Brett Casebolt

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  • January 12, 2010 at 11:51 pm in reply to: GeoTIFF extents differ from world file extents #3920

    Brett Casebolt
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    Hello. I am the author of Natural Scene Designer Pro, which will georeference a raster image.

    When it saves a GeoTIFF it uses the same values in the GeoTIFF tags as it does in the TFW file. As a test, I georeferenced a world raster dataset and verified that the upper left corner in both the TFW file and the GeoTIFF tag is (-180, 90), not (-180.0083333, 90.0083333)

    One of the GeoTIFF tags (GTRasterTypeGeoKey) dictates whether the reference

    coordinate is the upper left (RasterPixelIsArea) or center (RasterPixelIsPoint) of the pixel.

    NSD Pro always sets the raster type as ‘RasterPixelIsArea’. This means that the upper left corner of the upper left pixel is (-180,90).

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