Image classification involves using spectral bands of images to separate landscape features into categories. Pixels with similar spectral signatures are clustered and classified using techniques like maximum likelihood classification. This results in a classified image map where each pixel is assigned a land cover class. However, classified maps have errors, so accuracy assessment is important to estimate the map's accuracy. Supervised classification involves using training areas of known land cover to develop spectral signatures for classification, while unsupervised classification clusters pixels without prior class definitions.
This presentation is about the raster and vector data in GIS which is important and costly as well, through the presentation we will learn about both type of data.
Digital Elevation Model (DEM) is the digital representation of the land surface elevation with respect to any reference datum. DEM is frequently used to refer to any digital representation of a topographic surface. DEM is the simplest form of digital representation of topography. GIS applications depend mainly on DEMs, today.
This presentation is about the raster and vector data in GIS which is important and costly as well, through the presentation we will learn about both type of data.
Digital Elevation Model (DEM) is the digital representation of the land surface elevation with respect to any reference datum. DEM is frequently used to refer to any digital representation of a topographic surface. DEM is the simplest form of digital representation of topography. GIS applications depend mainly on DEMs, today.
When you georeference your raster data, you define its location using map coordinates and assign the coordinate system of the map frame. Georeferencing raster data allows it to be viewed, queried, and analyzed with your other geographic data. The georeferencing tools on the Georeference tab allows you to georeference any raster dataset.
In general, there are four steps to georeference your data:
Add the raster dataset that you want to align with your projected data.
Use the Georeference tab to create control points, to connect your raster to known positions in the map
Review the control points and the errors
Save the georeferencing result, when you are satisfied with the alignment.
IMAGE INTERPRETATION TECHNIQUES of surveyKaran Patel
Image interpretation is the process of examining an aerial photo or digital remote sensing image and manually identifying the features in that image. This method can be highly reliable and a wide variety of features can be identified, such as riparian vegetation type and condition, and anthropogenic features
Types of Platforms
1. Airbrone Platforms
2. Spacebrone Platforms
Platforms are Vital Role in remote sensing data acquisition
Necessary to correct the position the remote sensors that collect data from the objects of interest
When you georeference your raster data, you define its location using map coordinates and assign the coordinate system of the map frame. Georeferencing raster data allows it to be viewed, queried, and analyzed with your other geographic data. The georeferencing tools on the Georeference tab allows you to georeference any raster dataset.
In general, there are four steps to georeference your data:
Add the raster dataset that you want to align with your projected data.
Use the Georeference tab to create control points, to connect your raster to known positions in the map
Review the control points and the errors
Save the georeferencing result, when you are satisfied with the alignment.
IMAGE INTERPRETATION TECHNIQUES of surveyKaran Patel
Image interpretation is the process of examining an aerial photo or digital remote sensing image and manually identifying the features in that image. This method can be highly reliable and a wide variety of features can be identified, such as riparian vegetation type and condition, and anthropogenic features
Types of Platforms
1. Airbrone Platforms
2. Spacebrone Platforms
Platforms are Vital Role in remote sensing data acquisition
Necessary to correct the position the remote sensors that collect data from the objects of interest
Image classification as a process of assigning all pixels in the image to particular classes or themes based on spectral information represented by the digital numbers (DNs). The classified image comprises a mosaic of pixels, each of which belong to a particular theme and is a thematic map of the original image.
Approaches to Classification There are two general approaches to image classification:
Supervised Classification: It is the process of identification of classes within a remote sensing data with inputs from and as directed by the user in the form of training data, and
Unsupervised Classification: It is the process of automatic identification of natural groups or structures within a remote sensing data.
The method of identifying similar groups of data in a data set is called clustering. Entities in each group are comparatively more similar to entities of that group than those of the other groups.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Mammogram image segmentation using rough clusteringeSAT Journals
Abstract The mammography is the most effective procedure to diagnosis the breast cancer at an early stage. This paper proposes mammogram image segmentation using Rough K-Means (RKM) clustering algorithm. The median filter is used for pre-processing of image and it is normally used to reduce noise in an image. The 14 Haralick features are extracted from mammogram image using Gray Level Co-occurrence Matrix (GLCM) for different angles. The features are clustered by K-Means, Fuzzy C-Means (FCM) and Rough K-Means algorithms to segment the region of interests for classification. The result of the segmentation algorithms compared and analyzed using Mean Square Error (MSE) and Root Means Square Error (RMSE). It is observed that the proposed method produces better results that the existing methods. Keywords— Mammogram, Data mining, Image Processing, Feature Extraction, Rough K- Means and Image Segmentation
In this presentation we discuss the convolution operation, the architecture of a convolution neural network, different layers such as pooling etc. This presentation draws heavily from A Karpathy's Stanford Course CS 231n
Study of the Class and Structural Changes Caused By Incorporating the Target ...ijceronline
High dimensional data when processed by using various machine learning and pattern recognition techniques, it undergoes several changes. Dimensionality reduction is one such successfully used pre-processing technique to analyze and represent the high dimensional data that causes several structural changes to occur in the data through the process. The high-dimensional data when used to extract just the target class from among several classes that are spatially scattered then the philosophy of the dimensionality reduction is to find an optimal subset of features either from the original space or from the transformed space using the control set of the target class and then project the input space onto this optimal feature subspace. This paper is an exploratory analysis carried out to study the class properties and the structural properties that are affected due to the target class guided feature subsetting in specific. K-nearest neighbors and minimum spanning tree are employed to study the structural properties, and cluster analysis is applied to understand the target class and other class properties. The experimentation is conducted on the target class derived features on the selected bench mark data sets namely IRIS, AVIRIS Indiana Pine and ROSIS Pavia University data set. Experimentation is also extended to data represented in the optimal principal components obtained by transforming the subset of features and results are also compared
International Journal of Engineering Research and Applications (IJERA) aims to cover the latest outstanding developments in the field of all Engineering Technologies & science.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
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.
Unsupervised learning Algorithms and Assumptionsrefedey275
Topics :
Introduction to unsupervised learning
Unsupervised learning Algorithms and Assumptions
K-Means algorithm – introduction
Implementation of K-means algorithm
Hierarchical Clustering – need and importance of hierarchical clustering
Agglomerative Hierarchical Clustering
Working of dendrogram
Steps for implementation of AHC using Python
Gaussian Mixture Models – Introduction, importance and need of the model
Normal , Gaussian distribution
Implementation of Gaussian mixture model
Understand the different distance metrics used in clustering
Euclidean, Manhattan, Cosine, Mahala Nobis
Features of a Cluster – Labels, Centroids, Inertia, Eigen vectors and Eigen values
Principal component analysis
Supervised learning (classification)
Supervision: The training data (observations, measurements, etc.) are accompanied by labels indicating the class of the observations
New data is classified based on the training set
Unsupervised learning (clustering)
The class labels of training data is unknown
Given a set of measurements, observations, etc. with the aim of establishing the existence of classes or clusters in the data
Types of Hierarchical Clustering
There are mainly two types of hierarchical clustering:
Agglomerative hierarchical clustering
Divisive Hierarchical clustering
A distribution in statistics is a function that shows the possible values for a variable and how often they occur.
In probability theory and statistics, the Normal Distribution, also called the Gaussian Distribution.
is the most significant continuous probability distribution.
Sometimes it is also called a bell curve.
Nano Technology for UG students of AgricultureP.K. Mani
Brief introduction of Nano Science and Nanotechnology at UG level for the students of Agriculture. Smart delivery of Fertilizers pesticides, smart seed, nano biosensors etc dealt.
Geomorphology at a glance: Major landformsP.K. Mani
Geomorphology, Major landforms, Genetic landform classifications, Volcanic landforms, River Systems and Fluvial Landforms, Aeolian Landforms, Glacial Landforms
Geologic time scale, Uniformitarianism, Catastrophic concept, Geomorphic process-agent cause and product, Hutton's concept, Davis Concept, Darwin's concept, Gilbert's concept
COMPARATIVE ADVANTAGE OF SRI OVER TRANSPLANTED RICE IN TERMS OF YIELD A...P.K. Mani
Advantage of SRI over Conventionally Transplanted Rice are discussed on the following Parameters: Yield and Yield Attributing Characters, Water Productivity, Soil Properties, Nitrogen Use Efficiency ,Phosphorus and Potassium use efficiency, Ammonia Loss and Microbiological Properties.
Effect of minimum tillage and Mulching on nutrient Transformation in rice bas...P.K. Mani
Paper presented at PAU, LUdhiana, 2012 describing nutrient transformation in rice based cropping system following zero tillage vs conventional tillage.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
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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
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.
1. Image classification and Analysis
Dr. P. K. Mani
Bidhan Chandra Krishi Viswavidyalaya
E-mail: pabitramani@gmail.com
Website: www.bckv.edu.in
2. Image Processing and Analysis
Classification
• Bands of a single image are used to identify and separate spectral
signatures of landscape features.
• Ordination and other statistical techniques are used to “cluster” pixels of
similar spectral signatures in a theoretical space.
• The maximum likelihood classifier is most often used.
• Each cluster is then assigned to a category and applied to the image to
create a classified image.
• The resulting classified image can now be used and interpreted as a
map.
•The resulting classified image will have errors! Accuracy assessment is
critical. Maps created by image classification should report an estimate of
accuracy.
3. Image Processing and Analysis
3. Classification
Black
Box
Transformation / Clustering
Maximum Likelihood Classifier
Band 4
Spectral Signatures
Band 3
Band 2
Band 1
Classified Image (Map)
18. In order to make the classifier work with thematic (instead of
spectral) classes, some “knowledge” about the relationship
between classes and feature vectors must be given.
Therefore, classifications methods are much more widely
used, where the process is divided into two phases: a
training phase, where the user “trains” the computer, by
assigning for a limited number of pixels to what classes they
belong in this particular image, followed by the decision
making phase, where the computer assigns a class label to
all (other) image pixels, by looking for each pixel to which of
the trained classes this pixel is most similar.
During the training phase, the classes to be use are previously
defined. About each class some “ground truth” is needed:
19. Guidelines for selecting training areas:
· Training areas should be homogenous. This can be tested by graphic
histograms, numeric summaries, 2-band scatter plot for investigating
separability of feature classes by pairs of bands, 3-D plot of 3-band
feature space (if the softwareallows!).
· One large ‘uniform’ training area per feature class is preferable to
several smaller training areas, though this must depend upon the degree of
variability within each class from site to site, and degree of variability
within individual site.
· Easy to extract more than is needed, and then examine site statistics
before making decision.
· Each training area should be easily located in the image: use a
topographic map, nautical chart, or aerial photos to assist, though
differential GPS observations may help.
· If a smaller training area is necessary, then the minimum size is critical.
What should be the size of the training site?
· Note CCRS statement for MSS: individual training area should be
minimum of 3 - 4 pixels East-West by 6 pixels North-South.
· Others [e.g. Swain and Davis, IDRISI] state (10 x # bands used), e.g. area of
40 pixels if all four MSS bands used (or approx 6 pixels x 7 pixels).
20.
21. It is common to call the three bands as “features”. The term
features instead of bands is used because it is very usual to
apply transformations to the image, prior to classification.
They are called “feature transformations”, their results
“derived features”. Examples are: Principal components,
In one pixel, the values in the (three) features can be
regarded as components of a 3- dimensional vector, the
feature vector. Such a vector can be plotted in a 3dimensional space, called feature space. Pixels belonging to
the same (land cover) class and having similar characteristics,
end up near to each other in the feature space, regardless of
how far they are from each other in the terrain and in the
image. All pixels belonging to a certain class will (hopefully)
form a cluster in the feature space.
22.
23.
24.
25.
26. Supervised Classification
Supervised classification
requires the analyst to
select training areas where
he/she knows what is on the
ground and then digitize a
polygon within that area…
The computer then creates...Mean Spectral
Signatures
Conifer
Known Conifer
Area
Water
Known Water
Area
Deciduous
Known Deciduous
Area
Digital Image
28. The Result is Information--in this case a Land Cover map...
Land Cover Map
Legend:
Water
Conifer
Deciduous
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44. Multi spectral image classification is used to extract
thematic information from satellite images in a semi-automatic
way.
Image classification are based on the theory about
probabilities. Looking at a certain image pixel in M bands
simultaneously, M values are observed at the same time.
Using multi-spectral SPOT images, where M=3, three reflection
values per pixel are given.
For instance, (34, 25, 117) in one pixel, in another
(34,24,119) and in a third (11, 77, 51). These values found for
1 pixel in several bands are called feature vectors.
It can be recognized that the first two sets of values are
quite similar and that the third is different from the other two.
The first two probably belong to the same (land cover) class
and the third belongs to another one.
45. Unsupervised Classification
The analyst requests the computer
to examine the image and extract a
number of spectrally distinct
clusters…
Spectrally Distinct
Clusters
Cluster 3
Cluster 5
Cluster 1
Digital Image
Cluster 6
Cluster 2
Cluster 4
48. Unsupervised Classification
• Recall:
In unsupervised classification, the spectral
data imposes constraints on our interpretation
• How?
Rather than defining training sets and
carving out pieces of n-dimensional space, we
define no classes before hand and instead use
statistical approaches to divide the ndimensional space into clusters with the best
separation
• After the fact, we assign class names to those
clusters
50. Supervised Classification
• Parallelepiped/ Box
Approach
The Box classifier is the simplest
classification method: In 2-D space,
rectangles are created around the
training feature vector for each class;
in 3-Dimension they are actually boxes
(blocks).
The position and sizes of the boxes
can be exactly around the feature
vectors (Min-Max method), or
according to the mean vector (this will
be at the center of a box) and the
standard deviations of the feature
vector, calculated separately per
feature (this determines the size of the
box in that dimension).
51. Supervised Classification: Statistical Approaches
Minimum distance to mean
The Minimum Distance-to-mean
classifier:
first calculates for each class the
mean vector of the training
feature vectors.
Then, the feature space is
partitioned by giving to each
feature vector the class label of
the nearest mean vector,
according to Euclidean metric.
Usually it is possible to specify a
maximum distance threshold:
If the nearest mean is still further away than that threshold, it is
assumed that none of the classes is similar enough and the
result will be “unknown”
52. Gaussian Maximum Likelihood
classifiers assume that the
feature vectors of each class
are (statistically) distributed
according to a multivariate
normal probability density
function. The training samples
are used to estimate the
parameters of the distributions.
The boundaries between the
different partitions in the feature
space are placed where the
decision changes from one
class to another. They are
called decision boundaries.
53. Supervised Classification
• Maximum likelihood
– Pro:
• Most sophisticated; achieves good separation of
classes
– Con:
• Requires strong training set to accurately describe
mean and covariance structure of classes
54.
55. Classification: Critical Point
• LAND COVER not necessarily equivalent to
LAND USE
– We focus on what’s there: LAND COVER
– Many users are interested in how what’s there
is being used: LAND USE
• Example
– Grass is land cover; pasture and recreational
parks are land uses of grass