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  NOAA Electronic Charts in Raster Format To Improve

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Author Topic:   NOAA Electronic Charts in Raster Format To Improve
jimh posted 06-11-2014 07:19 PM ET (US)   Profile for jimh   Send Email to jimh  
Some time ago, NOAA announced that it was ending the printing of their paper charts, but perhaps lost in that announcement was the mention that the resolution of the electronic charts produced for the raster navigational chart (RNC) format would improve in resolution to 400-dots-per-inch (DPI) from the previous 254-DPI resolution.

This increase in resolution is anticipated to improve the clarity of the charts, along with improving their general aesthetics. NOAA indicated that the improvement should be applied to the entire catalog of electronic charts in RNC format by January 2014.

To see the difference, here is a sample chart in the old, 254-DPI resolution:

http://noaacoastsurvey.files.wordpress.com/2013/10/254_dpi_example2.jpg

And here is the same sample in the new 400-DPI resolution:

http://noaacoastsurvey.files.wordpress.com/2013/10/400_dpi_example2-2. jpg

For more see:
http://noaacoastsurvey.wordpress.com/2013/10/29/ better-nautical-chart-images-coming-to-electronic-charting-systems/

To browse the electronic chart catalog, visit:

http://www.charts.noaa.gov/InteractiveCatalog/nrnc.shtml

jimh posted 06-12-2014 11:24 PM ET (US)     Profile for jimh  Send Email to jimh     
I downloaded several hundred new NOAA RNC (raster) charts for the Great Lakes this morning for use with my computer-based chart plotter application, PolarView NS. The new 400-DPI charts look very nice.

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