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Optimal Parameter Selection for High Accuracy Area Classification in Hyper Spectral and Landsat-8 Imagery With Seasonal Change Detection

Thesis Info

Access Option

External Link

Author

Pervez, Wasim

Program

PhD

Institute

National University of Sciences & Technology

City

Islamabad

Province

Islamabad

Country

Pakistan

Thesis Completing Year

2017

Thesis Completion Status

Completed

Subject

Electrical Engineering

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/14040/1/Wasim_Pervez_Electrical_Engineering_2017_HSR_NUST_11.01.2018.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727803242

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The thesis proposes area classification after construction of datasets with pre-processing for Hyperion Hyperspectral, Operational Land Imager (OLI) and Advanced Land Imager (ALI) orthoimages. The techniques perform comparative analysis of Hyperion Hyperspectral, OLI and ALI orthoimages in terms of high Signal to Noise (SNR), spectral band configuration, technical superiority, improved system design and high radiometric resolution. The thesis further proposes criteria for selection of parameters like gamma parameter, penalty parameter, pyramid parameter and classification probability threshold to achieve higher classification accuracies of Hyperion Hyperspectral, OLI and ALI Satellite orthoimages by using Support Vector Machine (SVM), Spectral Angle Mapper (SAM) and Spectral Information Divergence (SID) classifiers. After performing the comparison, the thesis selects SVM as the most appropriate classifier in terms of overall accuracy, individual classes and the best orthoimagery i.e. Hyperion, OLI and ALI respectively. The thesis also presents application of classification accuracy assessment on Hyperion Hyperspectral, OLI and ALI orthoimages by using different classifiers i.e. SVM, SAM and SID. The thesis also proposes high accuracy based seasonal change detection analysis technique on Hyperion Hyperspectral, ALI and different datasets of OLI by using change detection matrix and difference maps. As a result of these contributions, 1x Journal and 6 x Conference papers duly peer reviewed have been published. The pre-processing of 242 bands of hyperspectral data results in 136 calibrated bands. Quick Atmospheric Correction (QUAC) are applied to Hyperion Hyperspectral and Fast Line-of-sight Atmospheric Analysis of Hyper cubes (FLAASH) are applied to OLI and ALI imagery respectively for atmospheric correction. Principal Component Analysis (PCA) is used for dimensional reduction of the hyperspectral data. PCA reveals that 99.94% of the hyperspectral data are contained in the first 15 Principal Components (PCs). Distinct spectral profiles are identified for all classes which are highly beneficial for feature identification and classification of images. Novel parameters are selected for high accuracy area classification in hyperspectral, OLI and ALI imagery via SVM, SAM and SID classification techniques. High accuracy based post classification change detection analysis is used on Hyperion Hyperspectral, ALI and different OLI datasets to produce difference maps which provide information not only about change of category but also type of change i.e. “from-to” of category of classes. Change detection matrix is also used which shows an overall decrease and increase of corresponding spatial extension of classes whereas diagonal elements of the change detection matrix show the unchanged pixels for the individual classes. The post classification technique is selected because of its ability for accurate change detection analysis of imagery of different sensors and its advantages over pre-classification methods that it compensates for variation in atmospheric correction and in conditions where the change is limited due to small rate of change. The results show that Hyperion hyperspectral and Landsat-8 OLI data achieved higher accuracies in mapping applications and high accuracy based post classification seasonal change detection analysis on different datasets on OLI results extraction of accurate change detection information as compared to previous Landsat satellite series.
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تقریظ اوّل

تقریظ اوّل
بسم اللہ الرحمن الرحیم
نحمدہٗ و نصلی علی رسولہِ الکریم
محترم حافظ محمد اکرم راشد ؔصاحب جو ایک علمی گھرانے کے چشم و چراغ ہیں اور اپنی اس وارثت کو جو علم کی صورت میں انہیں اپنے آباء واجداد سے ورثے میں ملی ہے تشِنگانِ علم کو منتقل کرنے کے لئے ہمیشہ کوشاں رہتے ہیں ۔ تدریس ہو، تقریر ہو ، تحریر ہو ، میدانِ کتابت ہو پیش پیش دکھائی دیتے ہیں ۔ بہائو الدین زکریا یونیورسٹی سے ایم۔اے عریبک میں گولڈ میڈل حاصل کیا ہے جو ہمارے علاقہ کے لئے اعزاز ہے ۔ انہوں نے ’’ نگارشات ِراشد‘ ‘ کے نام سے ایک فقید المثال کتاب تصنیف فرمائی ہے جس کا میں نے بالا سیتعاب مطالعہ کیا ہے ۔
کتاب ’’ نگارشاتِ راشد‘‘ جو مضامین پر مشتمل ہے اور اپنے اندر ندرت لیے ہوئے ہے یہ کتاب اپنے موضوع اور کتابت دونوں کے اعتبار سے نابغۂ روزگار ہے ۔ اس میں عوام النّاس کے لیے بالعموم اور طلباء کے لیے بالخصوص علمی مواد موجود ہے ۔ طلباء کے لیے ترغیبی انداز اختیار کیا گیا ہے ، مختلف موضوعات پر موصوف نے اختصار مگرجامع انداز اختیا ر کیا ہے ، اور یہ مقالات اپنے اندر علم و آگہی کا ایک وافر سامان لیے ہوئے ہیں ، موصوف چونکہ مختلف جرائد اور روزناموں میں اپنی تحریر کے گُل کھِلا تے رہتے ہیں اس لیے آپ کی اس کتاب ’’نگارشاتِ راشد‘‘ میں قاری کا تجسّس بڑھتا جاتا ہے اور صاحبِ تحریر کا جذبہ خدمت خلق پروان چڑھتا ہوا دکھائی دیتا ہے ۔ مختلف موضوعات پر مقالات تحریر کر کے طالب علم کی ضرورت کو پورا کرنے کی ہر ممکن کوشش کی گئی ہے ۔ اِن کی مذکورہ کتاب مصنّف کے علمی تبحر کی گواہ ہے ۔ اللہ تعالیٰ اِن کی اس کاوش کو مقبول فرمائے۔
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Arrhythmias after Implantation of the Left Ventricular Assisted Device Arrhythmias after Implantation of the Left Ventricular Assisted Device

Cardiac arrhythmias has been frequently reported after left ventricular assist devices implantation but currently literature shows no sufficient information on cardiac arrhythmias. Objective: The aim of this study was to assess the frequency and other features of ventricular and supra ventricular ectopic beats ((SVEB), atrial fibrillation (AF)/flutter (AFL) post device implantation. Methods: This is a retrospective study conducted in Department of Cardiac-Surgery, University of Verona Medical School, Verona, Italy from June 2014-September 2016. Rhythm monitoring and registration were collected from 16 patients (13 males; 45±13years) during the first five (05) days after implantation. To assess late post-operative rhythm, patient’s hospital electronic records were used as well asfunctional hemodynamic parameters including mean arterial pressure(MAP), right atrial pressure(RAP), heart rate(HR) and ST-deviation(d-ST). Results: Ventricular arrhythmia (n=9), atrial fibrillation (n=5) or atrial flutter (n=2) episodes were preoperatively present in 11 patients. Postoperatively, 5 patients developed either VT (n=2), AF (n=1) or both VT/AF (n=2) during a follow-up of 18±14 months. Prior to postoperative VT (POVT) episodes (n=123), MAP decreased, HR, d-ST increased and RAP remained unaltered. POVT were initiated either by single VEBS (28%), V-couplets (15%), V-run (46%) or occurred suddenly (11%). Conclusions: Ventricular and supraventricular arrhythmias are common after device implantation. The frequency of sustained VTA was less at early phase as compared to late postoperative phase.

Identification and Analysis of Factors Hampering Women Empowerment in Agricultural Decision Making and Extension Work in the Punjab, Pakistan: A Case Study of District Okara

Women in Pakistan comprised almost half of total population and their participation rate in agricultural sector is about 70 percent. Pakistani women actively participate in agriculture and contribute in all areas including production of crops, livestock management etc., along with normal domestic chores. Despite expanding role of women in agricultural sector, extension services in Pakistan are limited to men than women. The investigation was designed to measure the position and contribution of rural women, their constraints in decision making regarding agricultural activities and mainly how the rural women can be empowered for sustainable agricultural development in the district Okara, Punjab, Pakistan. It was envisioned that women participation in extension activities has rarely been investigated. A multistage random sampling technique was used to collect the data from 480 respondents from three Tehsils of the district. From each Tehsil, eight villages were taken by using simple random sampling technique. Twenty farm families were selected from each selected village at random and one woman was further selected randomly from each selected household. So, 480 farm families made a total of 480 respondents for the study. The results show that a vast majority of women were illiterate, having monthly family income less than one lac, having small land farms, and living in joint family system. A large proportion of the respondents reported that they had to face problems and constraints in accessing agricultural extension services in the context of social, economic, cultural, and political issues. Bivariate analysis indicated that education level of women, income of household, family type were significantly associated with the selected variables of constraints women faced in decision making process and their participation conditions in that process. Some variables showed strong association e.g. education of women. Ownership of land by women depicted strong significant with majority of the selected variables. However, addressing theses constraints effectively the situation of women empowerment can be improved in rural areas. If they would be empowered financially and economically they would become independent in their decisions, which can play a vital role to empower women.