 In this paper we study the problem of estimating the relative value of  spatio-temporal data sold in wholesale and retail data marketplaces for the purpose of forecasting future demand in a certain area, e. g. a city.
<clarity>  In this paper we study the problem of estimating the relative value of  spatio-temporal data sold in wholesale and retail data marketplaces for the purpose of forecasting future demand in a certain area, e. g. a city.
 In this paper we study the problem of estimating the relative value of spatio-temporal data sold in wholesale and retail data marketplaces for the purpose of predicting demand in metropolitan areas.