We have found that leveraging the onboard GPS capability of smartphones with GIS-based data layers in the field has increased production. The user arrives here via a hyperlink from another screen (FIGURE 2). The field surveyors are also given hardcopy maps of the target locations and control stations, but those are now only used as a backup to the KML files loaded onto the smartphones.įIGURE 3. The NGS control station layer hyperlinks to the NGS website, so the field surveyor always has the recovery note available in an electronic format. The heads-up capabilities of GPS aboard the smartphones and KML files can also show the easiest path to reach either target location or control stations. Having the stereo model limits as a data layer becomes a handy piece of information in the event an aerial target must be relocated because of unfavorable field conditions. The ground control is combined with the airborne GPS to provide the orientation of the individual exposures, and it establishes the coordinate space of that imagery for any subsequent products. Each typically has a 60 percent overlap with its adjacent image, so it can be viewed and mapped in stereo. A stereo model is the overlapping portion of two adjacent aerial images. The aerial target layer also shows the proposed locations of stereo model limits on the smartphone. KML was developed for use with Google Earth - originally named Keyhole Earth Viewer. KML is an extensive markup language (XML) notation for expressing geographic annotation and visualization within Internet-based, two-dimensional maps and three-dimensional Earth browsers. A flight management system automatically triggers the camera or sensor once it reaches the exposure station in the air. Airborne GPS positioning aids in controlling aerial photography as the pilot navigates from exposure to exposure. Highway Interchange displayed on a smartphone using Google Earth App for Android, (ground targets in blue, flight information for pilots in red and green).
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