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2. Load DEM to Survey Library

ET-AL Recommendation to IPC

Assuming you have an existing project from the Initial Project Setup, you start GCD and open that project (if the first survey at a site, create a new project). Then, follow this video tutorial to see how to load your DEM to the survey library.
  • Load concurrent DEMs to the GCD Survey Library.

    • DEM Survey Properties Dialog

    The DEM Survey Properties dialog has three primary functions:
    1. Load topographic surveys into your *.gcd Project
    2. Associate various surfaces and datasets with those surveys (e.g. inputs into an FIS)
    3. Produces various elevation uncertainty models (error surfaces) of your survey

    These three functions are organized onto three different tabs of the DEM Survey Properties dialog  (DEM Survey tab, Associated Surfaces tab, and the Error Calculations tab):




    Adding DEM to Survey Library & Associated Surfaces Tab

    The survey library is the main interface for a user to add data to a project in GCD. Users load DEM to the survey library and once loaded can access the associated surfaces and error calculations tabs through the survey library.

    Associated surfaces are rasters that represent additional information about your survey. They are used in the calculation of error rasters. Common associated surfaces are slope, surface roughness, or point density. Each associated surface is represented as a single raster dataset.

    Creating a project and loading a DEM are covered in the video below.

    GCD 6 - Create Project and Load DEM


    GCD Orthogonality/Concurrency Fix

    Note, if your rasters do not meet the GCD's dimensional divisibility and orthognality criteria, your raster will be corrected for divisibility and orthogonality while loading your DEM to a GCD project or through the Clean Raster Tool.





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