GTILT & GTILT PLUS 3.13

Inclinometer Data Reduction and Presentation

  • Summary description

    GTILT is designed to help you handle large and small volumes of slope inclinometer data with a minimum of effort. A wide range of inclinometer probes, readouts, and loggers is supported, so, even if you use equipment from more than one manufacturer, GTILT can still handle all your projects.

    Compatible with a wide range of inclinometer equipment; imports many types of inclinometer data files directly, and comes with conversion and/or downloading utilities for others.

    A plot of the current file is visible as soon as an inclinometer is loaded, and remains visible while GTILT is running.

    Key benefits of GTILT

    • Plot of current data visible at all times
    • Easy access to raw data via 3-D readings editor
    • Draw stratigraphy, piles, tunnels, etc. directly on plots

    For users of the old DOS version:

    GTILT for Windows uses the same .GTL data file format as GTILT for DOS. The file format is enhanced to include sketch objects to be included on graphs, but remains readable by the DOS versions of GTILT.

    Working model / demonstration system

    The working model system contains models of both GTILT and GSLOPE for evaluation. You can download it from our downloads page.

  • GTILT features

    • Plots Cumulative Displacement, Incremental Displacement and Absolute Position against Depth or Elevation.
    • Plots Displacement, Shear Strain, Rate of Displacement, and Rate of Shear Strain against Time.
    • All plots are available in the inclinometer groove directions or at a skew angle.
    • Ready access to all readings using a three-dimensional editor
    • Checksums can be viewed in histogram form, allowing an immediate quantitative assessment of the quality of each dataset.
    • User-selectable plot colours
    • Reads files downloaded from a wide range of inclinometer loggers
    • Supports probes of any base length
    • Plots in Metric or Imperial units, independent of probe type
    • Top-down plots can incorporate independent surveys of surface movement
    • Lines, polylines, and text can be drawn on the plots to show stratigraphy, piles, tunnels, excavations and so on, with user-definable point sizes and colours.
    • Datasets can be marked for inclusion on all plots, on time plots only, or on no plots. For plots vs depth or elevation, individual datasets can also be toggled by clicking directly on the plot legend.
    • Exports Windows Graphics Metafiles (.WMF) for use with other applications.
    • Scales can modified by entering new ranges directly on plots.
    • Advanced readings editor which displays a checksum plot against depth alongside the tabulated readings
    • Visual link between the tabulated readings, the checksum plot, and the corresponding interval on any of the plots against depth or elevation. For example, you can click on an anomaly on the checksum plot and see immediately which reading it corresponds to, as well as which depth interval it affects on the final plot.
    • View tabulated readings in terms of the change from an earlier dataset. This makes it easier to assess whether a plotted displacement represents a flawed reading or a real movement. A display of the median change in reading for each column of raw readings also makes it easier to evaluate whether the readings have been affected by bias shift, a common type of error.
    • Downloadable free working model version available from here.
  • GTILT PLUS features (additional to GTILT standard features) - page 1

     

    Spiral Corrections

    GTILT PLUS includes a copy of the DOS-based GSPIRAL utility, which handles data from an incremental spiral tool in the same way as GTILT handles inclinometer data. GSPIRAL can create plots of cumulative and incremental casing twist versus depth, and can write spiral data files suitable for importing into GTILT PLUS.

    GTILT PLUS can incorporate spiral data into the .GTL file in which it stores the normal inclinometer data. However, the two types of data are kept separate within the file. GTILT PLUS also contains an editor for the spiral information, which is expressed in the form of degrees of cumulative twist at each reading depth. This not only allows easy checking of data, it also means that twist information can also be entered directly into GTILT PLUS, without the use of GSPIRAL. This is important if the information comes from a source other than an incremental spiral sensor.

    GTILT PLUS has a toggle which allows spiral corrections to be turned on and off. If the spiral correction is on, and spiral data is available, the correction will be applied and the plots annotated accordingly.

     

    Accelerometer Rotation and Zero Shift

    GTILT PLUS allows corrections to be applied to compensate for accelerometer rotation about a vertical axis and also for zero shift between readings in different directions. Each set of readings and each direction (A and B) can have different corrections for each parameter.

     

    Compensating for Settlement

    Where significant settlement is expected, inclinometer casings are often installed with telescoping joints to prevent the casing from being crushed longitudinally. This not only extends the life of the casing, but also may allow settlements to be monitored at various depths. GTILT PLUS can use recorded settlement profiles to correct for reading depth errors caused by settlement, without requiring complex and error-prone field protocols involving manual adjustments to actual reading depths. Another advantage of this approach is that corrections can be applied even in cases where there were originally no plans to allow for the effects of settlement.

    This type of correction can also be used to compensate for the effects of using different cables in deep holes. It can also be used to correct a depth offset in the dataset, as happens if readings are taken at odd-numbered feet where even-numbered readings are required. (It is of course better to take the readings at the correct depth in the first place.)

     

    Statistical Data Summary

    GTILT PLUS can make a statistical summary of inclinometer data, helping specialized users to spot instrument errors. This is over and above the checksum histogram feature which exists in GTILT.

     

    Converting to Metric

    If you have an installation which has been read using a probe with a 2 ft wheelbase for many years, the simplest and most accurate course of action is to continue using a 2 ft probe. However, sometimes there is a good reason why a switch to a 0.5 m probe is desirable. GTILT PLUS now includes a "Metric Conversion" function which estimates what the readings of a metric probe would have been, had it been used rather than the 2 ft probe. If you have datasets taken on the same occasion with both probes, the accuracy of the conversion can be further enhanced by using the "Force Match" feature.

    Advanced Corrections

    GTILT PLUS allows interactive corrections for bias shift and accelerometer rotation and also allows for depth corrections which can become necessary due to settlement, heave, cable stretch, length differences between cables, or readings taken from the wrong reference point.

     

    Inclinometer List

    GTILT PLUS lets you compile and save a list of inclinometers which you wish to consider together. You control the order of the list, and you can use it to batch print any desired combination of plot types for all inclinometers on the list. This is especially useful if you routinely compile reports with large amounts of inclinometer data. You can also scroll rapidly through the listed inclinometers, making it easier to compare and interpret the data and reducing the need for hardcopy plots.

  • GTILT PLUS features (additional to GTILT standard features) - page 2

     

    Statistical Data Summary

    GTILT PLUS can make a statistical summary of inclinometer data, helping specialized users to spot instrument errors. This is over and above the checksum histogram feature which exists in GTILT.

     

    Converting to Metric

    If you have an installation which has been read using a probe with a 2 ft wheelbase for many years, the simplest and most accurate course of action is to continue using a 2 ft probe. However, sometimes there is a good reason why a switch to a 0.5 m probe is desirable. GTILT PLUS now includes a "Metric Conversion" function which estimates what the readings of a metric probe would have been, had it been used rather than the 2 ft probe. If you have datasets taken on the same occasion with both probes, the accuracy of the conversion can be further enhanced by using the "Force Match" feature.

    Advanced Corrections

    GTILT PLUS allows interactive corrections for bias shift and accelerometer rotation and also allows for depth corrections which can become necessary due to settlement, heave, cable stretch, length differences between cables, or readings taken from the wrong reference point.

     

    Inclinometer List

    GTILT PLUS lets you compile and save a list of inclinometers which you wish to consider together. You control the order of the list, and you can use it to batch print any desired combination of plot types for all inclinometers on the list. This is especially useful if you routinely compile reports with large amounts of inclinometer data. You can also scroll rapidly through the listed inclinometers, making it easier to compare and interpret the data and reducing the need for hardcopy plots.

  • Screen shot 1 shows readings taken on the downstream berm of a dyke built over high plastic clay which continues to creep 15 years after construction, but otherwise performs well.
    GTILT: Screen shot 1
    Click on image to view larger version (in new window).

  • Screen shot 2 shows a Displacement/Time curve generated for a shear zone over the depth interval indicated. GTILT can generate this type of plot in the direction of the "A" grooves, the "B" grooves, or any skew angle. The vertical scale can be expressed in terms of Displacement or Percent Shear Strain. Plots can also show displacement rates per day or per year.
    GTILT: Screen shot 2
    Click on image to view larger version (in new window).

     

     

    System Requirements

    • MS Windows
    • Parallel key or USB key to operate (dongle)

Pricing

Standard prices Ex. VAT Inc. VAT  
GTILT PLUS single licence £1275.00 £1,530.00  
UPGRADE: GTILT PLUS 2.xx to GTILT PLUS (current version) £1495.00 £1,794.00  
GTILT BASIC single licence £1005.00 £1,206.00  
UPGRADE from GTILT to GTILT PLUS £365.00 £438.00  
UPGRADE: GTILT 2.xx to current GTILT £925.00 £1,110.00  
Educational / Academic prices Ex. VAT Inc. VAT  
UPGRADE: GTILT PLUS 2.xx to GTILT PLUS (current version) £295.00 £354.00  
UPGRADE from GTILT to GTILT PLUS £295.00 £354.00  
UPGRADE: GTILT 2.xx to current GTILT £195.00 £234.00