[Geocoding one million of addresses using API: a semiautomatic multistep procedure].

OBJECTIVES:to geocode all residence addresses from Lazio Health Information System in order to obtain a geographical regional database. DESIGN:a semiautomatic and multistep geocoding procedure using several tools and software. SETTING AND PARTICIPANTS:all residence addresses of resident population of Lazio Region (Central Italy) in 2020. MAIN OUTCOME MEASURES:geographic coordinates at residence addresses and accuracy level of geocoding procedure for more than 1 million of addresses. RESULTS:the 99% of residence addresses in the Lazio Region have been geocoded thanks to the purposed procedure; almost 94% of the addresses have been geocoded with a good level of accuracy (more than 56% at civic number level). In the province of Rome, the percentage of addresses geocoded with a good level of accuracy is higher (97.1%), while in the province of Rieti and Frosinone is lower (82.7% and 84.2%, respectively). CONCLUSIONS:this method is useful to obtain accurate geographic coordinates of residences of the entire regional population. This database will be useful for several epidemiological studies in the Region.