Journal ArticleDOI
Night Sky Brightness Assessment in Nigeria Using Environmetric and GIS Technique
Musa Garba Abdullahi,Mohd Khairul Amri Kamarudin,Roslan Umar,Azizah Endut,Saiful Iskandar Khalit,Hafizan Juahir +5 more
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TLDR
In this paper, the authors measured the night sky brightness at the most densely populated urban centers of Nigeria; to estimate and quantify the level of the sky brightness from the sites nearby the cities of the planned research study, which showed three clusters in which class 1 has low pollution; class 2 is moderate while class 3 has high pollution status.Abstract:
High anthropogenic activities are rapidly increasing phenomenon and it is assumed to have global implications. In Nigeria, high anthropogenic activities rapidly increase above the standard of the threshold values especially the lighting sources. This increase due to the vastly growing of industries, residential and commercial uses and other sources such as street lighting in urban and semi-urban areas, which can make the night sky brightness in the area above the threshold set for polluted status. The study measures the night sky brightness at the most densely populated urban centers of Nigeria; to estimate and quantify the level of the night sky brightness from the sites nearby the cities of the planned research study. The research monitored the zenith sky brightness from November 2015 to March 2016 using Sky Quality Meter (SQM). However, typical values ranging from 20.14 to 22.00Mag.sqm /arc sec.2 were measured at different sites of the study area. This data recorded in the field was analyzed using Agglomerative Hierarchical Method via Ward’s Methods to cluster our data according to the pollution status of the areas. Result showed three clusters in which class 1 has low pollution; class 2 is moderate while class 3 has the high pollution status. The sites classified in class 3 are more polluted due to the high use of artificial light. However, geographical information system (GIS) software was employed to confirm the results obtained from environ-metric technique and concluded that this result is confirmed to be the same. Hence, it illustrated that sites in cluster 1 have an excellent dark location that can be used to build optical observatory stations and other astronomical observations due to their dark sky.read more
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Journal ArticleDOI
Development of Spatial Distribution Model using GIS to Identify Social Support Index Among Drug-Abuse Inmates
Mahadzirah Mohamad,Mohd Khairul Amri Kamarudin,Hafizan Juahir,Nor Azman Mat Ali,Fazida Karim,Nurhikmah Badarilah,Norhilmi Muhammad,Muhammad Syaakir Mohd Ridzuan +7 more
TL;DR: In this article, the spatial distribution of social support index (SSI) among drug-abuse inmates throughout Peninsular Malaysia was identified by using Factor Analysis (FA) and Discriminant Analysis (DA).
Journal ArticleDOI
How to measure light pollution - a systematic review of methods and applications
TL;DR: In this paper , the authors present a systematic review of 140 articles on light pollution measurement tools used in each context, comprehensively discussed, gaps are identified in current techniques, and benchmarking information is provided to aid future research.
Journal ArticleDOI
Spatial Model of Sky Brightness Magnitude in KUSZA Observatory, UniSZA
Roslan Umar,Wardatul Jannah Awang,Siti Nadhirah Berzanji,Nur Farhana Abd Majed,Mohd Khairul Amri Kamarudin,Musa Garba Abdullahi +5 more
TL;DR: In this paper, the sky brightness of the KUSZA Observatory in Merang, Setiu, Terengganu, Malaysia was monitored using SQM device and the results obtained were used to compare with simulation data generated from Earth Observation Group (EOG) of National Oceanic and Atmospheric Administration (NOAA), National Geophysical Data Center.
Journal ArticleDOI
Soil NPK Variability Mapping for Harumanis Mango Grown in Greenhouse at Perlis, Malaysia
Fathin Ayuni Azizan,Nurmardhiyah Roslan,Rashidah Ruslan,Aimi Athirah Aznan,Ahmad Zulfadzli Mohamed Yusoff +4 more
TL;DR: In this paper, the available content of Nitrogen (N), Phosphorus (P) and Potassium (K) were determined for a high-density planting systems of Harumanis mango plants grown in the greenhouse.
References
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TL;DR: In this paper, the authors developed interpolated climate surfaces for global land areas (excluding Antarctica) at a spatial resolution of 30 arc s (often referred to as 1-km spatial resolution).
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Finding Groups in Data: An Introduction to Chster Analysis
TL;DR: This book make understandable the cluster analysis is based notion of starsmodern treatment, which efficiently finds accurate clusters in data and discusses various types of study the user set explicitly but also proposes another.
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On Clustering Validation Techniques
TL;DR: The fundamental concepts of clustering are introduced while it surveys the widely known clustering algorithms in a comparative way and the issues that are under-addressed by the recent algorithms are illustrated.
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The first World Atlas of the artificial night sky brightness
TL;DR: The first World Atlas of the zenith artificial night sky brightness at sea level is presented in this article, based on radiance-calibrated high-resolution DMSP satellite data and on accurate modelling of light propagation in the atmosphere.