Table of Contents
Grid To Polygon
Documentation | Help File | Plugins | Grid To Polygon
Creates polygon shapes from connected regions of grid cells sharing the same value.
This value is determined taking into account the Tolerance parameter to avoid a problem with distinguishing floating-point cell values. For example, if Tolerance=0.1, then cell values of 0.123 and 0.111 are considered the same because they are both rounded to 0.1. A cell value of 0.211 is rounded to 0.2 and treated as in different region.
The vectorizing functionality was originally designed to use with classified grid layers, but the Tolerance property extends use of this function to all grid layers, e.g., digital elevation model (DEM) and other grids with continuous data.
Cell values extracted from a grid layer are used to create attribute information for the resultant vector layer.
Parameters
| Parameter | Description |
|---|---|
| Input grid layer | Grid layer to be converted to polygon. |
| Tolerance | A minimum distinguishing value of the grid cells. |
| Split Shapes | If True (default), single-part polygon shapes are created; otherwise multipart. |
| Ignore NoData | If true (default), cells of NoData is ommitted. |
| Save to disk | If checked, output will be saved to specified localization. Otherwise temporary layer will be generated. |
Example
