|
New menu command "Windowslist" opens a separate persistent window (floats above all other CDendro windows) where all open samples and collections are listed. Switch to another sample by clicking on an item in the list! Right click on an item to make that sample your reference!
|
|
The normalized curve of a SECONDARY reference can be shown. This is useful when you sometimes want to look at three matching curves at the same time.
To set a sample as the secondary reference, see first that its offset is correct relative to the main reference. Then right-click on the Select as reference button below the curve diagram. (The button has a tooltip about this.)
To release the secondary reference, use the menu command Samples/Set no Secondary reference selected. |
|
The Arstan program writes chronology data for type raw/std/res/ars after each other to a common file "xxx.rwl_crns" with a
trailing type marker like "std" at position 82-84 of each line.
CDendro can now also write a chronology file from the sum of a collection. This may be useful if you want to save a current sum together with the number of stems for each mean ring width.
A type of inverted .wid files with the oldest ring at the beginning of the file can now be read. They are supposed to have extension .datw. Their first numeric value is ignored as it usually is the number of ring widths. New menu command: Samples/Close All Samples. |
See our dendro wiki on normalization
Collection handling
|
|
Right-click on that button will now create a NEW mean value window and also prompt for names of this new and the previous mean value window. There is a tooltip on the button about right-clicking for this option. |
This is a useful tool when a collection is found to be correct within a certain interval but is being corrupt elsewhere.
This tool is also useful if you want to cut out a section of time with a stem density of e.g. at least 5 stems.
The first button shows offsets and correlation values for the best matching points.
The second button shows the cross correlation values for the current offsets. Example, see below!
|
(The same mechanism for saving and restoring of sample windows is much more tricky to implement - so we have to wait for that.) |
|
When a sample of unknown origin - e.g. from a ship - should be dated, or when there is no reference from the area of the sample, it
is usually best to check how well a number of reference curves match towards this sample.
In this case we have a collection with all available mean value curves from various regions. The sample to be dated is then selected as the reference. By running the button-command "Test towards reference" we get a list of how each member of the collection matches towards that sample. Such a table may be difficult to read when there are many members of the collection. Therefore you may want to check the option "With condensed report" found just below that command button. That way you get an extra sorted list with frequently recurring year numbers like this: Year numbers occurring more than once: 1792 11 1769 3 1824 2 1921 2 2010 2Note that you get this list only when the reference (=the sample to be dated) is undated! Also note, that you may want to uncheck those members giving the lowest matches towards your undated reference. This can be done by hand (click) or through the button "Select best matching members". Then you may run the button-command "Test towards reference" again and get a new report with better overall results. |
|
Collections stored in Besancon 1992 .txt ring width files can now be read by CDendro. To make the .txt files show up in the Open files dialogue box, you have to
Enable Besancon .txt file lookup in the Settings menu.
Note that this command is not able to handle "corridor normalized Besancon data" with a mean value of zero and both positive and negative "ring width values". Long member names now kept: In early test versions of CDendro the Besancon members were given a short automatically generated name like "002005" to allow for export into .rwl/Tucson files. The current solution is to allow long names when Besancon or Heidelberg files are read. These too long names for the .rwl/Tucson format can be shortened with the new command "Renumber Checked Members" and the new names also adjusted by hand (right-click a member to Edit!) before creating an .rwl file. |
|
From January 1 2010, CDendro can also read compact format files which are sometimes found in old data archives. Such files should then be given the extension ".datc" and are opened via the Collections menu command. |
Curve plotting
|
This feature can be deselected by unchecking Settings/Plotting window settings/Show number of stems behind your collection mean value curve. |
|
Block length and distance can be set through the text boxes at the lower left corner below the diagrams. Blocks may overlap. |
|
You can now select another shorter text like "_C" by a setting via the More Settings menu command. The command "Uncheck members already in target collection", will now uncheck also those members where a cropped version is within the target collection according to the name used. |
Adjusting horizontal scale by zooming
|
Horizontal curve scale can be adjusted in small steps by clicking the zoomin and zoomout icons (magnifier glass) with the RIGHT-button of the mouse. This is useful when comparing with a published curve shown in another application window when each window do not fill the whole screen, but they can be seen simultaneously. |
|
Vertical rulers checkbox now automatically checked when a sample opens and the reference sample already has vertical rulers visible. Also when you check "anchor in reference", the Vertical rulers checkbox is automatically checked. |
|
Note that the Crossdating quality test functions frame/order panel has to be enabled through Settings/Enable crossdating quality test functions. |
Workbench tab:
|
A low correlation coefficient value combined with a high standard deviation value may indicate a missing or false ring. It may also be a useful measure when looking for matches in distant chronologies when the dating is unknown. A low standard deviation value combined with a reasonable but anyhow low correlation coefficient value may then indicate an overall acceptable match. The correlation coefficient is a measure of how well two curves match at a certain overlay position. The main measure is then the coefficient calculated for the full overlapping length of the curves at the given position. When you look at a match segment by segment (block by block), the coefficient may have quite different values along the curves. The standard deviation of this sequence of correlation coefficient values may be informative when you inspect a list of possible low quality matches. The length of the blocks and the distance between them can be set. Please note that the blocks may overlap, i.e. the correlation coefficient be e.g. calculated every 10th year but then calculated for the last 30 years. A shorter block length will give you a higher standard deviation. |
|
There is an option "Extended block length test" of the "Make block correlation analysis" of the Workbench tab.
|
|
You can also have data from several methods shown in the crossdating table. Note: When you select the left Corr-coeff column to be based on Baillie/Pilcher you may nevertheless find occurences when this column differs
from the BaPicorr column above. This is probably because either your current or your reference curve is based on a collection.
|
Developed on the .NET platform
The CDendro and CooRecorder programs have been rewritten to run on the Microsoft .NET platform.
This has been done to
improve the chances that these programs will continue to run on future versions of Windows.
Another ground
for this conversion to .NET is to facilitate and enable continued software maitenance and development.
Some enhancements in the new versions
There are times when you cannot measure the full radius of a sample because a section is missing or
because rings are invisible or ring widths are too thin to be measured.
To remove an existing zero ring, shift-right-click in the curve.
Zero rings inserted or removed in CDendro can be saved in your coordinate (.pos) file and directly reloaded in CooRecorder for e.g. a tighter inspection.
(In the picture above, two zero rings are still missing.)
You can later adjust the width of such a zero ring gap in the curve diagram of CDendro.
Note 2: Be very careful when reading TTest-values for a sample containing zero rings!
That sample may give you a very high TTest value though it comes from yourself adjusting the curve to match at a certain point!
For more information on zero rings, see the section Handling zero rings
This is of great importance when samples from the same tree have been given too different identities like 6681 and 6682 instead of 6681A and 6681B.
See the section on Multi-radii collections
Properties saved with an .fh file can also be saved in a .rwl-file as comments which can later be retrieved as properties.
In this case the unknown sample is set "as the reference" in CDendro.
You can find a detailed description of how to do such a crossdating in the section Use Test Towards Reference for dating
What's new here: The crossdating report is written into a .html file. This can be now be opened and inspected
in a full size window with the menu command Collections/Open report in new browser window.
When more text is added to the report, you can update your browser window with the Refresh/Reload current page button.
This is also described in Use Test Towards Reference for dating
That table could be used as part of your crossdating report.
See the section on Import tabular data.
For export, use the menu command Collections/Write collection in tabular format
You can limit the volume of the export by checking or unchecking members of your collection. Only data of selected/checked members is exported.
It should never be used for e.g. dating of timber from a house. Dendrochronology should not be used as a tool for computer-aided guessing!
When the "Vertical rulers" checkbox is checked a vertical ruler will follow your cursor along the curve diagram (see ruler marked 1935 above).
Use ctrl-click to set (anchor) a vertical ruler across your curves (marked 1940 and 1959 above). The rulers are by default anchored in the current sample.
When the "Anchor in reference" checkbox is checked, the ruler will be anchored in the reference.
It will then also show up in the window of the reference if the "Anchor in reference" checkbox is checked also in that window.
You will see the difference between the anchoring modes when you shift your current curve in relation to the reference.
Rulers anchored in the current curve (sample) will stay with that curve, rulers anchored in the reference will stay with the reference curve.
To remove a ruler, ctrl-click on it!
Right-click on the Vertical rulers checkbox to remove all vertical rulers anchored in the current sample window.
Note:
Click in the curve diagram to get ring width information about that year displayed in the big white box below the curves.
Ctrl-click to insert or remove a vertical ruler.
Right-click to insert a zero ring.
Shift-right-click to remove a zero ring.
You should be aware that CDendro is not basically written to handle the curves plotted this way. E.g. intervals are always specified with late time first (leftmost value) and old time next (rightmost value). So I cannot recommend you to always plot your curves with old times to the left.