Street Centerlines

***This data is updated approximately 8 to 12 times per year*** This layer contains comprehensive street centerlines for Boulder County. Data was developed and is maintained by the Boulder Regional Emergency Telephone Authority (BRETSA).本数据集每年约更新8至12次。本图层包含博尔德县（Boulder County）的全要素街道中心线，由博尔德地区紧急电话管理局（Boulder Regional Emergency Telephone Authority，BRETSA）开发并维护。