Archive Overview
This is a cloud archive of 27,858 warbler & sparrow nocturnal flight calls 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 URL is temporarily at Please do not share this URL widely, since the site can currently support only light traffic. 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.)

Clip Calendar
The site's home page is a *clip calendar* that shows the number of clips of a given station and classification for each night. The size of the yellow circle for a night reflects the number of calls for the night: larger circles indicate more calls. 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 a "Station/mic" select for specifying the station and a "Classification" select for specifying the 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" select of the "Filter Clips" modal contains many items, most of them ending in four-letter bird species codes. A future version of the archive will display full species names instead of the four-letter codes. For now, the species codes are:
     AMRE - American Redstart
     ATSP - American Tree Sparrow
     BAWW - Black-and-white Warbler
     BTBW - Black-throated Blue Warbler
     CAWA - Canada Warbler
     CCSP - Clay-colored Sparrow
     CEWA - Cerulean Warbler
     CHSP - Chipping Sparrow
     CMWA - Cape May Warbler
     COYE - Common Yellowthroat
     CSWA - Chestnut-sided Warbler
     FISP - Field Sparrow
     GCKI - Golden-crowned Kinglet
     GRSP - Grasshopper Sparrow
     INBU - Indigo Bunting
     MOWA - Mourning Warbler
     NOPA - Northern Parula
     NOWA - Northern Waterthrush
     NSTS - Nelson's Sharp-tailed Sparrow
     OVEN - Ovenbird
     PAWA - Palm Warbler
     PIWA - Pine Warbler
     SAVS - Savannah Sparrow
     SWSP_LISP - Swamp Sparrow or Lincoln's Sparrow
     WCSP - White-crowned Sparrow
     WIWA - Wilson's Warbler
     WTSP - White-throated Sparrow
     YRWA - Yellow-rumped Warbler

The following items specify call types produced by more than one bird species:

The "Call*" item specifies all calls, rather than those of a particular species. For the current archive you can safely ignore the following items, since each of them selects either no clips or the same clips as "Call*":
    * | Unclassified

Night Clip Album
Clicking on one of the orange circles of a 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. A clip album is organized into *pages*, with each page containing the spectrograms of several clips. 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 listen to a clip, move the mouse over its spectrogram and click the yellow play button that appears in the spectrogram.
To toggle the spectrogram labels of a clip album, type the "~" (tilde) key on your keyboard.

Station Clip Album
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 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.