IRIDIUM Networks

GlobalTrack G200R IRIDIUM GPS Tracking System
Integrate both gsm/gprs and IRIDIUM dual radio system in one device
Very low latency time,send data from anywhere in the world in few seconds by IRIDIUM
IRIDIUM system support 66 satellites, G200R can work in high density city ,jungles and marines
Compare to other signle satellite system, IRIDIUM system can receive signal in all directions
Very low GPS message air time price, the cost will be lower than gsm SMS
Operate at 1.6G radio band frequency,G200R can be installed and tracking aircrafts
Support live video and fuel level real time monitoring
Worldwide vehice tracking web service with GlobalTrack WebMap with GOOGLE EARTH
Accessories include Camera ,Fuel level Sensor,Temperature Sensor,Vibrations sensor,G-sensor,Small Printer
Introduction to IRIDIUM Networks

The Iridium System is a satellite-based, wireless communications network providing a robust suite of Voice and Data services to virtually any destination anywhere on earth.

With 66 satellites forming a cross-linked grid above the Earth, the Iridium system is the first low-earth orbiting system for telephone service. Only 780km (450 miles) high, these satellites work different from those at a much higher orbit (26,000km) in two major ways. First they're closes enough to receive the signals of a handheld device; and second, they act like cellular towers in the sky - where wireless signals can move overhead instead of through ground based cells.

Frequency Bands

Telephone & Messaging 1616-1625.5 MHz,L-band
Intersatellite Links 23.18-23.38 GHz, Ka-band
Ground Segment Links
Downlinks 19.4-19.6 GHz, Ka-band
Uplinks 29.1-29.3 GHz, Ka-band


How to create websites that use Google Maps/Earth to map information in a back end database

Professor Nitu,
I am happy to be named a friend! I hope you and your students find this work useful. Sometime later this year I will release code on how to create websites that use Google Maps/Earth to map information in a back end database. You can see an example at

Hopefully, I will complete an e-book on how to program for KML mapping engines, both desktop and web based.


Bruce Ralston


AFF Mapper - programe freeware

My colleague geogprof writes "I have released a program called AFF Mapper. This is
a Windows based package that was specifically designed for creating KML based mapping files from TIGER shapes and tables available from the Census Bureau's American FactFinder web page. While it was designed for these files, it can be used to create KML files for other shapes (that are in decimal degrees with NAD83 or WGS 84) and external attribute files. The resulting KML files can be viewed in several free mapping packages such as Google Earth and ArcGIS Explorer. To download a copy of
the program and the user manual, go to
[1] This is freeware, copy till you drop. Source code will be released at a later date." See also related stories below.
Sa fiti iubiti!


10 Thoughts for Someone Contemplating a Geospatial Career

by Jeff Thurston

All things change over time. This includes geographic information systems (GIS), computer aided design (CAD), global positioning systems (GPS), remote sensing, surveying and a wide array of geospatial technologies and applications. What I would have said to someone embarking on a spatially related career ten years ago would be different than what I would say today. Some things have changed dramatically, others in new ways and some minimally. Here is what I’d say today to someone contemplating a geo-career, in no particular order.

1) GNSS is an integration of GPS satellite systems. You can actually use a GNSS receiver today and get excellent results. If you thought one GPS was good, then 2 or 3 are going to really open your eyes. GNSS is going to revolutionise all we know about location based services. It will create a whole new class of professionals interested in position and navigation.
2) GIS is the de facto integrator of spatial information. Focus on it. Learn how all other technologies are spokes leading toward its integration. If you understand it as existing on a level equivalent to business systems then you will have the power to strategically drive new business applications and directions.
3) 3D is the future. It is not just about data though, it is also about visualisation. Start using the phrase ‘elegant solution.’ Pay attention to the concept of ‘Digital Cities.’
4) Sensing will increasing play a role that is supported through legislation. Data matters and numbers matter. Carbon credits become a currency, for example, and geotechnologies the stock exchange. I can’t say enough about understanding monitoring and it’s linkage to geospatial technologies. The current economic crisis will eventually lead to transparency and more of it.
5) Our concept of time is not well defined in spatial technologies. We can do scheduling well, but being able to understand ‘change over time’ is becoming more meaningful. It also relates closely to real-time versus static operating environments.
6) Remotely sensed imagery will become more widely used. More satellites equal more data. But other new satellites are now going to be providing information about CO2, NOx, global soil information and so on. Linking those satellite data to imagery will mean projects become larger, involve more people and take on the character of spatial data infrastructure (SDI).
7) I can’t help but think that we heading toward a major shift in energy use, production and utilisation. The way I see it, oil and gas together with wind, solar and biofuels etc. will require a balanced approach with feedback loops to operational building systems, social factors and other impacts. We’re about to enter a more holistically oriented and managed energy scenario. This goes back to integration - GIS.
8 ) Think communities. Better and more efficient housing located near better and more efficienct tranportation systems.
9) Learn to write. Develop communication skills. Many of our colleagues tell me, “I wish I could write.” It will help you to share and collaborate on all the integration going on.
10) Find a mentor. A person who would agree to work with you as your career develops and who you would invest a time commitment toward. It can be daunting when starting out and many people can help you to get up to speed quickly. If you want a mentor, then simply ask them. But know what you are asking and be prepared to listen.