Forum: General Topics

Hi TDHster,

I'm not quite sure why the maps aren't displaying correctly. It could be a memory issue - does it do the same thing when in 'Single' mode? How about with/without Map Caching turned on. And what size of map tile (pixel height/width) did you specify in the Map Organiser?

Regarding the calibration idea, to be honest I don't really see the benefit - if the map is not calibrated correctly to start with this can't be corrected later by adding an offset to the displayed position since the offset required would be different for each pixel of the map. For example, if a map was correctly calibrated on the left, right and bottom edges, but with an incorrect top edge value, then the offset required when the current location is near the bottom of the map would be minimal, but at the top of the map the offset required would be quite large. The only time the offset would be constant is if the top and bottom, or left and right edges are 'out' by the same amount. Hope this makes sense!!

Cheers,
Stephen

TDHster

Best way to test a map in TMJ is to use generate waypoints on the TMJ website and pull them down to phone.

Use road junctions or roundabouts to get some good references in the corners of your map.

Then on the phone highlight the waypoint and hit the "*" key, this will centre the map on the waypoint and allow you to see how accurate the phone map is. use this to look at all the waypoints that appear on your phone map.

This will allow you to decide if the map is generally offset, shrunk, stretched, slewed or all of the above. You can then either use some maths or trial and error and change the min and max calibration points and regererate the map.

I have had similar issues on large maps but have not experimented enough to suggest why but the above is a work around.

Regards

Pete

Yes, as Pete suggests the Waypoint idea could be quite useful. Even if you have no internet access on your phone you can still download the waypoints as an Ozi file to your computer (scroll to the bottom of the Waypoints page to find the Ozi link) and them import them to the phone.

I've been thinking about adding a (very) simple map offset function which would store the difference between the current location and the centre of the screen and apply this offset to the map in future (until the next restart). I'm still not sure that this would particularly help much though... any thoughts?

Overall, I think the problems you are having are more likely to be due to your map having a different projection from the rectangular WGS84 one used by TMJ-Mobile. OziExplorer is able to handle many different projections, but to add this functionality to the phone software would be hugely difficult. Converting between different projections can be very fiddly - as an example the formulae to convert between the British National Grid projection and WGS84 covers two page of A4:
http://www.ordnancesurvey.co.uk/gps/docs/
A_Guide_to_Coordinate_Systems_in_Great_Britain.pdf (Appendix C)!

What I'd like to do is create a computer-based program that stretches/distorts other projections ending up with a JPEG/PNG file for the phone which is perfectly 'square' and in the right WGS84 format. That way the phone doesn't have to perform all the complex calculations. I've actually already written a basic utility that does this for the British National Grid (Ordnance Survey maps now work really well on my phone), but it would need a lot more time/effort to add in more projection formats...

Does the autoloading do the same thing with and without Map Caching turned on?

I'm still considering the waypoint grouping, but not sure yet whether I'll add it or not. The next version does allow you to show/hide waypoints on the plan/map by type (Railway, School, Hotel, etc), which might help...

I'll add the scale dispay on the map page... When you talked about showing the map at different scales (1:2, 1:4, etc), isn't this is already available...?

Out of interest, how many waypoints are you using at the moment?

The map zoom is only available if you select more than one zoom level with the Map Organiser when you initially convert the map - the phone itself is unable to scale an image 'on the fly' so the different zoom levels have to be pre-generated by the Map Organiser (therefore it will only work with .TMJ files).

I'm working on an extra text page which shows stats for each section of the track (a new section is started automatically each time the program is started), so this should cover your other suggestion...

In the Map Organiser, just before you use the 'Save TMJ File As' function, select the zoom levels from the list (Original 1:1, Half Size 1:2, Quarter Size 1:4, etc) that you want to include in the TMJ file (Ctrl-click to select more than one). You can then use the */# keys to switch between levels on the phone.

(Check that you are using v1.2 of the Map Organiser as well.)

One tip with the waypoints, if you press the (3) key a second time the waypoints will be listed alphabetically, which can make it a bit easier to find the one you are after...

And will be very pretty if map,or may be and track view, be shifted in opposition moving direction on value proportional velocity. Certainly all this as feature than user can turn on or off.

Thanks to you! Already running ;)

About map shift.. For example: When I moving to east in map view cursor show me my position at center of screen. When I moving information from map behind my moving direction no such intresting such as part of picture im moving direction. And suggest - shift cursor that show my position from center to left on some value proportional velocity. In this case I will see more infromation on map in more interesting dircetion - towards I moving. And when I stop - return to center of mobile screen.
And may be follow dreams about it - not shift to center if moving direction not changes for some time f.e. if car temporary stopped in roadcrossing. And ability return map to center of screen by pressing some key will be convinient.