Public facility space reachability evaluation method based on travel isochronous circle

The invention provides a public facility space reachability evaluation method based on a travel isochronous circle, relates to the technical field of data processing of public services, is used for reachability evaluation of public facility space, and comprises the following steps: determining a demand element point and a supply element point in a Gaussian two-step movement method, the supply element points are public facilities, and the number of households and the number of floors are crawled according to data of all large rental house websites in the current year to estimate population; respectively starting from supply and demand element points, according to actual statistical analysis data of walking, riding or riding, selecting a proper time threshold as an isochronous circle, and respectively taking the isochronous circle as a service range of public facilities and a search range of population; and evaluating the reachability of the public facility space by combining a search range, a service range and