-fire cycle, ignition, imageryBaseMapsEarthCover, invasive plant species, invasive species, machine learning, maximum entropy, plants (organisms), random forests, remote sensing, spatial dynamics, vegetation, Fewer tags