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 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 maps

A process of many hours…

Result Perceptions of distance and importance

Reality 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 observations