Coordinates on Avanza maps

Bushwalking topics that are not location specific.
Forum rules
The place for bushwalking topics that are not location specific.

Coordinates on Avanza maps

Postby johnrs » Sun 31 Dec, 2017 5:32 pm

Hi Folks
I cant get the coordinates on my Avenza maps to tie up with eastings and northings from my NSW topos,
so far I have tried all the different coordinate options on the Avanza app.
Any comments much appreciated!
Thanks
John
johnrs
Phyllocladus aspleniifolius
Phyllocladus aspleniifolius
 
Posts: 614
Joined: Mon 09 Aug, 2010 6:09 pm
Region: New South Wales

Re: Coordinates on Avanza maps

Postby tastrax » Sun 31 Dec, 2017 7:42 pm

Which projections have you tried and what has been the results? How far out are they?

http://spatialservices.finance.nsw.gov. ... rojections

are you talking about these maps

http://maps.six.nsw.gov.au/etopo.html

or the ones by nswtopo the vendor at Avenza?

https://www.avenzamaps.com/maps/182693/ ... avon-river
Cheers - Phil

OSM Mapper
User avatar
tastrax
Lagarostrobos franklinii
Lagarostrobos franklinii
 
Posts: 2047
Joined: Fri 28 Mar, 2008 6:25 pm
Location: What3words - epic.constable.downplayed
ASSOCIATED ORGANISATIONS: RETIRED! - Parks and Wildlife Service
Region: Tasmania

Re: Coordinates on Avanza maps

Postby johnrs » Mon 01 Jan, 2018 7:56 am

Thanks Tastrax
We are using the maps from the Avenza vendor, not the ones directly bought from six maps.
The coordinate options on the Avenza app are :Lat Long -WGS 84,Easting and Northing & MGRS/USNG
The Eastings and Northings are pretty much unrecognisable, the right number of digits but unrelated to paper or those derived from the six map electronic tool.
????
Thanks
John
johnrs
Phyllocladus aspleniifolius
Phyllocladus aspleniifolius
 
Posts: 614
Joined: Mon 09 Aug, 2010 6:09 pm
Region: New South Wales

Re: Coordinates on Avanza maps

Postby Mark F » Mon 01 Jan, 2018 9:10 am

MGRS/USNG? US National Grid? I suspect this is your problem. Try using the Easting Northing setting instead. It has worked for me with NSW Topo created maps bought from Avenza.
"Perfection is attained not when there is nothing more to add, but when there is nothing more to remove".
User avatar
Mark F
Lagarostrobos franklinii
Lagarostrobos franklinii
 
Posts: 2332
Joined: Mon 19 Sep, 2011 8:14 pm
Region: Australian Capital Territory
Gender: Male

Re: Coordinates on Avanza maps

Postby tastrax » Mon 01 Jan, 2018 11:01 am

+1 for using Eastings/Northings


nswtopo usually has the coordinates at the edges so that makes it easy to verify (or they do on the ones I have from Tasmania)
Cheers - Phil

OSM Mapper
User avatar
tastrax
Lagarostrobos franklinii
Lagarostrobos franklinii
 
Posts: 2047
Joined: Fri 28 Mar, 2008 6:25 pm
Location: What3words - epic.constable.downplayed
ASSOCIATED ORGANISATIONS: RETIRED! - Parks and Wildlife Service
Region: Tasmania

Re: Coordinates on Avanza maps

Postby tastrax » Mon 01 Jan, 2018 11:09 am

IMG_0309.PNG
Avenza Easting Northing
Cheers - Phil

OSM Mapper
User avatar
tastrax
Lagarostrobos franklinii
Lagarostrobos franklinii
 
Posts: 2047
Joined: Fri 28 Mar, 2008 6:25 pm
Location: What3words - epic.constable.downplayed
ASSOCIATED ORGANISATIONS: RETIRED! - Parks and Wildlife Service
Region: Tasmania

Re: Coordinates on Avanza maps

Postby taswegian » Mon 01 Jan, 2018 12:41 pm

Somewhere you'd have an option to chose the projection. GDA94.
WGS should work okay as the difference is only a couple meters on ground.
Easting and northing is still pertinent to the grid projection.
Your weird coordinates sound like a projection issue.

just out of interest are your paper maps GDA94? Or older AGD66?
I assume you know the difference, but not sure.
The coordinates would still be recognisable, just 200 metres n'east different ±
User avatar
taswegian
Phyllocladus aspleniifolius
Phyllocladus aspleniifolius
 
Posts: 888
Joined: Tue 27 Jul, 2010 8:34 pm
Region: Tasmania
Gender: Male

Re: Coordinates on Avanza maps

Postby tastrax » Mon 01 Jan, 2018 1:20 pm

taswegian wrote:Somewhere you'd have an option to chose the projection.


Alas, I am not sure there is the ability to change projections in Avenza. You can however check the map projection.

http://help.avenzamaps.com/customer/en/ ... b_id=13810
Cheers - Phil

OSM Mapper
User avatar
tastrax
Lagarostrobos franklinii
Lagarostrobos franklinii
 
Posts: 2047
Joined: Fri 28 Mar, 2008 6:25 pm
Location: What3words - epic.constable.downplayed
ASSOCIATED ORGANISATIONS: RETIRED! - Parks and Wildlife Service
Region: Tasmania

Re: Coordinates on Avanza maps

Postby tastrax » Mon 01 Jan, 2018 1:24 pm

I would also check - is it just one map or many maps with the same issue. 'nswtopo' MAY even be on this forum under another name.
Cheers - Phil

OSM Mapper
User avatar
tastrax
Lagarostrobos franklinii
Lagarostrobos franklinii
 
Posts: 2047
Joined: Fri 28 Mar, 2008 6:25 pm
Location: What3words - epic.constable.downplayed
ASSOCIATED ORGANISATIONS: RETIRED! - Parks and Wildlife Service
Region: Tasmania

Re: Coordinates on Avanza maps

Postby taswegian » Mon 01 Jan, 2018 3:16 pm

Looking at the Avenza site I gather you have the option to change a few things including display format which yields I gather E,N or lat/long.
I've an android app that is set to UTM Nad83 which is pretty close for my work with such a device.
20180101_160419.png

Screenshot_20180101-160045.png

Not sure if that's any help at all.
(I have a base station there and Coords are 392.115E, 534.497N. My cursor was just n'east of actual mark so gives an appreciation of insignificant difference.
User avatar
taswegian
Phyllocladus aspleniifolius
Phyllocladus aspleniifolius
 
Posts: 888
Joined: Tue 27 Jul, 2010 8:34 pm
Region: Tasmania
Gender: Male

Re: Coordinates on Avanza maps

Postby tastrax » Mon 01 Jan, 2018 4:21 pm

It looks like you can only change the display format in Avenza NOT projection (which must be set in the map)

IMG_0311.PNG
Cheers - Phil

OSM Mapper
User avatar
tastrax
Lagarostrobos franklinii
Lagarostrobos franklinii
 
Posts: 2047
Joined: Fri 28 Mar, 2008 6:25 pm
Location: What3words - epic.constable.downplayed
ASSOCIATED ORGANISATIONS: RETIRED! - Parks and Wildlife Service
Region: Tasmania

Re: Coordinates on Avanza maps

Postby Warin » Mon 01 Jan, 2018 4:29 pm

Look at the

"Latitude, Longitude"

Followed by "WGS84" - I think that gives you the projection/datum.

--------------
Don't think much of a system that cannot change the information to match a paper map. You may want to get your location from Avanza and put that on your map .. and that could be some other projection/datum.
User avatar
Warin
Athrotaxis selaginoides
Athrotaxis selaginoides
 
Posts: 1408
Joined: Sat 11 Nov, 2017 8:02 am
Region: New South Wales

Re: Coordinates on Avanza maps

Postby tastrax » Mon 01 Jan, 2018 5:11 pm

Warin wrote:Don't think much of a system that cannot change the information to match a paper map.


I agree - not the best especially when the actual projection of the map is hidden away. I think the system does some auto reprojection to get everything into WGS84 as I just grabbed some maps from Paris and Denver (in other projections) and the display format options dont seem to change
Cheers - Phil

OSM Mapper
User avatar
tastrax
Lagarostrobos franklinii
Lagarostrobos franklinii
 
Posts: 2047
Joined: Fri 28 Mar, 2008 6:25 pm
Location: What3words - epic.constable.downplayed
ASSOCIATED ORGANISATIONS: RETIRED! - Parks and Wildlife Service
Region: Tasmania

Re: Coordinates on Avanza maps

Postby taswegian » Mon 01 Jan, 2018 7:44 pm

I used Avenza plug in for Illustrator and found they took things seriously.
I'd imagined they'd be interested if users had troubles.

They were very supportive with me, even implementing suggested enhancements quickly.
A good lot to deal with.
User avatar
taswegian
Phyllocladus aspleniifolius
Phyllocladus aspleniifolius
 
Posts: 888
Joined: Tue 27 Jul, 2010 8:34 pm
Region: Tasmania
Gender: Male

Re: Coordinates on Avanza maps

Postby neilmny » Tue 02 Jan, 2018 4:18 am

Would it be worth trying "custom EPSG code" and entering EPSG:28355 which is GDA/MGA Zone 55?
From QGIS - +proj=utm +zone=55 +south +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs
User avatar
neilmny
Lagarostrobos franklinii
Lagarostrobos franklinii
 
Posts: 2604
Joined: Fri 03 Aug, 2012 11:19 am
Region: Victoria
Gender: Male

Re: Coordinates on Avanza maps

Postby tom_brennan » Wed 03 Jan, 2018 9:33 am

If you’ve ever used the nswtopo software, its default projection is a “transverse mercator, with a central meridian corresponding to the map's centre”. To use with UTM, it would need to be reprojected based on the zone. I assume the vendor (nswtopo/Matthew Hollingworth) would do that before putting on Avenza, but maybe one slipped through?

FWIW the SIX Maps ones are now free.
Bushwalking NSW - http://bushwalkingnsw.com
User avatar
tom_brennan
Athrotaxis selaginoides
Athrotaxis selaginoides
 
Posts: 1350
Joined: Wed 29 Sep, 2010 9:21 am
Location: Sydney
Region: New South Wales
Gender: Male


Return to Bushwalking Discussion

Who is online

Users browsing this forum: No registered users and 17 guests