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TopoDataProcessing.md

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The CHaMP Topo Toolbar is designed to guide the user through the production of a high-resolution digital elevation model (DEM) from topographic survey data collected using the CHaMP protocol. The general workflow involves importing survey data into ArcGIS, projecting/transforming the unprojected survey data (if the survey is the first for a site), editing the survey data, building and editng a Triangulated Irregular Network (TIN) from the survey data, building and editing a Digital Elevation Model (DEM) from the TIN, and generating a water depth map from the DEM.

The CHaMP Topo Toolbar provides custom tools for creating, inspecting, and editing the datasets required for producing high-resolution DEM’s from total station survey data. In addition, the Coordinate Transformation Tool can be found in the CHaMP toolbar.

Following is a list of the steps that are taken to process topographic survey data:

  1. scouting pre-survey
  • Export Control File
  • Scout Map

  1. Create Survey GDB

  2. process survey data

  • Update Z values for Breakline Vertices
  • Validate Description Codes
  • Process Instrument File
  • Survey Quality Report
  • Load Survey Data
  • Transformation Tool
  • Survey Extent Polygon
  1. generate topographic surfaces
  • Create Topo TIN
  • Convert TIN to DEM
  • Detrend
  • Review TIN Integrity
  1. generate channel features
  • Bankfull Extent
  • Wetted Extent
  • Digitize Channel Unit Polygons
  • Verify Channel Units and Clip
  • Stream Surface
  • Thalweg
  • Bankfull Centerline and Islands
  • Bankfull Cross Sections
  • Wetted Centerline and Islands
  • Wetted Cross Sections
  1. survey evaluation
  • 3D Point Quality Raster
  • Interpolation Error Raster
  • Point Density Raster
  • Roughness Height Raster
  • Slope Raster
  • Survey Error Raster
  1. finalize
  • Map Images
  • Note
  • Publish
  • Survey Review
  • Validate Data
  1. advanced tools
  • Add LiDAR to survey
  • Clean Transformation
  • Clear Workspace
  • Options
  • Prepare Survey For New Transformation
  • Substrate Raster Generation (batch process)
  1. technical reference
  • Font Size Issues in ArcMap
  • Methods
  • Topographic Point Quality
  • troubleshooting
  • ArcMap Screen Resolution

We have developed a system for troubleshooting problems with the GIS processing of the survey data. Please follow these steps if you encounter any problems in the GIS processing workflow:

  1. CHaMP topographic data processing toolbar http://champtools.northarrowresearch.com.

  2. CHaMP Topographic Processing Quick Guide (2013): This document contains the recommended workflow for CHaMP Topographic Processing. Also note additional guides for ArcGIS and Foresight, and tutorials.

  3. Help menus and videos: http://champtools.northarrowresearch.com.

  4. CHaMP GIS Processing Video Tutorials: A series of video tutorials is available for download: http://champtools.northarrowresearch.com/video-tutorials. Videos are always accessible via YouTube

  5. ArcGIS Help Resources for learning basic functions of ArcGIS: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html