MensorGIS Survey and Cartography Tutorial


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This Tutorial shows a Topographic Mapping. You learn about




MensorGIS uses two independent Reference Systems (Menu „Reference Systems“): If you start up MensorGIS with Standard Preferences as well the Main System as well as the Import/Export System is set to „geographic“ with Datum „WGS84/ITRF“.
You may change the Main System to a projected System at the beginning. The Import/Export System always must be set conformly to the Data you want to import or export.


Beneath the typical CAD and GIS Data Formats also CSV Data (Comma Separated Values) may be available. MensorGIS can import CSV Data with identical Columns.


Attributive Data are essential for GIS Functionality; Mensor GIS allows (Menu „Data“):
Geodetic Transformations allow the change of the Coordinate System from a local System to the national System and vice-versa. MensorGIS offers:

A typical Cartographic Functionality is Generation of Height Contour Levels (Menu „Height Data“):



Now to our tasks:
Overview:
  1. Import Fixed Points from national projected Coordinates on Central Meridian 12 to the same national projected Coordinates on Central Meridian 9.

  2. Editing Attribute Names and Creating a new Object Class.

  3. Visualizing Text from Attribute Values.

  4. Import Mapping Measurement Points from local Polar Coordinates to the national projected Coordinates on Central Meridian 9.

  5. Computing Height Contour Levels and editing Cartographic Layouts.



Now to our first task after starting up MensorGIS or beginning a new Project („File - New“):

Set the Main (Coordinates) System
  1. Menu „Reference Systems - Main System“ -> Window „Main System“:

  2. select Type „projected“

  3. select Projection „GK(D)“ (Germany)

  4. type in Central Meridian „9“

  5. select Unit „Meter“

  6. select Datum „Bessel/DHDN“

  7. press „Save“


Set the Import/Export (Coordinates) System (for the next Import)
  1. Menu „Reference Systems - Import/Export System“ -> Window „Import/Export System“:

  2. select Type „projected“

  3. select Projection „GK(D)“ (Germany)

  4. type in Central Meridian „12“

  5. select Unit „Meter“

  6. select Datum „Bessel/DHDN“

  7. press „Save“


Remarks on the Geodetic Projections:

Import the CSV Data File „CT_FixedPoints.dat“
  1. Menu „File - Import - CSV Data“

  2. select „CT_FixedPoints.dat“

  3. answer the Question on Identity Check with „No“

  4. -> the Window „Import CSV Points“ is shown

  5. select the empty Separation Character (3rd Alternative) and press „Start Prescan“

  6. -> 4 lines are shown on the left side

  7. in the ComboBox over the right side select „Create new Object Class“

  8. -> 4 lines are shown on the right side

  9. pick on the left side the 5-digit Point Number (1st line) and on the right side „attr1“ and press „Add“

  10. -> a line appears in the DataGridView below

  11. pick on the left side the Easting beginning with '4' (now 1st line) and on the right side „X (Long/Easting)“ and press „Add“

  12. pick on the left side the Northing beginning with '5' (now 1st line) and on the right side „Y (Lat/Northing)“ and press „Add“

  13. pick on the left side the Height (now 1st line) and on the right side „attr2“ and press „Add“

  14. -> 4 lines are now in the DataGridView below

  15. let the Options as they are (Scaling Factor 1.0 / don't Ignore First Line)

  16. press „Start Import“

  17. -> the Message Text says „7 Points imported“

  18. press „OK“ to close this Window



Change the Attribute Names of the recently created Object Class „CT_FixedPoints“
  1. Menu „Data - Schema - Schema Tree View“

  2. -> the Window „Schema Tree View“ is shown

  3. click on the '+' Sign left of „CT_FixedPoints“

  4. -> the Attributes 4 are shown

  5. click on the „attr1“

  6. -> below you can edit this Attribute; delete the old name and type in 'No'

  7. press the Button „Save“ to save the changes for this Attribute

  8. click on the „attr2“

  9. -> below you can edit this Attribute; delete the old name and type in 'Height'

  10. press the Button „Save“ to save the changes for this Attribute

  11. close the Window (OK)


Create a new Object Class for the measured Points (that you will transform into the Project Data Set later)
  1. Menu „Data - Schema - New Object Class“

  2. -> the Window „New Object Class“ is shown

  3. choose the Graphic Type „Point“ and type in the Object Class Name „MapMeasurement“

  4. then type in the first Attribute Name: 'No' and press the Button „Add Attribute“

  5. -> a line appears in the DataGridView below; press the Button „Clear“ to reset the Input

  6. then type in the second Attribute Name: 'Height' and press the Button „Add Attribute“

  7. press the Button „Save“ to create the new Object Class and its Attributes

  8. -> a MessageBox says that the Object Class „MapMeasurement“ was saved

  9. close the MessageBox and then the Window (OK)


Remarks on Attributive Data:

Visualize the Points' Numbers
  1. Menu „Edit - Texts - Generate from Object Class“

  2. -> the Window „Create Text“ is shown

  3. select Object Class „* CT_FixedPoints“

  4. select Attribute „No“

  5. select Color „Red“

  6. select Size „4“

  7. select Layer „1“

  8. press „Create Texts“

  9. close the Window (OK)



Compute a Geodetic Transformation to import measured Data
  1. Open the File „CT_IdentPnts.txt“ (in the MensorGIS\bin\Debug\Data Directory) with any Text Editor

  2. -> you see 7 Identical Points, the Point Numbers are identical to the just visualized ones

  3. Menu „Surveying - Free Stationing / Measurement“

  4. -> the Window „Free Stationing / Measurement“ is shown

  5. choose the Coordinate Type „Polar“

  6. press „Pick Fix.Pnts.“ -> in the Graphics Plot Area select 52204 -> the GIS System Coordinates are shown

  7. for this Point copy the Horizontal Distance s and the Direction Angle/Bearing t from the Text File into the according TextBoxes

  8. press „Add Pnt.“ -> a line appears in the DataGridView below

  9. do the same for the next 3 Points

  10. when all 4 Points are in the DataGridView choose Transformation Type „Affine“

  11. press the Button „Calculate Parameters“ -> the Transformation Parameters are shown (Shift Vector, Rotation Angles and Scaling Factors)

  12. also the Residues are shown in the last two Columns of the DataGridView, they are given in [cm]/[cft] and shold be near Zero.

  13. if not so, check Numbers in the DataGridView. By Clicking two times (no Double Click) into a Field of the DataGridView you can edit it.

  14. press „From File ...“ -> select „CT_PolarMeas1.txt“ -> Polar Measurement of 284 Points including Number and Height get shown

  15. press the Button „Calculate New Points“ -> the GIS System Coordinates are shown in the last two Columns of the DataGridView

  16. choose the Object Class „*MapMeasurement“ in the left ComboBox below the DataGridView

  17. choose the Attribute „No“ in the upper right ComboBox and the Attribute „Height“ in the lower right ComboBox

  18. choose the Color „Black“ in the Toolbox of the MensorGIS Main Window

  19. press „Save“ -> the 284 Points including Number and Height get imported into the Project Data Set

  20. close the Window (OK)


CombinedTutorial_FreeStationing.jpg (89 kByte)

Remarks on Basic Survey Calculations:



Create a new Object Class for the Contour Lines (that you will generate later)
  1. Menu „Data - Schema - New Object Class“

  2. -> the Window „New Object Class“ is shown

  3. choose the Graphic Type „Line“ and type in the Object Class Name „ContourLines“

  4. then type in the first Attribute Name: 'No' and press the Button „Add Attribute“

  5. -> a line appears in the DataGridView below; press Button „Clear“ to reset the Input

  6. then type in the second Attribute Name: 'Height' and press the Button „Add Attribute“

  7. press the Button „Save“ to create the new Object Class and its Attributes

  8. -> a MessageBox says that the Object Class „ContourLines“ was saved

  9. close the MessageBox and then the Window (OK)


Generate Height Contour Lines from the Height Data
  1. In the Tool Bar of the MensorGIS Main Window choose „Black“ as active Color

  2. choose Menu „Height Data - Compute Contour Lines“

  3. -> the Window „Height Contour Lines“ is shown

  4. as Height Information select Object Class „MapMeasurement“

  5. and select Attribute „Height“

  6. as Destination select Object Class „ContourLines“

  7. and select Attribute „Height“

  8. select Interpolation Method „Inverse Distance (9)“

  9. choose in the ComboBox for the Intervall 2.5 Meters

  10. choose in the ComboBox for the Raster Resolution 5 Meters

  11. choose Mode „Preview“ to test if Intervall and Resolution are appropriate

  12. press Button „Calculate“ -> violet non-permanent drawing

  13. choose Mode „Store“ to save the Height Contour Lines

  14. press Button „Calculate“ -> Points and Lines get saved into the Project Dataset

  15. the Percent Number/Progress Bar show the State of computation (if you want to stop the computation then press „STOP“)

  16. when computation is finished the Height Contour Lines get displayed

  17. a Result Message says how many Contour Lines have been generated

  18. close the Window (OK)


Remarks on Interpolation Models:



Change the Cartographic Layout of the Fixed Points
  1. Menu „Cartography - Style Editor“

  2. -> Window „Style Editor“

  3. select Graphics Type „Point“

  4. choose a Graphics Style (Type and Size) from the next ComboBoxes

  5. choose a Graphics Color from the next ComboBox

  6. select Target of change „Object Class“

  7. select Object Class „CT_FixedPoints“

  8. select where Attribute „>WHOLE_CLASS<“

  9. press „Change“

  10. close the Window (OK)


CombinedTutorial_Result.jpg (94 kByte)

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MensorGIS Version 1.1.6, 2012/09/19