Summary
A multiband raster is an image or data file with multiple bands representing different wavelengths in the electromagnetic spectrum, such as red, green, blue, and near-infrared. Each raster band contains actual cell values. Although the bands are displayed together, it is necessary to extract one or a few specific bands to focus on the specific information represented by the bands. This article describes the workflow to aggregate certain bands of a raster layer to form a new feature using several tools in ArcGIS Pro.
Procedure
- Open the ArcGIS Pro project.
- Extract the desired bands from the raster layer using the Extract Bands functions tool.
- On the Imagery tab, click Raster Functions, and search for Extract Bands in the Find Raster Functions search box.
- In the Extract Bands Properties pane, for Raster, select the raster layer from the drop-down list.
- For Method, click the drop-down list, and select the method for extracting bands. In this example, Band IDs is selected.
- For Band, click the drop-down list, and select the band to extract. In this example, band 1 is selected.
- For Combination, remove the values.
- Click Create new layer.
- Repeat Steps 2b through 2f with different bands that must be extracted from the raster layer.
- Convert the extracted raster layers to polygon layers using the Raster to Polygon tool.
- On the Analysis tab, in the Geoprocessing group, click Tools.
- In the Geoprocessing pane, search for and click Raster to Polygon (Conversion Tools).
- In the Raster to Polygon pane, for Input Raster, click the drop-down list and select the raster layer.
- For Field, click the drop-down list and select the field that aligns with the Input Raster layer.
- For Output polygon features, specify a name and location.
- Click Run.
- Repeat Steps 3c through 3e with all the raster layers created in Step 2.
- Use the Union tool to combine the polygon layers.
- In the Geoprocessing pane, search for and click Union (Analysis Tools).
- In the Union pane, for Input Features, click the drop-down list and select the polygon layers. In this example, 3 polygon layers created from 3 bands of the raster layer are selected.
- For Output Feature Class, specify a name and location.
- Uncheck the Gaps Allowed check box.
- Click Run.
- Aggregate the polygon layers created based on certain bands of the raster layer using the Dissolve tool.
- On the Analysis tab, in the Geoprocessing group, click Tools.
- In the Geoprocessing pane, search and select Dissolve (Data Management Tools).
- In the Dissolve pane, for Input Features, click the drop-down list and select the output layer created in Step 4.
- For Output Feature Class, specify a name and location.
- Uncheck the Create multipart features check box.
- Click Run.
The image below shows the aggregate polygon based on certain bands of the raster layer.