GPS Consulting Projects
White Pass & Yukon Railway
1996 (Kinematic GPS Survey - Skagway, Alaska to Whitehorse, YT)
This survey involved the positioning of over 100 miles of tracks and structures utilizing Trimble 4000ssi dual frequency GPS receivers. A kinematic profile of the tracks was obtained with a cart mounted GPS antenna which was towed behind a speeder.
The location of mile posts, points of switch, bridges, and crossings were established with event marks. Additionally the R/W boundaries were located by marking GPS events on found boundary monuments. Trimble GPSurvey was used for the GPS processing.
COGO cadastral compilation of the R/W was accomplished utilizing the GPS ties along with existing digital cadastral data from the Regional Surveyors Office and official plans.
Natural Resources Canada
1996 (Nunavut Land Claims Surveys - Cambridge Bay & Pond Inlet, N.W.T.)
Underhill was successful in obtaining two contracts to survey over 400 corners of the parcels of this land claim. Wild System 200 GPS receivers and RASCAL were employed.
MWH Geo-Surveys Ltd.
1996 (Northern Spain Precise Gravity and GPS Surveys)
Underhill provided GPS and survey project management expertise on this survey in northern Spain. Over 1,700 points were positioned. Wild System 200 receivers were used. RASCAL was employed in the adjustment and analysis of the control network.
Natural Resources Canada
1996 (CYFN Land Claims Surveys - Teslin/Mayo/Old Crow, Y.T.)
Underhill was successful in obtaining a five contracts to survey the corners of the parcels of this land claim. Wild System 200 GPS receivers and GeoLab were employed.
1995 (CYFN Land Claims Surveys - Eagle Plains, Y.T.)
Underhill was successful in obtaining a contract to survey the corners of the parcels of this land claim. Wild System 200 GPS receivers and GeoLab were employed.
Yukon Territorial Government - Community & Transportation Services
1995 (Town of Teslin - Airborne Kinematic GPS Photo Control)
Project was for the kinematic GPS control of 1:5,000, 1:7,500, and 1:20,000 photography. Wild System 200 dual frequency receivers were used exclusively.
Natural Resources Canada
1995 (Nunavut Land Claims Surveys - Bathurst Inlet, N.W.T.)
In association with Usher Canada Ltd., and Marshall Macklin Monaghan, Underhill was successful in obtaining a contract to survey 192 corners of the parcels of this land claim. Wild System 200 GPS receivers and GeoLab were employed. In addition to processing the data with the Wild SKI software an effort was made to process the data using NRCan's GPSPACE software in conjunction with CACS precise ephemeris and clock data. The results of this effort were reported to NRCan and will be the subject of a future paper.
IGS Corp./MWH Geo-Surveys Ltd./ESSO
1995 (GPS Positioning for Gravity Survey - T'chad, Africa)
Underhill provided GPS and survey project management expertise on this survey in southern Chad. Over 5,000 points were positioned. Wild System 200 receivers were used. Geolab was employed in the adjustment and analysis of the control network.
IGS Corp./Novacorp International Inc.
1995 (GASANDES Pipeline Mapping - Mendoza, Argentina to Santiago, Chile)
Underhill provided GPS and project management expertise on this photogrammetric mapping project of a proposed 450 Km gas pipeline corridor. Wild System 200 and Ashtech Z XII receivers were used. Geolab was employed in the analysis of the control network.
Triathlon Mapping Corp.
1995 (Resort Municipality of Whistler - Airborne Kinematic GPS Photo Control)
Project was for the control of 1:10,000 photography for orthophotography and digital mapping. Wild System 200's dual frequency receivers were used exclusively.
Natural Resources Canada
1994 (Sahtu Land Claims Surveys - Deline, N.W.T.)
In association with Usher Canada Ltd., Underhill was successful in obtaining a contact to survey the corners of 5 of the parcels of this land claim. Wild System 200 GPS receivers and GeoLab were employed.
D.C. Bazett & Associates
1994 (GPS Tunnel Control - Squamish, B.C.)
Underhill provided GPS control and network adjustment and analysis expertise on this project. Wild System 200 receivers and GeoLab adjustment software were employed.
Natural Resources Canada
1994 (Nunavut Land Claims Surveys - Arviat/Rankin Inlet, N.W.T.)
In association with Usher Canada Limited of Edmonton Alberta and Marshall Macklin Monaghan of Toronto Ontario, we were successful in obtaining 3 contracts for the survey of this 150,000 sq. mile land claim. The work involved monumentation and GPS positioning of the claim boundary bend points. Wild System 200 receivers were employed in static and rapid static mode.
Canadian Pacific Rail / BC Transit
1994 (Commuter Rail Project - GPS Control & Kinematic GPS Profiling)
This project involved the survey of some 60 Km of railway from Vancouver to Mission, B.C. Wild System 200 receivers were used exclusively. A monumented GPS control network was established to provide a framework control for the project. From this network kinematic GPS positioning was done to roving receivers mounted on a high-rail vehicle. Positions were collected along the route at 1 second intervals (approximately 5 metres on the ground). Attribute data for features along the route (mile boards, crossings, switches, signals, etc.) were collected in a hand-held data collector along with the time of collection for later correlation with the kinematic GPS data. The kinematic profile was used in conjunction with custom in-house software to determine the as-built alignment of the rails. Various least squares curve and line fitting routines were developed in Intergraph MDL to allow graphical determination of the alignment geometry. Accuracies achieved were at the 0.05 metre level. Additionally, significant detail topographic work with total station instruments was done at a number of locations along the line.
IGS Corp./MWH Geo-Surveys Ltd./ESSO
1995 (GPS Positioning for Gravity Survey - T'chad, Africa)
Underhill provided GPS and survey project management expertise on this survey in southern Chad. Over 5,000 points were positioned. Wild System 200 receivers were used. Geolab was employed in the adjustment and analysis of the control network.
IGS Corp./Novacorp International Inc.
1995 (GASANDES Pipeline Mapping - Mendoza, Argentina to Santiago, Chile)
Underhill provided GPS and project management expertise on this photogrammetric mapping project of a proposed 450 Km gas pipeline corridor. Wild System 200 and Ashtech Z XII receivers were used. Geolab was employed in the analysis of the control network.
Triathlon Mapping Corp.
1995 (Resort Municipality of Whistler - Airborne Kinematic GPS Photo Control)
Project was for the control of 1:10,000 photography for orthophotography and digital mapping. Wild System 200's dual frequency receivers were used exclusively.
Natural Resources Canada
1994 (Sahtu Land Claims Surveys - Deline, N.W.T.)
In association with Usher Canada Ltd., Underhill was successful in obtaining a contact to survey the corners of 5 of the parcels of this land claim. Wild System 200 GPS receivers and GeoLab were employed.
D.C. Bazett & Associates
1994 (GPS Tunnel Control - Squamish, B.C.)
Underhill provided GPS control and network adjustment and analysis expertise on this project. Wild System 200 receivers and GeoLab adjustment software were employed.
Natural Resources Canada
1994 (Nunavut Land Claims Surveys - Arviat/Rankin Inlet, N.W.T.)
In association with Usher Canada Limited of Edmonton Alberta and Marshall Macklin Monaghan of Toronto Ontario, we were successful in obtaining 3 contracts for the survey of this 150,000 sq. mile land claim. The work involved monumentation and GPS positioning of the claim boundary bend points. Wild System 200 receivers were employed in static and rapid static mode.