Often it can be a major problem to process the amount of hydrological data generated by data loggers, the data length can easily exceed the maximum size of a column in a spreadsheet. Even if the data fits in a spreadsheet a simple calculation can take a long time, the data is normally displayed as numbers which makes it difficult to get a good overview of your measurements.
 

By using the TLDE program all these shortcomings can be overcome. The TLDE program displays the data graphically and many data sets can be loaded into one chart so data can be easily analyzed. With the zoom function each detail can be shown. Data can be imported and exported from ASCII files so that existing data or data retrieved from other instruments can be combined with logger data. A separate program, TirtaLog Control, is included to retrieve the data from the logger.

Data can be easily organized and documented since all the data for a project can be stored in one file, a description and an image can be added to each graph. Several processing functions like resampling smoothing, merging, moving, and subtracting can be applied fast and easy. A powerful macro language is provided to manipulate and calculate data. For presentation purposes you can add text and markers.

The TirtaLog Software (TLS) can be downloaded for update of your current copy or trial.

Depending the size of your data set a Pentium 200Mhz computer is recommended with 32 Mb of RAM. TLDE runs under Microsoft Windows 9x, ME, NT4, 2000, XP.

Some of the available functions are:

• Move graph
• Edit graph entries
• Cut/copy/paste
• Import and export to and from ASCII files
• Resample graph
• Stretch graph
• Smooth graph
• Extensive macro functions
• Measure distance between two points
• Calculate average between two points
• Zoom in/out
• Pan
• Print
• Add text and markers to the chart
• Merge, Split, Crop graph
• Undo/Redo
• Graph Math (add, divide, subtract, multiply with graphs), replaced subtract graph
• Discharge calculation with rating curves and cross sections by using a visual editing tool

New in TLDE 3.0

• Time resolution has changed from one minute to one second for support of new TirtaLog 3.
• Zoom in/out with mouse wheel
• Help system has changed. Now the windows 98/2000/XP html help system is used. On windows 95/NT you should update your system with this new help format in order to be able to view this help file.
• Save as .bin file has been removed. This was only used for compatibility with the DOS program which is not supported anymore.
• Resample allows new intervals in other units than minutes. New intervals can be entered in seconds, minutes, hours, days and weeks.
  

Below is a screen dump of the cross section editor. This allows you to create a rating curve from a cross section. Rating curves can also be imported directly.

Macro's
A small sample of a macro function that searches for the maximum and minimum point in a graph, the begin point and the end point can be selected by the user:

DECLAREGRAPH @ingraph

DECLARE max

DECLARE min

SELECT @ingraph

max:=-1

min:=100000

RANGELOOP

IF @ingraph.data>max

 max:=@ingraph.data

END_IF

IF @ingraph.data<min

  min:=@ingraph.data

END_IF

END_RANGELOOP

WRITEVAR max

WRITELN ' is the maximum value'

WRITEVAR min

WRITELN ' is the minimum value'