Navigation QC Plugins


This set of INTViewer plugins is designed for the analysis and QC of marine navigation data. It consists of 3 different workflows.

Data Preparation Workflow

Because of the huge size of most marine surveys, we have designed a file format (xnav) that is efficient for handling big surveys. It is fast and allows the caching of receiver data to disk to make the analysis workflows memory efficient.

Some of the tasks performed by this workflow include:

  • Import of Navigation data from P1-90 or Segy files into xnav format.
  • Reprojection of P-190 files
  • Generation of edit files that can be used to specify receiver locations that should be removed from a survey.

Navigation QC Worklow

This workflow let you load a survey into a map view, displays sources and receivers. You can enter or calculate a grid and optimize it. The workflow let you generate maps, including Water bottom, fold and deviation maps. For each map you can specify the offset class and an azimuth range. Maps can be saved in various formats including P1, Handvel and ASCII formats.

  • Display of navigation data in a map view
    • XY or INLINE/XLINE display modes
    • Over 3000 projections supported for XY view
    • Display of sources and selected receivers.
    • Overlay of GIS data (shape files)
    • Labeling of sources
    • Display of binning grid
    • Panning, zooming and printing of maps (including CGM and PDF output)
navgis
  • Grids
    • Loading of grid from file or manually
    • Automatic calculation of grid
    • Optimization of grid (“best fit” based on optimization minimum distance of CMP from bin center for a specified set of offset classes)
rose
  • Tools
    • Survey Tooltip for sources and receivers
    • Calculation of distance and bearing
    • Generation of Rose diagram
    • Survey Statistics
    • Interactive specification of edit file (list of receivers to remove)
  
  • Maps
    • Water Bottom Map
    • Receiver Fold Map
    • CDP Fold Map
    • Deviation Map
    • Feather Map
    • Display of generated maps in map view
    • Saving of maps into P1, Handvel or ASCII formats.
feather

 

4D Binning Workflow

The Binning 4D Workflow provides tools to analyze two similar surveys collected at different times. It is ultimately used to find matching CMPs between data sets that have similar characteristics, so that corresponding traces can be directly compared. The "Base" survey is the first survey recorded, and the "Monitor" survey is recorded later. The final product of this workflow is a set of edit files that can be used to filter out non matching traces from the surveys.

  • Data Loading
    • Specify base and monitor survey
    • Import surveys from SPS, P1-90 or xnav formats.
  • Grids
    • Loading of grid from file or manually
    • Automatic calculation of grid
    • Optimization of grid (“best fit” based on optimization minimum distance of CMP from bin center for a specified set of offset classes)
    • Calculation of CMP data for histogram generation
  • Histograms
    • Histogram of distance between corresponding shots
    • Histogram of distance between corresponding receivers
    • Histogram of the sum of the distance between corresponding shots and receivers
    • Histogram of CMP distances (for base, monitor or both)
  • Maps
    • Map of the closest CMP’s of each bin for a given offset class range.
    • Other maps as in the Navigation QC workflow
  • Output
    • An edit file that contains a list of all the traces that don’t match the minimum CMP requirements.