Converting PDF Maps To Digital Maps

Ditch

Well-Known Member
Any PDF map can be downloaded, converted to an image & then calibrated in Oziexplorer for use as a digital map. Maps can be sourced from many locations including National Parks, State Forest, Tourism & many other places. Over the last month or so I have converted over 300 maps from the http://maps.six.nsw.gov.au/etopo.html site covering my local area in 1:25000 & some at 1:50000 scale.

41086223495_ac29b4c77d_o.jpg

One of the 1:25000 maps converted & calibrated at 150 DPI & 4.32 meters per pixel.​

First download the PDF maps that you need & save them to a folder on your computer. There are several ways to do the PDF to Image conversion. If you only want to convert a few maps then an online converter is all you need. This one at https://pdf2jpg.net/ is easy to use. Set the JPG Quality to 150 DPI, upload your PDF, hit convert & then download the converted image. Files can only be converted one at a time.

If you are doing a large number of maps a program like http://www.boxoft.com/pdf-to-jpg/ (free) can process a batch of PDF`s in either BMP,JPG,TIFF or PNG format. Set the conversion to 150 DPI resolution if using this program as well. 150 DPI will give a map resolution of 4.32 meters per pixel. Save the images to a folder on your computer.

Rename the files to remove unwanted information. I usually crop the images using a photo editor to save a bit of disc space but it is not necessary.

The images are now ready to be loaded & calibrated in Oziexplorer. The maps from http://maps.six.nsw.gov.au/etopo.html have the UTM co-ordinates around the edges so are easy to calibrate using the UTM method.

A great video showing this method
Other maps that may not have co-ordinates such as Tourism maps can be calibrated using the waypoint method. This can be time consuming & not as accurate as using the grid method. Once calibrated the maps can be used in other devices.

Some sources of PDF Maps for NSW. Other members might add some sources for their states.
Spatial Information Exchange - http://maps.six.nsw.gov.au/etopo.html
NSW State Forest Fossicking Maps - https://web.archive.org/web/2016030...ation.com.au/visit/activities/fossicking#maps
Cartoscope - https://www.cartoscope.com.au/scripts/hinterland.php
 

Ditch

Well-Known Member
A lot of those mapping PDFs are already georeferenced.
Thanks for that boobook, was wondering how apps like Avenza use PDF`s.
Problem is navigation devices such as Ozi, VMS & others need an image file. Would make life easier if you could extract the Georeference info from the PDF`s & use it when calibrating maps in Ozi but the converted PDF image is a different size so would not work.

Takes me around an hour to download, convert & calibrate 10 maps so it is a bit tedious & I am always trying to find a way to make the process easier & am open to any suggestions.
 

Ditch

Well-Known Member
So on that Six site you can select any georeferenced PDF equivalent to paper sheets in the catalogue and download it for nix. Up to 5 a day. Just run them in Avenza.
What i am doing is converting PDF maps to run in Oziexplorer & other devices that use map images such as OziAndroid, VMS, HEMA & others. Not all PDF maps are geo referenced so still need to be converted & calibrated to use.
 

Ziggy

Well-Known Member
What i am doing is converting PDF maps to run in Oziexplorer & other devices that use map images such as OziAndroid, VMS, HEMA & others. Not all PDF maps are geo referenced so still need to be converted & calibrated to use.
Yep.
But for NSW there's still a large collection that are. All those here?
http://spatialservices.finance.nsw.gov.au/__data/assets/pdf_file/0009/216954/SS_TopoMapCatalogue.pdf
The Vic source does geoTIFF from memory. Not compatible with those apps?
 

Ditch

Well-Known Member
The Vic source does geoTIFF from memory. Not compatible with those apps?
Tried the Vicmaps geotiffs in Ozi but wont work, need to have a .map file to go along with the TIFF. Having a play with Ozi Image Converter but having problems.
All the PDF`s on the http://maps.six.nsw.gov.au/etopo.html site are georeferenced. The problem is loosing the georeference info when converting the PDF to a format that Ozi & others can use.
 

Ditch

Well-Known Member
GeoTIFF in, OZI files out (maybe) ... http://moagu.com/?page_id=155 ..
Had a look at that this morning. Still need the file to be in GeoTiff format for it to work. Getting the PDF converted to GeoTiff is the problem. A script called GDAL - http://www.gdal.org/ can supposedly do the job but it is slower & more complicated process than doing it manually.

I just posted this up as a way to show an easy way of getting some free topo`s. If you have the patience to do it manually it doesn't take long to get enough maps done for a trip.
 

Ziggy

Well-Known Member
Yeah.
Hope it works out.
I use an old version of Avenza with the georeferenced files directly - to avoid the restriction on importing your own maps. Also I rarely need more than a few and don't mind paying for PDF Vicmap Topos.
Will see if G-Raster works to convert them for my Garmins. They're the best maps around IMO.
 

Ditch

Well-Known Member
Have finally found a program that will convert GeoPDF maps to various map formats including Ozi Map file, OZF, GeoTiff & many others. It can also download & calibrate Satellite imagery from Microsoft Maps as well as Open Street Maps. Converting maps from one format to another is also possible.

I have only tried the Trial version which places red crosses over the map but it works well & might be worthwhile paying the (Aus) $28.80 (at today`s exchange rate) for the full version if you are wanting to convert & calibrate a large number of maps.

It is called MAPC2MAPC - http://www.the-thorns.org.uk/mapping/
 
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