Defining the search criteria for chips in a database

In some cases you might want to narrow the search for chips to a manageable number of possibilities. By defining the search parameters, such as the sensor, a range of acquisition dates, or a region of interest, you can limit the chips that you want to use in the matching process. The Search Chip Database window is opened by clicking Search Criteria from the OrthoEngine ChipDatabase window during GCP Collection.

  1. Under Search Criteria and/or Region of Interest (ROI), type the parameters that you want to use to limit the number of chips available.
  2. Click Do Search.
  3. If your search was not satisfactory, click Restore Defaults to reset the window and enter a new set of parameters.
  4. For projects using satellite imagery: You can click Default ROI to Image to use the orbital data from a raw image database to estimate the parameters under Region of Interest (ROI) within a 50% margin of error. If you have collected more than three GCPs, OrthoEngine can compute an affine model to help estimate the ROI parameters within a 25% margin of error.
  5. When you are satisfied with your chip selection, click Close.
Parent topic: Understanding chip databases
Previous topic: Changing the color of the GCP or cursor in the chip

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