HGT

HGT format is often used for Space Shuttle SRTM terrain elevation data.   The HGT dataport can consume accessory files that may accompany the .hgt, including .inc, .mag, .pol and .err files.  HGT usually provides coordinate system information, so terrain elevation raster images automatically will be correctly georegistered upon import.

 

The example uses 3 arc second resolution SRTM files in .hgt format.

 

dlg_import_hgt.png

 

To import from HGT format:

 

  1. Choose File-Import from the main menu.

  2. In the Import dialog browse to the folder containing data of interest.

  3. Double-click the file ending in .hgt for the data of interest.

  4. A table and an image will be created.

 

 

eg_import_hgt01_01.png

 

We can double-click on images that are created to view them.   For a more interesting display, we first create a new data source using a Bing street maps image server as shown in the Example: An Imageserver Tutorial topic.   We then create a map and drag and drop the Bing layer into the map, and then we drag and drop the image into the map.

 

eg_import_hgt01_02.png

 

The image appears using the correct projection, but it is in monochrome colors.   We must use the Style  panel to assign a palette to color the elevation values in the image.

 

eg_import_hgt01_03.png

 

We use the Style panel in the Contents pane to color the image using a palette.

 

eg_import_hgt01_04.png

 

That provides a more sensible display.  We see that this particular SRTM tile provides terrain elevation for Greece in the region between the island of Ithaca and the Gulf of Corinth.

See Also

Style

 

Maps

 

Images

 

DEM, GTOPO30

 

GRD, ESRI .ASC, .GRD

 

GRD, Surfer .GRD

 

Example: Spectacular Images and Data from Web Servers

 

Example: An Imageserver Tutorial