TruEarth® 1km GLOBAL COLLECTION.
The TruEarth® 1km product was the first
cloud-free global Earth image based on actual landcover coloring. TruEarth®
1km imagery was unsurpassed
in color, luminance, and ground feature accuracy... a remarkable and
stunning visual portrayal of our planet.
The complete TruEarth® 1km imagery collection
is perfect for those "crash-zoom" animations
from outer space, smoothly taking you from space right into the TruEarth®
At its full
size, the TruEarth® 1km image is 43,200 pixels wide by 21,600 lines high
with a nominal ground resolution of 1 kilometer x 1 kilometer per pixel
(about 0.6 mile x 0.6 mile/pixel). TruEarth® 1km imagery is separated into two discrete categories: color base imagery and
collateral grayscale imagery. The color base images are full-color 24-bit
RGB images, while the collateral grayscale images are 8-bit grayscale
images. All TruEarth® images are delivered in the industry-standard
georeferenced GeoTIFF image file format, providing compatibility across
virtually all platforms and
TruEarth® 1km color base imagery comes in three primary forms, each of which has the
identical land imagery combined with one of three ocean portrayals.
natural ocean color TruEarth® 1km image shows the ocean as it appears to the
eye. Natural coloring derived from phytoplankton concentrations and other
ocean-specific datasets ranges from the natural ocean blues through the
greener phytoplankton-rich regions. The TruEarth® 1km natural ocean image is
the best choice for most productions involving the Earth as seen by a
human observer. TruEarth® 1km color base imagery includes terrain sun
shading from an Easterly-direction which naturally highlights landform
features, providing a deep richness to the imagery.
developed a second TruEarth® 1km natural ocean color balance that
specifically matches higher-resolution imagery such as Landsat7 datasets.
Referred to as the "TruEarth® 1km natural-color local balance"
version, the imagery incorporates a local brightness balancing technique
that brings out additional detail in otherwise darker areas of the
imagery. The local balance version of the natural color imagery is
sometimes preferred to the original natural color image for certain
clear ocean color TruEarth® 1km image shows the ocean floor relief as though the
ocean itself were transparent. This unique view of the Earth shows off the
drama of the ocean floor with imagery derived from actual bathymetric
measurement data. The TruEarth® 1km clear ocean image is best for productions
relating to Earth physical sciences where visualization of the ocean floor
can be just as important as the landforms.
no-ocean color TruEarth® 1km image shows only the landforms of the Earth; the
ocean areas are black. Combined with the collateral grayscale mattes (see
below), the color no-ocean image can be composited with any external ocean
imagery or textures desired by the user. The TruEarth® 1km no-ocean image does
not show north or south polar ice forms, like the natural and clear ocean
image types, only actual land masses.
Thirteen grayscale images make up the set of TruEarth® 1km grayscale collateral
images. These images round out the color base imagery by providing
additional resources to the user. The thirteen images include two shaded
relief maps, a night lights map, an elevation/displacement/bump map, five
geo-political boundary maps, and
shaded relief images come in two forms: one that is pure shaded relief
terrain and the other that has ocean, lake, and waterways portrayed in
black. These images can be used as simple texture maps showing the Earth's
terrain without any color attributes.
bathymetry shaded relief image provides shaded relief of the global sea
floor. The bathymetry shaded relief is available down to the 4km-per-pixel
resolution due to source data availability. Like the land shaded relief
images, this images can be used as simple texture map showing the Earth's
sea floor without any color attributes.
truly cool image, the TruEarth® 1km night lights image shows the lights of the
world as they appear at night. This grayscale image can be color-tinted
and mixed with any of the TruEarth® 1km color base images to create compelling
nighttime shots. Also, the night lights image is indicative of the Earth's
population centers and can be used for visualizing populated locations of
Map (8-bit grayscale and 16-bit DEM versions)
TruEarth® 1km elevation image represents terrain elevation with black equal to
the lowest elevation and white equal to the highest elevation. This 8-bit
can be used as a displacement map to displace a planar or spherical grid
of vertices to conform to the true ground terrain, thus creating a 3D
terrain model. One of the TruEarth® color base images can then be used as a
texture map applied to the terrain model. Similarly, the elevation image
can be used as a bump map to create terrain-based shading on the no-relief
versions of the color base images (see above).
TruEarth® 1km elevation image is also available in a 16-bit per pixel
format. The 16-bit elevation image provides full elevation resolution to
1-meter height increments. Each elevation pixel is a "short"
data type (signed 16-bit integer) providing positive and negative height
values. This version of the elevation/displacement/bump map image is
perfect for high-resolution flight simulator and visualization
Map (8-bit grayscale and 16-bit DEM versions)
TruEarth® 1km collection includes bathymetric elevation data of the
global sea floor in both 8-bit
grayscale and 16-bit DEM formats. The bathymetry datasets are available
down to the 4km-per-pixel resolution due to source data availability. This
dataset can be combined with the terrain elevation dataset to provide
complete elevation coverage for both land and sea areas.
Boundary Maps (Coastal Only)
TruEarth® 1km geo-political boundary images provide an additional layer of
information illustrating coastal, country, and internal political
boundaries. Boundaries are composed of single-pixel-wide lines in white
against a black background. Included is a coastal-only version (shown at
right) and four additional versions (see below).
Boundary Maps (Including Coastal)
primary TruEarth® 1km geo-political boundary images contain geographic coastal
boundaries and additional political boundaries, including: 1) country and
internal; and 2) country-only versions. "Country" boundaries
comprise international boundary and separation lines; "internal"
boundaries comprise state and province lines.
Boundary Maps (Without Coastal)
the geo-political boundary images with coastal boundaries, the non-coastal
versions provides the option of letting the base imagery convey the
coastline visually. The two non-coastal images include: 1) country and
internal and 2) country-only versions.
help with modifying the TruEarth® 1km color base imagery and as textures
themselves, the land/ice mattes separate land and ice from ocean. One
land/ice matte is land plus polar ice masses in white and ocean in black;
the second land/ice matte includes lakes and waterways in black along with the
ocean. The matte images can also be used as displacement maps to create
simple globe models with elevated land/ice masses.
the land/ice mattes, the land-only mattes can be used to modify color base
imagery or as textures themselves. The only difference is that polar ice
masses are not portrayed. Land appears in white and ocean in black; the
second matte includes lakes and waterways in black along with the ocean.
AND TILE FORMAT.
TruEarth® 1km imagery is provided in the industry-standard georeferenced
1km Tile Format:
TruEarth®: 8 tiles x 4 tiles; each tile 5,400 x 5,400 pixels
Total size = 43,200 x 21,600 pixels
TruEarth® 1km imagery collection is available off the shelf with delivery on DVD media.
(Full Image Collection)