Since the staring of GPS, many researchers have investigated its application in aerial photogrammetry. Today, with the full constellation of 24 GPS satellites operational, enabling excellent satellite geometry any time of the day, the need to apply the full potential of GPS for real time aircraft navigation and photogrammetric mapping can be realized. The use of GPS to determine relative positional data for ground control points in a photogrammetric block adjustment is widely accepted and practiced. The camera exposure station coordinates derived by Airborne Kinematic GPS drastically reduces, the number of horizontal and vertical control points needed in aerial triangulation.

In large-scale mapping, the accuracy level of control data required is very high. The lag in time between the camera exposure and the GPS epoch recording in the GPS receiver is critical in deriving accurate coordinates for the exposure station (principal point) coordinates. Due to delay in the electronic transfer of data from camera clicking to GPS receiver in recording the event makes the Lag in time to occur. To meet the high accuracy requirements for the largescale photography and mapping projects the lag in GPS recording time should be derived and applied. In this study, an attempt is made to compute the Lag-time in airborne kinematic GPS derived exposure stations from aerial triangulation.

Aerial triangulation is carried in Digital Photogrammetry work station with conventional method of using ground control points, and the exposure station coordinates are derived. Lag-time is computed by finding difference in coordinates of exposure stations derived from conventional aerial triangulation and from airborne kinematic GPS. The results of this project will help to improve the locational accuracy of GPS derived exposure stations in aerial triangulation.
Methodology

Aerial photography is carried out in the study area on 1:6000 scale with forward overlap at 60% and lateral overlap at 20% using RMK TOP30/23 camera. During aerial photography the airborne GPS is operated to record the exposure coordinates.

The computer controlled navigation system (CCNS) is loaded with flight planning data from World Wide Mission Planning (WWMP). During aerial photography CCNS takes coordinates of aircraft position from navigation system and navigate pilot for alignment as per flight plan. Based on navigation coordinates, CCNS sends signals to camera for exposure. The camera exposure system is connected to Trimble 4000 SSI dual frequency GPS system on board, which records GPS data continuously at 1.0sec sampling rate. During the camera exposure, camera system sends signal to the onboard GPS system, which record each exposure as an event marker in the GPS

Last month, New York witnessed cab drivers’ strike.
A protest against a city rule that cabs be equipped with GPS.
Popular contention among others is that GPS is overly intrusive.
It might be possible that such protests are driven by vested interests.
Nonetheless, the privacy issues cannot be ignored.
Many feel that technology is spilling into the zone of …

October 2007

9th South-East Asian Survey Congress

28 October – 2 November, Christchurch, New Zealand

http://www.conference.co.nz/index.cfm/surveyors2007/

Nav 07

30 Oct 2007 -01 Nov 2007

www.rin.org.uk, conference@rin.org.uk

November 2007

IMTA (Asia Pacific) Annual Conference & Trade Show 2007

November 2 – 3, Gold Coast, Australia

imtaaspac@chariot.net.au,

http://www.maptrade.org/events/displayevent.php?id=79

International Symposium and Exhibition on Geoinformation & International Symposium on GPS/GNSS

05 – 07 Nov 2007, Johar Bahru, Malaysia

http://www.fksg.utm.my/isg07/index1.html

Trimble Dimensions 2007

November …

THE land-sea interface is one of the most complex areas of management in the world consisting of both the marine and terrestrial environments. The coastal zone is also home to an increasing number of activities, rights and interests. Population along the coastline is continuously increasing, bringing about new pressures on the fragile eco-system of the coastal zone. This has brought with it an increased need to more effectively and efficiently manage this area to meet the economic, environmental and social outcomes of sustainable development.

In particular the comfortable and mobile access to the internet were here the driving factors. Access points can nowadays be found in our daily environment, e.g. in many office buildings, public spaces and in urban areas. Parallel to this development there is meanwhile substantial interest in offering the user information which refers to the current location of the user (so-called Location Based Services LBS). Such Location Based Services, however, will be accepted by the user only if the cost performance ratio is satisfactory. If existing infrastructure such as WiFi without additional hardware installation can be used for location determination, then the realization costs are small and the service can be offered under attractive conditions. Several systems are nowadays available for location determination using WiFi signals. Their major application is the location determination of persons and objects inside buildings.

It is not just having computers in offices or creating websites, but it involves the creation of systems; integrating technology with administrative processes; human resources and dispensing information and services faster to the citizens. e-Governance offers a number of advantages for the government as well as the public. It shifts the centre of power from human agencies to technology, which is easier to deal with. For example, if a citizen wants some information on building codes, he/she has to go to the office of the local authority to get it, often shuttling from one table to another. If such information is made available on websites, it makes things easier for the citizens as well as the authorities.

SVLBI (Space Very Long Baseline Interferometry) is an extension of the ground-based VLBI into the space. It has some important potential applications in geodesy and geodynamics, including the definition, practical realization, and the interconnection of different reference frames, determining the geocentric positions of VLBI stations, estimation of the gravity field of the Earth, and satellite orbit determination using the delay and delay rate observables.

It is not simply a project.
It is an ambition.
An assertion of technology.
And taking the technology beyond the realms of monopoly.
There are hurdles. Political and economical.
But stronger is the will to overcome them.
There are confl icts. On approach and interest.
There are frustrations on the delay. And, at stake is the credibility.
Still, there is a resolute to …

October 2007

36th Annual ILA Convention and Technical Symposium!

October 14-17, at the Embassy Suites Orlando International

Drive Orlando, Florida, USA

9th South-East Asian Survey Congress

28 October – 2 November,

Christchurch, New Zealand

http://www.conference.co.nz/ index.cfm/surveyors2007/The

Nav 07 Navigation Conference & Exhibition

30 Oct 2007 -01 Nov 2007

http://www.rin.org.uk

conference@rin.org.uk

27th INCA International Congress

Visakhapatnam, India

21-23 November 2007

www.hydrobharat.nic.in/Ist_Circular_INCA_2007.pdf

14th Session of the Asia-Paci?cRegional Space Agency Forum

21-23 November

Bangalore, India

www.aprsaf.org/text/ap14_info.html

ESRI …

Zheng He’s Exploration of the Western Pacific Ocean and the Indian Ocean was an important event at the turning point of the world history. It was a golden opportunity for China to strengthen itself and make greater contributions to human beings. Unfortunately, to some extend, Zheng He’s magnificent feat in the history of navigation was later considered as a sheer waste of energy and money and a “failure policy”, and thus was put an end to. Zheng He’s trip, therefore, did not produce long-term effects. China still cut off itself from the out side world and stopped her exploration of ocean navigation, while Europeans, along the routes opened up by their expeditions, reached America, Africa and Asia and established colonies all over the world, which greatly promoted the capitalist development. In spite that the scale of Zheng He’s navigation far exceeded that of Columbus’s “Great Discovery” which followed some 80 years afterward, the former had much less effect on the progress of the world history.