Implementation of Open Source GIS Tools to Identify Bright Rooftops for Solar Photovoltaic Applications – A Case Study of Creek Lanes, DHA, Karachi

Journal of Basic and Applied Sciences

Mudassar Hassan Arsalan2¹  Jibran Khan²  2¹ 

[1] 2Geoinformatics & Sustainable Development Research Lab, Institute of Space and Planetary Astrophysics (ISPA), University of Karachi, Main University Road, Karachi-75270, Pakistan;Department of Basic Sciences, Dawood University of Engineering & Technology, M.A. Jinnah Road, Karachi-74800, Pakistan

关键词: Solar PV;    QGIS;    Karachi;    electricity generation;    rooftops;   

DOI  :  

学科分类：生物科学（综合）

来源: Lifescience Global

【 摘 要 】

ThemegacityofKarachiisstillmainlydependentonconventionalsourcesofenergytocateritsdailyelectricityrequirements.Dependenceonconventionalsourcesofenergyforpowerproductionresultsinenvironmentaldegradationanddepletionoffossilfuelresources.Inparticular,italsohighlightsanimmenseneedofalternatesustainablesolutionforcurrentelectricitygenerationscenario.Inthisresearchwork,aninnovativemethodologyhasbeenproposedtoidentifybrightrooftopsusingopensourcegeographicinformationsystem(GIS)toolswhichmaybeutilizedforsustainablepowergenerationinKarachimetropolis.First,brightrooftopshavebeenextractedusingopensourceQuantumGIS(QGIS)software.Edgeextractiontechniqueusinggradientfilter;anopensourcealgorithmofQGIShasbeenutilized.Furthermore,imageprocessingtechniqueshavebeenusedtoextractandrefinebuildingrooftops.Then,rooftopshavebeenpolygonizedandtheirareahasbeencalculatedusingMeasureAreafunctionofQGIS.Toassesstheaccuracyoftheextractedrooftops,fieldvalidationworkhasbeenperformedandsamplerooftopshavebeenphysicallymeasured.Acomparisonofextractedandphysicallymeasuredsamplerooftopsyielded90.45%accuracy.Reductionintotalroofareahasbeenmadeconsideringdifferentroofusesandshadingeffectfromnearbytreesandbuildings.Then,unshadedbrightrooftopsareaof4,626m2hasbeencalculatedwhichcanbeusedforsolarphotovoltaic(PV)applicationsinCreekLanes,DHAPhase7Karachi.Anannualenergyoutputof2.1MWhhasbeenestimatedusingCrystallineSilicon(c-Si)solarPVpanelandavailablerooftoparea.Themethodologyadoptedcanbeextrapolatedtomacro-scaleaswell.However,challengesandlimitationsforextrapolationofmethodologyhavealsobeenhighlighted.SolarradiationstudiesthatdemonstratetheuseofopensourceGIStoolsforsustainablepowergenerationforthisregionhavebeenscarce.Thus,thisstudyisapreliminaryresearchworktohighlightanimmensesolarelectricitypotentialthatexistsforKarachimetropolis.

【 授权许可】

Unknown