Transcript NWGIS_Liddell_Bishop_Rooftop_Solar_from_LIDAR

Estimating Rooftop Solar Electricity
Potential in Seattle from LiDAR Data
Ryan M. Liddell
Joseph A. Bishop, Ph.D.
Photo Copyright H Brothers Inc; used by permission.
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Ryan M. Liddell
www.personal.psu.edu/rul135
www.bv.com
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Joe Bishop
• Research Associate - Geospatial
Coordinator
• Riparia, a Center where science
informs policy and practice.
• Department of Geography – Penn
State University
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Presentation Outline
• Project Objectives
• Workflow
• Results
• Discussion
• Questions
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Project Objectives
• Experience utilizing LiDAR data and
associated software for analysis
• Estimate total rooftop solar electricity potential
in Seattle using LiDAR data as only input
• Develop methodology that could be used
anywhere LiDAR data is available
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Estimating PV Production Potential
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Software
• ESRI ArcGIS 10 Desktop (ArcInfo)
• ESRI ArcGIS 10 extensions:
• 3D Analyst
• Spatial Analyst
• LiDAR Analyst 5.0 for ArcGIS by
Overwatch Geospatial
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Computer Specs
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HP Pavilion dv7 Notebook PC
Intel® Core™ i5 CPU M [email protected]
6GB RAM
Windows 7 (64-bit) Home Premium
700 GB hard drive
Filled ≈ 220 GB during project
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Estimating PV Production Potential
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Public Domain LiDAR Data for the
City of Seattle
Puget Sound LiDAR Consortium (PSLC)
• Flown in 2000 & 2002
• Nominal pulse rate: 1 per m2
• Bare Earth and Top Surface DEMs: 6ft res
• All-Returns ASCII files
Source: Puget Sound LiDAR Consortium.
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Processing PSLC ASCII Files
• 270 text files covering the City of Seattle
• Divided City into 9 subareas
• Converted to shapefiles using ArcGIS 3D
Analyst (ASCII 3D to Feature Class)
• Shapefiles converted to LAS using LiDAR
Analyst extension for ArcGIS from
Overwatch Geospatial
• LAS files converted to All-Returns DEMs
using LiDAR Analyst
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Estimating PV Production Potential
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Extract Bare Earth from All-Returns DEM
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Extract Buildings from All-Returns DEM
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Estimating PV Production Potential
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Area Solar Radiation from All-Returns DEM
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Determining Tool Parameters
• National Renewable Energy Laboratory
(NREL) www.nrel.gov/
• National Solar Radiation Database
• PVWatts
• System Advisor Model (SAM)
https://www.nrel.gov/analysis/sam/
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Estimating PV Production Potential
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Estimate of Rooftop Solar Electricity
Potential for Seattle
• 26,094,106,258 kWh per year
• Assume 30% of rooftop space is unusable
• Efficiency of energy conversion – 18%
• DC to AC derate factor: 0.77
2,531,650 Mwh
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Discussion
• Method for identifying unsuitable rooftop
space using higher res LiDAR
• Advancements in PV technologies to
capture solar energy
• Limitations of infrastructure and energy
storage – how can we best utilize solar
resources?
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Special Thanks
• Overwatch Geospatial
• Eric Thomas at Solar Epiphany LLC
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Questions
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