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Archive Overview
This is a cloud archive of 27,858 avian nocturnal flight calls (mostly warblers & sparrows) recorded in spring 2016 from seven acoustic monitoring stations in the Towns of Somerset & Yates, NY (see map). The archive is implemented in an open-source audio/spectrogram database program called Vesper. The archive can be viewed with recent versions of the Google Chrome (recommended), Mozilla Firefox, or Microsoft Edge browsers on Windows, but not Internet Explorer. It can be viewed with the Google Chrome (recommended) or Mozilla Firefox browsers on macOS, but not Safari (Safari does not yet support some Web Audio API functionality that Vesper uses, but presumably will at some point.)

When first entering the archive, one sees a calendar of 2016 dates with data for acoustic station 1. The size of the yellow circle for a night reflects the number of calls for the night: larger circles indicate more calls. Clicking on one of the orange circles the clip calendar takes you to a *clip album* for the circle's night. The clip album contains a *spectrogram* for each clip - a visual representation of the sound with time along the horizontal axis, frequency (or pitch, roughly) along the vertical axis, and the power at a particular time and frequency indicated as darkness. To listen to a clip, move the mouse over its spectrogram and click the yellow play button that appears in the spectrogram.

A clip album is organized into *pages*, with each page containing the spectrograms of the next batch of clips in the night. You can navigate through the pages of a clip album using the two small arrow buttons to the right of the album's title, or by typing the "<" and ">" characters on your keyboard. You can also navigate to a particular page of a clip album via the "Go To Page..." item of the dropdown menu, which you can display by clicking on the rightmost button to the right of the album title. Below the clip album title is a *rug plot* that shows the calls of the clip album on a timeline. The numbers labeling the plot are hours of the night, and the plot contains a vertical mark for each clip. The marks for the clips of the current page are magenta, and the marks of other clips are yellow. You can navigate among the pages of a clip album by clicking on the rug plot. As you move the mouse over the plot the marks for the clips of the page under the mouse turn green: clicking the mouse takes you to that page. To toggle the spectrogram labels of a clip album, type the "~" (tilde) key on your keyboard.

You can change the station and classification the calendar displays by clicking on the small filter button to the right of the page title. This brings up a "Filter Clips" modal that includes "Station/mic" for specifying the station and "Classification" for specifying the species classification. (It also includes a "Detector" select, but since the archive currently contains clips for only one detector there is only one choice in this select.)

The "Classification" option of the "Filter Clips" modal contains the following species classes:
    American Redstart   
    American Tree Sparrow   
    Black-and-white Warbler   
    Black-throated Blue Warbler   
    Canada Warbler   
    Clay-colored Sparrow   
    Cerulean Warbler   
    Chipping Sparrow
    Cape May Warbler
    Common Yellowthroat
    Chestnut-sided Warbler
    Field Sparrow
    Golden-crowned Kinglet
    Grasshopper Sparrow
    Indigo Bunting
    Mourning Warbler
    Northern Parula
    Northern Waterthrush
    Nelson's Sharp-tailed Sparrow
    Palm Warbler
    Pine Warbler
    Savannah Sparrow
    Swamp Sparrow or Lincoln's Sparrow
    White-crowned Sparrow
    Wilson's Warbler
    White-throated Sparrow
    Yellow-rumped Warbler

The following items specify call types produced by more than two bird species:
    Double Up - Black-throated Green Warbler, Tennessee Warbler, Nashville Warbler, Orange-crowned Warbler   
    Zeep - Yellow Warbler, Cerulean Warbler, Blackpoll Warbler, Connecticut Warbler, Bay-breasted Warbler, Magnolia Warbler

In addition, note the two other classifications:
    Weak - when a call is too weak to classify to species
    Unknown - when a call could not confidently be put in a species class

The "Call*" item specifies all calls, rather than those of a particular species.

The archive user interface also offers a second type of clip album, called a *station clip album*. This type of clip album differs from a night clip album by showing all of the clips of a particular station and classification, instead of just the clips of a particular station and classification for one night. You can view a station clip album by selecting the "Clip Album" item from the "View" dropdown, located in the black navbar at the top left of every page. Usage of a station clip album is just like usage of a night clip album, with one exception. In a station clip album the pulldown to the right of the album title contains an extra "Filter Clips" item that allows you to specify the station and classification of the album.