http://ericcolburn.com/2009/06/10/professional-land-surveyor-survey-do-you-use-gis/#utm_source=feed&utm_medium=feed&utm_campaign=feed Professional Land Surveyor Source Thu, 18 Mar 2010 16:22:31 +0000 http://wordpress.org/?v=2.9.2 hourly 1 http://ericcolburn.com/2009/06/10/professional-land-surveyor-survey-do-you-use-gis/comment-page-1/#comment-466 Gary W Breisch Fri, 12 Jun 2009 01:53:39 +0000 http://ericcolburn.com/?p=2738#comment-466 I feel that a form of GIS, I call it SAGES is the way for surveyors to go. With Google Earth tools and such, one does not have to have one of those expensive GIS software packages. Like most Surveyors, I do not make enough money to afford the cost of GIS software. The challenge is to get Google Earth to communicate with surveyors to make map corrections and shift their photos so that they have a higher degree of precision. Most of the aerial photo overlays in the Tulsa area are 50 to 100 feet off and could be greatly improved using WGS84 datum for real points intersections of visible objects that can be set to high precision by surveyors using the CORS system to convert their static gps data to the NAD83 NGS NAVD88 and WGS84 corresponding coordinates (lat/lon included). That is what I do now for aerial photo jobs is find an intersection or corner of a sidewalk or driveway that is distinctive enough to log and use to give them high precision for their processing without the need for targets especially in towns where their is a lot to pick from. Sometimes targets are necessary out in the boonies but I do not get many surveys for aerial photography topos there. I feel that a form of GIS, I call it SAGES is the way for surveyors to go. With Google Earth tools and such, one does not have to have one of those expensive GIS software packages. Like most Surveyors, I do not make enough money to afford the cost of GIS software. The challenge is to get Google Earth to communicate with surveyors to make map corrections and shift their photos so that they have a higher degree of precision. Most of the aerial photo overlays in the Tulsa area are 50 to 100 feet off and could be greatly improved using WGS84 datum for real points intersections of visible objects that can be set to high precision by surveyors using the CORS system to convert their static gps data to the NAD83 NGS NAVD88 and WGS84 corresponding coordinates (lat/lon included). That is what I do now for aerial photo jobs is find an intersection or corner of a sidewalk or driveway that is distinctive enough to log and use to give them high precision for their processing without the need for targets especially in towns where their is a lot to pick from. Sometimes targets are necessary out in the boonies but I do not get many surveys for aerial photography topos there.

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