Night colors for raster charts

PolarView user recently noted that raster charts were not particularly easy to view in night palette. This was a long standing issue that eluded my attention. The reason is simple – NOAA raster charts include a few palettes including a bright day palette and a dark night palette. The included night palette is, indeed, not particularly visible.

Through the magic of Technicolor[tm] upcoming update of PolarView will deal with this issue by adjusting night time BSB chart palette for best visibility. The adjusted raster palette will also match PolarView night time vector chart colors more closely.

Here is a sample of what it will look like. On the left is an updated “colorized” chart in PolarView. On the right the same chart is displayed by another navigation software product in its original colors.

BSB Night View

Many BSB charts do not include a night time palette at all. PolarView now will attempt to use some sleigh of hand to create one. While this is by no means a universal approach, the new colorization method was tested on raster charts from a number of sources with fairly good results.

Here is a sample of a chart of New Zealand showing it in original and “generated” night colors:
BSB Generated Night View

The update will also, finally, support raster charts that cross the “dateline” (180th meridian).

4 Responses to Night colors for raster charts

  1. Helen Horrocks says:

    Aha! Was just trying to find support info on charts crossing the dateline… Sailing from NZ to Tonga is a little difficult at present πŸ˜‰ I’m assuming the update will make the map ‘flow’ in a continuous circle? Can you tell us how far off this update is yet? πŸ™‚

    • polarnavy says:

      “Continuous circle” in a quilting product would take a non-trivial effort. Granted – it’d be cool, but as I am sure you know, relatively few people cross “dateline” on a regular basis πŸ™‚

      Raster charts crossing dateline are visible on each side of dateline, as appropriate. For easier navigation, you can double-click just beyond the dateline and PolarView will move your chart view to the “other hemisphere”.

      All of this has been available in a release for a few months now.

  2. Helen Horrocks says:

    Oh, that’s disappointing. I thought that’s what you were referring to in the comment above. The double-click you mentioned doesn’t seem to work in the version I downloaded the other day. 😦

    And I think we may have differing opinions about relatively few people crossing the dateline! I live in NZ, and will be sailing to Tonga, along with hundreds of other cruisers who go every year, not to mention those who sail to and from all the other hundreds of Pacific Islands that are ‘beyond’ the dateline, plus all those who come from the US to Tonga, Fiji, etc. πŸ™‚

    It’s frustrating that half of the chart is ‘cut off’, and requires scrolling to the other side of the screen for viewing, route planing etc. I haven’t plugged a GPS in yet so not sure how it works with that.

    • polarnavy says:

      I think it’s worth considering that PolarView does a better job of handling “dateline” than most other navigation products.

      Majority of our customers (and world boaters) live in US and Europe, and of these vast majority a coastal cruisers. I would estimate that only a fraction of %1 of potential (and current) users are ever going to cross a dateline. Admittedly, It’d be great to make every user perfectly happy, but I already have a development TODO list for the next few decades πŸ™‚

      Double-clicking “beyond dateline” definitely works in current version. Just like you double-click on a chart to recenter on that chart location, double-click just beyond the chart (within a few hundred pixels of the “dateline”) to re-center on that location.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: