Jonathan M Friedman

Mean of the Top Ten Percent of NDVI Values in the Yuma Proving Ground during Monsoon Season, 1986-2011

This study uses growth in vegetation during the monsoon season measured from LANDSAT imagery as a proxy for measured rainfall. NDVI values from 26 years of pre- and post-monsoon season Landsat imagery were derived across Yuma Proving Ground (YPG) in southwestern Arizona, USA. The LANDSAT imagery (1986-2011) was downloaded from USGS’s GlobeVis website (http://glovis.usgs.gov/). Change in NDVI was calculated within a set of 2,843 Riparian Area Polygons (RAPs) up to 1 km in length defined in ESRI ArcMap 10.2.

Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Arizona, Landsat TM, NDVI, Normalized Difference Vegetation Index, Sonoran Desert, All tags... Southwestern United States, USGS Science Data Catalog (SDC), Yuma Proving Ground, biota, climatologyMeteorologyAtmosphere, ephemeral stream channels, monsoon season, Fewer tags

Elevation change in the watershed of Rito de los Frijoles, Bandelier National Monument, New Mexico from 2010 to 2016

Intense precipitation following the June 2011 Las Conchas Fire in the Jemez Mountains, New Mexico, led to widespread debris flows in the watershed of Rito de los Frijoles in Bandelier National Monument. Sediment eroded by these debris flows was transported along Rito de los Frijoles during floods in 2011 and 2013. This dataset contains two tabular files and one raster digital file. The tabular digital file Frijoles_Long_Profiles.csv contains longitudinal profiles of Rito de los Frijoles from 2010, before the fire, and 2016, after the debris flows and floods. These longitudinal profiles were derived from digital elevation models (DEMs) based on airborne lidar and present the elevation of the thalweg (deepest point...

Categories: Data; Tags: Bandelier National Monument, Ecology, Geography, New Mexico, USGS Science Data Catalog (SDC), All tags... erosion, fires, floods, inlandWaters, landslides, lidar, sediment transport, Fewer tags

Cottonwood Management at Theodore Roosevelt National Park, North Dakota

This data release consists of the following components: Sex ratio data from cottonwood trees at random points on the floodplain in the North and South units of Theodore Roosevelt National Park, ND. These data were used to investigate the effects of age, height above, and distance from the channel on mortality of male and female trees of plains cottonwood (Populus deltoides subsp. monilifera) as described in the Friedman and Griffin (2017) report. Tree core and tree ring data from the North and South Units of Theodore Roosevelt National Park, North Dakota. South Unit data was collected in April 2012, North Unit data was collected in the summer and fall of 2010. The trees are located on the floodplain of the Little...

Tags: Billings County, ND, Little Missouri River, McKenzie County, ND, North Dakota, Populus, All tags... Theodore Roosevelt National Park, USGS Science Data Catalog (SDC), United States, aerial imagery, cottonwood, dendrochronology, droughts, floods, floods, flow reconstruction, fluvial geomorphology, geomorphic mapping, mortality, remote sensing, riparian, riparian, sex ratio, stream channel, streamflow, vegetation, vegetation, Fewer tags

From flowering to foliage: Accelerometers track tree sway to provide high-resolution insights into tree phenology

Trees are bioindicators of global climate change and regional urbanization, but available monitoring tools are ineffective for fine-scale observation of many species. Using six accelerometers mounted on two urban ash trees (Fraxinus americana), we looked at high-frequency tree vibrations, or change in periodicity of tree sway as a proxy for mass changes, to infer seasonal patterns of flowering and foliage (phenophases). We compared accelerometer-estimated phenophases to those derived from digital repeat photography using Green Chromatic Coordinates (GCC) and visual observation of phenophases defined by the USA National Phenology Network (NPN). We also drew comparisons between two commercial accelerometers and assessed...

Categories: Publication; Types: Citation

Alternative standardization approaches to improving streamflow reconstructions with ring-width indices of riparian trees

Abstract (from http://hol.sagepub.com/content/early/2015/04/21/0959683615580181.abstract): Old, multi-aged populations of riparian trees provide an opportunity to improve reconstructions of streamflow. Here, ring widths of 394 plains cottonwood ( Populus deltoides, ssp. monilifera) trees in the North Unit of Theodore Roosevelt National Park, North Dakota, are used to reconstruct streamflow along the Little Missouri River (LMR), North Dakota, US. Different versions of the cottonwood chronology are developed by (1) age-curve standardization (ACS), using age-stratified samples and a single estimated curve of ring width against estimated ring age, and (2) time-curve standardization (TCS), using a subset of longer ring-width...

Categories: Publication; Types: Citation; Tags: Birds, Little Missouri River, National CASC, Science Tools for Managers, State of the Science, All tags... Water, Coasts and Ice, Wetlands, Wildlife and Plants, age growth, cottonwood, dendrohydrology, Fewer tags