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A pyramid structure was used in the CVLA (see figure 5).
Technical decisions, such as those discussed above for delivery media, are important; choices regarding aesthetics also heavily influence viewing experience (Robinson, 1989)--atlas design, from backgrounds to headings to support images, were considered at length in the CVLA development.
For example, the hard copy version of the CVLA demonstrates how a subset of layers can be collated--in this case the regional map, elevation map, and satellite image--and compiled into a tailored product--in this case an overview (of 16 pages) of the longer CVLA (currently 64 pages).
Individual CVLA information layers were developed as a result of both internal and external inspiration.
The capacity of the CVLA to be further influenced by viewers' feedback and contributions is a particular, positive example of such an issue.
In this spirit, the CVLA attempts to circumvent technology-dependence by offering a range of transfer formats (e.g.
This review of technological depth was taken into account in the CVLA development, in particular, with the dual use of JPEG and PDF maps in the online version.
As was also implied earlier, the development of the CVLA treated interpretation and synthesis as more important than dynamic overlay.
Similar to the CVLA, the VRO uses a 3-layer pyramid structure with an object-oriented base level, and a middle level split into an expandable set of theme areas (Climate, Landform, Landuse, Soil, Water, Biodiversity, Vegetation, Land & Water Management, Investing in Land & Water).
Even though the CVLA has a focus on biodiversity and topography information, the concepts raised by its development are relevant to other applications, with different focuses and in different places and data realms.
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- Cvirka, Petras