Assessment of Land Degradation Status and Its Impact in Arid and Semi-Arid Areas by Correlating Spectral and Principal Component Analysis Neo-Bands

2016 ◽  
Vol 5 (1) ◽  
pp. 1539-1560 ◽  
Author(s):  
Alfred Homère Ngandam Mfondoum ◽  
◽  
Joachim Etouna ◽  
Buji Kindess Nongsi ◽  
Fabrice Armel Mvogo Moto ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
Land Degradation ◽  
Principal Component ◽  
Component Analysis ◽  
Arid Areas ◽  
Semi Arid

scholarly journals Morphometric analysis of river subwatersheds using geographic information system and principal component analysis, northeast of Algeria

2017 ◽  
Vol 19 (1) ◽  
pp. 155-172 ◽  
Author(s):  
KHANCHOUL Kamel ◽  
SAAIDIA Bachir
Keyword(s):  
Principal Component Analysis ◽  
Land Degradation ◽  
Principal Component ◽  
Component Analysis ◽  
Drainage Density ◽  
Morphometric Parameters ◽  
Geomorphic Parameters ◽  
Stream Frequency ◽  
Basin Area ◽  
Relief Ratio

In the present paper an attempt is made to study the morphometric characteristics of five watersheds which are part of Seybouse and Coastal basin of Constantine located in northeast of Algeria. The study focuses on evaluating the effect of morphometric parameters on land degradation. The Geographical Information Systems which represent efficient tools in determination of drainage basin morphometric properties and principal component analysis are applied to ten geomorphic parameters on twenty subwatersheds, to group the parameters under different components based on significant correlations. Some morphometric parameters are computed and analyzed such as basin area, drainage density, stream frequency, form factor, orographic coefficient, hypsometric integral, and lithology index, basin slope, average overland flow distance, basin relief ratio. Outcomes of the matrix of correlation and principal component analysis of ten geomorphic parameters clearly depict that fifty percent of the variables are strongly correlated with the components like basin area, drainage density, stream frequency, orographic coefficient and relief ratio. It has been found that Guis sub-basin, three sub-basins of the Saf Saf watershed and all the sub-basins of the Mellah watershed are subjected to high land degradation, thus, creating an urgent need for applying soil and water conservation measures.

scholarly journals Faktor yang berpengaruh terhadap kinerja sistem irigasi di Wilayah Semi Arid Pulau Timor melalui pendekatan principal component analysis

2019 ◽  
Vol 14 (2) ◽  
pp. 89
Author(s):  
Ida Nurwiana
Keyword(s):  
Principal Component Analysis ◽  
Principal Component ◽  
Component Analysis ◽  
Semi Arid

Sistem irigasi merupakan sistem yang sangat kompleks, meliputi air irigasi, daerah irigasi, prasarana fisik irigasi, sumber daya manusia, kelembagaan irigasi, manajemen, pembiayaan, teknologi partisipasi petani/P3A yang saling terkait untuk menunjang pertanian. Untuk meningkatkan produksi pertanian, upaya-upaya yang dilakukan perlu dirumuskan dengan memerhatikan kinerja sistem irigasi dan pengaruh setiap faktor terkait. Penelitian ini bertujuan menganalisis faktor yang berpengaruh terhadap kinerja sistem irigasi daerah irigasi kewenangan kabupaten/kota, provinsi, pemerintah (pusat) di wilayah semi-arid Pulau Timor melalui pendekatan Principal Component Analysis (PCA). Metode analisis komponen utama menggunakan lima belas indikator dari data 345 daerah irigasi. Studi ini menyimpulkan lima belas variabel menunjukkan hubungan signifikan baik positif maupun negatif terhadap kinerja sistem irigasi. Urutan kontribusi terbesar memengaruhi kinerja sistem irigasi dalam model komponen utama adalah aspek kelembagaan, kewenangan daerah irigasi, produktivitas padi, ketersediaan sarana penunjang operasi dan pemeliharaan, tingkat kerusakan saluran pembuang, tingkat kerusakan saluran sekunder dan tingkat kerusakan saluran primer. Intensitas pertanaman total menunjukkan hubungan negatif terhadap kinerja sistem irigasi di wilayah semi-arid dengan keterbatasan air. Sementara itu, luas daerah irigasi, produktivitas padi, tingkat partisipasi petani pemakai air, ketersediaan sarana penunjang operasi dan pemeliharaan, rasio tenaga operasi dan pemeliharaan terhadap luas daerah irigasi, frekuensi pemeliharaan bangunan dan saluran, biaya operasi dan pemeliharaan, biaya rehabilitasi, kewenangan daerah irigasi provinsi menunjukan hubungan positif terhadap kinerja sistem irigasi.

A German version of the Intermittent Claudication Questionnaire (ICQ): cultural adaptation and validation

VASA ◽  
2012 ◽  
Vol 41 (5) ◽  
pp. 333-342 ◽  
Author(s):  
Kirchberger ◽  
Finger ◽  
Müller-Bühl
Keyword(s):  
Principal Component Analysis ◽  
Intermittent Claudication ◽  
Completion Time ◽  
Short Form ◽  
Principal Component ◽  
Component Analysis ◽  
German Version ◽  
Average Completion Time ◽  
Sf 36 ◽  
Related Quality

Background: The Intermittent Claudication Questionnaire (ICQ) is a short questionnaire for the assessment of health-related quality of life (HRQOL) in patients with intermittent claudication (IC). The objective of this study was to translate the ICQ into German and to investigate the psychometric properties of the German ICQ version in patients with IC. Patients and methods: The original English version was translated using a forward-backward method. The resulting German version was reviewed by the author of the original version and an experienced clinician. Finally, it was tested for clarity with 5 German patients with IC. A sample of 81 patients were administered the German ICQ. The sample consisted of 58.0 % male patients with a median age of 71 years and a median IC duration of 36 months. Test of feasibility included completeness of questionnaires, completion time, and ratings of clarity, length and relevance. Reliability was assessed through a retest in 13 patients at 14 days, and analysis of Cronbach’s alpha for internal consistency. Construct validity was investigated using principal component analysis. Concurrent validity was assessed by correlating the ICQ scores with the Short Form 36 Health Survey (SF-36) as well as clinical measures. Results: The ICQ was completely filled in by 73 subjects (90.1 %) with an average completion time of 6.3 minutes. Cronbach’s alpha coefficient reached 0.75. Intra-class correlation for test-retest reliability was r = 0.88. Principal component analysis resulted in a 3 factor solution. The first factor explained 51.5 of the total variation and all items had loadings of at least 0.65 on it. The ICQ was significantly associated with the SF-36 and treadmill-walking distances whereas no association was found for resting ABPI. Conclusions: The German version of the ICQ demonstrated good feasibility, satisfactory reliability and good validity. Responsiveness should be investigated in further validation studies.

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