How little is enough? Evaluation of user satisfaction withmaps generated by a progressive transmission scheme forgeospatial data

Progressively transmission of vector data represents a promising means of delivering large amounts of geospatial data to mobile device users who are constrained by: small screen size, limited bandwidth, and limited device storage. A progressive transmission strategy works for a given spatial dataset by computing a series of level of maps at increasing detail. The theoretical approach of progressive transmission is to send every progressive level of the map. However, some users depending on their requirements may be satisfied with one of the intermediate level detail maps. This will result in a resource saving to the user in terms of both download waiting time and bandwidth. This paper discusses user trails to quantify user satisfaction with the output of this progressive transmission scheme, which is based on overall shape complexity of the geographical features in the map. Initial results indicate a significant relationship between Levels of Detail (LOD) and usability of the corresponding progressively transmitted maps.

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