This Tutorial shows Basic Survey Calculations. You learn about
opening a Project Data Set (minfo)
creating Texts automatically
computing Sections and Traverses
developping a Marked-Out Route
In MensorGIS Text Features are a special Type of Point Feature (Menu „Edit-Texts-Generate from ObjectClass“):
they have a Position;
and a Text Content idependent of the Attributive Information;
they can be created from Point Features and a certain Attribute's Content.
A special Functionality of MensorGIS are Basic Surveying Calculations (Menu „Surveying“):
some types of Sections (Arc Section/Forwards Section/Backwards Section);
some types of Traverses (one-sided and two-sided Traverse);
a Marked-Out Route Development (Elements Straight and Arc of a Circle);
a Least Squares Network Adjustment (see AdjustmentTutorial.htm).
Mensor is the Latin word for Surveyor!
Menu „File - Open“
select „SurveyTutorial.minfo“
Menu „Edit - Texts - Generate from Object Class“ -> Window „Create Text“:
select Object Class „* TrigoPoint“
select Attribute „Name“
select Color „Black“
select Size „4“
select Layer „1“
press „Create Texts“
close the Window (OK)
Menu „Surveying - Arc Section“ -> Window „Arc Section“ is shown:
press P1 -> select TP3061 and then type in Distance 2451.62 [m]
press P2 -> select TP3065 and then type in Distance 2804.97 [m]
press „Calculate“ -> Section Point is at 32466572.253 / 5377033.157 (PP1)
press „Save“ -> Point Created
close the Window (OK)
Menu „Data - Attributes - change“
select New Point of Arc Section -> Window „Attributes: Change“:
enter Value „PP1“ for Attribute „Name“
press Button „Save“ to store
close the Window (OK)
Menu „Surveying - Backwards Section“ -> Window „Backwards Section“ is shown:
press P1 -> select St. Paul and then type in Angle 65.7789 [gon]
press PM -> select Trinity Church
press P2 -> select Radio Tower and then type in Angle 47.5701 [gon]
press „Calculate“ -> Section Point is at 32472101.788 / 5378309.988 (PPN)
press „Save“ -> Point Created
close the Window (OK)
Menu „Data - Attributes - change“
select New Point of Backwards Section -> Window „Attributes: Change“:
enter Value „PPN“ for Attribute „Name“
press Button „Save“ to store
close the Window (OK)
Menu „Edit - Texts - Generate from Object Class“ -> Window „Create Text“:
select Object Class „* TrigoPoint“
select Attribute „Name“
select Color „Black“
select Size „4“
select Layer „1“
press „Create Texts“
close the Window (OK)
Menu „Surveying - Traverse two-sided“ -> Window „Two-sided Traverse“ is shown:
press P0 -> select TP3065
press P1 -> select PP1 (Start of Traverse)
press PN -> select PPN (End of Traverse)
press PN+1 -> select Radio Tower
type in Distances and Angles (there are 3 Distances between the Points and 4 Angles in the Points):
type in 1475.357 [m] / 114.3653 [gon]
type in 2207.785 [m] / 192.7690 [gon]
type in 1998.432 [m] / 205.2299 [gon]
type in 9999 [m] / 248.5423 [gon]
press „Calculate“ -> 2 new Points (and the Traverse) get highlighted
press „Save“ -> Points Created
Remark: The Residues are about 1 Centimeter which is quite good.
close the Window (OK)
Menu „Data - Attributes - change“
select the left of the New Points of Traverse -> Window „Attributes: Change“:
enter Value „PP2“ for Attribute „Name“
press Button „Save“ to store
select the right of the New Points of Traverse -> Window „Attributes: Change“:
enter Value „PP3“ for Attribute „Name“
press Button „Save“ to store
close the Window (OK)
Menu „Edit - Texts - Generate from Object Class“ -> Window „Create Text“:
select Object Class „* TrigoPoint“
select Attribute „Name“
select Color „Black“
select Size „4“
select Layer „1“
press „Create Texts“
close the Window (OK)
Menu „Surveying - Marked-Out Route“ -> Window „Marked-Out Route“ is shown:
choose Element Type "Straight", type in 233.05 [m] as Length and press „Register“ -> DataView shows first Entry; press „Reset“
choose Element Type "Circle by Arc right", type in 1000 [m] as Radius and 576.36 [m] as Length and press „Register“ ; press „Reset“
choose Element Type "Straight", type in 851.89 [m] as Length and press „Register“ ; press „Reset“
choose Element Type "Circle by Arc left", type in 1000 [m] as Radius and 525.52 [m] as Length and press „Register“ ; press „Reset“
choose Element Type "Straight", type in 75.27 [m] as Length and press „Register“ ; press „Reset“
Now all five Elements are entered, so press „Calculate“ -> The Preview shows you a Sketch of the Marked-Out Route; The DataView gives the Lengths of the Elements and the whole Marked-Out Route (2262.090 [m]).
As this Development uses a local Coordinate System, now we want to tranform the Main Points of the Route's Axis into our current Project Dataset.
Under Point1 choose "0", press Button „Pick P1“ and in the MensorGIS Main Window click on Point PP2 -> "8" should appear in the Button
Under Point2 choose "5", press Button „Pick P2“ and in the MensorGIS Main Window click on Point PP3 -> "9" should appear in the Button
Now the Identical Points are matched, so press Button „Transform“ -> Message "Trafo successful!" should appear.
Remark: The Scaling Factor of m = 1.000016608 indicates that the Transformation nearly doesn't change the Route's Scale - as it should be.
Have a look at the MensorGIS Main Window: the Main Points of the Marked-Out Route have been saved into the current Project Dataset.
Tip: Press Button „Redraw“ to refresh the Sketch of the Marked-Out Route if necessary.
Remarks on Basic Survey Calculations:
In Surveying usually the (plane) Coordinate System differs from the mathematical one: X is Northing and Y is Easting;
Because MensorGIS was developed as a hybrid CAD and GIS Program, the internal Coordinate System is defined as in CAD Systems: x to the right, and y up.
Routines which belong to the Graphics Plot Functionality of MensorGIS use the mathematical CAD System (ModulePlotFunctions);
whereas Routines which belong to the Survey Functionality of MensorGIS use the Survey and GIS System (ModuleGeodFunctions);
when calling Routines of the other part, these different Definitions must be kept in mind.
The Windows of the Basic Survey Calculations allow an Interaction to the Objects in the Plot Area of MensorGIS:
using the Buttons beneath the Coordinate Fields you may pick a Point Object in the Plot Area to take its Coordinates into the Window;
the Save Button beneath the New Point's Coordinate Fields creates a new Point Object with these Coordinates in the Plot Area.
MensorGIS Version 1.1.6, 2012/09/19