Turf.jsで簡単 Geoデータ処理

5VSGKTͰ؆୯ (FPσʔλॲཧ 5BSP.BUTV[BXB !TNFMMNBO (FPSFQVCMJD

5BSP.BUTV[BXB !TNFMMNBO ཧࣄ΍ͬͯ·͢ ཧࣄ΍ͬͯ·͢ ˓˓˓૊Ͱ૊௕΍ͬͯ·ͨ͠

4UBUFPGUIF.BQ+BQBO ౔ ೔ൺ୩ίϯϕϯγϣϯϗʔϧͰ։࠵ εϙϯαʔ௒ืूதʂʂʂ ͳ͔ͥࠓͷॴฐ͚ࣾͩεϙϯαʔPS[ ͜ͷ··Ͱ͸͍Ζ͍Ζ੺ࣈ͕PS[ એ఻ IUUQTTUBUFPGUIFNBQKQ

͕࣌ؒ༨ͬͨΒ͜Μͳॲཧ Ͱ͖ͳ͍ʁ ࣭ͬͯ໰ΛTMJEPͰ ड͚෇͚·͢

IUUQUVSGKTPSH

IUUQTHJUIVCDPN5VSGKTUVSG

Կ͕Ͱ͖Δʁ w ϒϥ΢β΋͘͠͸/PEFKTͰ(FPσʔλͷॲཧ w ม׵)FMQFS w ܭࢉ w ੜ੒ w
ͦͷଞ

ม׵)FMQFS w ഑ྻ͔Β(FP+40/΁ม׵ w UVSGQPMZHPO <<ʜ ʜ> <ʜ ʜ> ʜ>
w 'FBUVSF$PMMFDUJPOͷ࡞੒

ܭࢉ w த৺఺ w UVSGDFOUSPJE QPMZHPO w 'FBUVSF্ͷϙΠϯτΛऔಘ w
UVSGQPJOU0G'FBUVSF QPMZMJOF w ઢ͕ަΘΔϙΠϯτΛऔಘ w UVSGMJOF*OUFSTFDU MJOF MJOF

ੜ੒ w ϘϩϊΠਤͷੜ੒ w UVSGWPSPOPJ QPJOUT PQUJPOT w 5*/
5SJBOHMF*SSFHVMBS/FUXPSL ͷ࡞੒ w UVSGUJO QPJOUT b[` QSPQFSUJFT[ʹඪߴ͕͋Δ w IFY(SJEͷ࡞੒ w UVSGIFY(SJE CCPY DFMM4JEF PQUJPOT

ͦͷଞ w ϥϯμϜͷϙΠϯτΛ࡞੒ w UVSGSBOEPN1PJOU \CCPYCCPY^ w ςετσʔλΛ࡞Δͷʹศར

ϘϩϊΠਤ WBSPQUJPOT\ CCPY< > ^ WBSQPJOUTUVSGSBOEPN1PJOU PQUJPOT
WBSWPSPOPJ1PMZHPOTUVSGWPSPOPJ QPJOUT PQUJPOT -HFP+TPO QPJOUT BEE5P NBQ -HFP+TPO WPSPOPJ1PMZHPOT BEE5P NBQ

5*/ WBSCCPY< > WBSQPJOUTUVSGSBOEPN1PJOU \CCPYCCPY^ GPS
WBSJJQPJOUTGFBUVSFTMFOHUIJ \ QPJOUTGFBUVSFT<J>QSPQFSUJFT[dd .BUISBOEPN ^ WBSUJOUVSGUJO QPJOUT [ WBSSFU$PMPS WBM \ SFUVSO QBSTF*OU WBM UP4USJOH TVCTUS ^ -HFP+TPO UJO \ TUZMFGVODUJPO HFP+TPO'FBUVSF \ WBSSSFU$PMPS HFP+TPO'FBUVSFQSPQFSUJFTB WBSHSFU$PMPS HFP+TPO'FBUVSFQSPQFSUJFTC WBSCSFU$PMPS HFP+TPO'FBUVSFQSPQFSUJFTD SFUVSO\ pMMUSVF pMM$PMPSA\S^\H^\C^A pMM0QBDJUZ ^ ^ ^ BEE5P NBQ

CPPMFBO1PJOU*O1PMZHPO WBSQPJOUTUVSGSBOEPN1PJOU WBSQPMZHPOTUVSGSBOEPN1PMZHPO -HFP+TPO QPMZHPOT \
TUZMF HFP+TPO'FBUVSF \ DPOTUpMMQPJOUTGFBUVSFTTPNF QPJOU \ SFUVSOUVSGCPPMFBO1PJOU*O1PMZHPO QPJOU HFP+TPO'FBUVSF ^ SFUVSO\ pMMpMM ^ ^ ^ BEE5P NBQ -HFP+TPO QPJOUT BEE5P NBQ

VOJPO WBSCCPY< > WBSCCPY1PMZHPOUVSGCCPY1PMZHPO CCPY WBSCCPY<
> WBSCCPY1PMZHPOUVSGCCPY1PMZHPO CCPY WBSVOJPOUVSGVOJPO CCPY1PMZHPO CCPY1PMZHPO -HFP+TPO VOJPO \ TUZMF G \ SFUVSO\pMMUSVF^ ^ ^ BEE5P NBQ

EJ⒎FSFODF WBSCCPY< > WBSCCPY1PMZHPOUVSGCCPY1PMZHPO CCPY WBSCCPY<
> WBSCCPY1PMZHPOUVSGCCPY1PMZHPO CCPY WBSEJ⒎FSFODFUVSGEJ⒎FSFODF CCPY1PMZHPO CCPY1PMZHPO -HFP+TPO CCPY1PMZHPO \TUZMF @ \SFUVSO\pMMGBMTF^^^ BEE5P NBQ -HFP+TPO CCPY1PMZHPO \TUZMF @ \SFUVSO\pMMGBMTF^^^ BEE5P NBQ -HFP+TPO EJ⒎FSFODF \ TUZMF G \ SFUVSO\pMMUSVF^ ^ ^ BEE5P NBQ

DFOUSPJE WBSUVSGSFRVJSF !UVSGUVSG WBSGTSFRVJSF GT WBSGFBUVSFTGTSFBE'JMF4ZOD IBOBNJHBXBHFPKTPO
GFBUVSFT+40/QBSTF GFBUVSFT BSS<> GFBUVSFTGFBUVSFTNBQ G \ DFOUFSUVSGDFOUSPJE G \LFZGQSPQFSUJFT<,&:@$0%&>^ BSSQVTI DFOUFS ^ WBSDPMMFDUJPOUVSGGFBUVSF$PMMFDUJPO BSS GTXSJUF'JMF4ZOD IBOBNJHBXB@QPJOUTHFPKTPO +40/TUSJOHJGZ DPMMFDUJPO

ศརͳͱ͜Ζ w ΫϥΠΞϯταΠυͰࣗࡏʹσʔλॲཧ͕Մೳ w 1PTU(*4αʔόʹґଘ͠ͳ͍΍Γํ͕ՄೳʹͳΔ w /PEFKTͰ؆୯ͳπʔϧΛ࡞Δ͜ͱ͕Ͱ͖Δ

Ԡ༻ w 3FBDU/BUJWF্ͰεϚʔτϑΥϯΞϓϦ։ൃ w +BWB4DSJQUϕʔεͰಈͨ͘ΊUVSGKT͕ಈ͘ w ࣮ྫ w (14-PHHFS ڑ཭Λදࣔ
w CCPYΛܭࢉ SFBDUOBUJWFNBQTʹ͸ը໘ͷCCPY͕ͦ ΋ͦ΋ແ͍

(14-PHHFS JNQPSU\MJOF4USJOH^GSPN!UVSGIFMQFST JNQPSUMFOHUIGSPN!UVSGMFOHUI ʜ @TUBSU8BUDI1PTJUJPOBTZOD \ DPOTUTVCTDSJQUJPOBXBJU-PDBUJPOXBUDI1PTJUJPO"TZOD \ FOBCMF)JHI"DDVSBDZUSVF EJTUBODF*OUFSWBM
^ UIJT@MPHHJOH1PTJUJPO UIJTTFU4UBUF \TVCTDSJQUJPOTVCTDSJQUJPO^ ^ @MPHHJOH1PTJUJPO \DPPSET UJNFTUBNQ^ \ JG DPPSETBDDVSBDZ \ MFUMPHHJOH%BUBUIJTTUBUFMPHHJOH%BUB MPHHJOH%BUBQVTI \UJNFTUBNQUJNFTUBNQ MBUJUVEFDPPSETMBUJUVEF MPOHJUVEFDPPSETMPOHJUVEF^ DPOTUMJOFMPHHJOH%BUB5P-JOF MPHHJOH%BUB MFUSVOOJOH-FOHUI JG MJOFMFOHUI \ DPOTUHFPKTPO-JOFMJOF4USJOH MJOF SVOOJOH-FOHUIMFOHUI HFPKTPO-JOF ^ UIJTTFU4UBUF \SVOOJOH-FOHUISVOOJOH-FOHUI MPHHJOH%BUBMPHHJOH%BUB^ ^ ^

CCPYͷܭࢉ JNQPSU\QPJOU^GSPN!UVSGIFMQFST JNQPSUEFTUJOBUJPOGSPNb!UVSGEFTUJOBUJPO ʜ PO3FHJPO$IBOHF$PNQMFUF SFHJPO \ DPOTUDFOUFSQPJOU <SFHJPOMPOHJUVEF SFHJPOMBUJUVEF>
DPOTUWFSUJDBM.FUFS SFHJPOMBUJUVEF%FMUB DPOTUIPSJ[POUBM.FUFS SFHJPOMPOHJUVEF%FMUB DPOTUPQUJPOT\VOJUTLJMPNFUFST^ DPOTUTPVUIEFTUJOBUJPO DFOUFS WFSUJDBM.FUFS PQUJPOT DPOTUXFTUEFTUJOBUJPO DFOUFS IPSJ[POUBM.FUFS PQUJPOT DPOTUOPSUIEFTUJOBUJPO DFOUFS WFSUJDBM.FUFS PQUJPOT DPOTUFBTUEFTUJOBUJPO DFOUFS IPSJ[POUBM.FUFS PQUJPOT UIJTTFU4UBUF \ TPVUITPVUIHFPNFUSZDPPSEJOBUFT<> XFTUXFTUHFPNFUSZDPPSEJOBUFT<> OPSUIOPSUIHFPNFUSZDPPSEJOBUFT<> FBTUFBTUHFPNFUSZDPPSEJOBUFT<> ^ ^ ʜ .BQ7JFX PO3FHJPO$IBOHF$PNQMFUF\UIJTPO3FHJPO$IBOHF$PNQMFUF^

·ͱΊ w 5VSGKTͰ͸+BWB4DSJQU͚ͩͰ஍ཧۭؒ৘ใΛѻ͏͜ͱ͕ Մೳ w ૊Έ߹Θͤํ͕͍Ζ͍Ζ͋Δ w ϒϥ΢βͰ׆༻ w εΫϦϓτͰ׆༻
w εϚʔτϑΥϯΞϓϦ։ൃͰ׆༻

Turf.jsで簡単 Geoデータ処理

Turf.jsで簡単 Geoデータ処理

Taro Matsuzawa aka. btm

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5VSGKTͰ؆୯ (FPσʔλॲཧ 5BSP.BUTV[BXB !TNFMMNBO (FPSFQVCMJD

5BSP.BUTV[BXB !TNFMMNBO ཧࣄ΍ͬͯ·͢ ཧࣄ΍ͬͯ·͢ ˓˓˓૊Ͱ૊௕΍ͬͯ·ͨ͠

4UBUFPGUIF.BQ+BQBO ౔ ೔ൺ୩ίϯϕϯγϣϯϗʔϧͰ։࠵ εϙϯαʔ௒ืूதʂʂʂ ͳ͔ͥࠓͷॴฐ͚ࣾͩεϙϯαʔPS[ ͜ͷ··Ͱ͸͍Ζ͍Ζ੺ࣈ͕PS[ એ఻ IUUQTTUBUFPGUIFNBQKQ

͕࣌ؒ༨ͬͨΒ͜Μͳॲཧ Ͱ͖ͳ͍ʁ ࣭ͬͯ໰ΛTMJEPͰ ड͚෇͚·͢

IUUQUVSGKTPSH

IUUQTHJUIVCDPN5VSGKTUVSG

Կ͕Ͱ͖Δʁ w ϒϥ΢β΋͘͠͸/PEFKTͰ(FPσʔλͷॲཧ w ม׵)FMQFS w ܭࢉ w ੜ੒ w

ม׵)FMQFS w ഑ྻ͔Β(FP+40/΁ม׵ w UVSGQPMZHPO <<ʜ ʜ> <ʜ ʜ> ʜ>

ܭࢉ w த৺఺ w UVSGDFOUSPJE QPMZHPO w 'FBUVSF্ͷϙΠϯτΛऔಘ w

ੜ੒ w ϘϩϊΠਤͷੜ੒ w UVSGWPSPOPJ QPJOUT PQUJPOT w 5*/

ͦͷଞ w ϥϯμϜͷϙΠϯτΛ࡞੒ w UVSGSBOEPN1PJOU \CCPYCCPY^ w ςετσʔλΛ࡞Δͷʹศར

ϘϩϊΠਤ WBSPQUJPOT\ CCPY< > ^ WBSQPJOUTUVSGSBOEPN1PJOU PQUJPOT

5*/ WBSCCPY< > WBSQPJOUTUVSGSBOEPN1PJOU \CCPYCCPY^ GPS

CPPMFBO1PJOU*O1PMZHPO WBSQPJOUTUVSGSBOEPN1PJOU WBSQPMZHPOTUVSGSBOEPN1PMZHPO -HFP+TPO QPMZHPOT \

VOJPO WBSCCPY< > WBSCCPY1PMZHPOUVSGCCPY1PMZHPO CCPY WBSCCPY<

EJ⒎FSFODF WBSCCPY< > WBSCCPY1PMZHPOUVSGCCPY1PMZHPO CCPY WBSCCPY<

DFOUSPJE WBSUVSGSFRVJSF !UVSGUVSG WBSGTSFRVJSF GT WBSGFBUVSFTGTSFBE'JMF4ZOD IBOBNJHBXBHFPKTPO

ศརͳͱ͜Ζ w ΫϥΠΞϯταΠυͰࣗࡏʹσʔλॲཧ͕Մೳ w 1PTU(*4αʔόʹґଘ͠ͳ͍΍Γํ͕ՄೳʹͳΔ w /PEFKTͰ؆୯ͳπʔϧΛ࡞Δ͜ͱ͕Ͱ͖Δ

Ԡ༻ w 3FBDU/BUJWF্ͰεϚʔτϑΥϯΞϓϦ։ൃ w +BWB4DSJQUϕʔεͰಈͨ͘ΊUVSGKT͕ಈ͘ w ࣮ྫ w (14-PHHFS ڑ཭Λදࣔ

(14-PHHFS JNQPSU\MJOF4USJOH^GSPN!UVSGIFMQFST JNQPSUMFOHUIGSPN!UVSGMFOHUI ʜ @TUBSU8BUDI1PTJUJPOBTZOD \ DPOTUTVCTDSJQUJPOBXBJU-PDBUJPOXBUDI1PTJUJPO"TZOD \ FOBCMF)JHI"DDVSBDZUSVF EJTUBODF*OUFSWBM

CCPYͷܭࢉ JNQPSU\QPJOU^GSPN!UVSGIFMQFST JNQPSUEFTUJOBUJPOGSPNb!UVSGEFTUJOBUJPO ʜ PO3FHJPO$IBOHF$PNQMFUF SFHJPO \ DPOTUDFOUFSQPJOU <SFHJPOMPOHJUVEF SFHJPOMBUJUVEF>

·ͱΊ w 5VSGKTͰ͸+BWB4DSJQU͚ͩͰ஍ཧۭؒ৘ใΛѻ͏͜ͱ͕ Մೳ w ૊Έ߹Θͤํ͕͍Ζ͍Ζ͋Δ w ϒϥ΢βͰ׆༻ w εΫϦϓτͰ׆༻