Martin H. Trauth, University of Potsdam, Germany
On April 1, 2022, a satellite was launched as part of the German Environmental Mapping and Analysis Program (EnMAP) to collect hyperspectral data, which can be obtained free of charge. Here is a MATLAB script to import and display the data and display the spectra of single pixels selected from an EnMAP image.
Continue reading “Displaying Flatfield Spectra from EnMAP Hyperspectral Images with MATLAB”
The USGS spectral library is an important database of mineral spectra, which is used as a reference for the spectrometric determination of unknown substances. Here is a simple MATLAB program that can be used to load and display the spectra of several minerals. Continue reading “Importing and Displaying USGS Spectral Library Data with MATLAB”
Artificial neural networks (ANNs) have been used for quite some time to identify, for example, flowers in easy-to-use apps on smartphones. They have been, however, the focus of great attention since the introduction of generative artificial intelligence chatbots like OpenAI’s ChatGPT. Here is the MATLAB and Python code of an artificial neural network with backpropagation in 6 Steps.
Continue reading “An Artificial Neural Network with Backpropagation in 6 Steps”
Multispectal imaging captures images across multiple spectral bands. Here is a MATLAB example where eight different spectral bands in visible light and near infrared show differences in a rock sample that are invisible to the human eye. Continue reading “Multispectral Imaging of Rock Samples with MAPIR Cameras”
Thanks to the ongoing support of MathWorks Inc. through their Curriculum Development Program, I was able to purchase two additional spectral cameras. The MAPIR Survey2 cameras are no longer available. They have been replaced by the Survey3, which has slightly different features. Here is an example of how to import and process the RAW images in MATLAB.
Continue reading “Capturing Spectral Images with the new MAPIR Survey3 Camera”
From July 12-15, 2025, I will be participating in an ICDP workshop on LKD, where I will give a presentation on time series analysis. In the presentation, I will show a QR code with links to literature on the topic that we have written and courses on the topic. Continue reading “Recommended Reading on Time Series Analysis by M.H. Trauth and Colleagues”
Most methods of time series analysis require evenly spaced time axes, which is why we have to convert unevenly spaced time series into a time series with an evenly spaced time axis using interpolation. Continue reading “Interpolating Unevenly Spaced Data With MATLAB”
Ever since the introduction of electronic devices with touch controls, interactive 3D graphics objects have become increasingly popular in multimedia electronic books (ebooks). The Lidar Toolbox and the Computer Vision Toolbox from MathWorks provide the necessary tools for creating and exporting 3D graphics objects for inclusion in documents such as multimedia ebooks, interactive websites, and presentations (MathWorks 2025a, b).