The Data-Based Vectorize Tool is accessable in the Raster Tools Panel in the Side Panel. It can be used to create vector polygon features for all areas within a selected polygon, box, or circle in the Shapes Layer, that have raster data values within a defined value range, based on the data values within the raster layer itself.
The Data-Based Vectorize Tool compares to the Grid-Based Vectorize Tool in that it can analyze larger areas, and is faster. The Grid-Based Vectorize Tool however, can have a much greater level of resolution in the vector features it produces, and is more accurate.
Before using the Data-Based Vectorize Tool, at least one raster layer needs to be loaded on the map and there must already be at least one polygon, box, or circle feature in the Shapes Layer to serve as the bounds for the vectorization process.
To use the Data-Based Vectorize Tool, follow these steps:
Select the one polygon, box, or circle feature to serve as the bounds for the vectorization process in the Shapes Layer. *Note that this feature must overlap with the raster layer to be vectorized.
Using the Target Raster Layer Selector, at the top of the Raster Tools Panel, select the raster layer to be vectorized.
Enter the low and high values for the value range in the appropriate boxes in the Data-Based Vectorize Tool: and
Click the Data-Based Vectorize button in the Data-Based Vectorize Tool:
All polygon features that are created are added to the Shapes Layer.