GIS FOR APPLIED ECONOMICSGIS FOR APPLIED ECONOMICS Visualization tools and Vector Transformation...
Transcript of GIS FOR APPLIED ECONOMICSGIS FOR APPLIED ECONOMICS Visualization tools and Vector Transformation...
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GISFORAPPLIEDECONOMICS
VisualizationtoolsandVectorTransformation(II)
JuanCarlosMuñoz-MoraUniveristatPompeuFabra
Nov2016
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ROADMAP1. Commentsonthereplicationfromprevioussession2. AdditionalconceptsinVectorTransformation3. ConceptsinVectorTransformation(II)
BufferDistances
4. Bufferanddistancesinaction5. ReplicationDell()
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REPLICATIONPREVIOUSSESSION
Desktopsolution?ReplicationpyQGISReplicationStandalone
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DESKTOPSOLUTIONS(ANIDEA)1addnewvariableattribute2makeintersection3exportdatatoR(csv)4identifyrepeatedunion5joindatafrom
outside
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ADDITIONALCONCEPTSINVECTORTRANSFORMATION
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UNION
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Inshapely(Standalonesolution)
InpyQGIS
a.union(b)
processing.runalg('qgis:union', input, input2, output)
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DIFFERENCE
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Inshapely(Standalonesolution)
InpyQGIS
a.difference(b)
processing.runalg('qgis:difference', input, overlay, output)
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SYMMETRICDIFFERENCE
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Inshapely(Standalonesolution)
InpyQGIS
a.symmetric_difference(b)
processing.runalg('qgis:symetricaldifference', input, overlay, output)
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SPATIALJOINOverlappingNearbyjoin
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DESKTOPSOLUTIONS(PLUGINS)mmqgisspatialjoin
ANYIDEA(INTUITION)HOWCANWEIMPLEMENTTHISINPYTHON/PYQGIS?
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Inshapely(Standalonesolution)
InpyQGIS
## ---- For Polygons## Option 1 - object.contains(other)## Option 2 - at the borderobject.touches(other)## Option 3object.within(other)## --- For Linesobject.crosses(other)object.disjoint(other)
processing.runalg('qgis:joinattributesbylocation' , target, join, predicate, summary, stats, keep, output)
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CONCEPTSINVECTORTRANSFORMATION(II)
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BUFFERThisoperationcreatesapolygonaround
theobjectataspecifieddistance.
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Neighborhood(averyrusticdefinition-why?)Identifyspilloversoftreatments
,Peereffect
Alternativewaystodefinetreatment
DISTANCES
Miguel&Kremer(2004) deMeletal.(2008)
Conley&Udry(2010)
Muehlenbachsetal.(2015)
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Proximity(veryrude)Buildinstruments(Validity!)
Moreonlocationasainstrumentsee
Whatisthedifferentwithbuffferapproach?
Oster(2012)Nunn(2008)
Gibson&McKenzie2007
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U.S.commercialairports,2008greatarcsandsymbolmapshowVoronoi
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Reportamaperror
PompeuFabraUniversity
Madrid,SpainMoreoptions
Signin
©2016Google-Mapdata©2016GeoBasis-DE/BKG(©2009),Google,Inst.Geogr.Nacional TermsofUse
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ThreemodelsoftheEarthtocalculatedistances:
FlatplaneSphericalEllipsoid
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FLATPLANE-EARTHASAFLATPLANEEuclideandistance(Pythagoreantheorem )
whatifweuseunprojectedcoordinates?units
+ =a2 b2 c2
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SPHERICAL-EARTHASAPERFECTSPHEREGreatcircledistance(Haversineformula-decimalsdegrees)
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ELLIPSOID-EARTHASANON-PERFECTSPHERE
Greatcircledistance(Vincentyformula-decimalsdegrees)
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But,whataboutifwewouldliketotakeintoaccountroads?
Wewilldiscussitonthelastsession!
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CONCEPTSINVECTORTRANSFORMATION(II)
INACTION
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DavidYanagizawa-Drott
QuarterlyJournalofEconomics,2014,129(4),pp.1947-199
PROPAGANDAANDCONFLICT:EVIDENCEFROMTHERWANDAN
GENOCIDE
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Theroleofmassmediaintimesofconflictandstate-sponsoredmassviolenceagainstcivilians.
METHODRTLMtransmittersandradiopropagationsoftwareradiocoveragewithineachvillage.Casuallink receptiongeneratedbyRwanda'shighlyvaryingtopography
MAINFINDINGBroadcastsledtomoreviolenceduringthegenocide.
participation(10%oftotal-51,000persons)spillovereffectsinmilitiaviolence
→
→
↑↑
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Inadditiontoviolencebythemilitary,attacksandmassacresconductedbylocalmilitiasgroupsandordinary
civilianscontributedtoadeathtollof0.5–1.0milliondeaths(DesForges,1999;Straus,2004;Verwimp,2006).
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TimothyG.ConleyandChristopherR.Udry
AmericanEconomicReview2010,100:1,35–69
LEARNINGABOUTANEWTECHNOLOGY:PINEAPPLEINGHANA
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TheroleofsociallearninginthediffusionofanewagriculturaltechnologyinGhana. Dofarmerslearnfrom
theirpeers?
MAINFINDINGSFarmersadjusttheirinputstoalignwiththoseoftheir
informationneighborswhoweresurprisinglysuccessfulinpreviousperiods.
DATAGeo-locatedpanelhouseholdsurveys(every6weekin1996-
98)in3villagesofsouthernGhana
→
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NEIGHBORHOODMETRICResponseto"Haveyouevergoneto__foradviceabout
yourfarm?"
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EMPIRICALSPECIFICATION
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INDEXOFGOODNEWSINPUTLEVELS
Standarderrors:calculatedbyConley(1999)
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SPATIALREGRESSIONDISCONTINUITY
DESIGN(fewwords)
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WHATISDIFFERENT?Usingboundariesascutoff
lines(set)Indicator-Score-coordinatestwo-dimensions
Further
→
Keele&Titiunik2014
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SomeapplicationsinEconomics
DELL(2010) MICHALOPOULOS&PAPAIOANNOU(2014)
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NathanNunn
TheQuarterlyJournalofEconomics(2008)123(1):139-176.
(GISstrategyreplication)
THELONG-TERMEFFECTSOFAFRICA'SSLAVETRADES
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THEPAPERCanpartofAfrica'scurrentunderdevelopmentbeexplained
byitsslavetrades?
DATASlavesexportedfromeachcountry
fromeachportofAfricaEthnicityofasampleof100,00+slavesEthnichomelandinAfrica
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REDUCEDFORM
GDPpercapitaincountry in2000
#ofslavesexported1400-1900fromcountry
Landsurfaceareaofcountry
Controls
= α + β ln( ) + +yiexporti
areaiX ′
i εi
yi i
exportsi
i
areai i
X ′i
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DISTANCEASINSTRUMENT
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EXCLUSIONRESTRICTION-LOCATIONOFSLAVEPORTS
climatesuitabilityofplantationcrops/locationofminesnotaffectedbythedistancetoAfricaDistancetoslavemarkets Distancetoothereconomicopportunities
≠
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FIRSTSTAGE
where,
Distancetonearestslavetradecenters
ln( ) = δ + Ω + +exportsi
areaiD′
i X ′i μi
=D′i
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RESULTS(FIRSTSTAGE)
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RESULTS(SECONDSTAGE)
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REPLICATIONPLANDistancetotheSlaveTradeCenterFromeachcountrytilltheAtlanticborder
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REPLICATEITSINSTRUMENTDistancetonearestslavetradecentersPLANARE
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TIPSFORPYQGISInpyQGIS
processing.runalg('qgis:union', input, input2, output)
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TIPSFORPYQGISGettingthecentroids
Featurebyfeature
processing.runalg('qgis:polygoncentroids', input_layer, output_layer)
for f in layer.getFeatures(): pt = f.geometry().centroid().asPoint()
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DistanceMatrixprocessing.runalg('qgis:distancematrix', input_layer, input_field, target_layer, target_field, matrix_type, nearest_points, distance_matrix)
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FORNEXTSESSIONInstallthefollowinglibraries
rasteriorasterstats