Systematic sampling happens when a random sample is selected from a larger population at a regular interval. Systematic sampling is a probability sampling method where samples from a larger ...

If you specify the option METHOD=PPS_SYS, PROC SURVEYSELECT selects units by systematic random sampling with probability proportional to size. Systematic sampling selects units at a fixed interval ...

For systematic random sampling (METHOD=SYS), PROC SURVEYSELECT uses the inverse of the stratum sampling rate as the interval for the stratum. See the section "Systematic Random Sampling" for details ...

Stratified random sampling is the process of creating subgroups in a dataset according to various factors such as age, gender, income level, or education. Stratified random sampling involves the ...

With systematic sampling you can then select the points to monitor but this can introduce bias. Random sampling eliminates bias by generating the points randomly. Now you need sampling tools.