Estimate Building Square Footage Using LiDAR and Building Footprints Grace Chung Ed Schafer.
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Transcript of Estimate Building Square Footage Using LiDAR and Building Footprints Grace Chung Ed Schafer.
![Page 1: Estimate Building Square Footage Using LiDAR and Building Footprints Grace Chung Ed Schafer.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649c7c5503460f9493147f/html5/thumbnails/1.jpg)
Estimate Building Square Footage Using LiDAR and Building Footprints
Grace ChungEd Schafer
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• Why?– There is missing data on building square footage.
• What PECAS needs?– Ideally, PECAS needs building square footage for
all residential and non-residential buildings in the region by parcel.
– For non-residential buildings, PECAS needs to match square footage to number of employees.
![Page 3: Estimate Building Square Footage Using LiDAR and Building Footprints Grace Chung Ed Schafer.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649c7c5503460f9493147f/html5/thumbnails/3.jpg)
![Page 4: Estimate Building Square Footage Using LiDAR and Building Footprints Grace Chung Ed Schafer.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649c7c5503460f9493147f/html5/thumbnails/4.jpg)
Building top (from LiDAR DSM)
Ground Elevation (from LiDAR DEM)
Building Height
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LIDAR Data Collection
City of San Diego, 2005
City of Chula Vista, 2005, partial
North County Consortium, 2009
Poway
Carlsbad
Oceanside
Escondido
Santee
San Marcos
Encinitas
Vista
Imperial Beach
Chula Vista
Del Mar
Lemon Grove
National City
Solana Beach
Coronado
El Cajon
La Mesa
San Diego
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Building Footprints Collection
San Diego
Poway
Carlsbad
Oceanside
Escondido
Santee
San Marcos
Encinitas
Vista
Imperial Beach
Chula Vista
Del Mar
Lemon Grove
National City
Solana Beach
Coronado
El Cajon
La Mesa
![Page 7: Estimate Building Square Footage Using LiDAR and Building Footprints Grace Chung Ed Schafer.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649c7c5503460f9493147f/html5/thumbnails/7.jpg)
Building Height Extraction
San Diego
Poway
Carlsbad
Oceanside
Escondido
Santee
San Marcos
Encinitas
Vista
Imperial Beach
Chula Vista
Del Mar
Lemon Grove
National City
Solana Beach
Coronado
El Cajon
La Mesa
![Page 8: Estimate Building Square Footage Using LiDAR and Building Footprints Grace Chung Ed Schafer.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649c7c5503460f9493147f/html5/thumbnails/8.jpg)
.LAS Multipoint DSM/ Surface (.grd)
2’ contour lines DEM/ Ground Surface (.grd)
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City of Poway
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Scripps Poway Pkwy
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DSM
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Max Bldg Top HeightMin Bldg Top HeightAvg Bldg Top Height
DSM
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DEM
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Max Ground ElevationMin Ground ElevationAvg Ground Elevation
DEM
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Max Bldg HeightMin Bldg HeightAvg Bldg Height
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Estimating Floor Area
• How do we go from footprint and height to floor area?• Most buildings at linear
– Rectangular footprint– Regular (or semi-regular) height– Uncertainty lies with the interior layout
• Use multiple linear regression Est(FA) = B1*FP + B2*H– Where EST(FA) is estimated floor space– FP is footprint in square feet– H is height in feet– B1 is coefficient relating footprint to floor area– B2 is coefficient relating height to floor space
• No need for an intercept
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Regression Results
• Poway / Industrial• First model
– LU = 2101 (industrial park)– N = 51– AdjR-square = .972 p = .000– B1 = 1.232 p = .000– B2 = -62.758p = .489
• Second model– LU = 2101 (industrial park)– N = 51– AdjR-square = .972 p = .000– B1 = 1.208 p = .000
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Regression Results
• Poway / Retail• First model
– LU = 5003, 5004, 5007– N = 74– AdjR-square = .845 p = .000– B1 = 1.022 p = .000– B2 = 96.142 p = .193
• Second model– LU = 5003, 5004, 5007– N = 74– AdjR-square = .843 p = .000– B1 = 1.062 p = .000