Field Geophysics – Sampling and Aliasing Theory and Examples
Lawrence Braile
, Earth and Atmospheric Sciences, Purdue University
Author Profile
This activity has benefited from input from faculty educators beyond the author through a review and suggestion process.
HideThis activity has benefited from input from faculty educators beyond the author through a review and suggestion process.
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This page first made public: Dec 8, 2011
Summary
Collecting geosciences data in the field involves sampling in time and space. Sampling includes theoretical limitation and the possibility of aliasing which has severe effects on sampled data. The concepts are applicable to spatial sampling and geological data. The discussion is most appropriate for classroom or computer laboratory use prior to field data collection.
Context
Audience
Geological and geophysical data analysis. Upper level undergraduate or graduate course.
Skills and concepts that students must have mastered
Computer programming, some understanding of time series analysis and Fourier series or Fourier transforms.
How the activity is situated in the course
Stand alone discussion, early in course on data analysis.
Goals
Content/concepts goals for this activity
Understanding of limitations of sampled data and illustrations of the effects of improper sampling in time and space.
Higher order thinking skills goals for this activity
Fundamentals of sampling theory, examples of Fourier analysis.
Other skills goals for this activity
Develop time series analysis skills.
Description of the activity/assignment
Collecting geosciences data in the field involves sampling in time and space. Sampling includes theoretical limitation and the possibility of aliasing which has severe effects on sampled data. The material presented here focuses on geophysical data and time domain sampling. The concepts are applicable to spatial sampling and geological data. Examples of time series analysis and Fourier analysis are included. The discussion is most appropriate for classroom or computer laboratory use prior to field data collection.
Determining whether students have met the goals
Exam questions related to sampling and aliasing. Class discussion.
More information about assessment tools and techniques.Download teaching materials and tips
- Field Geophysics – Sampling and Aliasing Theory and Examples (Microsoft Word 29kB Jul26 10)
