To perform Geographic Measurements

The measurement options described here are calculations of area, perimeter, length, and distance between any two points.

The measurement operations can be performed by Indicationnt over existing geographic entities (points, lines, or polygons), or by Edition, where lines, points and polygons are not part of any IL defined in the project, they are simply drawn on the screen during the measurement operations.

  • load and present in the active screen a thematic or cadastral IL;
  • click on Tools - Measurements... in the main menu. The window "Measurements" will be displayed (next figure);

Following you will see how to perform both types of measurements.

·        Measurement by Editing

Other options for geographical analysis in Spring

 


Measurement by Indication

The operation of measuring entities by indication, over one existing infolayer, requires the existence of at least one IL of the models: thematic, numeric, cadastral, or network, and some digitized entity. Otherwise, the option of type indication will be disabled.

Polygon Area and Perimeter Measurement

To calculate the area and perimeter of any polygon (closed polygon) in thematic or cadastral maps, load an IL that has that type of entity.

  • click on Indication to define the type of measurement;

  • select Area/Perimeter in Option: ;
  • choose the Unit for the results (meters, kilometers, or hectare);
  • using only the left button of the mouse click once over the polygon in the active display, it will be selected with a different color (see the figure). Note that the values are presented in the lower bar of the Measurements window (see the figure above).

Repeat the procedure above to see the data about the other polygons.

OBS: The system searches for the polygon that is closest to the mouse position in the active display, in case it doesn't find one, the message "Polygon not found" will be presented, click on Continue to proceed.


Measuring Line length

To calculate the length of any line represented in thematic, cadastral, network, or even numeric (contour lines) maps, load an IL that has that type of entity.

  • click on Indication to define the Type of measurement;
  • select Length in Option: ;
  • choose a Unit for the results (meters, kilometers, or hectare);

Using only the left button of the mouse click once over the line in the active display, and it will be selected with a different color (see the figure below). Note that the values are presented in the lower bar of the window "Measurements" (see the figure below).


 

Repeat the procedure above to see the length of other lines.

OBS: The system searches for the line that is closest to the position of the mouse, in case it doesn't find one, the message "Line not found" will be presented. Click on Continue to proceed.


Measuring distance between points

To calculate the distance between any two points (the entity point, a point over a line, or even a point defined by the proximity of the mouse to a line) represented in thematic, cadastral or network maps, or even numeric (contour lines and spot heights), load an IL that contains these sort of entities.

  • click on Indication to define the Type of measurement;
  • select Euclidian Distance in Option: ;
  • choose the Unit for the results (meters, kilometers, inches or feet) using only the left button of the mouse click on two points of the loaded IL. The points can be isolated, be any point on a line, or even a point created on a line by the proximity of the mouse. A line segment shows up with a different color in the display presenting the measured distance (see the figure below). Note that after clicking on the second point the values are automatically presented in the lower part of the window "Measurements" (see the figure below).

 


 

Repeat with two other clicks to see the distance between two selected points.

OBS: The system searches for the line that is closest to the position of the mouse, in case it doesn't find one, the message "Line not found" will be presented. Click on Continue to proceed.

About geographic measurements





Measurement by Editing

The operation of measuring entities by edition does not require any type of Infolayer loaded or visible in the drawing area. In this case we can even use a background image, over which the measurements will be performed. The digitized entities are not saved in any infolayer, being visible only when the measurement window is open.

Measuring the Area and Perimeter of edited polygons

To calculate the area and perimeter of any edited polygon (closed polygon) it is not required the visualization of any IL on the screen. the polygons will be edited as closed lines (islands), that is, when finishing the edition the first and the last points will be connected automatically.

  • click on Editing to define the type of measurement;

 

 

  • select Area/Perimeter in Option: ;
  • choose the Unit for the results (meters, kilometers, or hectares);
  • using only the left button of the mouse click on every point to define the form of the polygon. To close it click with the middle button of the mouse (see the figure below). Before calculating the values you can make corrections on the edited polygon. Use the tools for Creating, Moving, and Deleting;

 

  • click on Calculate. Note that the values are presented in the lower bar of the window "Measurements" (see the figure below);
  • repeat the last two steps above to see the data of other polygons.

 


Measuring the Length of edited lines

To calculate the length of any edited line it is not required the visualization of any IL on the display. the lines will be edited as open lines (arcs).

  • click on Editing to define the type of measurement;
  • select Length in Option: ;
  • choose the Unit of the results (meters, kilometers, inches or feet);
  • using only the left button of the mouse click on every point to define the trajectory of the line. To finish with the line click with the middle button of the mouse (see the figure below). Before calculating the values you can make corrections over the edit line. Use the tools to Create, Move, and Delete.

 

  • click on Calculate. Note that the values are presented on the lower bar of the window "Measurements" (see figure below);

 

Repeat the last two steps to see the length of other lines.


Measuring the Distance between points

To calculate the distance between any two points on the drawing area it is not required the visualization of any IL on the screen.

  • click on Editing to define the type of measurement;
  • select Euclidian Distance in Option: ;
  • choose the Unit of the results (meters, kilometers, inches or feet);
  • using only the left button of the mouse click on any two points on the active drawing area. A line segment will show on the screen presenting the measured distance with a different color (see the figure below). Note that after clicking on the second point the values are automatically presented in the lower bar of the window "Measurements" (see the figure below).


 

 

NOTE: To perform the measurement for other points just click on any two other points in the active display. Every time you define the second point the value for the distance is automatically presented.

About Geographic Measurements


Other options for geographical analysis in Spring