Optimal GCPs with Onboard GPS

Block Adjustment for Photogrammetric Production of Map of Iran
The collection of Ground Control Points (GCP) for block adjustment is a costly and time-consuming operation. Onboard GPS enables a reduction in the number of GCPs without loss of accuracy. The authors tested configurations of GCPs when using onboard GPS for achieving optimal accuracy in production of an overall map of Iran. The use of GPS in photogrammetric mapping began almost from the inception of GPS technology. Initially, GPS was used to obtain the coordinates of GCPs. GPS saved time and labour as compared to conventional surveying methods, producing more reliable coordinates whilst reducing costs. In the next stage, GPS... (read more)
2005-09-14 12:00:00

GPS IIR-15 in Orbit

A ‘replenishment’ Block-IIR Global Positioning System (GPS) satellite for the U.S. Air Force has been put into orbit. The Delta II rocket carrying the GPS IIR-15 (M) spacecraft lifted off from Space Launch Complex 17A at Cape Canaveral Air Force Station, FL, USA, at 2.50pm EDT on 24th September. Following a nominal 68-minute flight, the rocket deployed the satellite into a transfer orbit. The GPS IIR-15 (M) is the second of the modernised GPS satellites incorporating various improvements to provide enhanced accuracy, resistance to interference and performance for users. The Boeing Delta II 7925-9.5 configuration vehicle used for the mission... (read more)
2006-09-26 12:00:00

First GPS-ready Digital Camera

Ricoh Corporation (CA, USA) has launched the Pro G3, a high-resolution digital camera that embeds captured images with GPS coordinate information received from either its on-board GPS unit or from external GPS devices. Once these captured 'geo-images' are transferred to a PC they are automatically converted to shape files or merged into geo-databases for instant integration into GIS. In addition to storing GPS data in the image, the camera also utilises a user-configurable data dictionary for tagging pictures with workflow-related information. These attributes are easily accessible from the GIS layer table for automated database integration. The robust camera features a... (read more)
2005-03-17 12:00:00

GPS: Position, Time and Distance

Receiver position is calculated from the position of satellites and the distances to them. Distance is calculated from the time a radio signal travels between satellite and receiver. But how do we know the satellite’s position and how is travelling time determined? Satellite positioning – I know what it is, I know what it does, but how does GPS work? How satellites measure distance Basically, satellite positioning is a trilateration problem. From the known position of three satellites and the measured distances between them and the receiver, coordinates of receiver position can be calculated. The distances are determined by multiplying... (read more)
2005-06-09 12:00:00

Cm Precision GPS Mapping Solution

KOREC (United Kingdom) has launched a new system that makes RTK cm precision GPS a viable solution for the mapping market. By combining a Trimble RTK GPS Receiver, Trimble’s VRS Now Service and FastMap Tablet GIS Data Capture software, a cost- effective, simple, real-time, 3D, cm precision GIS Data Capture against the OS MasterMap has now moved into the mainstream for GIS mapping users. The introduction of Trimble’s VRS Now service has eliminated the need to use a GPS base station together with the time consuming complexities associated with setting it up. The service provides end users with instant access... (read more)
2007-02-02 09:54:22

Discussion LightSquared in GPS Debate

This video shows the presentation of LightSquared in the debate on the use of the L-band, adjacent to the GPS band. The presentation was made during the Survey Summit at the Esri User Conference in San Diego, USA, in July 2011. The Coalition to Save our GPS also held a presentation.   Presenter was Jeff Carlisle of LightSquared. Please click to access the movie.   The Coalition to Save our GPS also took the stage to hold a presentation. Please click to see the contribution by Peter Large of Trimble.   Access to movies of all presentations of the Survey... (read more)
2011-09-01 10:12:36

Rugged Sub-metre GPS Solution

Juniper Systems is offering the Archer 2, a budget-friendly, easy-to-use sub-metre GPS solution using Esri ArcPad, Effigis’ EZSurv Post-Processing software and its ultra-rugged handheld computers. The company will be presenting this solution at Stand 2212 at the Esri User Conference in San Diego, USA, from 20–24 July 2015. This device involves collecting GIS data using a Juniper Systems rugged handheld running ArcPad data collection software, and then using Effigis’ EZSurv software to post-process the data, resulting in sub-metre GPS accuracy. Users can import and export data, including custom attributes, from their GIS. This data collection process bypasses the need for... (read more)
2015-07-20 01:42:42

New GPS Photo Mapping Product

GeoSpatial Experts (CO, USA) has unveiled a new GPS photo mapping product bundle that includes a Pentax digital camera, Garmin handheld GPS receiver and the GeoSpatial Experts GPS-Photo Link software. The Pentax-Garmin package is the third GPS-Photo Link mapping product bundle offered by GeoSpatial Experts. GeoSpatial Experts is the developer of GPS-Photo Link, a digital image mapping software that saves time and money by automatically linking digital photographic images to GPS location data in the GIS environment. GPS-Photo Link creates web pages in which the watermarked photographs are integrated with satellite imagery, street maps, and any other GIS-based mapping layer. (read more)
2006-02-01 12:00:00

NOAA to Ensure GPS Accuracy

NOAA will lead an international effort to pinpoint the locations of more than 40 global positioning satellites in Earth orbit, which is vital to ensuring the accuracy of GPS data that millions worldwide rely upon every day for safe navigation and commerce. NOAA personnel will compile and analyse satellite orbit data from 10 analysis centres worldwide to ensure the accuracy of GPS information. For the next four years NOAA's National Geodetic Survey will serve as the Analysis Centre Coordinator for the International Global Navigation Satellite Systems Service, a voluntary federation of more than 200 organisations that provide continuous global satellite-tracking... (read more)
2008-01-09 01:57:43

Hemisphere GPS Wins ASTech Awards

Hemisphere GPS (Canada) has been announced winner of the Alberta Science and Technology (ASTech) Leadership Foundation Award for its outstanding commercial achievement in science and technology in the businesses over $25 million category. The ASTech Awards are among the highest honors available to individuals and organisations whose outstanding work has had an impact on science, technology, business, medicine, the environment and the lives of people in Alberta and worldwide. Earlier this month, Hemisphere GPS was also recognised by the Canadian Manufacturers and Exporters and the National Research Council of Canada for its innovative Crescent GPS Technology. On 16th October, Hemisphere... (read more)
2008-10-28 09:10:26
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