> Or download the file (1.2 Mb) directly from:
> http://www.agri.upm.edu.my/~chris/tal/talwin42.zip

I forgot to mention that you need to uninstall your current TAL for
Windows first before installing the new version (4.2). Thank you.

Regards
Chris.

Hi all,

I am also pleased to announce that I have upgraded TAL's C++ source
code to ver 1.2. Here are the changes:

1) Now supports chart axis names. Included 3 pairs of "Get/Set"
functions to access the three chart axes.

2) Changed the protected member functions ToGRPC() and FromGPC() in
the polygon class to virtual functions so that users may modify the
type of polygons used. As it is, TAL uses polygons with no holes and
one contour only.

Futher infomation and download from:
http://www.agri.upm.edu.my/~chris/tal/talcode.html


Best wishes,
Chris.

TAL homepage:
http://www.agri.upm.edu.my/~chris/tal

Hi,

I am pleased to announce that version 4.2 of TAL for Windows has
just been released (previous version was 4.01). Here are the changes:

1) Chart axis names are now supported; no more the generic names
of "x", "y" and "z" for the axes. I have done this to clear some
confusion when some users are uncertain as to what the generic names
denote. In most (but not all) soil classification schemes, "x" is
for "sand", "y" is "clay" and "z" is "silt". With this support of
axis names, users no longer have to deal with the generic "x,y,z".

2) The program workspace is slightly larger.

Please note that because axis names are now supported, the previous
scheme definition files (*.dat) are not compatible with v4.2 because
the axis names are included in the new scheme definition files.
Consequently, if you have defined your own scheme or have modified
the given scheme files, please refer to the provided help file as to
how to include the chart axis names (very easy to do, actually). You
can also contact me if you have further enquiries or need help.

You can check out the new version at:
http://www.agri.upm.edu.my/~chris/tal/talwin.html

Or download the file (1.2 Mb) directly from:
http://www.agri.upm.edu.my/~chris/tal/talwin42.zip



Best wishes,
Chris

TAL homepage:
http://www.agri.upm.edu.my/~chris/tal

Hi,

All of TAL's programs including that for Excel and Windows work with
no problems in Windows XP.

Best wishes.

====== ORIGINAL POST ======
At 12:43 AM 07-06-02, you wrote:

Chris, I have been looking more closely at the different systems
available in TAL and am a little confused with the French Aisne
system.
Going on your standard of X being sand and Y being clay (as defined in
'how to define your own scheme'), in the following polygon for 'sable'
(which I take to be 'sand') a sample with 5% sand and 95% clay would
actually come out as sand!

sable
15
0 87.5
0 100
20 80
7.5 80
#

Does the 3rd line in the dat file

(x, y, z): (limons 0.002-0.05, sables 0.05-2.0, argile <0.002)

imply that the x axis is actually silt, the y axis is sand and the z
clay? Most other systems seem to work on your standard of X being sand
and Y being clay. This seems to be the only way I can get it to make
sense.



====== REPLY ======
Hi,

         Though I have never used the French scheme before, the scheme
definition file TAL uses was based *exactly* on a chart I got from a
soil textbook by a French author who, in turn, got it from a French
journal as stated in the scheme info.

         To answer your question, the line of "(x, y, z): (limons
0.002-0.05, sables 0.05-2.0, argile <0.002)" in the Aisne scheme file
means that x, y and z axes are silt, sand and clay, respectively.
This order can change according to the scheme type but for most
schemes (including USDA and UK), the order is usually sand, clay and
silt, respectively. I have looked at several schemes, and yes, the
meaning of the x, y and z axes are not "standardised" and they can
vary from scheme to scheme. You can also look at the INEAC scheme --
very surprising!

         In short, the meaning of the x, y and z axes for a particular
classification scheme are based exactly on the soil charts I have
found; I have not re-orientated the axes so they conform to the
standard of x axis always being the sand and y axis the clay.

         I hope this helps.

Best wishes
Chris

Dear alls,

Thailand, by courtesy of the Soil and Fertilizer Society of Thailand, has received an honor to host the 17^th World Congress of Soil Science, which will be held during August 14-21,2002, at Queen Sirikit National Convention Center, Bangkok, Thailand. This congress is under the topic of "Soil Science: Confronting New Realities in the 21 Century." It is considered to be the first soil science congress of the new millenium. Also, it is aimed at setting up the ground work for current essential research and development; and focuses on condition of the earth, which contributes to the subsistence level of human society; as well as its potential to respond to the needs of the world population. For over one week, the purposes are exchanging views, experiences, and new techniques for the research and development of soil science.

http://www.17wcss.ku.ac.th

--- Forwarded Message ---

Hi,

         Thanks for highlighting the problem. I rarely used Trixcel
myself though I modified the original program to remove some bugs and
translated it into English (somewhat). But I think I understand your
problem. Whenever Trixcel draws the chart, it creates a hidden
worksheet, and its name has the format of "Triangle<no.>Data" where
<no.> is the chart sequence, e.g., 0, 1, 2, and so on. It is in this
hidden worksheet that your input chart data is converted into chart
coordinates and stored so that it is actually the chart coordinates
that is plotted and not exactly what you entered. The chart appears
to plot your entered data exactly because it has the labels 10, 20,
30, and on, but actually the chart coordinates is the one that is
used.

         Consequently, when you copy and paste a source chart,
intending the new chart for fresh data plotting, the target chart
unfortunately still maintains the old links to the same hidden
worksheet as the the source chart. So any changes to the first data
set affects the second chart as well because they all belong to the
same hidden worksheet. To overcome this problem, you have a fair bit
of work to do:

1) From the main menu, choose Format|Sheet|Unhide. From the list,
choose the worksheet with the name "Triangle<no.>Data".

2) Create exact copies of the worksheet "Triangle<no.>Data" based on
the number of charts you have minus one. So if you have 3 charts,
then create 2 copies of the worksheet "Triangle<no.>Data", and give
them a sequential numbering, e.g., if the original worksheet
is "Triangle0Data", then the next two copies should have names
like "Triangle1Data" and "Triangle2Data". To create copies of the
worksheet, ensure the "Triangle<no.>Data" worksheet is current (i.e.,
you are currently viewing it and the worksheet tab with the
name "Triangle<no.>Data" at the bottom of your screen is
highlighted). Then choose from the main menu: Edit|Move or Copy
Sheet. In the dialog box,
click the option "Create a copy", and click OK. Modify the names of
the worksheet copies to the format as given previously.

3) For each chart, click on any point. You will see the function in
the function window. Modify the link from the original
worksheet "Triangle<no.>Data" to the newly copied
worksheet "Triangle<no.+1>Data".

4) Now go to the worksheet "Triangle<no.+1>Data" and modify the old
links from cell B26 onwards to the where the new chart is located.
For example, if the copied Chart2 is in Sheet2, then modify the
links "Sheet1" to "Sheet2" because that is where the copied chart is.
Instead of individual modifications you can make sweeping changes in
a go by choosing the Edit|Replace option from the main menu to find
every occurance "Sheet1" and change it to "Sheet2".

         I hope this helps.

--- Original Message ---

At 09:13 PM 21-03-02, you wrote:

Chris...
I recently informed you of downloading your Ternary diagram software
for Excel. I have a problem which I'm hoping you might be able to
assist with.

I am attempting to produce a number of Ternary diagrams from one
spreadsheet. However, after producing one diagram and going on to
produce the second, the data plot of the first is changed to mirror
that of the second. Obviously this isn't what I want! The charts I am
producing are looking fanatastic, but I'm only able to temporarily
produce one at a time - no use at all for paper writing!

I've tried a number of approaches, but all either do not work or
would be too time consuming for their realistic application...what do
you suggest?

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…..We borrow it from our Children"
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Hi,

    Dr Simon Six has contributed a data file for the Shepard's (1954)
soil classification scheme. The file can be used with TAL for
Windows. You can get the zipped file (1k) directly at:

    http://www.agri.upm.edu.my/~chris/tal/shepard.zip

    Once downloaded, unzip the archive and store the shepard.dat file
any where you like, but preferably together with other scheme data
files (*.dat). By default, scheme data files are all stored
in "c:\program files\talwin\schemes\".

    If you have any other schemes, please let me know. I am still
waiting for the Netherlands scheme, and those for engineering schemes.

Regards,
Chris.

Thanks,
It's funny this arrived the same day I "UNSUBSCRIBE" form that very same
site !
Onwards and upwards so they say ?

Walt
----- Original Message -----
From: "C.B.S. Teh" <c.b.s.teh@...>
To: <texture-autolookup@yahoogroups.com>
Sent: Sunday, May 27, 2001 10:19 PM
Subject: [TAL] Moved site


> Hi,
>
>    Texture AutoLookup (TAL) has moved to a new location:
>
>    http://www.agri.upm.edu.my/~chris/tal/
>
> Please update your bookmarks. The old site at NBCi will no longer be
> updated, but it has a link to TAL's new website. Hopefully, my
> problematic affair with my previous web host NBCi will finally be
> laid to rest by this move.
>
>    By the way, my homepage, after 3 years 8 months, has finally be
> updated! If you have problems sleeping, why not surf to:
>
>    http://www.agri.upm.edu.my/~chris
>
> ;-)
>
> Regards,
> Chris.
>
>
>
> To Post a message, send it to:
> texture-autolookup@eGroups.com
>
>
> To Unsubscribe, send a blank message to:
> texture-autolookup-unsubscribe@eGroups.com
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>

Hi,

    Texture AutoLookup (TAL) has moved to a new location:

    http://www.agri.upm.edu.my/~chris/tal/

Please update your bookmarks. The old site at NBCi will no longer be
updated, but it has a link to TAL's new website. Hopefully, my
problematic affair with my previous web host NBCi will finally be
laid to rest by this move.

    By the way, my homepage, after 3 years 8 months, has finally be
updated! If you have problems sleeping, why not surf to:

    http://www.agri.upm.edu.my/~chris

;-)

Regards,
Chris.

Dear TAL users,

    I decided to release TAL for Windows version 4.01 a little earlier
than expected. This version is a minor update, and its changes are:

1) Users can now insert or delete an entire row of cells in the grid

2) Moving the mouse pointer within the chart displays the current
chart coordinates, and added support to the right mouse button.

3) Chart axes values now include 0% and 100%, and the axes titles are
moved to a better position.

    If you are currently using version 4.0, there is an easier way to
upgrade. Please download this file (80 kb):

    http://members.nbci.com/drsoil/upg401.zip

Unzip it, and run the file upgrade.exe. This will upgrade the
existing ver 4.0 to 4.01. This upgrade will also add the German
scheme files if you haven't already downloaded them previously.

    Alternatively, uninstall your current TAL for Windows (whatever
version it is), and download the full setup program (1.1 Mb):

    http://members.nbci.com/drsoil/talwin401.zip

Unzip it, and run setup.exe for a full installation.

    Note that you can determine which version you are using by running
TAL for Windows, then going to its main menu: HELP then ABOUT. You
should see the version that you are currently using. Also note that
uninstalling TAL does not remove your own data files; they are always
ignored even if they are kept at the same location with TAL files.

    After a flurry of TAL activity in this last 2 months, I am taking
a little break from developing TAL, but I am still happy to receive
any comments or suggestions (sigh, even bug reports). I will make any
modifications or improvements to TAL if deemed urgent. For the next
few months I will be very busy moving to Malaysia, handling a
backlog of papers to write (major concentration and will power needed
here), and doing the final touches of my other model (called x-model
for radiation and evapotranspiration partitioning in intercrops).

    Ok, that's it for now.


Regards,
Chris.

Hi,

    Dr Detlef Deumlich has contributed some data files for the German
soil classification schemes. These files can be used with TAL for
Windows. You can get the zipped file (2k) directly at:

    http://members.nbci.com/drsoil/ka4.zip

Once downloaded, unzip the archive and store the 3 files any where
you like, but preferably together with other scheme data files
(*.dat). By default, scheme data files are all stored in "c:\program
files\talwin\schemes\".

    I have also updated the TAL C++ source code to ver. 1.1, and made
some minor changes to the TAL website. However, at the moment, my web
host NBCi is, as usual, mucking about with their server (which can
take 1 week), so TAL website is either down or takes forever to load.
I think this only highlights the importance of me moving the TAL
website back to my university server (which, unfortunately, solves
one problem but raises another: my university server is maintained by
over-protective and over-zealous network adminstrators). Anyway, I
will definitely let you all know when TAL moves site.

    If anyone wishes to contribute other classification schemes,
please let me know and I will add them to the site and inform other
users. In particular, I am looking for the Netherlands scheme. I do
have their charts but some borders are vague (e.g., is it 17 or
18%?).

    I am working on a minor update to TAL for Windows (probably
version 4.01), but its release will probably happened after I have
moved TAL website perhaps in July.

    I will keep you all posted. Thanks.

Regards,
Chris

Hello,

TAL for Windows:

    I am glad to announce that TAL (Texture AutoLookup) for Windows
version 4.0 was released yesterday. The following are the changes:

1) New feature: Charting capabilities added. Charts can be re-sized,
copied to clipboard, saved to file, and printed.

2) New feature: TAL now supports custom (user-defined) soil
classification schemes. In addition, TAL now comes with 11 soil
classification schemes: USDA, UK, Canada, International, India, ISSS,
Switzerland, INAEC, New Zealand, FAO, and Aisne.

3) Improved: Cell navigation in the grid is now easier and more
intuitive.

4) Added a "Sample ID" column to the grid for sample number/ids.

5) Big fixed: Printing the data set from the grid has been corrected.
no more "jumbled characters".


TAL for Excel:

    As you might realise, Microsoft Excel does not draw tri-axial
charts like in soil texture charts. TAL for Excel also does not have
any charting capabilities.

    Nevertheless, you can use Trixcel written by Julien Furrer. This
is a free Excel add-in that draws tri-axial charts in Excel. However,
Trixcel was written in French, has a few (but small) bugs, and draws
the x-axis in the reverse direction from what is found in soil
texture charts.

    Consequently, I have translated Trixcel into English, corrected
the bugs, and modified Trixcel so that it draws the charts the "right
way round". You can use my modified version of Trixcel in conjuction
with TAL for Excel.


Website:

For further information, and free downloads, please go to:

http://members.nbci.com/drsoil/tal.html


Regards,
Chris

Hi,

I have just released the C++ source code for TAL. This source code
will be used in future versions of TAL because it supports
user-defined soil classification schemes. You can view the source
code from:

http://members.nbci.com/drsoil/talcode.html

From the above sites, you will also find data files for several more
classification schemes.

Regards,
Chris.

Hi,

I apologise yet again that there are two bugs in TAL for Windows
3.0a that affects accuracy of results. I have released ver. 3.0b that
fixes these bugs:

1. Bug fixed in Range Lookup: Silt class was mis-specified for the
USDA and Canadian schemes. This is a minor bug because it only
happens for extremely narrow ranges.

2. Bug fixed in Point Lookup: Sand values were mistakenly taken as
Silt values, and vice versa. This is a major but blindingly obvious
bug! But how it got through my debugging sessions, I don't know!

I was perhaps a little too over-confident in releasing such a major
version without debugging it thoroughly enough. Ver. 3.0 is actually
a version in transition, in preparation for the feature whereby users
can add or create their own classification schemes (ver. 4.0). Also,
ver. 3.0 has completely revamped its graphical user interface; again
in preparation for ver. 4.0.

You can get the corrected version 3.0b from here:

http://members.nbci.com/drsoil/talwin3b.zip


Regards,
Chris.

Dear TAL users,

Bug fixed in Range Lookup: Two texture classes (sandy loam and silt
loam) was mis-specified in the USDA and Canadian schemes. This has
been fixed in ver. 3.0a.

Thousand apologies if you just download v3.0 only to need a new v3.0a
shortly after. I usually don't fix bugs this quickly unless they
affect accuracy of results.

You can get the v3.0a from the following sites:

http://members.nbci.com/drsoil/talwin.html

(if the above site is too slow):
http://drsoil.freehomepage.com/talwin.html

Regards, Chris

Hi,

	 TAL files are distributed as .zip archives. Once downloaded, you have
to use a separate Decompression software to unzip the archive. The
following are some archive software which you can use:

CAMUnzip (freeware)
www.camdevelopment.com/cuz.htm

Winzip (commercial)
www.winzip.com

PkZip (commercial)
www.pkware.com

	 All the above archive programs work on the Windows operating systems
(OS). There are archive software for other OS. The EPOC OS on the Psion
5mx, for example, has some archive software:

zippy (freeware)
pages.eidosnet.co.uk/monojohnny

RMRZip (shareware)
www.rmrsoft.com/

	 Hope this helps. If you still have problems, or do not wish to download
aan archive software, let me know and I will send files to you by email.

Chris.

>
> I was never able to utilize TAL from the beginning on my computer.  For some
> reason I couldn't get the files to open.  But, I am very interested in using
> the program.  Could I load the entire program from the website?
>
> Thanks for your help!  I'm looking forward to using this program!

Chris,
I was never able to utilize TAL from the beginning on my computer.  For some
reason I couldn't get the files to open.  But, I am very interested in using
the program.  Could I load the entire program from the website?

Thanks for your help!  I'm looking forward to using this program!

Peg Cook

pegcook@...

----- Original Message -----
From: Chris <c.b.s.teh@...>
To: <texture-autolookup@yahoogroups.com>
Sent: Wednesday, February 14, 2001 6:46 AM
Subject: [TAL] Ver 3.0 Released & Some Important News


> Dear TAL users,
>
> Well, with great amounts of will-power, I finally forced myself to
> sit
> down over the weekend and concentrate on upgrading one of TAL family
> members: TAL for Windows. Please note the name change from "TAL
> Calculator" to "TAL for Windows". This name change is because TAL for
> Windows is now a more powerful program than its ver. 2.8. Ver. 3.0 if
> a major release. Here are the changes in ver. 3.0:
>
> 1) "TAL Calculator" is now called "TAL for Windows".
>
> 2) New feature: Range Lookup is a feature whereby for given a
> particle-size distribution range, TAL can list all texture classes
> within that range. For example, in the USDA scheme, TAL reports the
> following texture classes for 30-50% clay and 10-30% sand: "clay,
> silty clay, silty clay loam, and clay loam".
>
> 3) New feature: TAL can now handle large data sets up to 1000 soil
> samples.
>
> 4) New feature: Added file saving and loading capabilities (as well
> as
> printing)
>
> 5) User interface completely changed. A major change is that data
> entry and output in TAL now mimics spreadsheet cells as found in
> Excel
> and Lotus 123.
>
> 6) Users no longer need to set any options (such as default soil
> schemes) manually; options are saved automatically based on last used
> settings.
>
> 7) Corrected some errors in the help file.
>
>
> What is being planned next are:
>
> 1) Charting capabilities (hardcore graphics programming -- major
> concentration and will-power needed here)
>
> 2) Feature for users to add or create their own soil classification
> schemes (quite easy to implement, actually)
>
> 3) Adding the German soil scheme (easy as well, but I have two German
> charts that contradict each other!)
>
>
> You can get all of TAL files from:
>
>    http://members.nbci.com/drsoil/tal.html
>
> Please note the the web address above is slightly different from the
> old address. The old address was:
>
>    http://members.xoom.com/drsoil/tal.html
>
> Nevertheless, if you use the old address, you will still be
> redirected
> to the new address. Xoom.com was recently taken over by NBCi.
>
> I have revamped the entire TAL website, so it is worth taking a look.
> The colour of the day is purple (you will see what I mean if you surf
> there). Please Reload/Refresh the webpage if you see the lots of
> green
> (NBCi server might still store the old pages of TAL in the server
> cache).
>
> I am also planning to move TAL website back to my university server
> sometime middle of this year. I am not too happy with NBCi's
> increasingly slow server. I only ask for your patience if page
> loading
> seems to take eons. I will let you all know when TAL website moves,
> and if you maintain any bookmarks or links to this current address,
> don't worry. I will still put links on the old site, redirecting you
> to the new site.
>
> Thanks.
>
> Regards,
> Chris
>
>
>
>
> To Post a message, send it to:   texture-autolookup@eGroups.com
>
>
>
> To Unsubscribe, send a blank message to:
texture-autolookup-unsubscribe@eGroups.com
>
>

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the texture-autolookup
group.

   File        : /Files/talwin3.zip
   Uploaded by : c.b.s.teh@...
   Description : TAL for Windows 3.0

You can access this file at the URL

http://groups.yahoo.com/group/texture-autolookup/files/Files/talwin3.zip

To learn more about file sharing for your group, please visit

http://help.yahoo.com/help/us/groups/files

Regards,

c.b.s.teh@...
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms

Dear TAL users,

Well, with great amounts of will-power, I finally forced myself to
sit
down over the weekend and concentrate on upgrading one of TAL family
members: TAL for Windows. Please note the name change from "TAL
Calculator" to "TAL for Windows". This name change is because TAL for
Windows is now a more powerful program than its ver. 2.8. Ver. 3.0 if
a major release. Here are the changes in ver. 3.0:

1) "TAL Calculator" is now called "TAL for Windows".

2) New feature: Range Lookup is a feature whereby for given a
particle-size distribution range, TAL can list all texture classes
within that range. For example, in the USDA scheme, TAL reports the
following texture classes for 30-50% clay and 10-30% sand: "clay,
silty clay, silty clay loam, and clay loam".

3) New feature: TAL can now handle large data sets up to 1000 soil
samples.

4) New feature: Added file saving and loading capabilities (as well
as
printing)

5) User interface completely changed. A major change is that data
entry and output in TAL now mimics spreadsheet cells as found in
Excel
and Lotus 123.

6) Users no longer need to set any options (such as default soil
schemes) manually; options are saved automatically based on last used
settings.

7) Corrected some errors in the help file.


What is being planned next are:

1) Charting capabilities (hardcore graphics programming -- major
concentration and will-power needed here)

2) Feature for users to add or create their own soil classification
schemes (quite easy to implement, actually)

3) Adding the German soil scheme (easy as well, but I have two German
charts that contradict each other!)


You can get all of TAL files from:

    http://members.nbci.com/drsoil/tal.html

Please note the the web address above is slightly different from the
old address. The old address was:

    http://members.xoom.com/drsoil/tal.html

Nevertheless, if you use the old address, you will still be
redirected
to the new address. Xoom.com was recently taken over by NBCi.

I have revamped the entire TAL website, so it is worth taking a look.
The colour of the day is purple (you will see what I mean if you surf
there). Please Reload/Refresh the webpage if you see the lots of
green
(NBCi server might still store the old pages of TAL in the server
cache).

I am also planning to move TAL website back to my university server
sometime middle of this year. I am not too happy with NBCi's
increasingly slow server. I only ask for your patience if page
loading
seems to take eons. I will let you all know when TAL website moves,
and if you maintain any bookmarks or links to this current address,
don't worry. I will still put links on the old site, redirecting you
to the new site.

Thanks.

Regards,
Chris

Hi all,

I am about to release TAL for Windows version 3.0 (formerly known
as TAL Calculator). This will be a major release mainly because it:

1) can handle large data sets (up to 1000 soil samples) with file
saving and loading facilities.

2) mimics spreadsheet capabilties where data is entered and texture
results are displayed in cells.

3) can handle range texture lookups, e.g. listing all texture classes
for a given range of, say, 30 to 50% clay and 30 to 70% sand.

At the moment I am writing the help file and revamping the TAL
website. But once I am done, I will let you know when the files are
available.

Oh yes, did I mention TAL is still completely free?


Regards,
Chris.

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the texture-autolookup
group.

   File        : /Files/talopl28.zip
   Uploaded by : c.b.s.teh@...
   Description : TAL v2.8 for Psion 5/5mx

You can access this file at the URL

http://www.egroups.com/files/texture-autolookup/Files/talopl28%2Ezip

To learn more about eGroups file sharing, please visit

http://www.egroups.com/help/files.html


Regards,

c.b.s.teh@...

Hello TAL users,

If you own the handheld Psion series 5 or 5mx, you can now use
Texture
AutoLookup (TAL) on it! You can now carry your favourite handheld to
the field site with TAL! Please email me directly and I will send the
necessary files to you via email attachment. The reason for this
rather than downloading it from the TAL website is that I have yet to
get an official UID code from Symbian Corp. for TAL.

This TAL version for Psion 5/5mx works for 4 major soil
classifications. In addition, TAL can display the texture triangles
as
images. As usual TAl is free.

Please email me directly at c.b.s.teh@... for the TAL for
Psion 5/5mx. Or reply to this mailing list.

Thanks.

Chris.

Hi,

In case you wish to see how a Psion 5mx looks like, you can check out
this website:

http://www.series5mx.com/welcome.html

Regards, Chris.

Hi TAL users,

There is another software available to determine USDA soil texture
classes by Johan Liebens. You can peek at his Excel macro at:

http://uwf.edu/environmental/faculty/liebens/macro.cfm

I believe his macro works on Excel97 onwards.

As to TAL's much-awaited version 3.0, I am still working on it! I
have actually got around writing down the algorithm on paper, but I
always seem to be too busy or distracted to do the programming
proper. Anyway, will keep you all posted.


Regards,
C.B.S. Teh
Uni. of Reading, UK

Greetings,

The text I wrote that was just sent by Christopher was originally written in
response to a request on the DSSAT modeling list server.  A student in a
geography department wanted to take textural classes and determine specific
textures.  I was concerned from his original request that he needed to
consider exactly what he was trying to do, because it sounded like he
thought there would be only one set of sand/silt/clay numbers per class.
And, while I was responding, it developed into a discussion of the problems
to accomplish this.  I forwarded it to Christopher to add to the discussion
when I saw his posting about the reverse lookup.

Hope the discussion helps out some.

John

==============================================================
E. John Sadler, Ph.D.
USDA-ARS                          sadler@...
Coastal Plains Soil, Water,       http://www.florence.ars.usda.gov
    and Plant Research Center      843-669-5203x112 (voice)
2611 West Lucas St.               843-669-6970 (fax)
Florence, SC 29501-1241
U.S.A.

Hi,

Here's are some suggestions from John Sadler about the possibilities
of meeting TAL's next "big" version to incorporate a "reverse" lookup.


--------------------
Given that the specification of sand and silt is not unambiguous when
provided
with textural classification and %clay, I wonder why you want to do it.
Whatever your reasons, I think you are going to have to do this
yourself.

I see at least three options: Make a table of the various textural
classes.
The simplest approach will just return a single set of %Sa, %Si, and
%Cl for
each texture, such as the middle of the polygon.

A second approach will return a range of sand and silt for a texture
and a
given clay content.  For it, there will be a max and min sand paired
with a
max and min silt.  If you want, you could state min and max sand for the
clay content and compute the silt as the residual, since clay and the
sand
extremes are known.  This will get somewhat extensive, but is as
specific as
you can get and keep the table simple.

A third approach would provide either a line segment that describes the
family of possibilities or possibly just create a family of values
corresponding to the %sand, for instance, at the resolution you choose.
  If
you want sand in integer %, then for a class with a range of 70-80%
sand,
there would be a set of 11 triplets describing all the
integer-resolution
combinations that stay within the textural class.

My personal choice for a solution, were the third option best, would be
to
create an equation describing the sand %, given the textural class and
clay
%, from the min and max sand in that class, and use it to describe the
possible combinations.  But you could perform this calculation for all
integers and make a look-up table if you wanted.
----------------

Hi,

Hello everyone. Thought I drop a line saying I am planning to do a
major version of TAL some time soon. This new version will probably
incorporate a "reverse" lookup where you specify a texture class, and
TAL gives the % of the primary particles meeting that texture class.
Hope it works.

As usual, I am pretty busy at the moment, so don't hold for your breath
yet! I am thinking along these lines. Any comments and suggestions
gratefully welcomed.

Hi,

This is the new mailing list for TAL. The previous mailing list at Reading Uni.
account will be terminated very shortly. From now on, any information will be
from this mailing list. This new list is for any TAL updates, bugs, and fixes.
Mail traffic is intentionally kept very low. However, feel free to use this list
to communicate thoughts, ideas, and suggestions.

Regards,
Christopher Teh Boon Sung