Research Geographer
Western Geographic Science Center
Email:
mvillarreal@usgs.gov
Office Phone:
650-439-2761
ORCID:
0000-0003-0720-1422
Supervisor:
Christopher E Soulard
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Polygon locations of fire perimeters in the Sky Island mountain ranges in the Madrean Archipelago Ecoregion of the southwestern United States and northern Mexico. These fires occurred from 1985 to 2011 and were mapped using Landsat satellite imagery.
Tags: Arizona, USA,
Chihuahua, Mexico,
Land Use Change,
Madrean Archipelago,
New Mexico, USA, All tags...
Remote Sensing,
Sonora, Mexico,
USGS Science Data Catalog (SDC),
biota,
burn mapping,
fire severity,
landsat,
remote sensing,
wildfire, Fewer tags
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Polygon locations of fire perimeters in the Sky Island mountain ranges in the Madrean Archipelago Ecoregion of the southwestern United States and northern Mexico. These fires occurred from 1985 to 2017 and were mapped using Landsat satellite imagery.
Tags: Arizona, USA,
Chihuahua, Mexico,
Ecology,
Forestry,
Geography, All tags...
Madrean Archipelago,
Madrean Archipelago,
Mexico,
New Mexico, USA,
Remote Sensing,
Sonora, Mexico,
US,
USGS,
USGS Science Data Catalog (SDC),
biota,
biota,
burn mapping,
remote sensing,
wildfire, Fewer tags
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Two UAS surveys were flown within the 2020 Glass fire extent designated as Glass 1 with 338 images and Glass 3 with 352. Both sites were flown at 50m AGL using a 3DR Solo with a Ricoh GR II in a nadir position. The imagery was processed in WebODM with the following parameters: mesh-octree-depth=13, orthophoto-resolution=1,pc-filter=0,pc-quality=ultra. An orthomosiac and height-above-ground (HAG) raster were derived from both photogrammetry projects. The raster data released herein is a selected area of interest from both study sites. The point clouds are the full, raw dense-clouds; the centroids point file is a collection of hand digitized locations of the in-situ plots from each study site; and the csv is the observed...
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To determine if invasive annual grasses increased around energy developments after the construction phase, we calculated an invasives index using Landsat TM and ETM+ imagery for a 34-year time period (1985-2018) and assessed trends for 1,755 wind turbines (from the U.S. Wind Turbine Database) installed between 1988 and 2013 in the southern California desert. The index uses the maximum normalized difference vegetation index (NDVI) for early season greenness (January-June), and mean NDVI (July-October) for the later dry season. We estimated the relative cover of invasive annuals each year at turbine locations and control sites and tested for changes before and after each turbine was installed. These data were used...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service,
Shapefile;
Tags: California,
California South,
Google Earth Engine,
Landsat,
Normalized Difference Vegetation Index, All tags...
USGS Science Data Catalog (SDC),
desert ecosystems,
ecology,
energy development,
energy resources,
grassland ecosystems,
grasslands,
invasive species,
nonindigenous species,
time series,
vegetation,
wind energy, Fewer tags
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Annual (1986-2020) land-use/land cover maps at 30-meter resolution of the Tucson metropolitan area, Arizona and the greater Santa Cruz Watershed including Nogales, Sonora, Mexico. Maps were created using a combination of Landsat imagery, derived transformation and indices, texture analysis and other ancillary data fed to a Random Forest classifier in Google Earth Engine. The maps contain 13 classes based on the National Land Cover Classification scheme and modified to reflect local land cover types. Data are presented as a stacked, multi-band raster with one "band" for each year (Band 1 = 1986, Band 2 = 1987 and so on). Note that the year 2012 was left out of our time series because of lack of quality Landsat data....
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