News Stories

  • June

    USACE Marks 250 Years with Pivotal Support to the Army’s Birthday

    As the U.S. Army celebrated its 250th anniversary June 14 with a birthday festival and parade in the nation's capital, the U.S. Army Corps of Engineers was hard at work behind the scenes and on the logistical front lines. In a powerful intersection of history and engineering excellence, USACE’s contributions helped ensure parade success while also symbolizing its own 250th anniversary of building and defending the nation.
  • May

    USACE Navigation mission critical to Armed Forces’ strategic readiness

    When the U.S. Army's 101st Airborne Division (Air Assault) needs to move over 1,000 trucks, trailers, and tons of equipment for a large training exercise, they rely on the cost-effectiveness and convenience of the nation’s waterways.
  • The Corps Environment – Spring 2025 edition now available

    The Spring 2025 edition of The Corps Environment is now available! This publication highlights how the U.S. Army Corps of Engineers is turning environmental challenges into mission-ready solutions. Content in this issue includes ongoing projects and initiatives from across the Army environmental community that are leveraging environmental stewardship as a force multiplier — enhancing military readiness, strengthening strategic partnerships and supporting community well-being.
  • USACE Completes Two-Week Regional Power Mission Exercise, Prepares for Upcoming Hurricane Season

    The U.S. Army Corps of Engineers (USACE) successfully concluded a two-week Regional Power Mission Exercise on May 16, enhancing its readiness to provide critical temporary emergency power in the wake of a major disaster.
  • U.S. Engineering Team Assesses Colón, Panama’s Infrastructure Challenges, Strengthening Bilateral Partnership

    A team from the U.S. Army’s 553rd Forward Engineer Support Team-Advance (FEST-A) drove around important parts of the city of Colón, Panama, surveying the stormwater and wastewater systems on May 13, 2025. The survey was designed to find ways to bolster the ongoing partnership between the United States and Panama while addressing one of Panama’s largest city’s long-standing infrastructure issues.
  • OPTIC: Transforming Mission Planning with Safety, Efficiency, and Innovation

    The proliferation of Unmanned Aircraft Systems (UAS) in civil works, emergency response, and military applications is the primary driver for development of the Operator’s Tool for Information Collection (OPTIC). Designed to meet operational needs, OPTIC leverages decades of experience to improve mission planning, operational tracking, and data-driven decisions for the U.S. Army Corps of Engineers (USACE).
  • April

    What is a Sapper? 250 Years of “Badass” Engineers

    In the U.S. Army Corps of Engineers, the term sapper carries weight. For 250 years, sappers have served as elite combat engineers, supporting frontline infantry in every war throughout American history.
  • March

    Double Duty: Chris Stewarts’ Service in and out of Uniform

    Chris "CJ" Stewart seamlessly balances his dual roles as a federal civilian logistics management specialist and an Army Reservist. Serving within the Resource Integration Division (RID) of the U.S. Army Corps of Engineers (USACE) Logistics Activity (ULA), Stewart's civilian duties involve assessing logistics through the Command Logistics Review Program (CLRP). Simultaneously, as a Motor Transport Operator (88M) in the Army Reserves, his military focus is also squarely on logistics. Stewart recently completed a year-long activation based in Poland, where his mission involved deterring, defending against, and potentially defeating adversarial aggression. His logistical support stretched across multiple countries, including Poland, Croatia, Slovenia, Lithuania, Latvia, Estonia, and Germany. During his deployment, Stewart held multiple critical command roles in addition to his regular duties, including SHARP Ambassador Program representative, Suicide Prevention Non-Commissioned Officer in Charge (NCOIC), Liaison Officer NCOIC, and Unit Movement Officer NCOIC.
  • USACE Aviation Program Office: Enhancing Efficiency and Compliance in UAS Operations

    The United States Army Corps of Engineers (USACE) Aviation Program Office (APO) plays a pivotal role in advancing crewed and uncrewed aviation missions across the organization. Established to meet the growing demands of Civil Works, Emergency Response, and Combatant Command operations, the APO serves as the central aviation authority for USACE, ensuring the safe, legal, and efficient operation of Uncrewed Aircraft Systems (UAS).
  • February

    The Corps Environment – Winter 2025 edition now available

    The Winter 2025 edition of The Corps Environment is now available! This edition features ongoing projects and initiatives that are proactively considering the environment and influencing partnerships in support of military readiness and community well-being.

News Releases

ERDC scientist creates algorithm to distinguish the forest from the trees

Dr. Sarah J. Becker, a physical scientist at the U.S. Army Engineer Research and Development Center’s Geospatial Research Laboratory (ERDC-GRL), posed in Colombia where she and other ERDC-GRL personnel collected ground-based hyperspectral data on native plants to determine if spectrally separable signatures between the different plants could be determined.

Dr. Sarah J. Becker, a physical scientist at the U.S. Army Engineer Research and Development Center’s Geospatial Research Laboratory (ERDC-GRL), posed in Colombia where she and other ERDC-GRL personnel collected ground-based hyperspectral data on native plants to determine if spectrally separable signatures between the different plants could be determined.

VICKSBURG, Miss. — When people think about the U.S. Army Engineer Research and Development Center (ERDC), there are many innovative solutions that come to mind — from blast-proof wallpaper used to protect employees at the Pentagon to the rover wheels created for landing on the moon.

However, two other innovative solutions deserve to be noticed: land cover mapping and statistical modeling, which both support our nation’s Warfighters. 

Forest cover maps derived from satellite and aerial imagery directly support military operations, but distinguishing tree cover from other vegetative land covers is an analytical challenge. Tree cover impacts military operations by hindering vehicle and troop movement, preventing helicopter access and providing concealment to the enemy, and it’s upon these challenges that ERDC’s Geospatial Research Laboratory’s (GRL) Physical Scientist Dr. Sarah J. Becker and her team recently focused their efforts.

Exploring nature is a passion for Becker, a Corte Madera, California, native, and working at GRL allows her to marry her passion and job. “I love exploring local parks and hiking trails, like Great Falls Park and the Washington & Old Dominion Trail in Virginia,” she said.

“While the commonly used Normalized Difference Vegetation Index can identify vegetative cover, it does not distinguish between tree and low-stature vegetation consistently,” Becker said. “We developed the Forest Cover Index (FCI) algorithm take the multiplicative product of the red and near infrared bands to separate tree cover from other land covers in multispectral imagery.”

Becker, along with GRL’s Megan C. Maloney and Andrew W.H. Griffin, first conducted a multi-biome study of tree cover detection. This study expanded testing on an algorithm that was developed in 2014 and has been tested in multiple studies since then.   

While tree maps already exist, they are static and may be outdated. This study provided a user-interactive way to generate updated tree maps. 

“We developed the FCI algorithm to identify tree cover in satellite imagery,” Becker said.  “Our first two papers focused on testing the algorithm in one location.  A recently submitted journal article expanded testing to other locations to determine if the algorithm was more widely applicable.”

Charting agriculture is work Becker is very familiar with.

“I spent many years mapping agriculture, which was how I came up with the idea to develop an algorithm to mask out tree cover, since trees are often confused with agriculture and other vegetation using traditional remote sensing techniques,” Becker said.  “My prior agricultural projects included hyperspectral ground-based data collection of agriculture and other objects.  I also completed projects to identify the optimal pixel size when working with data of different spatial resolutions and to study the relationship between environmental variables and conflict in Bangladesh.”

Becker earned her doctorate in environmental health, science, and policy from the University of California, Irvine, and her bachelor's degree in earth and planetary sciences from Johns Hopkins University. In her free time, she enjoys visiting her hometown and hiking the forested hillsides in and around Corte Madera, California, and in Virginia.

“Now that I study trees for a living, I pay more attention to trees in my recreational life too,” she said.


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