spatio-temporal data

Dear All,
I want to construct a ST class data with spacetime package.
Observations are cancer mortality rate in 15 fixed locations for
sparse time in 7 years.
I don't know how input my data as a locations and time. I have seen example
data air and fires in this package but I can't understand how they constructed.
for example can I input my data as a below then construct a st class?how?

locations      x      y    time
   point1    cord1   cord2  time1
   point1    cord1   cord2  time2
      .        .       .      .
      .        .       .      .
Best.

Saman Monfared
Msc, Department of Statistics, Shiraz University,
Shiraz 71454, Iran
Email: Samanmonfared1 at gmail.com

Tel: +98 917 5305167