Mapmerge for OziExplorer
Submitted: Wednesday, Dec 23, 2009 at 14:57
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Mikee5 (Logan QLD)
Hi Guys,
I have scanned and stitched 15 of my paper NT 1:100,000 maps and now I am merging them into a mosaic using Map Merge for OziExplorer. So far so good. The question I have is this:
On the scale for the destination map how many metres per pixels is best, the default is 100. I tried 1 but the laptop looked like it would take a week to do the job so I changed it to 10, I thought this was too quick so I went to 5 which it is doing now - as I am not sure what I am really doing, is there an expert who could tell me if I am on the right track, please.
Reply By: The Explorer - Wednesday, Dec 23, 2009 at 16:11
Wednesday, Dec 23, 2009 at 16:11
Hello, there is no set value you should use. Obviously the less metres per pixel the better resolution you will have but at the cost of increase file size. However there is no point in making the m/pixel setting less than the original image. A bit of experimentaion maybe required to get the best comprimise between resoltuon and file size (though 15 maps isnt that many so cant see file size being too much of a problem sepending on original scan resolution).
Maybe not 100% relevant as I didnt use mapmerge but the 100K mozaics I have done are as follows
165 maps - resulting file is 10.6m/pixel - 1.1GB (ecw format)
126 maps - resulting file is 11.3m/pixel - 0.89GB (ecw format)
I have another ecw mozaic with about 100 maps (ecw format again) - it is 5m/pixel but only 156mb - mayeb ecw compression higher (?) The map is not as clear as the others I have despite less m/pixels??
Anyway - I would suggest you stay with the same similar m/pixel as the original. You are only doing 15 maps so cant see file size being a problem. Set it to go overnight if need be - a watched kettle never boils!!
Cheers
Greg
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Follow Up By: Mikee5 (Logan QLD) - Wednesday, Dec 23, 2009 at 16:21
Wednesday, Dec 23, 2009 at 16:21
Thanks Greg,
It is good to know I am on the right track. It is ticking away now @ 5m/pixel. I may re-do at better resolution if I am not happy with the result and, as you say, leave it overnight. These maps are old and have annotations on them so are
well worth preserving.
Mike.
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Follow Up By: Mikee5 (Logan QLD) - Thursday, Dec 24, 2009 at 09:29
Thursday, Dec 24, 2009 at 09:29
Thanks for the help. The computer took 6 hours to do the merge and it has worked, the result is pretty good. I might re-do it over the break with different settings to see the difference. For a first go just reading instructions and help files I sometimes surprise myself :)
Mike
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