Anyone have similar links for sounds?
National Park Service sound maps: https://www.nps.gov/subjects/sound/soundmap.htm
National Transportation Noise Map: https://maps.dot.gov/BTS/NationalTransportationNoiseMap/
Light Pollution Map
161–170 of 200 posts
Re: Light Pollution Map
#162Is it a rendering artifact or something, that the left half of the United States is entirely darker than the right half? Like a line was drawn down the middle.
Nope, just that the western US is less densely populated than the eastern side of the country and that is directly reflected in the amount of light pollution.
In a straight line right down the middle? I wonder if its political, weather-related or what.
Re: Light Pollution Map
#163I need to download this overlay to import to osmand
Re: Light Pollution Map
#164Earlier quoted context omitted.
Probably the most noticable change in recent years is the replacement of mercury-vapor streetlights with the yellow-orange sodium-vapor lights, or with orangish LEDs (although some use blueish LEDs that are not that great for light pollution). In terms of actual legal requirements, Bavaria prohibits sky beams/searchlights directed upwards, and the illumination of facades of public buildings between 11pm and morning.
yellow-orange sodium-vapor lights are terrible for anyone who's not an astronomer. The sharp output spectrum prevents humans from seeing color
Do you really need color vision in the middle of the night?
Even with wide spectrum lights, turning them down is going to suppress colors anyway.
Re: Light Pollution Map
#165It would be really great if this and other kinds of geospatial data were more open and easily mashed-up. Let's say I wanted to find a nice tract of land to buy (Zillow), which has good hiking trails (AllTrails), low light pollution for stargazing (lightpollutonmap.info), and maybe a dirt airstrip (vfrmaps) to fly into. Currently, I have to have four browser windows open with each site. There's no way to mash this dat…
You can create OSM sqlite files and use them in OSM. It requires some knowledge of GIS but it can be done if you can get the raw data. I'd like to turn this light pollution into an OSM overlay, also vfrmaps seems pretty interesting too.
Re: Light Pollution Map
#166I question the accuracy of this when 19.41869, -92.06075 supposedly has enormous light pollution. What would be the cause of this?
Re: Light Pollution Map
#167I question the accuracy of this when 19.41869, -92.06075 supposedly has enormous light pollution. What would be the cause of this?
My guess would be oil wells or some other sort of industry in the sea.
Re: Light Pollution Map
#168This is a bit tangential, but should be a pretty good aurora over North America tomorrow (Sat Apr 24) night -- visible on the horizon as far south as Salem, OR to Annapolis, MD: https://www.gi.alaska.edu/monitors/aurora-forecast (forecast is for the UTC day, so the prior overnight for NA)
I live in Maryland. I can't determine from the link how to tell if its projected to be visible there.
Hit "Next" at the top and it will advance a day.
https://www.gi.alaska.edu/modules/custom/aurora-forecast/ima...
That's a direct link to the map as of this post. Unfortunately we have rain in the forecast here (I also live in MD).
Re: Light Pollution Map
#169I question the accuracy of this when 19.41869, -92.06075 supposedly has enormous light pollution. What would be the cause of this?
Same thing in the Arabian Sea. Judging by the Suez canal, these might be ships. Though I'm surprised that Ships emit as much light pollution as cities?
Re: Light Pollution Map
#170The oil wells in North Dakota are rivaling all the major US metros.