ExtractIsoline
Instructions
Extract all contour lines from the surface model by specifying parameters. When users need to extract contour lines on a large scale or DEM data is very precise, traditional methods can no longer meet performance requirements, so it is necessary to use big data methods to efficiently extract contour lines. Generate the extracted raster dataset (RasterRDD).
Parameter Specification
| Parameter Name | Default Value | Parameter Definition | Parameter Type |
|---|---|---|---|
| RasterRDD to be analyzed | RasterRDD that needs to be reclassified | RasterRDD | |
| Reference value | 0.0 | The initial starting value when generating an contour line, calculated in the forward or backward directions at intervals of the contour distance, so it may not necessarily be the value of the minimum contour line. You can enter any number as the reference value. The Default Value is 0. For example, for DEM data with an elevation range of 220-1550, if the baseline value is set to 500 and the contour distance is 50, the result of extracting contour lines is: the minimum contour value is 250 and the maximum contour value is 1550 | Double |
| Isometric | 0.0 | The interval value between two contour lines, which, together with the reference value, determines which contour lines to extract | Double |
| Field name for saving elevation values (Optional) |
zValue | Field name for saving elevation values | String |
| Maximum value (Optional) |
0.0 | The maximum value of grid data. If set, it can avoid internal calculation of maximum and minimum values and improve running speed; If the minimum and maximum values of the grid are unknown, you can roughly set a range, or set it to 0.0. When both minValue and maxValue are set to 0.0, internal calculations will be automatically performed | Double |
| Minimum value (Optional) |
0.0 | The minimum value of grid data. If set, it can avoid internal calculation of maximum and minimum values and improve running speed; If the minimum and maximum values of the grid are unknown, you can roughly set a range, or set it to 0.0. When both minValue and maxValue are set to 0.0, internal calculations will be automatically performed | Double |