+

PGIS techniques to identify land use conflicts in Portsmouth

Hélène Draux, Cities Institute, London Metropolitan Universityh.draux@londonmet.ac.uk

Participatory GIS

= maps to improve participation from ‘silent

majority’

to identify land use conflicts in Portsmouth

+Structure

Case study: Coastal conflicts in Portsmouth

Methods usedFace-to-face surveySummer FairOnline survey

Recommendations

+Case study

+Farlington Marshes

Langstone Harbour

British, European and International designations (SSSI, SPA, SAC, and Ramsar)

Reclaimed three centuries ago

+Farlington Marshes

+Aims

Assess value of vulnerable open spaces

Assess flood knowledge

Understand perception of space regarding flood risks

+Face-to-face methodologies

+Face-to-face survey:Open space users and/or Farlington Marshes users, stakeholders

45 questions

15 minutes

2 types of mapping activities

162 interviews

In-depth qualitative data from each participants

Includes “silent majority”

Time consuming

Surveys only small sample, and quite short survey

Relies on the weather

:(:)

+Summer fair survey:Open space users and/or Farlington Marshes users, stakeholders

Organised by Portsmouth Climate Action Network

1 sunny day

Around 60 participants for each of the 4 activities

+ :(:)

Can reach more diverse population:FamiliesYoung peopleLess frequent park

users ..

Needs lots of people to man the activities

Relies on the fair organisers .. and weather!

Limited data from each participant

+Online survey

+Online surveyGeneral public, open space users and/or Farlington Marshes users and stakeholders

Aims to:

Attract all population in Portsmouth

Potentially get a bigger sample

+www.openspaces-portsmouth.org.uk

+Google Map API v3

Add markers with a click

Capture geolocalised information

Display kml layers..

Fieldwork

+Add markers - WebsiteLocations and flooding

Marker

Tutorial

Instructions

Postcode

+Add markers - Coding

Map:

var map = new google.maps.Map(document.getElementById("map_canvas"), options);

Add marker:

google.maps.event.addListenerOnce(map, "click", function(event)

var latlng = marker.getPosition();

Lat = latlng.lat() / Lon = latlng.lng()

For 1 location only

+Add markers - Database

+Add markers - Database

+Infowindow - Website

+Infowindow - Website

+Infowindow - Website

+Infowindow - Coding

parksLayer = new google.maps.KmlLayer(‘Parks.kml',{ suppressInfoWindows: true, preserveViewport: true }); parksLayer.setMap(map);

infowindow = new google.maps.InfoWindow({}); // Add a listener for the click event google.maps.event.addListener(parksLayer, 'click', showArrays); html describing

the infowindow

+Customised maps: kml and styles

+Customised maps: kml and styles

var myStyle = [ {featureType: "road", elementType: "labels", stylers: [{ visibility: "off" }] },{ featureType: "road.highway", elementType: "geometry", stylers: [ { saturation: -50 }, { lightness: 20 }, { visibility:

"simplified" }] },{ featureType: "road.arterial", elementType: "geometry", stylers: [{ visibility: "off" }] },{ featureType: "road.local", elementType: "geometry", stylers: [ { visibility: "off" } ]

Coding Style

+Quick analysis

+Participation

Background Parks Flood Land Use Willingness to pay Farlington Marshes0

10

20

30

40

50

60

70

80

90

100

18

100

Participants who accessed the page and usable replies

+Participation - map

+Time spent

1 2 3 4 5 6 7 8 9 10 11 12 13 14 1500:00

00:05

00:10

00:15

00:20

00:25

00:30

00:35

00:40

Average=18 minutes

+Flood perception

+Preferred scenario

Hold the line 88%

Managed realignment, loss of 80% 6%

Managed realignment, loss of 50% 6%

For 18 participants

+Issues

+Issues specific to this method

Technical

Extensive time to clear the database

Not enough completed surveys

Loss of some data

Design

Too long survey

Loss of interest

Too many questions:

No clear focus

+Recommendations

+Recommendations/suggestions

Shorter survey (5 minutes)

Focus survey on one issue

Finding gatekeepers while starting the coding

Organise hands-on sessions? (University / community centre)

+ Hélène Draux, Cities Institute

h.draux@londonmet.ac.uk http://www.openspaces-portsmouth.org.uk

Thanks!