Data Gathering and QoS Evaluation

Computational experiments of data retrieval are conducted after the data retrieval process has been set-up as described in Sect. 11.5. The cumulative data retrieval time depends on N. In order to evaluate data retrieval time, data are sequentially requested for 1000 potential facility locations. The cumulative data retrieval time 

In order to gain insights in QoS characteristics of each service, more detailed studies on QoS evaluation have been conducted. QoS is measured by the response time (i.e., the average time in which service responded to requests made by DA) and the percentage of failed request. The request is qualified as a failed request if no 

Measure Geocoding service Competitor service Real estate service Population service 

The response time for the Competitor data service and the Population data service substantially depends on the coverage radius r. For instance. The Competitor data service has the average response time of 0.76 s for r = 5 and 1.9, for r= 15. 

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