Abstract
The need for rapid deployment of aerial and satellite imagery in support of GIS and engineering integration projects require new sources of geodetic control to ensure the accuracy for geospatial projects. In the past, teams of surveyors would need to deploy to project areas to provide targeted or photo identifiable points that are used to provide data for orthorecificaion, QA/QC and calibration for multi-platform sensors. The challenge of integrating street view, UAS, airborne and Space based sensors to produce the common operational picture requires control to tie multiple sources together. Today commercial off the shelf delivery of existing photo identifiable control is increasing the speed of deployment of this data without having to revisit sites over and over again. The presentation will discuss the processes developed by CompassData to build a global library of 40,000 control points available today. International Organization for Standardization (ISO) based processes and initiatives ensure consistent quality of survey data, photo identifiable features selected and meta data to support photogrammetrist, engineers and GIS professionals to quickly deliver projects with better accuracy.
Highlights
The idea of creating a global library of control points available off the shelf appeared based on the increasing requests for ground control points located all over the world
The individual request of the points had to be fulfilled by deploying team of surveyors into the desired area to conduct the geodetic measurement of targeted or photo identifiable points by GNSS methods, like GPS, Glonass, Galileo, etc
2.1.1 Classical geodetic approaches: The standard and classic approach to survey Ground Control Points (GCPs) is with GNSS equipment
Summary
The idea of creating a global library of control points available off the shelf appeared based on the increasing requests for ground control points located all over the world. Better sensors cover more land area with lower costs and there is larger demand for updated imagery products with higher resolution and improved accuracy. This usually affects the distribution and density of Ground Control Points (GCPs) and surveyors might have to revisit formerly covered areas. Targeted points are generally not as useful as for other projects than to which they were intended to mostly because of their short life spans From this follows that photo identifiable points are preferred solution to maintain the suitability of the entire archive (Rees, 1999).
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