Instructions for use
The Extract all lines, namely the Extract All Isolines, is obtained by specifying all the qualified isolines in the Extract Surface model.
- 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 all lines;
- Toolbox-> Raster Analysis Tools-> Surface Analysis-> Extract Isolines/Areas-> Extract all lines. (iDesktopX)
Main parameters
- 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 .
- Base values and equidistance in Set Parameters.
- Click the "OK" button to complete the contour extraction operation.
Base value: The initial starting value when the contour is generated. It is calculated in the forward or forward and backward directions with the contour interval as the interval, so it is not necessarily the value of the minimum contour. You can enter any number as the base value. The default value is 0. For example, for DGM data with an elevation range of 220-1550, if the base value is set to 500 and the contour distance is set to 50, the result of extracting the contour is that the minimum contour value is 250 and the maximum contour value is 1550.
Contour distance: The value of the interval between two contours, which, together with the reference value, determines which contours are extracted.
After Parameter Settings is completed, Result Info will be automatically calculated and displayed. The description of Result Info is as follows:
Maximum grid value: The maximum grid value in the selected Source Dataset, which is system information and cannot be changed.
Minimum grid value: The minimum grid value in the selected Source Dataset, which is system information and cannot be changed.
Maximum contour: The maximum value of the contour in the Target Dataset.
Minimum Contour: The minimum value of the contour in the Target Dataset.
Number of isolines: The total number of isolines in the Target Dataset.
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| Figure: Extract All Isolines. |
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