Antarctica Map Discussion - WGS 84 / Antarctic Polar Stereographic EPSG:3031

Astro Zhang Yu shared this question 4 years ago
Answered

Hello

Planing to use Locus for my Antarctica expedition this season.

Does anyone know how can I make a Antarctica map (WGS 84 / Antarctic Polar Stereographic EPSG:3031) work with the APP?

I did tried Image Map Calibration, result attaching

Thanks!

Astrozy

Replies (2)

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Hi Astrozy

thank you for question and we're pleased that you want to use Locus in your expedition.

Unfortunately the internal map calibration is limited and can not prepare map form polar areas (due to map projection limitation). However Locus supports another map format (Trekbuddy) that can be in "arbitrary" projection and Locus should load it. There is also SW called Mapc2Mapc that is able to convert images or map into mentioned Trakbuddy format. I tried to convert the geotiff (in EPSG:3031) but there are some problems. For this reason I contacted the developer of this SW... I'll inform you if we find some solution for you.

Best regards

Petr

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Hi Petr

Thank you very much for the quick response, hope the issue can be fixed before our departure (end of Nov),

We will film a documentary for this expedition, at same time bring latest phones (running Android 8.0) from our sponsor (a tier one manufacture on the market) , help them film marketing materials, it will be perfect to have a usable map app on cellphone that can show where exactly we are in the programs ;)

Check one episode of our earlier program to Iceland here: http://v.youku.com/v_show/id_XMjc2OTU2MjMzMg

App usage example attaching

All the best

Astro

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Hi Astro,

I'd like to inform you that we find the way how to prepare map in EPSG:3031 for Locus.

The key part is the Mapc2Mapc SW http://www.the-thorns.org.uk/mapping/down.html The latest version can load map (geotiff) in EPSG 3031. Please install the app:

  • open raster file (using "Load calibrated map")
  • after that save map via Menu > Write Trekbuddy map > Simple set.
  • pack the result into *.tart format
  • copy created tar file into the device folder /Locus/maps
  • start Locus and select the map in Menu > Maps > Offline

Please see the attached example.

Best regards

Petr

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Hi Petr

Thank you for the effort.

The example working perfectly, but the map we‘re planing to use did cover the whole Antarctica continents (we are going to do a cross)

And Mapc2Mapc give an warning message about longitude and the APP won't be able to handle it well, info and example attaching

Any chance we can improve?

All the best

Astro

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Dear Astro,

Please consider if you really need map for whole continent.Maybe would be possible to split it into several parts. Or do you plan to trek to the pole? If not and you would create standard Locus sqlitedb map in EPSG:3857 that is useful to maximal latitude 85 degree.

However please contact John Thorn (the developer od mapc2mapc) with additional question.

Thank you

Best regards

Petr

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Thanks Petr

We are going to drive across Antarctica continent, from Ross Ice Shelf to Ronnie Ice Shelf, through south pole, although most of our trip will be in western hemisphere between W0~180, will see if I can cut the map in half to make it work... but it will not look good on camera when we want to show where we are, especially when we near the pole.

All the best

Astro

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Ohh I didn't expect it. That's really interesting. Please try to contact John from Mapc2mapc if there is any solution how to convert your map into mentioned TAR format. And please let me know about progress.

Thank you

Petr

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