|Use the tilia©
program to calculate the percentages (or concentrations or accumulation rates)
from the counts file. The computer in the pollen lab (G-S 332) has a
copy of this program for your use, or you may obtain a copy free of charge from
You may obtain an T2 upgrade by clicking
but you must have a working copy of Tilia© on your computer to install it.
The pollen-diagram-plotting program Tilia Graph© costs $250.
Run the Tilia Program (Version 2.0 is needed for the NGDC data). After the start-up screen finishes, you will be presented with the following menu
Using the arrow keys, scroll down to [B] Load Tilia File, press Enter, and locate your tilia file (example, "harding.til"). If you hit Enter when you see
you will be presented with a list of tilia files in that directory. Once the file is loaded, the menu will reappear. Press [A] Spreadsheet to obtain the following screen
These are the raw counts, submitted to NGDC by the author and then modified. You must convert these counts to percentages, and then save the converted percentage file (using a new file name).
Press Ctrl-D to bring up the Dictionary |
Notice on the left, the column of sums (S) used for each type: "A" for woody plants, "B" for herbs, "F" for spores, "Q" for aquatic plants, "X" for unknown. Look through the dictionary to see how the types have been assigned to the various sums. Sums, names, and var codes can be changed in the dictionary program. Press Esc to return to the spreadsheet.
Press Alt-C to bring up the C alc menu
Press Make Sums or F3 to make the sums followed by [A] Define Sums Each of the sums in the dictionary (A, B, F, Q, X) must now be given a divisor.
Each sum can be given a name (optional) in the second column and a sum in the third column. It could be one of the defined columns; for example, the woody plants in sum "A" could be divided by "A". In the example above, the sums are all divided by "D", which is defined as A + B + X in the last row. After filling in the text in red above, press ESC twice to return to the menu shown above.
|To convert the counts in the spreadsheet to percentages, press F4 or press Enter when "Make percents" is highlighted. Save the file of percentages to a new name, example harding%.til, to avoid overwriting the counts file.|
For online information regarding the use of Tilia and Tilia-Graph, see K.D. Bennett's INQUA Data-handling Methods web page at www.kv.geo.uu.se/datah/tilia.html
and University of Missouri www.missouri.edu/~phyto/Pages/PhytoPages/Tiliamanual.html
see also running Tilia on Windows 95 98 from the Tilia list serve