This remote sensing e-course will focus on comparing the Minimum Distance, Maximum Likelihood, and Spectral Angle Mapper algorithms for semi-automatic classification of Landsat 8 OLI imagery in QGIS. The course will explain the concepts, demonstrate the algorithms in QGIS, and have students complete exercises to classify land cover and assess accuracy. Minimum Distance classifies pixels based on distance to class means, Maximum Likelihood uses probability, and Spectral Angle Mapper compares spectral angles insensitive to illumination.
The advantage of digital imagery is that it allows us to manipulate the digital pixel values in the image. Even after the radiometric corrections image may still not be optimized for visual interpretation. An image 'enhancement' is basically anything that makes it easier or better to visually interpret. An enhancement is performed for a specific application as well. This enhancement may be inappropriate for another purpose, which would demand a different type of enhancement.
Filtering is used to enhance the appearance of an image. Spatial filters are designed to highlight or suppress specific features in an image based on their spatial frequency. ‘Rough’ textured areas of an image, where the changes in tone are abrupt, have high spatial frequencies, while ‘smooth’ areas with little variation have low spatial frequencies. A common filtering procedure involves moving a ‘matrix' of a few pixels in dimension (ie. 3x3, 5x5, etc.) over each pixel in the image, using mathematical calculation and replacing the central pixel with the new value.
A low-pass filter is designed to emphasize larger, homogeneous areas of similar tone and reduce the smaller detail in an image. Thus, low-pass filters generally serve to smooth the appearance of an image. In some cases, like 'low-pass filtering', the enhanced image can actually look worse than the original, but such an enhancement was likely performed to help the interpreter see low spatial frequency features among the usual high frequency clutter found in an image. High-pass filters do the opposite and serve to sharpen the appearance of fine detail in an image. Directional, or edge detection filters are designed to highlight linear features, such as roads or field boundaries. These filters can also be designed to enhance features which are oriented in specific directions.
THIS PRESENTATION IS TO HELP YOU PERFORM THE TASK STEP BY STEP.
The advantage of digital imagery is that it allows us to manipulate the digital pixel values in the image. Even after the radiometric corrections image may still not be optimized for visual interpretation. An image 'enhancement' is basically anything that makes it easier or better to visually interpret. An enhancement is performed for a specific application as well. This enhancement may be inappropriate for another purpose, which would demand a different type of enhancement.
Filtering is used to enhance the appearance of an image. Spatial filters are designed to highlight or suppress specific features in an image based on their spatial frequency. ‘Rough’ textured areas of an image, where the changes in tone are abrupt, have high spatial frequencies, while ‘smooth’ areas with little variation have low spatial frequencies. A common filtering procedure involves moving a ‘matrix' of a few pixels in dimension (ie. 3x3, 5x5, etc.) over each pixel in the image, using mathematical calculation and replacing the central pixel with the new value.
A low-pass filter is designed to emphasize larger, homogeneous areas of similar tone and reduce the smaller detail in an image. Thus, low-pass filters generally serve to smooth the appearance of an image. In some cases, like 'low-pass filtering', the enhanced image can actually look worse than the original, but such an enhancement was likely performed to help the interpreter see low spatial frequency features among the usual high frequency clutter found in an image. High-pass filters do the opposite and serve to sharpen the appearance of fine detail in an image. Directional, or edge detection filters are designed to highlight linear features, such as roads or field boundaries. These filters can also be designed to enhance features which are oriented in specific directions.
THIS PRESENTATION IS TO HELP YOU PERFORM THE TASK STEP BY STEP.
This presentation gives an overview about semi-supervised learning methods (Least square solution, Eigen vectors and Eigen functions). It points to some of the applications these methods can be used like object categorization and Interactive Image segmentation
My special talk on 'GIS & Remote Sensing-Introduction to the Primer’ is a part of the 'Learn from the Leaders- 2' webinar series organized by IEEE SIGHT, Bombay section on May 25th, 2021
Object Classification of Satellite Images Using Cluster Repulsion Based Kerne...IOSR Journals
Abstract: We investigated the Classification of satellite images and multispectral remote sensing data .we
focused on uncertainty analysis in the produced land-cover maps .we proposed an efficient technique for
classifying the multispectral satellite images using Support Vector Machine (SVM) into road area, building area
and green area. We carried out classification in three modules namely (a) Preprocessing using Gaussian
filtering and conversion from conversion of RGB to Lab color space image (b) object segmentation using
proposed Cluster repulsion based kernel Fuzzy C- Means (FCM) and (c) classification using one-to-many SVM
classifier. The goal of this research is to provide the efficiency in classification of satellite images using the
object-based image analysis. The proposed work is evaluated using the satellite images and the accuracy of the
proposed work is compared to FCM based classification. The results showed that the proposed technique has
achieved better results reaching an accuracy of 79%, 84%, 81% and 97.9% for road, tree, building and vehicle
classification respectively.
Keywords:-Satellite image, FCM Clustering, Classification, SVM classifier.
Image segmentation is useful in many applications. It can identify the regions of interest in a scene or annotate
the data. It categorizes the existing segmentation algorithm into region-based segmentation, data clustering, and
edge-base segmentation. Region-based segmentation includes the seeded and unseeded region growing
algorithms, the JSEG, and the fast scanning algorithm. Due to the presence of speckle noise, segmentation of
Synthetic Aperture Radar (SAR) images is still a challenging problem. We proposed a fast SAR image
segmentation method based on Particle Swarm Optimization-Gravitational Search Algorithm (PSO-GSA). In
this method, threshold estimation is regarded as a search procedure that examinations for an appropriate value in
a continuous grayscale interval. Hence, PSO-GSA algorithm is familiarized to search for the optimal threshold.
Experimental results indicate that our method is superior to GA based, AFS based and ABC based methods in
terms of segmentation accuracy, segmentation time, and Thresholding.
JPM1407 Exposing Digital Image Forgeries by Illumination Color Classificationchennaijp
JP INFOTECH is one of the leading Matlab projects provider in Chennai having experience faculties. We have list of image processing projects as our own and also we can make projects based on your own base paper concept also.
For more details:
http://jpinfotech.org/final-year-ieee-projects/2014-ieee-projects/matlab-projects/
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Unsupervised Building Extraction from High Resolution Satellite Images Irresp...CSCJournals
Extraction of geospatial data from the photogrammetric sensing images becomes more and more important with the advances in the technology. Today Geographic Information Systems are used in a large variety of applications in engineering, city planning and social sciences. Geospatial data like roads, buildings and rivers are the most critical feeds of a GIS database. However, extracting buildings is one of the most complex and challenging tasks as there exist a lot of inhomogeneity due to varying hierarchy. The variety of the type of buildings and also the shapes of rooftops are very inconstant. Also in some areas, the buildings are placed irregularly or too close to each other. For these reasons, even by using high resolution IKONOS and QuickBird satellite imagery the quality percentage of building extraction is very less. This paper proposes a solution to the problem of automatic and unsupervised extraction of building features irrespective of rooftop structures in multispectral satellite images. The algorithm instead of detecting the region of interest, eliminates areas other than the region of interest which extract the rooftops completely irrespective of their shapes. Extensive tests indicate that the methodology performs well to extract buildings in complex environments.
Classification of Multi-date Image using NDVI valuesijsrd.com
Advance Wide Field Sensor (AWiFS) of IRS P6 is an improved version of WiFS of IRS-1C/1D. AWiFS operates in four spectral bands identical to LISS III (Low-Imaging Sensing Satellite). Normalized Difference Vegetation Index (NDVI) is a simple graphical indicator that can be used to analyze remote sensing measurements. These indexes can be used to prediction of classes of Remote Sensing (RS) images. In this paper, we will classify the AWiFS image on NDVI values of 5 different date's images (Captured by AWiFS satellite). For classifying images, we will use an algorithm called Sum of Squared Difference (SSD). It will compare the clustered image with the Reference image based on SSD and the best match on the basis of SSD algorithm, it will classify the image. It is simple 1 step process, which will be faster compared to the classical approach.
Dr. Fariba Fahroo presents an overview of her program, Optimization and Discrete Mathematics, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Comparison of Segmentation Algorithms and Estimation of Optimal Segmentation ...Pinaki Ranjan Sarkar
Recent advancement in sensor technology allows very high spatial resolution along with multiple spectral bands. There are many studies, which highlight that Object Based Image Analysis(OBIA) is more accurate than pixel-based classification for high resolution(< 2m) imagery. Image segmentation is a crucial step for OBIA and it is a very formidable task to estimate optimal parameters for segmentation as it does not have any unique solution. In this paper, we have studied different segmentation algorithms (both mono-scale and multi-scale) for different terrain categories and showed how the segmented output depends on upon various parameters. Later, we have introduced a novel method to estimate optimal segmentation parameters. The main objectives of this study are to highlight the effectiveness of presently available segmentation techniques on very high-resolution satellite data and to automate segmentation process. Pre-estimation of segmentation parameter is more practical and efficient in OBIA. Assessment of segmentation algorithms and estimation of segmentation parameters are examined based on the very high-resolution multi-spectral WorldView-3(0.3m, PAN sharpened) data.
Multispectral images are used for space Arial application, target detection and remote sensing application. MS images are very rich in spectral resolution but at a cost of spatial resolution. We propose a new method to increase a spatial resolution MS images. For spatial resolution enhancement of MS images we need to employ a super-resolution technique which uses a Principal Component Analysis (PCA) based approach by learning an edge details from database. Experiments have been carried out on both real multispectral (MS) data and MS data. This experiment is done with the usefulness for hyper spectral (HS) data as a future work.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
Semi-Automatic Classification Algorithm: The differences between Minimum Distance, Maximum Likelihood, and Spectral Angle Mapper
1. Fatwa Ramdani
Geoenvironment, Earth Science, Grad. School of Science
Remote sensing e-course
Semi-Automatic Classification Algorithm: The
differences between Minimum Distance, Maximum
Likelihood, and Spectral Angle Mapper
2. Outline
• This course will focus in Semi-Automatic Classification
Algorithm: The differences between Minimum Distance,
Maximum Likelihood, and Spectral Angle Mapper based on
remotely-sensed data; Landsat 8 OLI. The methods how to
analyze and exploit the Landsat 8 OLI information for Land Use
mapping will be illustrated in QGIS open source software.
• In final section will be follow with the exercise and questions to
allow student expand their understanding.
3. Course Goal and Objectives
• Understand the concept of Semi-Automatic Classification
Algorithm
• Understand algorithm in QGIS open source software
• Understand the differences between Minimum Distance,
Maximum Likelihood, and Spectral Angel Mapper algorithm
4. Intended Audience
• University student with basic level of
knowledge in Remote Sensing studies
• Course Requirements:
– Internet access
– QuantumGIS software (http://www.qgis.org/en/site/forusers/download.html)
– Downloaded data
5. Semi-Automatic Classification Algorithm
General algorithm of imagery classification
Raw DN
Conversion into TOA
using DOS method
TOA
Band set
Knowledge of
the study area
Producing ROI
(sampling of training data)
Running Semi-Automatic
Classification
Land cover
classification
Accuracy
assessment
Statistic
calculation
Manual input
6. Minimum Distance
The minimum distance technique uses
the mean vectors of each endmember
and calculates the Euclidean distance
from each unknown pixel to the mean
vector for each class. All pixels are
classified to the nearest class unless a
standard deviation or distance threshold
is specified, in which case some pixels
may be unclassified if they do not meet
the selected criteria.
Reference
Richards, J.A., 1999, Remote Sensing Digital Image
Analysis, Springer-Verlag, Berlin, p. 240.
7. Maximum Likelihood
Maximum likelihood classification assumes
that the statistics for each class in each band
are normally distributed and calculates the
probability that a given pixel belongs to a
specific class. Unless you select a probability
threshold, all pixels are classified. Each pixel is
assigned to the class that has the highest
probability (that is, the maximum likelihood).
If the highest probability is smaller than a
threshold you specify, the pixel remains
unclassified.
Reference
Richards, J.A., 1999, Remote Sensing Digital Image Analysis,
Springer-Verlag, Berlin, p. 240.
Instead based on training class multispectral distance
measurements, the maximum likelihood decision rule
is based on probability.
The maximum likelihood procedure assumes that
each training class in each band are normally
distributed (Gaussian).
The probability of a pixel belonging to each of a
predefined set of X classes is calculated, and the pixel
is then assigned to the class for which the probability
is the highest.
8. Spectral Angle Mapper
Spectral Angle Mapper (SAM) is a physically-based spectral classification that uses an n-D angle to match pixels
to reference spectra. The algorithm determines the spectral similarity between two spectra by calculating the
angle between the spectra and treating them as vectors in a space with dimensionality equal to the number of
bands. This technique, when used on calibrated reflectance data, is relatively insensitive to illumination and
albedo effects. Endmember spectra used by SAM can come from ASCII files or spectral libraries, or you can
extract them directly from an image (as ROI average spectra). SAM compares the angle between the
endmember spectrum vector and each pixel vector in n-D space.
Small angles between the two spectrums indicate high similarity and high angles indicate low similarity. This
method is not affected by solar illumination factors, because the angle between the two vectors is independent
of vectors length.
SAM classification assumes reflectance data. However, if you use radiance data, the error is generally not
significant because the origin is still near zero.
Reference
Kruse, F. A., A. B. Lefkoff, J. B. Boardman, K. B. Heidebrecht, A. T. Shapiro, P. J. Barloon, and A. F. H. Goetz, 1993, “The Spectral
Image Processing System (SIPS) - Interactive Visualization and Analysis of Imaging spectrometer Data.” Remote Sensing of the
Environment, v. 44, p. 145 - 163.
9. Activities!
• Check your computer spec, if 64bit then install the WinPhython first
• Download QGIS and install the Semi-Automatic Classification Plugin, run
your QGIS and click Plugins – Manage and Install Plugins..
• Learn step-by-step the algorithm of Semi-Automatic Classification
• Compare the result between three different method!
10. Algorithm
Raw DN
Conversion into TOA
using DOS method
TOA
Band set
Knowledge of
the study area
Producing ROI
(sampling of training data)
Running Semi-Automatic
Classification
Land cover
classification
Accuracy
assessment
Statistic
calculation
Manual input
11. Exercise!
• Explore the DN and TOA values of different
land cover!
• Produce the scatter plot and signature plot of
land cover and analyse it!
15. Quiz?
• Which method is the best one? Why?
• What are the advantages and the
disadvantages of the each method?
• What is the difference between Land Use and
Land Cover?
16. Resources
• Kruse, F. A., A. B. Lefkoff, J. B. Boardman, K. B. Heidebrecht, A. T. Shapiro, P. J. Barloon, and A.
F. H. Goetz, 1993, “The Spectral Image Processing System (SIPS) - Interactive Visualization and
Analysis of Imaging spectrometer Data.” Remote Sensing of the Environment, v. 44, p. 145 -
163.
• Richards, J.A., 1999, Remote Sensing Digital Image Analysis, Springer-Verlag, Berlin, p. 240.
• http://fatwaramdani.wordpress.com/2014/06/26/land-use-classification-using-qgis/
Read more from Luca Congedo, the author of the Semi-Automatic Classification Plugin for QGIS,
here
• http://fromgistors.blogspot.pt/2014/06/land-cover-classification-using-SCP-3.html