astronomy

George F. Jenks

George F. Jenks is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand George F. Jenks rather than just read about it. In short: George Frederick Jenks (July 16, 1916 – December 29, 1996) was an American geographer known for his significant contributions to cartography and geographic information systems (GIS). With a career spanning over three decades, Jenks played a vital role in advancing map-making technologies, was instrumental in enhancing the visualization of spatial data, and played foundational roles in developing modern cartographic…

Key takeaways

George F. Jenks belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect George F. Jenks to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of George F. Jenks from memory before moving on to harder problems.

Reference excerpt

George Frederick Jenks (July 16, 1916 – December 29, 1996) was an American geographer known for his significant contributions to cartography and geographic information systems (GIS). With a career spanning over three decades, Jenks played a vital role in advancing map-making technologies, was instrumental in enhancing the visualization of spatial data, and played foundational roles in developing modern cartographic curricula. The Jenks natural breaks optimization, based on his work, is still widely used in the creation of thematic maps, such as choropleth maps.

Education and field George F. Jenks earned his B.S.Ed. in 1941 from the New York State College for Teachers (now University at Albany). He earned both his M.S. and Ph.D. in geography from Syracuse University in 1947 and 1950 respectively. Jenks initially focused his research on agricultural geography which formed the subject of both his master's thesis and doctoral dissertation, with his dissertation being titled "New Land Development in the Rice Economy of the Weiner Area, Arkansas." After being exposed to Richard Edes Harrison as a cartography instructor, Jenks shifted towards researching cartography. This interest led Jenks to become one of the most influential cartographic researchers of the 20th century.

Career

Military

Jenks joined the United States Army Air Corps in 1941 after graduating with his bachelor's degree. During World War II, he served as an instructor of aerial navigation, holding the highest rank of First lieutenant. Jenk's time as an instructor of aerial navigation inspired him to pursue a career in geography.

Academic After his time in the military, Jenks went to graduate school at Syracuse University to study geography. After graduating from Syracuse University, Jenks's first position was at the Department of Rural Economics and Sociology at the University of Arkansas. In 1949, Jenks took a position in the Geography Department at the University of Kansas. Here, Jenks would grow the cartography program within the University of Kansas department of geography into one of the most influential in the country. Throughout his career, Jenks advocated for improved curriculums for cartographers and a greater focus on the science of applied mapping. Jenks retired from the University of Kansas in 1986. While Jenks publications and research were highly influential, he is noted to have focused much of his energy on helping his graduate students. These students carried his influence into other geography departments across the United States, shaping how cartographic training is accomplished. He continued to work with graduate students at the University of Kansas even after his retirement in 1986.

Research and Publications

Jenks early publications focus on his interest in agricultural geography. After receiving a grant award from the Fund for the Advancement of Science, Jenks research shifted towards improving cartography, both in terms of map production and training of cartographers. This led to decades of publications focused on human error introduced into maps by cartographers, generalization introduced during the mapping process, eye movement, three-dimensional mapping, geostatistics, and thematic mapping in general. As the concept of computer cartography was only introduced in 1959 by Waldo Tobler, Jenks publications were extremely influential in laying the foundation for GIS, thematic mapping, and modern cartography. The Kenneth Spencer Research Library at the University of Kansas maintains the "Personal Papers of George F. Jenks" and "George F. Jenks Map Collection."

Jenks natural breaks optimization method

One of the most influential concepts developed by Jenks in terms of applied cartography is the Jenks Natural Breaks optimization method. Jenks made a breakthrough with the development of the "Jenks Natural Breaks Optimization Algorithm," commonly known as the Jenks Natural Breaks Algorithm, in a 1967 paper. This algorithm is widely used in cartography and GIS to classify data into natural groupings, thereby enhancing the visual representation of data on maps. The algorithm optimally minimizes the variance within each group and maximizes the variance between groups, resulting in more effective data visualization. It is the default method for dividing classes in thematic maps such as choropleths in Esri software, such as ArcGIS. This method has limitations, and alternative methods for dividing classes include quantiles, standard deviation, and equal interval.

Awards Faculty Fellowship, Fund for the Advancement of Education, 1951-52 Citation for Meritorious Contribution to the Field of Geography, Association of American Geographers, 1952 Honors Award for Outstanding Achievement, American Cartographic Association of the American Congress on Surveying and Mapping, 1982 Named Fellow, the American Association for the Advancement of Science, 1987 Master Teacher Award, National Council on Geographic Education, 1987

Illustrations

Worked examples

Example 1 — a first encounter with George F. Jenks

Start with the simplest possible case. Write down what George F. Jenks claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to George F. Jenks before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about George F. Jenks ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of George F. Jenks

In research: George F. Jenks appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses George F. Jenks in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: George F. Jenks is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1916 births, 1996 deaths, 20th-century cartographers, so understanding it makes those chapters shorter.
In everyday life: Look for George F. Jenks outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study George F. Jenks in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what George F. Jenks means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain George F. Jenks out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is George F. Jenks in simple terms?

Why does George F. Jenks matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study George F. Jenks?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on George F. Jenks.