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how to split geotiff ?

bujelbujel Global Mapper UserPosts: 1 ✭✭
edited July 2009 in Technical Support
hi i'm rookie please help me
i have 1 gb geotiff image, i want to split at least 50 mb each, how?
and how to make gridline ?

thank's

Comments

  • STHSTH Global Mapper User Posts: 434Trusted User ✭✭
    edited July 2009
    Here is one suggestion:

    You have to "translate" MB into PIXEL-SIZE, this is how it is done with UNCOMPRESSED TIF.
    For instance an image which is 10 000 x 7 500 pixels and contains RGB = 10000*7500*3 = 225 000 000 = 225 MB

    I assume you want a square file:

    x^2*3 = 50 000 000 x = sqrt (50 000 000 / 3) = 4000 pixels in width and height

    1. Load your GeoTiff in GlobalMapper
    2. File - Export - Raster and Elevation - GeoTIFF
    3. In the Gridding tab - select: Specify Individual Grid Cell Pixel Size: Width: 4000 Height: 4000
    4. Ok.
    5. Select output directory
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