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Ortophoto-mapping
Photomaps are printouts of geometrically
corrected (rectified) aerial photographs placed in a map
coordinate system. The corrected aerial photos are called
orthophotos. Plotted Orthophoto-maps are the most accurate
and economical remote sensing data for mapping purposes with
large scale maps. They are easy to use and a non-literate
tool to effectively engage farmers in discussions on natural
resource use, planning and management.
Conventional
approaches to obtain land use maps are usually conducted by
outsiders who interpret remote sensing data without profound
knowledge of local resource conditions. Limited field
experience possibly results in inaccurate delineation and
misinterpretation of land use classes. The objective of
participatory photo-mapping is to enable villagers to carry
out the interpretation of aspects of their land resources,
which are of significant importance to them. In this process
villagers delineate their land use on transparencies laid
over an orthophoto. The information on the
transparencies will later be scanned or digitized and
geo-referenced. Involving local stakeholders with their
extensive field experience is expected to improve the
accuracy and precision of obtained data.
(Source: Daniel Muller and Bjorn Wode. 2003)
