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Purpose

 

It is intended to represent the fields of a shape (dbf) file, with different colors.

 

It is typically adopted for the Persistent Scatterers or the SBAS shape results.

 

Technical Note

 

The graphic representation can be created as follows:

1.Open a geocoded file in the ENVI view.

2.Open, from "File/Open Vector File" (ENVI main menu command bar)/ shape file; this must have been generated with the same areal extent and geographic projection of the geocoded image (point 1).

3.Launch the "Time Series Vector Analyzer" program, select the relevant .shp file and load it in the same display of the geocoded raster file.

4.By clicking the "Multicolor" button, in the "Vector Analyzer" interface, you are prompted to specify the attribute to display. It is possible to modify the display parameters such as the Min/Max displacement values for the color scaling.

5.Locate the mouse and click the left button; then push the "Plot Time Series" button ("Vector Analyzer" panel) in order to display the relevant graph.

 

Plot information dedicated to interpolation option

Once the Set Temporal Interpolation Code In Time Series is set to True in geocoding results (Other Parameters), the interpolation options can be displayed.

A pop-up is displayed which suggest to set the ENVI Preferences is displayed if the have never been set before. File/Preferences/Plots/Symbol has to be set. By default the interpolation symbol is displayed in red.

TS Vector Analyzer/Plot Time Series is now active using interpolation information.

By clicking Option/Show Interpolated Values, the interpolation properties are activated.

The red point shows the the temporal interpolated values. If all the points are displayed in red, all the corresponding dates have been spatially interpolated.

The intepolation method includes refinement and atmosphere estimate contributions. Please, make sure the reference point used in the refinement is not affected by noise, otherwise an unexpected behaviour is shown.

 

Please note: In case of large datasets, such as results of a PS processing, the results is split into several shape files. Right click on the correct shape file on the layer manager on the left side of ENVI and then select "active layer" before plot the data with the Time Series Analyzer".