Example: Import an ESRI ADF File and Apply Style and Hillshading

In this example we import an ESRI ADF format file that provides a raster terrain elevation data set for the region near Yosemite National Park in the United States.   The data set imports as an image.  We then use Style to style the image and to provide hillshading.

 

See this example on YouTube at the Radian / Viewer - View an ESRI ADF File Showing Yosemite video.

 

dlg_import_adf.png

As discussed in the ESRI ADF topic we use File - Import to import the ADF by opening the hdr.adf file that is in the folder containing the ADF files for Yosemite.

 

eg_import_adf01_01.png

 

That creates a table in the project plus an image that shows the table.   When we double-click on the image to open it we see there is virtually no contrast to show the data in comprehensible form.  We can fix that by launching the Edit - Style dialog.

 

eg_import_adf01_02.png

 

In the Style dialog we check the Common color channel box, we press the Full Range button to load the full range of data into the Range boxes and then we press Tally, using the default number of 5 for the tally ranges.   We press the Altitude button to load that palette into the color wells.   We check the Shading box to apply hillshading and then press Apply.

 

eg_import_adf01_03.png

That produces a comprehensible display, but the hillshading is too dark and aggressive.

 

eg_import_adf01_04.png

 

Back in the Style dialog we change the Z scale from the default value of 1 to a value of 0.1 and then we press Apply.

 

eg_import_adf01_05.png

 

That's better.  

 

eg_import_adf01_06.png

We Alt-click on the image's tab to undock the image window and then resize it to make it larger, pressing the Zoom to Fit button to expand the view to fill the larger window.  That gives us a better view of the data.  

 

The famous Yosemite Valley known to millions of tourists is the seemingly narrow valley running horizontally across the image about one third of the way down from the top.  

 

See Also

ADF, ESRI ArcGrid

 

Style