[ gpsdrive ] NOAA charts

[Hamish]

> > [cropping off chart collars for auto-tile creation from BSB RNCs]

Chris:
> A basic test in an effort to keep things simple, I used qgis to play 
> around with a converted BSB to tif. Observations follow;
> 
> 1. grab suitable shape file of NA and overlay with tiff.
> 2. checked properties>colorbands 
> 3. made black and white pixels transparent
> 4. really screws up the chart..:) 
> 
> So what does this tell me? 
> 
> Well simply making specific bands/pixels transparent is not going to
> work. It  will be needed to physically remove the border,


the idea is that after removing black & white you zoom to what's left,
then reinstate/revert to the original image but with the updated zoom
settings.


Hamish