Interactive Globe
This is a game based on the Digital Chart of the World, which shows the
elevation map of the entire earth, to the horizontal resolution of 3
arc-seconds ( about 1 kilometer on the equator), and a vertical resolution of
1 meter. You can point to any location on the earth and see the topology
around this location. You can zoom-in and zoom-out at will on the map. It
is a tutorial on F#, and you get the complete source code to evaluate it and
perhaps to enhance it. It is distributed on a CD. Shipping included.
The Digital Chart of the World (DCW) is a digital map of Earth. It is a
comprehensive geographical information system (GIS). The primary source
for this database is the United States Defense Mapping Agency's (DMA)
Operational Navigation Chart (ONC) 1:1,000,000 scale paper maps
produced by the US, Australia, Canada, and the United Kingdom. Detailed
information on DCW were described in a Defense Department document:
Military Specification Digital Chart of the World, MIL-D-89009, released on
13 April 1992.
Based on DCW, the Center for Earth Resources Observation and Science
(EROS) of U.S. Geological Survey completed the GTOPO30 project in 1996.
GTOPO30 is a global Digital Elevation Model (DEM) with a grid spacing of
30 arc seconds (approximately 1 kilometer on the equator). GTOPO30 was
been divided into 33 tiles.
I combine all 33 files into a giant DEM file with 21600 rows and 43200
columns. This file is about 1.8 Gbytes in size and contains the complete
elevation information of the whole earth. Each entry in this file is 2 bytes
long, containing an elevation value in meters. The byte order is big endian,
in the Motolora format, with the most significant byte first. The range of
elevation, as shown in the above table is from -407 M to 8752 M. A value
of -9999 represents sea level.
This giant DEM file is accessed interactively by click your mouse in this
Interactive Globe. When it is running, you see the globe map in a Canvas
window. Left clicking any spot on the map moves that spot to the center of
the display. Below the map is a line of buttons. Clicking the "Zoom In" or
"Zoom Out" button expands or compresses the map. Other button bring you
to a number of interesting locations. With this simple interface, you can
explore the entire earth down to the resolution of 3 arc-seconds.
This is a game based on the Digital Chart of the World, which shows the
elevation map of the entire earth, to the horizontal resolution of 3
arc-seconds ( about 1 kilometer on the equator), and a vertical resolution of
1 meter. You can point to any location on the earth and see the topology
around this location. You can zoom-in and zoom-out at will on the map. It
is a tutorial on F#, and you get the complete source code to evaluate it and
perhaps to enhance it. It is distributed on a CD. Shipping included.
The Digital Chart of the World (DCW) is a digital map of Earth. It is a
comprehensive geographical information system (GIS). The primary source
for this database is the United States Defense Mapping Agency's (DMA)
Operational Navigation Chart (ONC) 1:1,000,000 scale paper maps
produced by the US, Australia, Canada, and the United Kingdom. Detailed
information on DCW were described in a Defense Department document:
Military Specification Digital Chart of the World, MIL-D-89009, released on
13 April 1992.
Based on DCW, the Center for Earth Resources Observation and Science
(EROS) of U.S. Geological Survey completed the GTOPO30 project in 1996.
GTOPO30 is a global Digital Elevation Model (DEM) with a grid spacing of
30 arc seconds (approximately 1 kilometer on the equator). GTOPO30 was
been divided into 33 tiles.
I combine all 33 files into a giant DEM file with 21600 rows and 43200
columns. This file is about 1.8 Gbytes in size and contains the complete
elevation information of the whole earth. Each entry in this file is 2 bytes
long, containing an elevation value in meters. The byte order is big endian,
in the Motolora format, with the most significant byte first. The range of
elevation, as shown in the above table is from -407 M to 8752 M. A value
of -9999 represents sea level.
This giant DEM file is accessed interactively by click your mouse in this
Interactive Globe. When it is running, you see the globe map in a Canvas
window. Left clicking any spot on the map moves that spot to the center of
the display. Below the map is a line of buttons. Clicking the "Zoom In" or
"Zoom Out" button expands or compresses the map. Other button bring you
to a number of interesting locations. With this simple interface, you can
explore the entire earth down to the resolution of 3 arc-seconds.
Offete Enterprises
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