Medium-resolution (30, 60, 90m) global satellite imagery in simulated true colour
- "Earth Land Surface 2000 (ELS2000) "
 |
or display in Google Earth |
All 883 mosaic tiles of NASA GeoCover
2000 (Landsat ETM+ bands 7/4/2) are first transformed
into
natural colors and then re-projected from separate
60 UTM zones into a consistent
geographical latitude/longitude system, in order
to form a global mosaic.
ELS2000 can be provided at various spatial resolutions:
| Resolutions | Coverage (Longitudes 180W-180E, latitudes 60S-85N) |
Details | ||||||||||||||||
| 90m |
|
Single file in JPEG2000, ECW or other formats - US$ 800 for
a Company / Agency / University wide license
|
||||||||||||||||
| 60m |
|
Single file in JPEG2000, ECW or other formats - US$ 1,200 for
a Company / Agency / University wide license |
||||||||||||||||
| 30m (28.5m) |
Near global coverage except Antarctica; longitudes 180W- 180E, latitudes 60S-85N
|
883 mosaic tiles, as shown in Figure 1 - US$ 1,500 for
a Company / Agency / University wide license
|
||||||||||||||||
All above three datasets:
|
|
Release date: 01/2009 - US$ 1,800 for
a Company / Agency / University wide license
|
||||||||||||||||
| 15m (14.25m) |
Check out the unique false-to-true colour
simulation tool >>
|
Two global mosaics - ELS2000 (resolution 90m) and ELS2000 (60m), are derived from ELS2000's 883 mosaic tiles at 30m-resolution.
Delivery
Media:
ELS2000 datasets are usually stored on external hard drives with
USB 2.0 compliant interfaces.
Projection:
ELS2000 (30m) - Original
UTM WGS84 (recommended) or Latitude/Longitude Geographic WGS84.
ELS2000 (90m or 60m) - Latitude/Longitude Geographic WGS84.
Format:
ELS2000 (30m) - JPEG2000, ECW, GeoTIFF - readily to be used by all GIS software
ELS2000 (90m or 60m) - JPEG2000, ECW or other formats
Pixel resolution:
ELS2000 (30m) - 0.000277777 degrees (about 30m at the Equator, Geographic WGS84) or 28.5m (for UTM WGS84)
ELS2000 (90m or 60m) - 90m or 60m
Number of mosaic tiles:
ELS2000 (30m) - 883 (for a near global coverage except Antarctica; longitudes 180W- 180E, latitudes 60S-85N)
ELS2000 (90m or 60m) - single file
Total file size:
ELS2000 (30m) - JPEG2000, ECW format: ~200GB (for UTM WGS84) or ~200 GB (Geographic WGS84)
ELS2000 (30m) - GeoTIFF format: ~600GB (for UTM WGS84) or ~1,200 GB (or 1.2TB, Geographic WGS84)
ELS2000 (90m) - 3.5 to 20GB, depending upon compression ratios for JPEG2000 or ECW format
ELS2000 (60m) - 10 to 50GB
"Earth Land Surface 2000" is based on NASA's orthorectified Landsat ETM+ GeoCover 2000, which consists of a total of 883 mosaic tiles (or 8500+ scenes) covering the entire earth land surface except Antarctica. Each original mosaic in a compressed form contains three pan-sharpened, false-colour bands at a spatial resolution of 14.25 m:
Band 7 (mid-infrared) displayed as red
Band 4 (near-infrared) displayed as green
Band 2 (visible green) displayed as blue
Original mosaics in UTM WGS84 were successfully converted into natural- or true-colour composites at a re-sampled resolution of 28.5 m, after (a) applying GeoSage's spectral analysis techniques, (b) leveraging between spatial details and the total file size of images, and (c) correcting a dozen of corrupted files provided by a data vendor. True-colour outputs still retain the specifications of GeoCover 2000:
- All image scenes acquired during 1999-2003
- Projection and datum/spheroid: Universal Transverse Mercator and
World Geodetic System 1984 (WGS84). Between latitudes 60N-60S,
each mosaic is with the typical size of 6 (longitude) X 5 (latitude)
degrees; north of latitude 60N, each mosaic with the typical size of
12 X 5 degrees. To avoid the gaps between adjacent UTM zones
(a total of 60) when they are re-projected to others (e.g.,
geographical latitude / longitude), each mosaic extends for at least
50 km to the east and west, and 1 km to the north and south (Figure 1).- Cloud cover: 90% of imagery with 10% or less cloud cover
- Absolute positional accuracy: <50 m root-mean-square error
A robust spectral
transformation and colour balancing scheme was
developed and applied across all individual mosaics.
The result is a
consistent and visually-appealing representation
of global land surfaces
circa 2000. This medium-resolution dataset offers
an incredibly low cost
and affordable solution to a wide range of visualisation-related
applications. The 30m-resolution output (Geographic WGS84) can be subsequently resampled to 60m, 90m, 120m, 150m, 180m, 210m, or 240m.
 |
Figure 1: Locations of 883 mosaic tiles used in GeoCover 2000 and "Earth Land Surface 2000". Also see the overview of each of 883 tiles.
1. Samples with a regional view
|
|
|
|
|
|
 London |
 Paris |
 Oslo |
 Istanbul |
 Cairo, Nile River Delta |
 Lhasa |
 Shanghai |
 HongKong |
 Taiwan |
 Tokyo |
 Sydney |
 Canberra |
 Melbourne |
 Christchurch |
 Auckland |
2. Samples with a full spatial resolution of 28.5 m
|
 San Diego |
 Al-Qassasin, Egypt |
 Tokyo Bay |
 Kaohsiung, Taiwan |
 Sydney |
|
 Clyde River, South Island,
NZ |
3. "Alive" (with a full spatial resolution of 28.5 m)
|
 UTM Zone 16N, Latitudes
80-85 (size 15.5 MB) |
 UTM Zone 40N, Latitudes
20-25 (size 11.7 MB) |
4. Regional mosaics
 |
| e.g., 14 tiles are used to make the Landsat Mosaic
of SE Australia, including New South Wales, Australia
Capital Territory, Victoria, South Australia,
and the Murray-Darling Catchment (wiki) Image size: 108000 x 54000 |