digital mapping
Submitted: Friday, Jul 23, 2004 at 11:19
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Space Bastard
I know that there is already a lot on here about this sort of thing, but I have a specific question that as yet is not answered.
Does anybody know of a convenient way of scanning a topographic map? I have all the topos from the Central Mapping Authority of NSW on paper, but I really would like to scan them onto my PC for use with OziExplorer. So far, I'm using freely downloadable satellite photos, but they really aren't that useful when trying to find that elusive
lookout.
Otherwise is it possible to buy them on CD for about the same price as they are on paper?
Cheers, James
Reply By: Vince NSW - Friday, Jul 23, 2004 at 11:50
Friday, Jul 23, 2004 at 11:50
To get all the sheets of NSw will cost about $1,100. You can get the whole of Aust in 1:250,000 for about $90.
To scan each 1:25,000 topo mat will need 6 scans and about 1.5 hrs. I have just scaned in the 9 1:25,000 sheets of our local area for my Bush Fire Brigade, it took the whole of a wet weekend. What area of NSW are you looking for ?
If you want to scan your own, go onto the OziExplorer web site and look up the instructions for scaning.
Hope this has helped
Vince
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Reply By: CruiserHead - Friday, Jul 23, 2004 at 11:59
Friday, Jul 23, 2004 at 11:59
Here in South Australia you can purchase such data from the state government (if available). If you scan paper, you need to autorectify the image later on, which is A LOT of hassle. Better to get it digitally from the source in the first place.
Best way to go is using low-level air photos from a recent flight. Again, ask your state government.
Also, the new Landsat7 data is pretty detailed, it depends what level of detail you need.
Cheers,
CruiserHead
AnswerID:
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Follow Up By: Greg Harewood - Friday, Jul 23, 2004 at 18:06
Friday, Jul 23, 2004 at 18:06
Cruisehead - a properly scanned paper map (ie no distortions that have resulted from the scan not working properly) does not need to be orthorectified (not spelt autorectified) for use with OziExplorer - I should now - I have personally done over 300 (using full map size drum scanner). You can actually calibrate an upside down map in OziExplorer and it will work (so Im told). Some other programs are not so smart and scanned maps must be orthor or geo rectified to work properly (ie show coordinates correctly over entire map area).
Cheers Greg
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Reply By: Space Bastard - Friday, Jul 23, 2004 at 12:28
Friday, Jul 23, 2004 at 12:28
Thanks for the quick replies,
I'm looking for the central coast around Cessnock area, and also south coast between Nowra and
Batemans Bay, including the Yadboro Forest.
Since I already own the 1:25 000 maps on paper I don't really want to
fork out another $100 on 1:250 000 maps for all of Aus. I might give it a go on the scanner and see how long it takes for me to either go insane or give up, but thankfully its not too many maps to scan.
AnswerID:
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Follow Up By: flappan - Friday, Jul 23, 2004 at 12:39
Friday, Jul 23, 2004 at 12:39
Its not the scanning thats the problem. Its stitching them back together and recalibrating them.
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Follow Up By: Member - Rohan K - Friday, Jul 23, 2004 at 12:48
Friday, Jul 23, 2004 at 12:48
Correct, and it's a real (Space) Bastard of a job.
You can purchase individual maps on cd (min of 10 maps) from LPI for about the same cost as the paper ones. They get cheaper as you purchase more. These will come already configured to work with Ozi. They will also be the most up-to-date version (same as the paper maps), unlike the cd set currently available which are all the old version maps (some dating back to the 1960s).
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Follow Up By: Mad Dog (Victoria) - Friday, Jul 23, 2004 at 13:47
Friday, Jul 23, 2004 at 13:47
As a matter of interest guys there is a new utility available from the oziexplorer called map merge. It only works with the latest development version of oziexplorer.
create a new map from a collection of maps by merging them together into a mosaic.
select the projection and scale (meters per pixel) of the destination map
select maps to use to create the map
select a region to use to create the map
It requires a lot of memory and computing power so it's only suitable for top end systems.
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Follow Up By: Baz (NSW) - Friday, Jul 23, 2004 at 17:19
Friday, Jul 23, 2004 at 17:19
This has nothing to do with your question but i just love your handle how did you choose it.
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