The Boxes chart type allows you to visualize and compare the distribution and central tendency of the set of pixels collected through their quartiles.
Point collections have no mean value and use the point pixel value collected in each image band. Mean LineĪ mean line plot is a line connecting the mean values within a set of pixels, per band. Several plot types are available to visualize and analyze your spectral profile data.ĭata for each enabled area of interest, or the entire image, is processed and displayed in the spectral profile chart of choice. The spectral plot of a single band image displays useful information such as the minimum, maximum, median, and quartile values. You can create a spectral profile of a single band image, but the Mean Line option for Plot Type will be unavailable. The best plot type for a spectral profile defined with a point is the Mean Line option because a range of values is not available. You can also choose to display the spectral profile as another plot type. When the spectral profile is defined using a collection of pixels, the default visualization is a line chart. These selections determine what data is processed and displayed in your spectral profile chart and how the data is visualized. You can also delete the area of interest or move it to a different position in the list using the up and down arrows. You can choose a different color for any of the areas of interest by clicking the color box and selecting a color from the color picker.Ĭheck the Enabled check box to manage the area of interest, which enables the area of interest to beĭisplayed in the spectral profile chart and map view. Labels are stored as you type them, making them available in the pick list for reuse. To assign your own labels, select the label for an area of interest, type a new string, and press the Tab key to register the string. Define your spectral profileĮach area of interest you collect is listed in a table under Spectral Profiles and is given a default label such as Profile_1, Profile_2, and so on as they're collected. Use different colors for the various features you want to compare with your spectral profile. Use the color picker to choose a color when defining your area of interest. Use the drop-down arrow next to the segment icon to select the segmented image you want to use. If you have a segmented image layer in the Contents pane, you can select a segment as your area of interest. Additionally, you can define an area of interest by selecting a line, point, or polygon feature layer in the map view that overlay the image. The area of interest sketch tools include a point, line, circle, rectangle, polygon, and freeform shape. The pixel values of the image bands that intersect the area of interest will be plotted. You can use the Define an area of interest tools at the top of the Chart Properties pane to delineate an area or feature of interest in the map view. There are several options for defining the set of pixels you want to profile. Define an area of interest for your spectral profile To define the parameter settings for your chart, click the Data tab at the top of the Chart Properties pane. To create a chart, right-click the layer you want analyze in the Contents pane, point to Create Chart, and click Spectral Profile to open the Chart Properties pane. Spectral profile charts allow you to select areas of interest or ground features on the image and review the spectral information of all bands in a chart format.Ī spectral profile consists of geometry to define the pixel selection and an image with key metadata from which to sample. Natural and man-made materials often have unique spectral signatures that can be used to identify them quantitatively. Multispectral imagery is a powerful tool for distinguishing different types of materials and features in the landscape.
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