Geolnformation Management 2
GIM711S
Question 3
Sel! PGIS practitioners use a range of low- and high-tech geographic information
(6)
technologies for acquisition, validation, analysis, representation and sharing of geo-
spatial information. Name and describe 3 of the technologies used.
¢ Ground mapsv are produced by the most basic map-making method which involves
drawing maps on the ground. Informants use raw materials like soil, pebbles, sticks
and leaves to reproduce the physicalv and cultural landscapes in the manner they
perceive them to be. Vv
e Sketch mappingv is a slightly more elaborate method which makes use of large sheets
of craft paper. Features are depicted with natural materials or more frequently with
coloured marker pens or chalk. Vv Participants usually have a range of choices
regarding the materials to use for the drawing and how to visualise desired items. V
e Scale mappingv is aimed at generating georeferenced data to facilitate discussions
and allow community members to develop maps which can stand scrutiny by
adversarial parties. VThe method is based on effectively selecting symbols and colours
to depict ISK on transparencies superimposed on a geocoded and scaled map or
remote-sensed images. V
e Mapping using mobile GPS-enabled devicesvV has spread among NGOs and
indigenous people’s organisations as GPS technology has become cheaper and more
affordable. Vv The technology is used to demarcate ancestral lands and areas where
access to and control over natural resources are in dispute. V Data recorded are
frequently used to add accuracy to information depicted on sketch maps,
¢ Geographic Information Systems (GIS), V use the functionality and data associated
with GIS technology to explore community-driven questions. . V Local spatially
referenced and non-spatial data are integrated and analysed to support discussion
and decision-making processes. v The spatial analytic functionalities allow the users
to conduct analyses more easily and rapidly. This approach can also be relatively
expensive and requires frequent software updates and subsequent retraining.
e Participatory 3D modelling (P3DM) v integrates ISK with data on elevation of the land
and depth of the sea to produce stand-alone, scaled and georeferenced 3D models. V
e ISK is used by informants to depict land-use and cover and other features on the model
using push pins (for points), yarns (for lines) and paints (for polygons). V
e The model remains with the community after completion of the exercise. Derived
maps are used to interact with remote parties.
e¢ Participatory mapping using aerial photography and remote-sensing images. V
Aerial photography and remote sensing images can be georeferenced Vand used as
scale maps. Scale, orientation, coordinate system and contour lines are shown,
making air photo maps excellent references for participatory mapping initiatives. V
¢ Participatory Internet-based mappingv involves the use of web-based applications
(e.g. Google Maps, Google Earth or Openstreetmap) to locate and present local
Second Opportunity Memorandum
Page 6 of 9
January 2020