overlap GRID by number of pixels

robinrobin Global Mapper UserPosts: 50Trusted User
edited July 2012 in Elevation Data
Hi,

I had a DEM and boundary file. The boundaries were correct at the sub pixel level, but when I use the grid and overlap, there still remined a fractional pixel gap???

I have had issues with this in the past too.. perticularly at times the interpolation along the grid boundary not 100% correct.

Any ideas?

Robin

Comments

  • global_mapperglobal_mapper Administrator Posts: 17,238
    edited July 2012
    Robin,

    It sounds like you were gridding to the boundary area shapes, correct? Did you choose to grid just to the bounds of those areas or to the exact areas? If to the exact areas, the overlap wouldn't do anything. Also you might need to check the box in the Advanced section of the General tab of the Configuration dialog to keep a pixel if any part is in the crop area rather than if just the center point is, otherwise if the boundary area doesn't cross over the center point of the samples on any edge those samples wouldn't be included.

    Thanks,

    Mike
    Global Mapper Guru
    gmsupport@bluemarblegeo.com
    http://www.globalmapper.com
  • robinrobin Global Mapper User Posts: 50Trusted User
    edited July 2012
    The areas are irregular, so MBR would not work. I will try the "any part of pixel" thing.

    Thanks,

    Robin
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