Development of Building Inventory
Data in Lima

Group 4
Hiroyuki Miura (Tokyo Tech.)
Saburoh Midorikawa (Tokyo Tech.)
Yusuke Hirano (Tokyo Tech.)

G4: Geo-Spatial Database and Damage Assessment
Development of Geo-Spatial DatabaseDamage Detection using Satellite Images
Damage Assessment for Scenario Earthquakes

2.5m DEM byALOS/PRISM

Damage Assessment for Scenario Earthquake
Scenario earthquake

Building type

Source model and
Amplification map

Constructionand Height

Estimation ofground motion

Evaluation ofvulnerability

Building inventory

Number of buildings

Estimation of damage ratio

Estimation of distribution ofdamaged buildings

Existing Census Data in Lima
Census 2007 Data in Lima
The census GIS data contains number ofhouseholds for each building type inevery city block of Lima city.

Individual house

Apartment house“Quinta” house

Tenement house

It does NOT contain number of buildings
and building height information that arenecessary for damage assessment.

Cabin house

Non-residential building

Temporary house

Others (Vehicle etc.)

Ancillary Remote Sensing Data
Number of building and building height are estimatedby using ancillary remote sensing data.

Digital Surface Model (DSM)

High-Resolution Satellite Image

Created from ALOS/PRISM images
Spatial resolution = 2.5m

WorldView-2 satellite image
Spatial resolution = 0.5m

For estimation of building height

For estimation of number of building
and building height

Field Survey for
Building Inventory

7-story
apartment
12 households
Under construction

72-story
Individual
5 households

2-story
Individual
1 household

2-story
Individual
1 household

81096-21192-story
Quinta12 households

87610

126-1
12513

We conducted field survey in
Lima on 19-28 Sep, 2011 tocollect building information(number of buildings, households,
building use and building height)
for several residential areas.
Satellite image with ground photos
and surveyed building information

2-story
Individual
1 household

1154

2

317-story
Apartment
32 households

13

12-story
Quinta9 households

4

2-story
Individual
2 households

8-story
Apartment
14 households

3

13-story
Apartment
36 households

220-story
Apartment
57 households

1

16-story
Apartment
15 households

Comparison of Census Data and Field Survey
Individual house
CensusApartment house

Field survey

CensusField survey

Quinta house
CensusField survey

Households

House
holds

Num.
buildings

Households

House
holds

Num.
buildings

Households

House
holds

Num.
buildings

Miraflores-1

32105141

154

5-

21

2

Miraflores-2

17

1010

121

140

8-

-

-

Miraflores-3

15

14

10

139

152

1

66

1

San Borja

1918

13

32

49

8-

-

-

La Perla-1

76

84

52

31

275-

-

-

La Perla-2

38

34

26

4

61-

--

Callao

32

36

34

14

16

3

810-121Comparable number of households between census data and field survey
Individual house : 1 households ≒ 1 building
Quinta house : 8 households ≒ 1 building
Apartment house : Number of households / building depends on
size and height of building

Building Height and Building Size
820100642

1 2 3 4 5 6 7 8 9 10

Number階数of stories010
戸建（48棟）
最大値：637.2㎡
最小値：35.1㎡ 2
平均値：177.0㎡
標準偏差：97.2㎡

Ave.=177m

8

建物数

Number建物数of buildings

Apartment

14106
486

共同住宅（32棟）
最大値：390.7㎡

最小値：24.6㎡2
Ave.=177m
平均値：177.1㎡

標準偏差：98.2㎡

42202 4 6 8 10 12 14 16 18 20 22

Number階数of stories

Individual12共同住宅（32棟）
2階建：2棟（6.3％）
3階建：7棟（21.9％）

100 200 300 400 500 600 700 0 100 200 300 400 500 600 700
1世帯あたりの延床面積（㎡）
1世帯あたりの延床面積（㎡）

Floor area /household (m2)

Floor area /household (m2)

20
16
12戸建
（2，3階建：41棟）
最大値：534.5㎡
2-3story
最小値：17.6㎡
2
平均値：114.6㎡
Ave.=115m
標準偏差：86.9㎡

8Apartment
54

建物数

30

戸建（48棟）
2階建：36棟（75.0％）
3階建：5棟（10.4％）

Individual
Number建物数of buildings

Apartment
10

建物数

Number建物数of buildings

Individual
4021403共同住宅（2，3階建：9棟）
最大値：763.8㎡
2-3story
最小値：73.8㎡
2
平均値：309.6㎡
Ave.=310m
標準偏差：213.1㎡

100 200 300 400 500 600 700 800

建築面積（㎡）
Buildingarea (m2)0100 200 300 400 500 600 700 800

建築面積（㎡）
Buildingarea (m2)

Number of stories
1-story = Individual
Over 4-story = Apartment
For 2-3 story building
Building area < 100m2 = Individual
Building area > 100m2 = Apartment
Number of households can becalculated by floor area/household of
180m2.

Building Height Estimation from DSM
Digital Surface Model
Window area (80x80m)
Lowest pixel in window area
≒Ground heightDifference of target pixel
and lowest pixel

Estimated Building Height(m)80Building height estimation

DSMHeight estimation≦10m（27Bldg）±10～±20m（15Bldg）≧±20m以上（20Bldg）

60

40

200

WV2 image204060Measured Building Height(m)80

It is difficult to accurately
estimate building height fromanalysis of 2.5m-resolution
DSM.

Building Height Estimation from Satellite Image
Shadow length

Building

・Measured height：33.6m
・Estimated height
16.1m×tan64.3＝33.5m

Estimated Building Height (m)

80

60

40

200204060

80

Measured Building Height (m)Building height is estimated from shadow length in high-resolution satellite image.

The building heights are more accurately estimated.

Estimation of Number of Buildings
For Individual house and Quinta house
Estimated from relation between households and buildings
 Individual : No. of building = No. of household Quinta : No. of building = No. of household / 8
For mid- and high-rise apartment house
No. of building, height and building area are detected fromhigh-resolution satellite image
Floor area is calculated from height and building area
No. of households is estimated fromfloor area / household of 180m2
For low-rise apartment house
No. of household for low-rise apartment house= Census data (apartment) - households of high-rise house
No. of building = No. of households / 4

Validation of Estimation
Estimated numberof buildings

High-resolution
satellite image

Comparison of estimationand visual interpretation
Estimated Number of Building

60■：50■：30-50■：20-30■：10-20■：No data

50
4030
20
100102030
4050
Number of Building

Residential area in San Borja

Number of buildings are accurately estimated by the proposed procedure60Concluding Remarks and Future WorksA procedure to estimate number of buildings and buildingheight for mid- and high-rise buildings is developed basedon the existing census data and high-resolution satellite image
Number of mid- and high-rise buildings and their heights
are manually detected from satellite image.
The estimated number of buildings are validated by comparing
with the visual interpretation.

The proposed procedure is only for residential buildings.
We will collect building footprint data (cadastral data)from Municiparities of Lima to complete inventory data

Thank you for your attention!