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Time-series Photographs of the Sea Floor in Western Massachusetts Bay, Version 2, 1989 - 1996 Skip navigational side bar

Viewing Movies and Photographs

The movies, individual photographs, a plot of time-series data collected during the tripod deployment, and notes for each time series are available through links in table 3. The movie may be viewed using a movie player such as Imagen (available free at, QuickTime (available free at, or Windows Media Player. Click on Movie in table 3 to open the movie. Or if viewing this report from the DVD version, navigate to the .avi file (located in directories labeled TRIPODNNN, where NNN is the mooring number) and open with a movie player. See Description of Movie Frames (select from sidebar) for an explanation of the movie frame layout. Click on Photographs in table 3 to open a page of thumbnails of individual photographs; click on a thumbnail on that page to view the photograph, in .png format, at a resolution of 600 x 337 pixels. Click on Plot in table 3 to view a plot of observations (see description below). Click on Notes in table 3 (or navigate to the Notes section using the sidebar) to view comments on each time series.

An effective way to quickly scan a set of photographs is to download the movie file (.avi format) to your computer (right click on Movie in table 3 and select Save Target As...); downloading the movie allows a movie player to rapidily access the large data file and insures smooth playing without interruption. On your computer, open the .avi file with Imagen or QuickTime movie player and drag the slider with your mouse, in either direction, to navigate through the movie frames.

The data plot provides an overview of the observations recorded by the tripod system during the period of the time-series photographs. The plot includes low-passed current (as a stickplot, lines point in the direction of the current, subsampled every six hours), and hour-averaged current speed, temperature, pressure (the mean of the record has been subtracted), pressure standard deviation, and beam attenuation. The current measurements are nominally 1 m above the sea floor and the other data approximately 2 m above the sea floor. Pressure standard deviation is the standard deviation of burst pressure measurements (pressure typically sampled at 1 Hz for 5 minutes). The hour-averaged data are smoother than the data in the movie frames that are displayed at the fastest sampling interval, typically every 5 min. Abrupt changes in the hour-averaged pressure indicate that the tripod has moved or tipped over. Increases in pressure standard deviation indicate pressure fluctuations caused by surface waves. A gradual increase in beam attenuation over the deployment typically indicates fouling of the transmissometer optics. If a data panel is blank no data were collected, most likely a result of instrument failure.

Table 3. Links to photographs, movies, data plots, and notes. Click on Movie to open the movie with a movie player such as Imagen, Quicktime, or Windows Media Player. Or right click on Movie to download the .avi file to your hard drive. Some movie players allow adjustment of play speed, scanning of the movie by dragging a location slider with a mouse, and (or) control of the movie one frame at a time, forward or backward. Click on Photographs to open a page of thumbnails of the individual photographs; click on a thumbnail on the thumbnail page to view a larger-format photograph (in .png format). Click on Plot to open a plot of the time-series data collected during the tripod deployment. Click on Notes for a list of features and events of note for each set of time-series photographs. See table 4 for a list of frame date and times for each deployment.

Start date Stop date Movie Photographs Data
338 December 5, 1989 March 28, 1990 Movie Photographs PlotNotes
347 July 10, 1990 October 23, 1990 Movie Photographs PlotNotes
358 October 24, 1990 February 12, 1991 Movie Photographs PlotNotes
374 February 12, 1991 June 11, 1991 Movie Photographs PlotNotes
383 June 11, 1991 October 15, 1991 Movie Photographs PlotNotes
389 October 16, 1991 October 30, 1991 Movie Photographs PlotNotes
400 June 2, 1992 October 10, 1992 Movie Photographs PlotNotes
407 October 20, 1992 February 18, 1993 Movie Photographs PlotNotes
413 February 25, 1993 June 15, 1993 Movie Photographs PlotNotes
420 June 15, 1993 October 6, 1993 Movie Photographs PlotNotes
428 October 5, 1993 February 13, 1994 Movie Photographs PlotNotes
430 February 15, 1994 June 6, 1994 Movie Photographs PlotNotes
440 June 7, 1994 October 4, 1994 Movie Photographs PlotNotes
445 October 4, 1994 February 11, 1995 Movie Photographs PlotNotes
450 February 15, 1995 June 13, 1995 Movie Photographs PlotNotes
460 June 13, 1995 September 26, 1995 Movie Photographs PlotNotes
462 September 26, 1995 February 3, 1996 Movie Photographs PlotNotes
470 June 11, 1996 October 1, 1996 Movie Photographs PlotNotes
Table 4. Links to tables in Excel format that lists frame number and frame date and time for each deployment. Table 4.
Links to tables in Excel format that lists frame number and frame date and time for each deployment.

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