Instructions for use
The Extract Specific Lines, i.e., the Extract Specific Isolines, can extract a certain number of isolines of specific values as desired by the user. You can directly input a specific value, or automatically generate a series of characteristic values according to the set range and interval. You can also import a specific value stored in a *.txt file.
- The Source Dataset used to extract the contours must be a DEM or Gird Dataset.
Application Example
Open the Terrain "Datasource under the Exercise Data/Raster Analysis folder, and there is DGM data with a resolution of 5 meters, which we will use as an example.
Function entrance
- On the Spatial Analysis tab-> Raster Analysis-> Surface Analysis-> Extract Specific Lines;
- Toolbox-> Raster Analysis Tools-> Surface Analysis-> Extract Isolines/Areas-> Extract Specific Lines. (iDesktopX)
Operating instructions
- Enter a specific value in the "Extract Specific Isolines" "dialog box, or click the" Batch Add "" button to pop up the "Batch Add" "dialog box, set the parameters such as the starting value, ending value, step length, segment number, etc. Of the isoline, and then click the" OK "button. Return to the Extract Specific Isolines "dialog box.
- Set public parameters for extracting contours, including resampling coefficients, Smoothness, Smoothness in Source Data, Target Dataset, and Parameter Settings. For the settings of public parameters such as source data, Target Dataset and Parameter Settings, please refer to Public Parameter Description .
- During Extract Specific Isolines, isoline information in txt format can be imported and exported, and one or all current isoline information can be deleted. The buttons in the toolbar correspond to the import, export, delete, and delete all operations from left to right.
- Click the "OK" button to complete the contour extraction operation.
Figure: Extract Specific Isolines.
Starting value: The initial starting value for generating the isoline.
End value: The maximum value of the generated contour.
Step: The value of the interval between two adjacent contours.
Number of segments: The total number of contours in the Target Dataset. After the step length is determined, the system will automatically calculate the equivalent value.
Here, the start value is set to 1100, the end value is set to 1200, and the step size is set to 20, which means that six contours with a distance of 20 between 1100 and 1200 are extracted.
