WSPC05429

• File Number: 8283.200
• Description: Colorado River Basin-Colorado River Computer Models-Colorado River Decision Support System-Ray
• State: CO
• Water Division: 5
• Date: 1/1/1996
• Author: CADSWES
• Title: South Platte Water Rights Management System-Programmers Manual
• Water Supply Pro - Doc Type: Report/Study

Data averaging

Plot data structure

to_da te. All values between these times are used in the data display.

2. If the user selected hourly or daily as the averaging interval, all values in the
interval within which start_date and end_date fall are included in the
data display. That is, from_date is created by moving start_date back to the
beginning of the hour for hourly averaged data or back to the beginning of the
day for daily averaged data. Likewise, to_date is created by using the end of the
hour or day in which end_date falls. For example, a user selects an hourly aver-
age for a gauged data display. The Preferences dialog has a time interval set in
the past from 7/111994 12:30 to 717/1994 14:00. The dates created for the call to
QueryStreamflowlni t () would be from 7/111994 12:00 to 717/1994
14:59. The averagi~g routine would use all values in any interval included in the
start_date and end_date from the Preferences dialog.

3. If the same dates from the Preferences dialog were used to create a gauged data
display with a daily averaging interval, the from_date and to_date would
be 7/1/1994 00:00 and 717/1994 23:59 respectively. Thus, the OMI functions
would retrieve all values on any day partially included in the specified time inter-
val.

If an averaging interval (other than Real. Time) is selected for a gauged data display,
the real-time data is aggregated into a single value for each timestep in the selected
time interval. The averaging algorithm is described in the "Gauge Data Aggregation"
section on page 48.

The data structure that holds the data-after it has been processed by any averaging
routines-is the PLOT_OATA_PACKAGE. This data structure holds a number of
vectors. or segments, for any selected gauge. It has the following structure:

typedef struct {
double xmin;
double xmax;
double ymin;
double ymax;

int

nvectors;

char valuetype_str[S];
CELL_PTR* segment_list;
PLOT_DATA_PACKAGE;

Where:

. xmin: The minimum x value (time) in data set.

. xmax: The maximum x value (time) in data set.

. yrnin: The minimum y value (measured value) in data set.

. yrnax: The maximum y value (measured value) in data set.

. nvectors: The number of vectors, or segments, in data.

. valuetype_str: An indicator of the type of data represented (one of FLOW,
ELEV, or STOR).

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