MinakoNABESHIMA,M.NISHIOKA,M.NAKAO,

M.MIZUNO,H.TOKURA,S.MIZUTANI

OsakaCityUniv.

Populationdensity

12,000/km2 OsakacityisoneofthemosthotandhumidcityinJapan 34.5degreeNorth

Osakacityhasalargepopulationandafewparks 2.6millionpeople Area222[km2] Parkarea3.5[m2/resident]

JapanKoreaCanadaGermanFranceEnglandU.S.A.U.S.A.AverageSeoulVancouverBerlinParisLondonN.Y.L.A.

[m2/resident] OsakaCity3.5[m2/resident]

Tosurveycurrentsituation WhereisvegetationinOsakaCity HowmuchvegetationinOsakaCity

Toconsiderurbanvegetationeffectson　spatialvariabilityoftemperature

1. StudyareaandEquipment

2. Theindexesofvegetationcoverage

3. DiscussionA) Distributionofvegetationcoverage

usingtheindexesB) Vegetationeffectsontemperature

variability

Study areaStudy areaCentral urban area

Industrial coastal area

Commercial coastal area

Residential area

Osaka Bay

Osaka Plain

Osaka City

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theobservingcarequippedwithamobilemeasurementsystem

ObservationalDays1) 2ndAug.2008

• 14:30,19:30,+4:002) 5thAug.2008

• 14:30,+4:00

1. Coverageratio

2. Cindex

Theyarecalculatedfrom2kindsofGISdataset.

Theclassificationmap Photographyimagedataoflandcoverwascreatedfrom1‐meterresolutionaerialphotographs.

Pixelsareclassifiedinto5types:“grassfield”“treesorforest”“productivegreenarea”“bareground”“watersurface”.

(excludingbuildingsandroadsurfaces)

Thebuildingmap

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River Road Buildings

Thevegetationcoverageratioiscountedineach500‐metersquare

VCR[%]

imagebinarization

Almostlessthan10%

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The“Cindex”wassuggestedasanindexofconnectivity (Kobayashietal.2001)

Dataset:10‐meterresolutionimageofVCR

Inreality,theycanbefractions,0<=VCR<=1)

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TotalofCNValue＝154

Cindex＝154/29＝5.3

Theaverageof

CNvalues

CValue

Cindexinthisroad;

0~3

Cindexinthispark;

6~8

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気温

C値Cindex

Temperature

<UrbanCentralArea>

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The C index of vegetation coverage ratio

on the major road on the river on the street other than the major road

On5thAug.,PM2:30

ItisfoundthattheCindexofthecellsaroundtheurbanparksisassignedahighscore.

ThereisanegativecorrelationbetweenthetemperatureonthestreetsotherthanthemajorroadsandtheCindex.

Continuityofurbanvegetationcoveragewasconfirmedtokeeptemperaturesatarelativelylowlevel.

Details and FindingsDetails and Findings

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Roadcoverratioisover20%

Buildingcoverratiois22~62%

Privateopenspaceis15~36%

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8.4%onprivateopenspace

7.5%ontheroad

Theredevelopmentzonehassucceededfromastandpointofincreasingthevegetationcoverageratio.

Thevegetationcoverageratioofthemodernbusinesszonesisfoundtobelessthan3%becauseofthehighdensityofbuildings,ontheorderof54%‐62%.

Mostroadshaveverylowvegetationcoverageintypicalbusinesszones,wherethereisroomforincreasingthenumberofroadsidetrees.

Itisimportantthatthesunnysideofstreetshouldbecoveredwithroadsidetreeswhichconnecttotheurbanparkassoonaspossible.