The confluence of the Sacramento River and San Joaquin River (CA) undergoes considerable intra-annual changes in surface water inundation. The example illustrates the difference between maximum 2017 inundation (January-March) to lower levels of inundation towards the end of the calendar year.
Christopher Soulard
Chris Soulard has worked for the U.S. Geological Survey since 2002. He is currently a supervisory research geographer working with the Western Geographic Science Center in Moffett Field, CA.
I started my career with the U.S. Geological Survey in 2002 as a student intern and have never looked back, fully embracing my role as a civil servant. For over 20 years, I have had the fortune to work on a wide range of remote sensing into projects focusing on multi-temporal change analyses using Landsat imagery and aerial photography, most notably the Land Cover Trends Project. I have also had many opportunities to expand my research scope, including community vulnerability assessments of tsunami and volcanic lahar hazards in the Pacific Northwest, terrestrial laser scanning to monitor soil and vegetation changes in the Mojave Desert and elsewhere, land-use/land-cover forecasting for the Western United States, and vegetation change analyses using Google Earth Engine cloud computing. My career with the U.S. Geological Survey has afforded me the chance to develop technical geospatial and geostatistical research expertise, as well as soft skills like project management, leadership, and communication. I currently serve as the Principal Investigator of the PLACE Project (Patterns in the Landscape – Analyses of Cause and Effect) and supervise the Ecosystem Dynamics Team.
Science and Products
Volcanoes
As the 1980 Mount St. Helens eruption showed, volcanoes pose significant threats to U.S. communities. Potential hazards posed by U.S. volcanoes include tephra falls, pyroclastic flows and surges, VOG, ballistic projectiles, lahar and lava flows. In collaboration with researchers from the USGS Volcano Hazards Program, the Hazards Vulnerability Team worked on better understanding and communicating...
Identifying Historical Drivers of Vegetation Change to Inform Future Management of Federal Lands in the Northern Great Basin
The sagebrush rangelands of the Great Basin provide crucial habitat for a diversity of wildlife, including the pronghorn and the greater sage-grouse. These water-limited, highly-managed ecosystems have already been degraded by wildfires, the expansion of invasive grasses, and livestock grazing, and are expected to experience additional stress as climate and land use conditions change...
Web Mapping Application for a Historical Geologic Field Photo Collection
Geotagged photographs have become a useful medium for recording, analyzing, and communicating Earth science phenomena. Despite their utility, many field photographs are not published or preserved in a spatial or accessible format—oftentimes because of confusion about photograph metadata, a lack of stability, or user customization in free photo sharing platforms. After receiving a request...
Patterns in the Landscape – Analyses of Cause and Effect
Understanding the rates and causes of land-use/land-cover (LULC) change helps answer questions about what, where, how, and why the Earth’s surface is changing. Land-surface change results from human activities or natural processes like floods, droughts, and wildfires, and many of these change processes are observable in satellite imagery. The growing historical catalog of satellite images allows...
Land Cover Trends
Land Cover Trends was a research project focused on understanding the rates, trends, causes, and consequences of contemporary U.S. land use and land cover change. The project spanned from 1999 to 2011. The research was supported by the Climate and Land Use Change Research and Development Program of the U.S. Geological Survey (USGS) and was a collaborative effort with the U.S. Environmental...
Integration of Land Cover Trends Field Photography with an Online Map Service
The USGS National Land Cover Trends Project has the largest repository of field photos at the USGS (over 33,000 photos). Prior to CDI funding, Land Cover Trends had limited funding to make the national collection of photos available online for researchers, land managers, and citizens. The goal of this CDI project was to add geotags and keywords to the digital copies of each field photo...
Assessing the Vulnerability of Dryland Ecosystems to Drought in the Western U.S.
In the western U.S., rising temperatures and pronounced drought conditions pose significant challenges to public land managers. Widespread declines of multiple plant species have already been observed, providing insight into what the future could look like for vegetation in the region as conditions are projected to become warmer and drier. To understand how vulnerable western ecosystems...
Linking Extreme Storms to Changes in Precipitation, Ecosystems, and Wildfire Patterns in the Sierra Nevada
The majority of the West Coast’s most extreme storms have been linked to atmospheric rivers, a meteorological phenomenon in which large amounts of moisture are carried in narrow bands from over the Pacific Ocean to western North America. While weak atmospheric rivers are critical providers of winter rain and snow, stronger events can cause extreme flooding, mudslides, and avalanches –...
Maximum and Minimum Inundation for the Confluence of the Sacramento and San Joaquin Rivers
The confluence of the Sacramento River and San Joaquin River (CA) undergoes considerable intra-annual changes in surface water inundation. The example illustrates the difference between maximum 2017 inundation (January-March) to lower levels of inundation towards the end of the calendar year.
South Lake Tahoe June 2016
High confidence DSWEmod water pixels (blue) from June 2016 covering South Lake Tahoe overlaid on top of a 2016 USDA NAIP image.
High confidence DSWEmod water pixels (blue) from June 2016 covering South Lake Tahoe overlaid on top of a 2016 USDA NAIP image.
Science and Products
Volcanoes
As the 1980 Mount St. Helens eruption showed, volcanoes pose significant threats to U.S. communities. Potential hazards posed by U.S. volcanoes include tephra falls, pyroclastic flows and surges, VOG, ballistic projectiles, lahar and lava flows. In collaboration with researchers from the USGS Volcano Hazards Program, the Hazards Vulnerability Team worked on better understanding and communicating...
Identifying Historical Drivers of Vegetation Change to Inform Future Management of Federal Lands in the Northern Great Basin
The sagebrush rangelands of the Great Basin provide crucial habitat for a diversity of wildlife, including the pronghorn and the greater sage-grouse. These water-limited, highly-managed ecosystems have already been degraded by wildfires, the expansion of invasive grasses, and livestock grazing, and are expected to experience additional stress as climate and land use conditions change...
Web Mapping Application for a Historical Geologic Field Photo Collection
Geotagged photographs have become a useful medium for recording, analyzing, and communicating Earth science phenomena. Despite their utility, many field photographs are not published or preserved in a spatial or accessible format—oftentimes because of confusion about photograph metadata, a lack of stability, or user customization in free photo sharing platforms. After receiving a request...
Patterns in the Landscape – Analyses of Cause and Effect
Understanding the rates and causes of land-use/land-cover (LULC) change helps answer questions about what, where, how, and why the Earth’s surface is changing. Land-surface change results from human activities or natural processes like floods, droughts, and wildfires, and many of these change processes are observable in satellite imagery. The growing historical catalog of satellite images allows...
Land Cover Trends
Land Cover Trends was a research project focused on understanding the rates, trends, causes, and consequences of contemporary U.S. land use and land cover change. The project spanned from 1999 to 2011. The research was supported by the Climate and Land Use Change Research and Development Program of the U.S. Geological Survey (USGS) and was a collaborative effort with the U.S. Environmental...
Integration of Land Cover Trends Field Photography with an Online Map Service
The USGS National Land Cover Trends Project has the largest repository of field photos at the USGS (over 33,000 photos). Prior to CDI funding, Land Cover Trends had limited funding to make the national collection of photos available online for researchers, land managers, and citizens. The goal of this CDI project was to add geotags and keywords to the digital copies of each field photo...
Assessing the Vulnerability of Dryland Ecosystems to Drought in the Western U.S.
In the western U.S., rising temperatures and pronounced drought conditions pose significant challenges to public land managers. Widespread declines of multiple plant species have already been observed, providing insight into what the future could look like for vegetation in the region as conditions are projected to become warmer and drier. To understand how vulnerable western ecosystems...
Linking Extreme Storms to Changes in Precipitation, Ecosystems, and Wildfire Patterns in the Sierra Nevada
The majority of the West Coast’s most extreme storms have been linked to atmospheric rivers, a meteorological phenomenon in which large amounts of moisture are carried in narrow bands from over the Pacific Ocean to western North America. While weak atmospheric rivers are critical providers of winter rain and snow, stronger events can cause extreme flooding, mudslides, and avalanches –...
Maximum and Minimum Inundation for the Confluence of the Sacramento and San Joaquin Rivers
The confluence of the Sacramento River and San Joaquin River (CA) undergoes considerable intra-annual changes in surface water inundation. The example illustrates the difference between maximum 2017 inundation (January-March) to lower levels of inundation towards the end of the calendar year.
The confluence of the Sacramento River and San Joaquin River (CA) undergoes considerable intra-annual changes in surface water inundation. The example illustrates the difference between maximum 2017 inundation (January-March) to lower levels of inundation towards the end of the calendar year.
South Lake Tahoe June 2016
High confidence DSWEmod water pixels (blue) from June 2016 covering South Lake Tahoe overlaid on top of a 2016 USDA NAIP image.
High confidence DSWEmod water pixels (blue) from June 2016 covering South Lake Tahoe overlaid on top of a 2016 USDA NAIP image.