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What is Extract by mask in ArcGIS?
It is possible to select a specific area of a raster using another layer (raster or entity) as a template whose extension delimits the extent of the output raster. The output raster will maintain its attribute table, bounded to the extension that we have imposed.
What is a mask GIS?
Masking is a technique used to clarify dense or detailed map content by having the features of one layer hide, or mask, features of another layer where they overlap. A common use for masking is to mask features around annotation to ensure the text remains readable.
How do I mask in ArcMap?
To mask a layer, follow these steps:
- Choose one or more layers to be masked in the Contents pane.
- Under Feature Layer, on the Appearance tab, in the Drawing group, click Masking .
- In the drop-down menu, check one or more layers in the list. The layers with check marks will mask the selected layer.
What is the difference between a vector mask and a layer mask?
A layer mask also known as a pixel mask is a resolution dependent image created with the painting and selection tools, whilst a vector mask is a resolution independent object created with the pen or a shape tool that contains anchor points.
What is function of clipping mask?
A clipping mask is a group of layers to which a mask is applied. The bottommost layer, or base layer, defines the visible boundaries of the entire group. The shape in the bottom layer of the clipping mask determines what area of the photo layer above shows through.
What are the tools for extract by mask?
If the input mask is raster, the values for non-NoData input cell locations are copied to the output raster. Tools that can create the mask raster include Con, Test, and other tools in the extraction toolset.
What happens when mask is specified in extract by mask?
If Mask is specified in the environment setting while executing the Extract by Mask tool, the output raster would have cell values only for the area that lies within the intersection of the environment mask and the input mask data.
How to extract a mask from a raster?
Input mask data defining areas to extract. It can be a raster or feature dataset. When the input mask data is a raster, NoData cells on the mask will be assigned NoData values on the output raster.
How to extract cells from a mask in ArcGIS?
The output raster containing the cell values extracted from the input raster. This example extracts cells from a raster within a mask defined by an input polygon shapefile feature class. This example extracts cells from a raster within a mask defined by an input polygon shapefile feature class.