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3.2. The art of combining circles

If the user selects only one circle, the presentation of the report is straightforward: one column per year, one row per kind of bird.

What should we display, then, if the user selects multiple circles? The answer depends on the intended use of the report.

In functional terms, these needs are served by presenting the resulting report in two different forms:

Here, then, are the cases for report presentation.

  1. If the user selects only one circle, each column of the report will display the data for one year number in which the circle was worked.

  2. If multiple circles are selected, the format depends on whether the user selected the split presentation.

    1. For the split presentation, each column contains the data for a single circle in a single year number. Multiple columns for the same year number are grouped together, with the circles ordered by their year key.

    2. For the lumped presentation, the format depends on whether the user selected the rigorous comparability checkbox.

      1. For a rigorous report, there will be a column for each year in which all the circles are worked. This may result in a report with zero columns.

      2. If the user has not selected rigor, each column of the report will represent all the circles worked in a specific year number.

Let's look at a specific case of overlapping circles. Here are some lines from the regional index page for New Mexico:

Peloncillo Mountains, NM {31°44'N 108°55'W} [93-109]
    Overlaps 59.2%: Peloncillo Mountains, NM {31°44'N 109°00'W} [74-92]
Peloncillo Mountains, NM {31°44'N 109°00'W} [74-92]
    Overlaps 59.2%: Peloncillo Mountains, NM {31°44'N 108°55'W} [74-92]
    Overlaps 2.3%: Portal, AZ {31°54'N 109°08'W} [73-98]
    Overlaps 0.1%: Portal, AZ {31°55'N 109°08'W} [73-98]

Suppose the user selects all four of these circles: both Peloncillo Mountains circles and both Portal circles. Here are the different reports that the user may select.

The party-hours row in the table header displays the sum of the party-hours of effort for all circles in that column.

When multiple efforts are combined in lumped presentation, how do we combine census data from different efforts in the same column? We can't just blindly sum the numbers, because some may be count week numbers and some may be questionable (flagged with the “q” field in the census record). Also, what about count-week records (flagged with the “plus” field)?

To make scattered records easier to pick out visually, we display zero counts as a hyphen (-). In general, up to four numbers may appear in one detail cell. Example: “7, 2?, 8cw, 1cw?” would mean seven regular records, two questionable, eight count-week, and one record that was both questionable and count-week.

In any case, records flagged as either questionable or count-week will not be included in the statistics cells of the row.