merge Geotiff's
Aerialmapper
Global Mapper User
I have 2 Geotiff images (with .tfw files) created from other software. 1.74 GB and 1.66 GB. with a seamless match line joining the two images. When I try to 'export' raster data I am informed of the Big Tiff option.
1) What is a big tiff as opposed to a regular tiff?
2) No .tfw file is created.
3) Size of new file is only 1.1 GB
I am new to GB and could find no information on help files or in forums.
Any help would be appreciated.
1) What is a big tiff as opposed to a regular tiff?
2) No .tfw file is created.
3) Size of new file is only 1.1 GB
I am new to GB and could find no information on help files or in forums.
Any help would be appreciated.
Comments
-
A BigTiff is an extension to the base TIFF format to support images that might be over 2GB in size (yours didn't end up that large after compression, but that's hard to know prior to export). Not all applications can handle BigTiff files, but most modern ones can.
When exporting from GM there is a checkbox to specify whether to create a World File (TFW) or not. Make sure that is checked.
What compression option did you use? You could easily get a smaller result for the same data at the same resolution if you used better compression (lossy like JPEG-in-TIFF) or loss-less like Deflate or LZW.
Thanks,
Mike
Global Mapper Guru
geohelp@bluemarblegeo.com
Blue Marble Geographics for Coordinate Conversion, Image Reprojection and Vector Translation
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