Question

for a desired small region in your country,extract DEM file from USGS site and import it...

for a desired small region in your country,extract DEM file from USGS site and import it in ArcGIS

Homework Answers

Answer #1

The following instructions will only work if you DEM is in USGS format. Most DEMs from the USGS are not in USGS format (go figure…) – it is in SDTS format (but the USGS is also now producing DEMs in other formats including ArcGrid). If your DEM is in SDTS format (Spatial Data Transfer Standard), you will need to use the Import SDTS Raster to Grid tool in ArcToolbox.

After you download the DEM, you need to unzip it. Once it is unzipped, you can import it into ArcGIS.

  • Start ArcToolbox, and choose Conversion Tools – Import to Raster – DEM to Grid. Read the Help information before you begin, then follow the instructions
  • The USGS DEM is the file that ends in .dem (e.g., 3097420g.dem)
  • Leave all the defaults as they are for now – we will talk about these in class.
  • For output grid, you can navigate to your personal folder and type in a new name – this will be the final ESRI formatted DEM that you will work with, so give it a good name, like the name of the quad map it represents (e.g., austin_west). But read this carefully – you cannot specify a folder that has spaces in the folder name; in fact, no folder in the entire path on the computer can have spaces in it (don’t ask me why). So the folder path to this new grid needs to be something like C:tempedwards_groupdemaustin_west
  • Once the importing process is done, take a look at the results in file manager or explorer – notice that there are now two folders, one called the name that you gave the grid (e.g., austin_west) and one called info. This is an ArcInfo formatted GIS data set.
  • Next add the new grid to a data frame in ArcMap.
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