Student Research Reports
Land Cover Verification and Error Analysis for Citizen Science Applications
Country:United States of America
Student(s):Rebecca Lawton, Rhea Rai, Anahid Vicente
Grade Level:Secondary School (grades 9-12, ages 14-18)
GLOBE Educator(s):Cassie Soeffing
Contributors:Dr. Rusty Low, IGES, scientist
Peder Nelson, OSU, sme
Dr. Erika Podest, NASA JPL, scientist
Andrew Clark, IGES, EO Researcher and Data Analyst
Report Type(s):International Virtual Science Symposium Report, Mission Mosquito Report
Protocols:Land Cover Classification, Earth As a System, Mosquitoes
Presentation Video:
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Presentation Poster:
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Language(s):English
Date Submitted:01/24/2023
Although the accuracy of global land cover data products has greatly increased in recent
years due to technological advancements, the visual understanding of Earth’s surface that
scientists obtain from existing land cover maps often diverges from ground observations
obtained during field investigations. Today, many high resolution land cover maps such as the
European Space Agency’s (ESA) 2020 WorldCover (WC) map stand at an accuracy below 75%.
Faced with these accuracy limitations, scientists have turned to in-situ citizen science
observations such as those from GLOBE Observer to supplement existing land cover data and to
increase its accuracy. Our research focused on increasing the impact of citizen science by
identifying the key environmental and geographical factors associated with discrepancies
between an official land cover map, WorldCover, and citizen scientist land cover classification of
satellite imagery through Collect Earth Online (CEO). According to our statistical analysis
conducted using computer-generated confusion matrices, the agreement between citizen scientist
and WorldCover land cover classifications was highest in areas with mostly homogenous land
cover. There is a relatively strong negative association between land cover diversity and
classification agreement. Additionally, we observed that classification agreement is negatively
correlated with the highest amount of shrubland classified between the citizen scientists and the
WC map. This is because shrubland is often confused for other types of vegetation and vice
versa. Using the numerous associations we found, we were able to identify the types of areas in
which citizen science observations will be most useful in providing new insights into land cover.
This information can potentially help provide a more effective and streamlined method for
scientists to document and collect impactful crowd-sourced data. By helping to improve global
land cover maps through citizen science, our research may assist professionals in diverse fields
fight some of the world’s most pressing issues, including those involving natural resource
management and mosquito source reduction.
Key words: land cover, data accuracy, citizen science, remote sensing