IN FOCUS: The History of IEEE GRSS at 65: 1975-1978

By Joanne Van Voorhis

The IEEE Geoscience and Remote Sensing Society (GRSS) marks its 65th anniversary in 2026. We continue our 12-part series by examining the period from 1975 to 1978 and exploring how a phase of recovery and technological convergence reshaped the future of the field.

Part IV – Renewal and Multidisciplinary Integration (1975-1978)

By the mid-1970s, the Group on Geoscience Electronics (G-GE) had survived its lean years and was beginning to rebuild. The financial and organizational struggles of the early part of the decade had given way to cautious optimism, fueled by a new generation of leaders and by the continuing success of satellite Earth-observation programs. The community’s focus shifted from survival to scientific renewal and interdisciplinary collaboration.

The 1975-1978 period stands as a turning point. G-GE was still a small technical group within IEEE, but it had a strong sense of purpose. Advances in remote-sensing technology, combined with the rapid development of digital computing and image processing, were opening new possibilities. The Society’s leaders recognized that the future of geoscience electronics lay not just in instrumentation but in the integration of data, theory, and application across the entire Earth system.

Leadership and Contributors for a New Phase

During the mid- to late-1970s, the IEEE Geoscience Electronics Group (G-GE) underwent a period of renewal shaped by a broad cohort of volunteers spanning engineering and Earth science disciplines. Among these contributors were John W. Rouse Jr. (Chair, 1975), Stephen Riter (Editor, G-GE Transactions, 1972-1976), and Haralambos “Harry” N. Kritikos (Editor, G-GE Transactions, 1976-1981) whose work reflected complementary facets of the evolving field. Rouse’s contributions to satellite-based vegetation analysis, particularly through early Landsat-era research, highlighted the growing importance of environmental applications. Riter’s involvement in systems engineering and data processing supported the integration of sensing technologies with emerging computational methods, while Kritikos’s expertise in electromagnetics reinforced the theoretical foundations underlying radar and radiometric remote sensing.

Of course the broadening and eventual transformation of G-GE was a collective effort involving many dedicated volunteers, its full Administrative Committee, journal contributors, and an expanding and involved international membership. During this period, the group strengthened its publication activities and broadened its technical scope. By actively engaging researchers in meteorology, oceanography, hydrology, and atmospheric physics, G-GE evolved beyond its original engineering focus toward a more interdisciplinary identity. This transition anticipated the “Earth system” perspective that would later define GRSS following its formal reorganization in the early 1980s.

From Uncertainty to Convergence

In this era, G-GE entered a period of gradual recovery following the organizational and identity challenges of the early part of the decade, as the external technological landscape was shifting decisively in its favor. What had been emerging trends in the early 1970s now began to converge into a coherent and sustainable scientific discipline. A central driver of this transition was the maturation of space-based Earth observation. Building on the early success of Landsat 1 (launched in 1972), subsequent missions such as Landsat 2 (1975) delivered increasingly reliable multispectral data for applications ranging from agriculture and forestry to geology and land-use mapping. These datasets moved remote sensing beyond experimental demonstration toward routine scientific and operational use, reinforcing the importance of quantitative analysis and repeatable measurement.

Journal Scope and Optimism from the President

Within the pages of IEEE Transactions on Geoscience Electronics, this shift was evident in broadened topics and scope of published work. Contributions increasingly not only addressed sensor design such as radiometers and radar systems but also calibration methods, geophysical interpretation, and large-scale environmental applications. The journal became a focal vehicle to explore how engineering innovation and Earth science inquiry were brought into closer alignment.

In the January 1976 issue, John W. Rouse Jr. expressed optimism for the changes made during his year as Chair, addressing the many changes within G-GE: “The AdCom has been reorganized and revitalized. Membership is up. The Newsletter is back. G-GE is again actively represented on several conference committees. This has been a good year and next year will be even better!”

He also commented on how the new Transactions Editor, Haralambos Kritikos, was broadening the scope of the journal, noting that he had “assembled several associate editors representing specific interest groups. The areas already identified for emphasis include Radio Meteorology, Solid Earth Geophysics, Marine Geophysics, Extraterrestrial Geophysics, Environmental Monitoring, Computer Processing of Geophysical Data, and Microwave Remote Sensing.”

He further described how the basic concept upon which the Geoscience Electronics Group was founded was even more significant in 1976 than when it was first introduced: “Engineers are being called upon to an even greater degree to apply their skills to improving man’s understanding of the earth, oceans, and atmosphere. The geoscientists are likewise pressed to adapt modern electronic techniques to assist with their tasks. G-GE provides the much needed forum for the many diverse disciplines represented.”

Advances in Computing and Microwave Remote Sensing

At this time, advances in computing began to reshape how remotely sensed data could be processed and understood. The growing availability of minicomputers and time-shared systems enabled researchers to work with digital imagery in ways that had not been practical just a few years earlier. Early image-processing techniques such as statistical classification, numerical modeling, and algorithmic correction of sensor data started to appear more frequently in G-GE publications and conference presentations. Although still developing, these approaches marked the beginning of a transition from analog interpretation to computational analysis.

Microwave remote sensing also gained momentum during this period. Airborne radar experiments and theoretical studies of electromagnetic scattering expanded understanding of how signals interacted with vegetation, soil, and ocean surfaces. This line of work reached an important milestone with the launch of Seasat in 1978. Despite its short operational life, Seasat demonstrated the potential of active microwave systems, including scatterometers and radar altimeters, to observe ocean dynamics and surface roughness on a global scale. Its results pointed clearly toward the next generation of satellite missions and research priorities.

Special Transaction Issue and Introduction of Cover Design

The January 1978 Issue of Transactions on Geoscience Electronics was notable. First, it is perhaps the earliest example of an issue with a color and graphical cover (based on availability on IEEExplore), and second, it was a special issue on pollution and climate. Throughout the decade, growing public awareness, landmark environmental legislation such as the U.S. Clean Air Act (1970) and Clean Water Act (1972), and international initiatives like the 1972 UN Stockholm Conference and the establishment of the United Nations Environment Programme (UNEP) had framed pollution and climate as urgent global challenges.

Samuel Musa, Institute for Defense Analyses and Guest Editor, explained the goal of the special issue: “This special issue on pollution and anthropogenic changes of climate and ultraviolet radiation was motivated by the growing concern within our society with the consequences of human activities and man-made pollution on the global environment. The primary sources of pollution are 1) the burning of fossil fuels which increase the concentration of carbon dioxide in the atmosphere, 2) albedo modification from clearing of land and deforestation, 3) extensive production of industrial smoke and smog (aerosols), and 4) changes in atmospheric ozone by increased use of fertilizers, aerosol spray cans, and stratospheric engine emissions. The assessment of the global effects of pollutants on climate and ozone is an enormously complex problem which has attracted considerable attention and controversy. The nearterm effects are difficult to predict.”

Notable articles (which are quite interesting to read in retrospect) included “Understanding Anthropogenic Effects on Ultraviolet Radiation and Climate,” by Henry Hidalgo; “The Nature of Climate and Climatic Variations,” by John E. Kutzbach; “Global Air Pollution and Climate Change,” by William W. Kellogg and Stephen H. Schneider; and “Man and Climate: An Overview,”  by Earl W. Barrett. Barrett’s abstract was insightful: “Although the global effects of human activities on climate are still undetectable against the background “noise level” of natural climatic fluctuations, some of the latest mathematical climate models (which are still rather crude) predict significant effects in the relatively near future if present rates of population growth, increase in per-capita energy use, and industrial expansion persist or rise.”

Education and Community Building

During the late 1970s, G-GE did not yet have formal educational programs (which would emerge in the next decade) but its conferences and publications played an important role in the exchange of knowledge within the emerging field of remote sensing. As techniques became more complex, particularly in areas such as microwave sensing and digital data analysis, the need for broader technical understanding was increasingly reflected in the range of topics presented at IEEE meetings and published in the IEEE Transactions on Geoscience Electronics.

Papers and conference presentations during this period increasingly emphasized analytical methods, data interpretation, and applications alongside instrumentation. This shift contributed to the informal dissemination of knowledge, as researchers shared methodologies, experimental results, and processing approaches through publications and technical discussions. In this way, G-GE functioned as a forum through which both established practitioners and newcomers could engage with rapidly evolving techniques.

At the same time, universities expanded graduate-level instruction and research activities that connected electrical engineering with environmental and Earth science applications. Institutions such as Purdue University, University of Michigan, and Texas A&M University were among those with active research groups and instructional efforts in remote sensing.

Preparing for a New Identity

By the late 1970s, this convergence of satellite capability, computational methods, and interdisciplinary collaboration had begun to redefine the identity of the G-GE. What had started as a relatively small, instrumentation-focused community was fast evolving into a broader scientific and engineering enterprise centered on observing and understanding the Earth as an integrated system. This transformation did not yet have a formal name, but it set the stage for the organizational changes that would follow at the end of the decade, including the eventual transition from Geoscience Electronics to Geoscience and Remote Sensing.

Next month we will explore “The History of IEEE GRSS at 65: A New Identity (1979-1981): The Birth of the IEEE Geoscience and Remote Sensing Society.

Take a Closer Look:

• IEEE Transactions on Geoscience Electronics (Volume: 14, Issue: 1, January 1976)
• IEEE Transactions on Geoscience Electronics (Volume: 14, Issue: 1, January 1978 Special Issue on Pollution and Climate)