[mapserver-users] Color temperature control (night-time viewing of maps)

[Basques, Bob (CI-StPaul)]

Better to just point folks here I think:

http://stackoverflow.com/questions/6182451/how-to-calculate-the-sunrise-and-sunset-in-javascript

All sorts of links to different things related to sun and location.

Bobb



-----Original Message-----
From: Stephen Woodbridge [mailto:woodbri at swoodbridge.com] 
Sent: Monday, March 03, 2014 11:45 AM
To: Basques, Bob (CI-StPaul); mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] Color temperature control (night-time viewing of maps)

Bob,

Checkout this page:
http://williams.best.vwh.net/sunrise_sunset_algorithm.htm

-Steve

On 3/3/2014 11:55 AM, Basques, Bob (CI-StPaul) wrote:
> Hi Stephen,
>
> Yes, that looks like the correct route for this, time/location settings, at least to make something work globally.  The display is for a mapping interface that will most likely be location aware.  I've found a couple of references to some LIBs for finding terminator, and I think a temperature curve could be defined based on optimum settings from day/dusk/night views to make the map readable for all (natural) lighting conditions.  At least that's a place to start.
>
> Bobb
>
>
> -----Original Message-----
> From: mapserver-users-bounces at lists.osgeo.org 
> [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Stephen 
> Woodbridge
> Sent: Monday, March 03, 2014 10:46 AM
> To: mapserver-users at lists.osgeo.org
> Subject: Re: [mapserver-users] Color temperature control (night-time 
> viewing of maps)
>
> On 3/3/2014 11:30 AM, Basques, Bob (CI-StPaul) wrote:
>> All,
>>
>> So, I've been reading up on nighttime colors for electronic display(s).
>> I was wondering if anyone has any pointers on information about 
>> applying color temperature corrections to displays for nighttime 
>> viewing.  I'm in need of providing this functionality to some night crew workers.
>>
>> My first thought was to apply some sort of RGB algorithm to the 
>> mapfile color settings.  Then I thought maybe a middleware  processor 
>> routine (between MapServer and the browser) might be a better 
>> approach, or possibly using something in the browser . . .
>>
>> I'm only looking at setting up distinct color settings at the moment.
>> Maybe 3-5 ranges to start with.  I do know that some Mac hardware has 
>> some display monitoring for color temperature.  I would prefer to do 
>> something that could apply globally however.
>>
>> Maybe there are Browser functions that can be applied to the problem 
>> (I haven't found anything specific there yet though.
>
> Bob,
>
> One simple way to deal with this is to have two mapfiles with different colors setup on them and then you a substitution to switch between the day and night mapfile.
>
> I wrote some code years ago that detects the day-night night terminator line in javascript to you can make the change. you need to know the browser location to compute this accurately. but a simple [day/night] toggle button would allow the user to switch manually.
>
> -Steve W
>
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