Remove anomalies from elevation data

Disponible con licencia de Image Analyst.

If your elevation raster has spikes, holes, outlier values, or noise, you can edit these pixels using Pixel Editor.

This workflow will follow these four steps:

1. Start a Pixel Editor session.
2. Select the region to clean up.
3. Remove noise from your elevation.
4. Save your edits.

Start a Pixel Editor session

El Editor de píxeles solo puede editar una capa cada vez por cada vista de mapa. La capa contextual empleada para iniciar la sesión del Editor de píxeles es la única capa que se puede editar en esa vista de mapa. Para editar otra capa del mapa, primero debe cerrar el Editor de píxeles, seleccionar la otra capa en el panel Contenido y volver a abrir el Editor de píxeles para operar en esa capa.

1. In the Contents pane, highlight the elevation raster dataset layer that you want to edit.

   El Editor de píxeles solo es capaz de editar fuentes de dataset ráster.

2. Haga clic en la pestaña Imágenes.
3. Haga clic en el botón Editor de píxeles .

You are now able to edit your elevation raster dataset using Pixel Editor.

Select the region

Edits using Pixel Editor are performed on the region you specify. The Region drop-down menu allows you to choose which tool you want to use to specify your region. The Region Mode allows you to create a new region, or modify an existing region. In this workflow, we will specify an area to edit, and then perform an operation to clean up the data.

1. Zoom in to the area where you want to remove pixel anomalies from your data.
2. In the Pixel Editor tab, click the drop-down arrow below Region Mode, and choose New .
3. Click the drop-down arrow below Region, and choose Polygon . Notice that there are some pixels in the data that look significantly different than most of the surrounding pixels.
4. Draw a polygon around the area of interest; double-click to end the polygon.

   

Edit the elevation data

There are several ways we can correct or edit elevation data. In this workflow, we will remove the anomalies or noise from the data. An outlier is defined as pixels that are different than surrounding pixels by a statistical threshold.

1. Click the Operations drop-down menu, and choose Outlier Filter from the gallery.

   The Pixel Editor Operations pane will appear.

2. Make sure that the region you created is selected. If not, click the Select tool from the Region group, and select the region.
3. In the Pixel Editor Operations pane, change the Threshold to 3 standard deviations. A higher value will choose pixels to filter that are further from the average pixel value within the filter window. The Filter Size specifies the size of the window for filtering the outlier pixels.
4. Click Apply.

   The outliers are assigned a new value determined by the pixel values contained in the specified filter window.

   

Guardar los cambios

Para confirmar las ediciones y devolverlas a la fuente de datos, debe guardarlas.

1. En el grupo Guardar, haga clic en el botón Guardar .

   Para guardar sus ediciones sin afectar a los datos de origen, guárdelas en un nuevo archivo. En el grupo Guardar, haga clic en el botón Guardar como y especifique una ubicación y un nombre de archivo para el nuevo archivo.

2. Cuando termine de editar el dataset ráster, haga clic en Cerrar Editor de píxeles en el grupo Cerrar.