South North Modeled from Digital Elevation Data Pole
1
Views of the Globe Modeled from Digital Elevation Data A texture-mapped, orthographic-projection view was used for rendering the images. This (R4) version of the images now displays the full 2-minute horizontal and 16-bit resolution of the vertical data. The center viewpoints of the globes step 90° of longitude from 0° East around the world eastward to 90° West. Viewpoint latitudes step ±45° either side of the Equator, and directly over the Equator and each pole. As rendered for these images, each pixel covers at least a 3.44 minute square on the earth's surface. An arbitrary color palette was chosen to give a natural look to the continents and oceans, and the colors were assigned according to elevation. The resolution of the gridded data varies from 2 minutes (2 n. mi. or 3.66 km at the Equator) for the Atlantic, Pacific, and Indian Ocean floors and all land masses to 5 minutes for parts of the Arctic Ocean floor. Most ocean data points were taken from 2-minute gridded ocean depths derived from satellite altimery of the sea surface between 64° N and 72°S; Seafloor data northward from 64° North are from the International Bathymetric Chart of the Arctic Ocean (IBCAO) Version 1. Land data were primarily from 30-second gridded data collected from various sources by the (then) National Imagery and Mapping Agency. MGG-10R4 (2004) Published by the NOAA National Geophysical Data Center 325 Broadway Boulder, CO 80305 http://www.ngdc.noaa.gov/ D E P A R T M E N T O F C O M M E R C E U N I T E D S T A T E S O F A M E R I C A -5000 -11000 -4000 -3000 -2000 -1000 -10000 -9000 -8000 -7000 -6000 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 Elevation, Meters N A T I O N A L O C E A N I C A N D A T M O S P H E R I C A D M I N I S T R A T I O N U . S . D E P A R T M E N T O F C O M M E R C E ® 0°E 90°E 180°E 90°W 0°N 45°N 45°S North Pole South Pole
Transcript of South North Modeled from Digital Elevation Data Pole
Views of the GlobeModeled from Digital Elevation Data
A texture-mapped, orthographic-projection view was used for rendering the images. This (R4) version of the images now displays the full 2-minute horizontal and 16-bitresolution of the vertical data. The center viewpoints of the globes step 90° of longitude from 0° East around the world eastward to 90° West. Viewpoint latitudes step ±45° either side of the Equator, and directly over the Equator and each pole. As rendered for these images, each pixel covers at least a 3.44 minute square on the earth's surface. An arbitrary color palette was chosen to give a natural look to the continents and oceans, and the colors were assigned according to elevation. The resolution of the gridded data varies from 2 minutes (2 n. mi. or 3.66 km at the Equator) for the Atlantic, Pacific, and Indian Ocean floors and all land masses to 5 minutes for parts of the Arctic Ocean floor. Most ocean data points were taken from 2-minute gridded ocean depths derived from satellite altimery of the sea surface between 64° N and 72°S; Seafloor data northward from 64° North are from the International Bathymetric Chart of the Arctic Ocean (IBCAO) Version 1. Land data were primarily from 30-second gridded data collected from various sources by the (then) National Imagery and Mapping Agency.
MGG-10R4 (2004)Published by the
NOAA National Geophysical Data Center325 Broadway
Boulder, CO 80305http://www.ngdc.noaa.gov/
DEPA
RTMENT OF COMMERCE
UN
ITEDSTATES OF AMERIC
A
-5000
-11000
-4000-3000-2000-1000
-10000-9000-8000-7000-6000
0100020003000400050006000700080009000
Elev
atio
n, M
eter
s
NATI
ONA
LOC
EA
NIC AND ATMOSPHERIC ADMINISTRATION
U.S. DEPARTMENT OF COMMERCE
®
0°E 90°E 180°E 90°W
0°N
45°N
45°S
NorthPole
SouthPole
