how to get cities data from raw_checkins.txt

[qitianliang]

Great job! Lots of amazing and concrete works on your personal page.
however, I download your raw data from your HOME page and I found there is no city and poi mapping in your check-ins and poi data. If there is a preprocessing script to get dataset_connected_{city}.mat?
Thanks in advance.

[dingqi]

The city dataset is collected in the following steps:

1. Estimate each user's home location using the method in this paper "Participatory Cultural Mapping Based on Collective Behavior Data in Location-Based Social Networks" These users are referred as "local users".
2. For each city's local users, the users' check-ins located within 25km from the city center are filtered as the city dataset.
3. From the city dataset, if a venue has been checked less than 10 times, we removed the venue and the associated check-ins.