![]() In total there are 9 official time zones according to the law. Note: The time zones in this country are often referred to by their generic names, without making a difference between standard time and Daylight Saving Time (DST). Places within this time zone are 5 hours behind Coordinated Universal Time (UTC). Most of the zone uses DST during summer and changes to Central Daylight Time (CDT), which is 5 hours behind UTC.Įastern Time Zone: The Eastern Time Zone (ET) encompasses almost all the 22 states in the eastern United States. It is observed by subtracting six hours from UTC (UTC-06:00). ![]() The five states that are included within the Mt are Colorado, New Mexico, Wyoming, Utah, and Montana.Ĭentral Time Zone: This time zone encompasses nine states in the US, the Canadian province of Manitoba, and most of Mexico. In the US, this time zone is generally known as Mountain Time (MT). Mountain Time Zone: This time zone observes standard time by subtracting 7 hours from UTC and 6 hours from DST. PST is one hour ahead of Hawaii and Alaska Time Zones, and at least one hour behind the other time zones. The standard time within this zone is observed by subtracting 8 hours from UTC (UTC-8). ![]() Pacific Time Zone: This time zone encompasses the western states of the US, western Mexico, and western Canada. The clock time in the Alaska Time Zone is based on the mean solar time at 135 degrees west of Greenwich Observatory. Some of the major metropolitan areas under this time zone include Honolulu, Hilo, and Kapaa.Īlaska Time Zone: This time zone encompasses almost the entire state of Alaska. These two areas do not use daylight saving time. Hawaii-Aleutian Time Zone:This time zone has derived its name from two areas, Hawaii and the Aleutian Islands in Alaska. In total there are six (6) time zones in the United States of America. The local time in a given time zone is defined by its offset from Coordinated Universal Time (UTC), which is the primary time standard used throughout the world. These are regions on the globe that observe the same standard time. All 3DEP products are public domain.Hint: Time zone may be simply defined as a range of longitudes where a common standard time is used. Other 3DEP products include five-meter DEMs in Alaska as well as various source datasets including the lidar point cloud and interferometric synthetic aperture radar (Ifsar) digital surface models and intensity images. These seamless DEMs were referred to as the National Elevation Dataset (NED) from about 2000 through 2015 at which time they became the seamless DEM layers under the 3DEP program and lost the NED branding. Other 3DEP products are nationally seamless DEMs in resolutions of 1/3, 1, and 2 arc seconds. The one-meter DEM is the highest resolution standard DEM offered in the 3DEP product suite. If a tile crosses two UTM zones, it is delivered in both zones. Each tile is distributed in the UTM Zone in which it lies. The time zones in North America are as follows: Eastern Time Zone. All bare earth elevation values are in meters and are referenced to the North American Vertical Datum of 1988 (NAVD88). This North America time zone map displays the eight time zones of Canada and the United States. The spatial reference used for tiles of the one-meter DEM within the conterminous United States (CONUS) is Universal Transverse Mercator (UTM) in units of meters, and in conformance with the North American Datum of 1983 (NAD83). One-meter DEM surfaces are seamless within collection projects, but, not necessarily seamless across projects. USGS standard one-meter DEMs are produced exclusively from high resolution light detection and ranging (lidar) source data of one-meter or higher resolution. The elevations in this DEM represent the topographic bare-earth surface. This is a tile of the standard one-meter resolution digital elevation model (DEM) produced through the 3D Elevation Program (3DEP).
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