#Scatter plots Patch#

To change the patch size, right-click in the Image window or in the Scatter Plot and select Patch Size > size. The patch size for the Image window and Scatter Plot can be set independently.

The cursor size for viewing pixel distribution is set in the Patch Size parameter, which has a default setting of 10x10 pixels. You can interactively view the distribution of a pixel value under the cursor (called dancing pixels). Interactively View Pixel Distribution by Class To return the focus to the Scatter Plot window, click the Scatter Plot Tool button. You can click on other manipulators in the main toolbar to zoom, pan, fly, and so forth in the Image window.Click in the Image window and roll the mouse wheel up or down.

#Scatter plots full#

If the Scatter Plot is not in Full Band mode, you can zoom into both the Image window and Scatter Plot.

To reset the plot view, click the Reset Range button. Or, press and hold the middle mouse button (wheel) and use Ctrl+drag to draw a box around the area to zoom into.

To zoom in or out of the plot, click in the Scatter Plot and roll the mouse wheel up to zoom in, and down to zoom out.

A new Scatter Plot Tool dialog opens, and you can adjust the bands used for the plot as needed.

From the main menu bar, select Display > 2D Scatter Plot.

In the Layer Manager, select the raster to use for the plot.

You can have multiple Scatter Plots active simultaneously. The second raster must match the current spatial size of the Scatter Plot.

In the File Selection dialog that appears, select the new band and click OK.

To select a band from a different open raster, select File > Select New Band > X-Axis or Y-Axis from the Scatter Plot Tool menu bar.

To select different bands from the current raster, move the x and y slider bars in the Scatter Plot Tool to select a new band, or enter a band number in the field provided with the slider bar.

You can select different bands from the same image or bands from another image to create the Scatter Plot as follows: The Green band is the default y band in the plot, and the Red band is the default x band. This primarily occurs with very bright and dark pixels that occur at the extreme ends of the histogram, although some holes can occur with a few data values in the middle of the histogram. Small differences in data values between the reduced-resolution version of the data and the full-resolution data can result in missing pixels. A reduced-resolution version of the data (called a pyramid) is used to create the scatter plot when the Full Band option is enabled. For example, if you draw a ROI around the entire scatterplot and the Full Band option is enabled, you may see some missing pixels, or holes, in the resulting class displayed in the Image window. The Full Band option provides a qualitative representation of the data, and it has limitations that you should be aware of. To include the full range of data in the Scatter Plot, enable the Full Band check box in the Scatter Plot Tool dialog. This is useful with large files, as it provides quick interactive response time.

By default, the Scatter Plot is computed on the pixels visible in the Image window.

To change the name and color of the Scatter Plot classes, see Create and Manage Classes. The Scatter Plot Tool dialog appears, and a Scatter Plot layer is added to the Layer Manager.

Select Display > 2D Scatter Plot on the menu bar.

Click the Scatter Plot Tool button on the toolbar.

Display Pixel Distribution with Density Slice.

Interactively View Pixel Distribution by Class.

Tip: If a pyramid file does not exist and downsampling is not available for the input raster, the 2D Scatter Plot tool will not be available for use.Ĭlick on any of the following links for details: If the bands do not contain dependent data, either band can be plotted on either axis and the Scatter Plot illustrates only the degree of correlation between the two bands. One band provides the x coordinates and the other band provides the y coordinates. The Scatter Plot Tool allows you to interactively classify two bands of raster data.