Basic BI questions of calculating formulas from raw data on 15-min and 1-hr intervals?

I'm new to BI and I'm working on a project that (I believe) can help me gain experience with this technology. The formula I'm working on now is really the simplest one.
We have 15-minute data that has tons of counters. I'm currently storing in a table called [Counter15MinCityDataRaw], like so:
Id City Date Hour Minute KpiValue Counters InsertDate
108823 Miami 20140930 9 0 100.00 Auto 2014-09-30 12:17:07.580
108824 NYC 20140930 9 0 0.50 Added 2014-09-30 12:17:07.580
108825 Vegas 20140930 9 0 12.00 Att 2014-09-30 12:17:07.580
108826 Miami 20140930 9 0 40.00 Man 2014-09-30 12:17:07.580
108823 Miami 20140930 9 15 100.00 Auto 2014-09-30 12:17:07.580
108824 NYC 20140930 9 15 0.50 Added 2014-09-30 12:17:07.580
108825 Vegas 20140930 9 15 12.00 Att 2014-09-30 12:17:07.580
108826 Miami 20140930 9 15 40.00 Man 2014-09-30 12:17:07.580
This is the raw data. The first formula I'll be working on is [TotalPopulation], that looks like this: [TotalPopulation] = (Q + (Auto+Man))
/ 400. Q equals the Number of quarters being processed (ie. Q =
1 for 15-minute interval, Q = 4 for 1-hr interval)
So my intial requirements is to create a report that displays the [TotalPopulation] for each City in 15-min and 1-hr intervals.
So I already created both [DimDate] and [DimCity] tables, although I don't think they're going to help when I calculate the 15-minute intervals and the 1-hr intervals. Also, can I use the raw data as
is for the fact table, or would I need to group the data by city and counter (in
this case Auto and Man) into a new fact
table?
So my question is: do I need a dimension table for the 15-minute intervals and 1-hour intervals? How would my Fact table look like? Would I also need a dim table for the Q variable?

If i understand it correct you can create one more dimension as DimQuarter, which will have members 15 Min interval, 30 Min interval, 45 min interval, 1 hour interval.
The next step is to add a column on top of Raw Data for Quarter surrogate key along with existing dimensions.
Hope this will get you started.
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