INTERNATIONAL INSTITUTE FOR GEO-INFORMATION SCIENCE AND EARTH OBSERVATION

Participatory use of GIS

Spatial data acquisition

Jeroen Verplanke

Introduction

Sketch mapping: usefulness of PGIS

Particpatory spatial data acquisition described with a boundary/land use mapping example

Satellite imagery cannot be the only data sourceSatellite imagery cannot be the only data source

Good for distinguishing large scale dynamics

Social-cultural factors cannot be distinguished

Depending on local knowledge and on-site observations

Good for distinguishing large scale dynamics

Social-cultural factors cannot be distinguished

Depending on local knowledge and on-site observations

Making sketch mapsMaking sketch maps

Result

Perceptions of

distance

and

importance

Reality vs. perceptionReality vs. perception

A1 B1 A2 B2

Visualization strategies

Maps as final products a means of visual communication

Maps as intermediate products an aid to visual thinking

Visualization strategies

What is the purpose of the map ?

Who will read the map ?

Where will the map be used ?

What data are available to compose the map ?

….. ?

Transects

Data collection Sampling

Local guides

PDA

Recording

Boundary mapping

GPS coordinates

Need local knowledge

Resources and boundaries

Boundary data inserted as layer

Other activities and observations

Recording anomalies Observe to understand Triangulation

Impact assessment

Evaluating observationsEvaluating observations