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Shaded Relief DEM Viewing - Geomatica 2018 SP1

PCI Geomatics -

A new Shaded Relief option has been added in Geomatica 2018 SP1 to allow for improved viewing of DEM layers.

Loading a Shaded Relief DEM

To add a DEM to the Maps tab using the Shaded Relief option, right click the layer you wish to load from the Files tab

The Shaded Relief will then load into the Maps tab.

Once the Shaded Relief layer is loaded there are a number of various viewing options available. The following are the display options:

- Grayscale Shaded Relief: Display the DEM using grayscale hill-shading.


- Fixed Color Shaded Relief: Display the DEM using color hill-shading. Colors are interpolated across elevation values to give a smooth gradation of the colors.


- Dynamic Color Shaded Relief: Display the DEM using color hill-shading. This option, the default setting, automatically re-renders the color display of the DEM as you pan or zoom across the viewer so that only the pixels being viewed currently are the basis of the colorization.


- Contoured Color Shaded Relief: Display the DEM using color hill-shading. Colors are not interpolated, which provides crisp definition of the various contour intervals. DEM pixels that are within one interval will use the same color in the map. If necessary, you can select additional options for Contoured Color Shaded Relief, such as adjusting the interval.

In this example, Contoured Color was selected and the Contour Interval (outlined below) was switched to 5.

Shaded Relief Options

You can select additional options for the display of shaded relief, such as selecting the location of the light source (shadow control). With each display type, the shadows are cast based on the light source and the elevation values.

Under Illumination, you can enter a value to determine the azimuth and altitude of the light source.

Azimuth
To adjust the azimuth, type or select the angle, in degrees, from north of the light source.You can enter any integer as the value.

Altitude
To adjust the altitude, type or select the the angle from the horizon, in degrees, of the light source. The value you enter must be an integer ranging from zero through 360.

Contoured Color Shaded Relief - These options are available when the Contoured Color display option is selected.

Contour starting elevation
To adjust the starting height of the contours, type or select the elevation you want.

Contour interval
To adjust the step size of the elevation between contours, type or select the number you want.

Pixels within one interval will use the same color in the map.

For example, with a starting elevation of 20 and an interval of 10, pixels ranging from 20 through 30 will be one color, and pixels ranging from 30 through 40 will be the next color, and so on. However, with a starting elevation of 7 and an interval of 10, pixels 7 through 17 will be one color, pixels 17 through 27 will be the next color, and so on.

Export Shaded Relief 

You can also export your Shaded Relief to a varitey of file types (PIX, TIF, JPG, JP2, BMP, IMG, PNG). 

 

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