The intelligence of Smart Cities (SC) is represented by its ability in collecting, managing, integrating, analyzing and mining multi-source data for valuable insights. In order to harness multi-source data for an informed place design, this paper presents "Public Sentiments and Activities in Places" multi-source data analysis flow (PSAP) in an Informed Design Platform (IDP). In terms of key contributions, PSAP implements 1) an Interconnected Data Model (IDM) to manage multi-source data independently and integrally, 2) an efficient and effective data mining mechanism based on multi-dimension and multi-measure queries (MMQs), and 3) concurrent data processing cascades with Sentiments in Places Analysis Mechanism (SPAM) and Activities in Places Analysis Mechanism (APAM), to fuse social network data with other data on public sentiment and activity comprehensively. As proved by a holistic evaluation, both SPAM and APAM outperform compared methods. Specifically, SPAM improves its classification accuracy gradually and significantly from 72.37% to about 85% within 9 crowd-calibration cycles, and APAM with an ensemble classifier achieves the highest precision of 92.13%, which is approximately 13% higher than the second best method. Finally, by applying MMQs on "Sentiment&Activity Linked Data", various place design insights of our testbed are mined to improve its livability.
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