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How-to Create a Vertical Offset Model (v8.16)

QINSy versions

This How-to is applicable to QINSy version 8.16. The How-to's for previous versions can be found here (Previous Versions).

This Howto describes how you can create a Vertical Offset Model (*.qgf file) using the Processing Manager and how to select it for online use.
It is a replacement of the document describing Howto Create a River Lines Model.

There are various locations where the Geoid files which are created with the Processing Manager are stored.
Use the table below to find out which files are stored where:

Installation LocationGeoid typeSource
C:\Program Files (x86)\QPS\QINSy\Geoid

No files will be installed by QINSy anymore,

Could contain previously installed or created files

QPS installers
C:\Program Files (x86)\Common Files\QPS\Geo\GeoidAll Geoid files installed by QINSy using the separate Geoid_2.0 installerQPS installers
C:\Users\Public\Documents\QPS\Shared\Geo\GeoidGeoid BIN files (Lat/Long and E/N), created from a Sounding Grid exported as GeoidProcessing Manager - User Export
Project folder\Geoid

Vertical Offset Models (VOM) in QGF format

Previously: River Line and VORF models in PRO format

Processing Manager - User Export
Common Files Folder\Geoid

Vertical Offset Models (VOM) in QGF format

Previously: River Line and VORF models in PRO format

Processing Manager - User Export


Use Line Planning Tool  to create a new geoid model either by importing an existing points file or by starting from scratch.
You can use the created DTM model as a separation model, but you can also create a grid from this DTM and use this as your separation model.

3 methods will be explained below.

Options to follow:

Method 1 - Importing ASCII points into Line data file (QGF)  "Riverlines Model"

    • 1. Press the File icon

    • 2. Select New

    • 3. Press Line File



  1. Open an existing file or enter a name for the new file in which to store the points

    Save as a QPS Graphics File (*.qgf) in the LineData folder of the active project.

  2. The new line file is listed in the Project Explorer window under the Line and CAD/GIS Files.
    A SURVEYLINES layer is automatically created. This name may be changed and additional layers can be generated.
    When the *.qgf is selected in the Project Explorer tree, the Line Tools become active:


  3. Press 'Import' - Select the file type you wish to import

    In case of VORF select: ASCII Text files

  4. Browse for the file to import, using the 'Add' button

    Press 'Next'

    Select the Layout of the points to be imported and indicate on which Layer they will be stored

    Press 'Finish' to start importing the points

  5. The points are made visible in the Plan View


  6. Use Edit Objects - Points to check on the imported points

     
  7. Press 'DTM Link' and select the Output Layer.
    If needed the link settings can be changed, the defaults are 160 degrees and 1000 meters

    Press 'OK'

  8. This will start the creation of triangles between the points. The triangle links / legs between the points will now be visible


    Press 'Undo' if links are not to your satisfaction and press 'DTM Link' again to enter different settings


  9. Press 'Export' and select 'Vertical Offset Model'


  10. Select which layer to export, set the accuracy and enter a file name, here: Imported Geoid Model Points.qgf


  11.  Under the tab Project press 'Open Containing Folder' to check that your DTM model is in the right location: 

    Project - LineData folder contains the lines and points as created in the Processing Manager.
    Project - Geoid contains the exported DTM model.

    The model needs to be stored in the Geoid folder of the project or support project you are using to be available as a Vertical Offset Model in Database Setup:


  12. The Vertical Offset Model is like a 3D Design model and can be imported into a Sounding Grid (ENH) to check if the model does not contain strange features.
    From there it can be exported as a geoid model separation grid, which creates an XML file and a BIN file, stored in the Public Shared files. This makes it available for other projects as well.
    See paragraph 'Using a grid' below.

Method 2 - Using a Sounding Grid

    • 1. Press the File icon

    • 2. Select New

    • 3. Press Sounding Grid



  1. Enter a name for the new grid

    Press 'OK' to create the grid.

  2. The new grid file is listed in the Project Explorer window under the Sounding Grids.
    A SURVEYDATA layer is automatically created. This name may be changed and additional layers can be generated.
    When the grid is selected in the Project Explorer tree, the Grid Tools become active:


  3. Press 'Import' - Import the VORF as a Design Model so select this as Fill Method

    Press 'Fill' to start filling the grid with the selected model

  4. The separation grid will be visible in the Plan View:


  5. Press 'Export' - Export the separation grid to Geoid Model to be able to use it in Database setup - selecting as Output File: Geoid.

    Pressing 'Export' creates an *.xml and a *.bin file.
    Saving these files in the Public folder will make them available for other projects as well.

  6. They need to be stored in the Geoid folder to be available as a Vertical Offset Model in Database Setup.

    You can now select the separation geoid (grid) instead of the VORF DTM model.


Method 3 - From scratch

    • 1. Press the File icon

    • 2. Select New

    • 3. Press Line File



  1. Open an existing file or enter a name for a new file in which to store the points

    Save as a QPS Graphics File (*.qgf) in the LineData folder of the active project.

  2. The new line file is listed in the Project Explorer window under the Line and CAD/GIS Files.
    A SURVEYLINES layer is automatically created. This name may be changed and additional layers can be generated.
    When the *.qgf is selected in the Project Explorer tree, the Line Tools become active:


  3. Select the Layer on which to store the lines and points or create a new layer first, using the Edit button


  4. Press 'Create Object', left-clicking in the Plan View and right-clicking to finish the line and to open the Add New Object window - Enter a name


  5. Use 'Edit Objects' to check on the created points, adding heights as necessary - lines are not used in the model, points are


  6. Press 'DTM Link' and select the Output Layer
    If needed the link settings can be changed, the defaults are 160 degrees and 1000 meters

    Press 'OK'

  7. This will start the creation of triangles between the points. The triangle links / legs between the points will now be visible


    Press 'Undo' if links are not to your satisfaction and press 'DTM Link' again to enter different settings


  8. Press 'Export' and select 'Vertical Offset Model'


  9. Select which layer to export, set the accuracy and enter a file name, here: ETRS-UTM-VORF.qgf


  10. Under the tab Project press 'Open Containing Folder' to check that your DTM model is in the right location:

    Project - LineData folder contains the lines and points as created in the Processing Manager.
    Project - Geoid contains the exported DTM model.

    It needs to be stored in the Geoid folder of the project or support project you are using to be available as a Vertical Offset Model in Database Setup:


  11. Vertical Offset Model is like a 3D Design model and can be imported into a Sounding Grid (ENH) to check if the model does not contain strange features.
    From there it can be exported as a geoid model separation grid, which creates an XML file and a BIN file, stored in the Public Shared files. This makes it available for other projects as well.
    See paragraph 'Using a grid' above.


How to apply the newly created model in Database Setup

When editing the Mean Water Level Model and/or the Vertical Datum / Chart Datum on the Geodetic Parameters pages,
select

  1. The 'Geoid Height - River Lines' option
    • If the geoid separation points are absolute heights on the selected survey datum.
      Browse for the line database.

  2. The 'Height Level - River Lines' option
    • If the geoid separation points are relative heights with respect to another geoid model.
      Browse for the line database.

Surveypoints, Geoidpoints

QINSy versions prior to 8.10.2013.04.01.1:

  1. Require that there is at least one line (route) defined on the layer 'SURVEYPOINTS'.
  2. The 'GEOIDPOINTS' layer is always re-linked when used online or in a Replay session.
    The link distance is fixed at 1000 meters.

In later versions:

  1. The 'SURVEYPOINTS' layer may be empty, and the 'GEOIDPOINTS' layer is not re-linked if already linked.

RLM Heights are applied after Projection

Please note that when a Vertical Offset Model is used as a Vertical Datum, the heights will be applied after projection.