An important part of the MESH
process has been to focus on the integrity of existing maps and to
encourage an honest / open approach to assessing the suitability of
each map to the intended purpose. The project has developed a
‘confidence assessment methodology’ where the evaluation process
addresses three main questions:
1. How good is the remote sensing?
2. How good is the ground truthing?
3. How good is the data interpretation?
These questions were selected
because MESH promotes the creation of habitat maps through the
interpretation of remote sensing data and ground truthing data. The
maps on the MESH webGIS are presented with confidence ratings so
that end-users can determine their adequacy for decision-making. In
addition, future survey effort can be strategically directed
to areas where maps have relatively low confidence or no map
coverage. The selection of maps assessed includes
historical maps as well as recent maps. For guiding future work,
MESH developed a survey scoping tool that assists the survey
planning stage to help assure a project can deliver a final map
with the desired confidence rating.
The ICES (International Council for the Exploration of the
Seas) Working Group for Marine Habitat Mapping reviewed the MESH
confidence assessment tools and commented, “This is considered to
be the first multi-criteria, systematic, confidence assessment
methodology of its kind to be produced for marine habitat
The MESH Confidence
Assessment Tool is available either as a template MS Excel
spreadsheet, most appropriate for the assessment of multiple maps,
or as a Flash tool, more appropriate for the assessment of a single
map, and potentially a useful tool in the planning process. These
can be accessed by clicking on the links below.
MESH Confidence Assessment Tools
|Confidence Assessment Tools
|MESH Confidence Assessment
Use the Scoresheet tab to enter your confidence assessments
for maps. Scoring guidelines are held in separate tabs, or you can
refer to the guidance document below if you prefer. Do not change
the weightings if you are making assessments which you will
contribute to MESH.
Confidence Assessment Guidance
Guidelines for assessing the confidence of a map bases on a
number of factors. These guidelines are the same as those included
in the tabs of the MESH Confidence Assessment Scoresheet.