Lets load the country polygons shapefile we downloaded from Natural Earth. The input feature class and raster must have the same projected coordinate system. Use Ratio Policy only applies to numeric field types. We can use a polygon from a vector layer to crop the raster to the exact shape. The initial output raster format can be changed by selecting the desired output in the dialog. For example, if the input geometry was divided equally, each new feature's attribute value is assigned one-half of the value of the input feature's attribute value. To modify a raster clipping polygon with automatic updates In the Raster Control tool box, select the Modify Clip tool. The output value is based on the ratio in which the input feature geometry was divided. When Use Ratio Policy is enabled, whenever a feature in an overlay operation is split, the attributes of the resulting features are a ratio of the attribute value of the input feature. line, or polygon feature layer outside the spatial extent of an erase layer. However, if the input is a layer or layers created by the Make Feature Layer tool and a field's Use Ratio Policy is checked, then a ratio of the input attribute value is calculated for the output attribute value. erase parts of polygons with other polygons p <- shapefile(system.file('external/lux.shp', package 'raster')) b <- as(extent(6, 6.4, 49. Raster overlay combines multiple raster layers cell by cell through Boolean. In this example, the output feature class for the Intersect tool is named 'IntersectInputErase'. Rename the output feature class if necessary. For the Input Features field, add both the 'InputFeature' and 'EraseFeature' layers. A polygon erase feature can be used to erase polygons, lines, or points from the input features a line erase feature can be used to erase lines or points from the input features a point erase feature can be used to erase points from the input features.Īttribute values from the input feature classes will be copied to the output feature class. In Step 2 and Step 3, substitute the 'EraseFeature' layer with the output of the Clip tool. The Erase Features parameter value can be point, line, or polygon as long as the Input Features parameter value is of the same or lesser order feature type. Geometries that are coincident between the Input Features and Erase Feature parameter values will be removed.
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