Pollen Viewer v3.1 v3.2 Instructions v3.1 v3.2 Acknowledgements
When you click on the image below, the Pollen Viewer 3.2 applet will open in its own browser window. Initially, the applet displays the Pollen Viewer title, a map legend, and 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 from 300K to 400K bytes. A 56K modem will take about 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, an image will appear and you will be able 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.
Pollen Viewer 3.2 controls and image window
Click here to run Pollen Viewer 3.2.
The drop-down selection list, the long text box above the map image, can be used to select any of the pre-built taxon series. Click on the down arrow on the right to review the taxon selections. Click on a name to select a new set of maps. Each time you make a selection, the selected 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.
On the left, the selection nomenclature radio buttons can be used to change the pollen selection list to Latin or English (Common) names. In either case, the selection list will be alphabetized to facilitate searching. Series that display multiple taxa can be found using any taxon that they contain. For example, the combined spruce, sedge and pine series can be found by looking up the series under spruce, sedge or pine.
The delay scrollbar lets you control the speed of the automated slideshow or animation. Moving the scrollbar 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 intermission can be overridden by using the rewind and fast-forward buttons.
The play/pause button toggles the animations on and off. When the button is labeled "Play" and you click on the button, the animation will start (the slides will display automatically), the button's label will change to "Pause", and the back ("<") and forward (">") directional buttons will be disabled (unless Compare Images is active, see below). When the button is labeled "Pause" and you click on the button, the animation will stop, the button's label will change to "Play" and the directional buttons will be enabled. Simply put, click Play to play and Pause to pause the animations.
The back and forward buttons, labeled "<" and ">", work when the animation is paused or when the Compare Images mode has been turned on. These buttons 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. When in the Compare Images mode, these buttons allow you to select a new pair of images.
The rewind and fast-forward buttons, labeled "|<" and ">|", cause the series to jump to the first or last images in the current series. They can also be used to override the animation intermission that occurs when a series completes.
The display sites 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. There is also a Site Distribution series that you can select to view the site locations without pollen in the background.
The reverse animation 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 directional buttons; back, forward, rewind and fast-forward.
The compare images checkbox enables you to automatically toggle between two consecutive images. This effect is only seen when the animation mode is on (when the Play/Pause button displays "Pause"). By speeding up the animation, using the delay scrollbar, you can flicker the images and highlight the differences between them. Play with the delay setting to obtain an optimal effect, 400 milliseconds is a good place to start.
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