Please support ECW or GEOTIFF for offline maps

Started by locuspro, November 12, 2011, 07:22:55

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locuspro

OFFLINE MAPS
Support for SQLite, TAR maps, MBT maps, GEMF formats.

all these formats are incomptible with globalmapper, ttqv, compeland

So please support ECW or/and GEOTIF.
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elmuSSo

#1
I agree.

Tapatalk@CyanogenMod@HTCVision
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Menion

#2
this is task in progress ... currently I work on RMAP (viewtopic.php?f=13&t=1377) format, then will come some tunning for already added but not perfectly working TAR, then will comes other formats. I'm worried that GeoTIFF will not be possible, but we'll see ...
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joeloc

#3
normal geotiffs force you to load the complete file into memory, not very doable on mobile devices. however, you can tile them and add overviews as well, so they can be read partially. http://www.gdal.org/ has free tools for this:

gdal_translate -co tiled=yes -co compress=lzw huge.tif hugetiled.tif
gdaladdo hugetiled.tif 4 16 64

creates "hugetiled.tif" from "huge.tif" with 256x256 tiles and includes overviews at 1/4, 1/16, 1/64 size.

hugetiled.tif should work rather nicely on mobile stuff, it can be read and decoded partially just as other format map tiles. it could be a bit trickier to implement though because of
a) a shitload of different formats for projection & coordinates
b) the overviews can have arbitrary sizes, ie not a power of 2

btw, hugetiled.tif will also be A LOT faster on the PC at home when used with TTQV or GlobalMapper.
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