Coordinates on Avanza maps

[johnrs]

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

[tastrax]

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

[johnrs]

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

[Mark F]

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.

[tastrax]

+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)

[tastrax]

Avenza Easting Northing

[taswegian]

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 ±

[tastrax]

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

[tastrax]

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.

[taswegian]

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.

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.

[tastrax]

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

[Warin]

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.

[tastrax]

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

[taswegian]

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.

[neilmny]

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

[tom_brennan]

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.