Hello,
I would like to ask a question regarding calculation of UTM letter in
vikviewport.c/vik_viewport_screen_to_coord() function.
The following code is recognizing a possibility that input screen position
passed as function's argument may be located in neighbouring UTM zone,
therefore a zone_delta is calculated and the zone itself is adjusted
(together in easting in that zone).
However the code doesn't seem to consider a case where the input screen
position may be located in another latitude band. The band letter in
resulting utm variable is always set to be the same as band letter of
viewport's center coordinate. I think that the letter of resulting utm
should be calculated in some way.
utm->zone = vvp->center.utm_zone;
utm->letter = vvp->center.utm_letter;
utm->easting = ( ( x - ( vvp->width_2) ) * vvp->xmpp ) +
vvp->center.east_west;
zone_delta = floor( (utm->easting - EASTING_OFFSET ) /
vvp->utm_zone_width + 0.5 );
utm->zone += zone_delta;
utm->easting -= zone_delta * vvp->utm_zone_width;
utm->northing = ( ( ( vvp->height_2) - y ) * vvp->ympp ) +
vvp->center.north_south;
Please let me know your opinion.
Best regards,
Kamil
_______________________________________________
Viking-devel mailing list
Viking-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/viking-devel
Viking home page: http://viking.sf.net/
