Moving and Clipping a Layer

An imagery or elevation layer is located on the terrain based on the geographic information it has, whether contained in the file, a reprojected value, or a manual input. You can modify the geographical location of a layer as well as clip a particular section of the layer, to display a subset of the image.

To change the geographical location of a layer:

§  After creating the imagery or elevation Layer, in the layer’s property sheet, in the “Imagery” or “Elevation” section respectively, update the Upper Left X, Upper Left Y, Lower Right X, and Lower Right Y values as required. SeeImagery and Elevation Layer Parameters” in this chapter for information.

To clip a layer:

§  If you want to draw a polygon around the required subsection of the raster, do the following:

a.     In the layer’s property sheet, in the Imagery section click Draw.

b.     In the 3D Window, place the polygon points by clicking in the desired location. You must place at least three points.

c.     Finish the polygon creation by right-clicking.

Note:        When creating a filled polygon, the lines of the polygon should not overlap each other. This may result in an irregular fill pattern.

§  If you want to load a shapefile which contains the clip polygon you want to use, do the following:

a.     In the layer’s property sheet, in the Imagery section click Load.

b.     Browse to the required shapefile, and click Open.  

Note:    If you want to undo the clip or draw polygon action and restore the original raster, click Restore.