In Today’s world, with GPS, we can survey ellipsoidal heights (h) with 5-10 cm accuracy for geodetic control points on land and differential heights (?h) between well defi ned topographic features with relative accuracy of 1: 1Million or better. In few specific cases, this type of accuracy may require specially designed GPS surveys. In navigational mode, an instantaneous positional accuracy of about ± 5 m is easily possible. As these heights are the direct product of the GPS survey(s) and thus defi ned with respect to the ellipsoid, which is a time-invariant zero reference surface, they can be used without any reference to the geoid or Mean Sea Level (MSL). If we recall, in the classical surveys, e.g., triangulations and/or traverses, the vertical angles used to provide the “?h” and thus there will not be any need to convert them to orthometric heights.

The environment of a Municipal Information system has undergone a sea change over last few years. Couple of years back the requirements of information system was designed and projected primarily from the planners community. They were satisfi ed if the physical information was supplied on a scale of 1:5000/ 1:10,000.

The 7th Asia Pacific ITS Conference & Exhibition was …

13,000 users attend ESRI’s 25th Annual User Conference

With nearly 13,000 users attending from more than 135 …

July 2005

IGARSS 2005

25 – 29 July 2005 Seoul, Korea

reg@igarss05.org

http://www.igarss05.org

25th Annual ESRI International …

NoCoordinates is a new section, where readers questions …

IV MURALI KRISHNA Professor and Head, Centre for Spatial Information Technology, Jawaharlal Nehru Technological University, Hyderabad
iyyanki@icorg.org

Geodesy is science of the measurement and mapping of the earth’s surface. Satellite Geodesy in an orderly intensive manner started with the launch of the first artificial satellite SPUTNIK in October 1957. By the year 1964, many basic geodetic problems …

We were taken aback.
We were taken aback when we were told by none other than the Wireless Advisor to Government …

As the designers and builders of infrastructure; surveyors, engineers and construction contractors know well the benefits gained from a strong infrastructure. Whether transportation, utilities or communication systems, infrastructure constitutes a society’s basic structure, the foundation upon which the growth of a community, state or entire nation depends.

While digital techniques were introduced to map production in the 1970’s, the driver for utilising digital tools to manage this wide range of activities was the land administration functions of the six states and two territories. Developed in concert by the legal and surveying professions, these state and territory based land administrations functions led to digital land valuation systems as early as 1968 in South Australia. Building upon such initiatives; government guaranteed computerised land registration and automated valuation systems have been built.