Pollen Viewer v3.1 v3.2 Instructions v3.1 v3.2 Acknowledgements
When you click on the image below, the Pollen Viewer 3.1 applet will open in its own browser window. Initially, the applet displays the Pollen Viewer user controls, and then downloads its first set of images. The download time will depend on your modem speed. Individual map frames are approximately 17K bytes, each series of 23 maps totals about 300K to 400K bytes. A 56K modem will take from 9 to 12 seconds to download a series. While the images are downloading, you will see a "Reading image files..." message. When the download is complete, the Pollen Viewer title, a legend and a map image will appear and you will be ready to interact with the viewer applet. To the left of the screen are the controls, if you are using a low resolution screen (640 x 480) you may have to scroll down to see all the controls. You should find a column of radio buttons (small circles) with taxon labels, a delay slide bar whose label is in milliseconds, three slide/animation control buttons, a site checkbox, and a reverse checkbox.
Pollen Viewer 3.1 controls and image window
Click here to run Pollen Viewer 3.1.
The radio buttons are used to select taxon series. As the name implies, only one radio button can be selected at a time. When you make a selection a new series will download automatically. Note that if you reselect a series, your browser's cache will already have the previously downloaded image set and you will not have to wait as long for the applet to redisplay the series.
The delay scrollbar lets you control the speed of the automated slideshow or animation. Moving the slide left, shortens the delay time between frames and speeds up the frame rate. When the slide is pegged left at 100 milliseconds the slideshow moves at 10 slides/second. You can adjust the speed in three ways. Clicking on the scrollbar arrows will adjust the delay time by 100 millisecond intervals. Clicking to the left or to the right of the slide will adjust the time by 500 milliseconds. Clicking and dragging the slide will adjust the delay time by a variable amount. When an animation reaches a terminal frame, present day (Modern) or 21,000 cal. yr. BP, there will be a four second intermission before the animation restarts regardless of the delay setting.
The go/pause button toggles the animations on and off. When the button is labeled "Go" and you click on the button, the animation will start (the slides will display automatically), the button's label will change to a pause symbol, "||", and the back ("<") and forward (">") directional buttons will be disabled. When the button is labeled "||" and you click on the button, the animation will stop, the button's label will change to "Go" and the directional buttons will be enabled.
The directional buttons, labeled "<" and ">", only work when the animation is paused. These arrows replace the current slide with the previous or next slide in the series or they cycle the series if you are viewing the terminal frames of the series.
The site checkbox enables you to toggle site location symbols on and off. Each time interval has a different set of sites that were used to contour the pollen percentages.
The reverse checkbox enables you to reverse the direction of the animations. Normally, pollen maps are animated from oldest to youngest, i.e. forward in time. The state of the reverse checkbox does not effect the slide show directional buttons.
Coastal Studies Geoarchaeology Paleoclimates Vegetation Dynamics