Using the UX5-HP imaging system, aerial images were acquired over the SE and NE Holuhraun lava flow margin, adjacent interior and adjacent river systems. The images were captured in JPEG format using a Sony A7R digital camera with a 36 megapixel high-sensitivity CMOS sensor and a 15 mm focal length lens. Images were geocoded after postprocessing of the device's onboard GNSS GPS receiver and a Trimble R10 Differential Global Positioning System (DGPS) base station. The R10 DGPS is capable of producing survey points with excellent precision (0.8 cm horizontal and 1.5 cm vertical). This allows calculation of the plane’s exact flight paths. Combined with the exact timing of the camera shutter, the positions of each image acquisition is known during the flight path and are therefore airborne control points. Images were processed into geodetically-controlled digital terrain models (DTMs) and orthomosaics using the commercial software package Trimble Business Center version 3.81. The mean standard deviations (at ±1σ) in the x, y, and z directions (i.e., latitude, longitude, and elevation) of terrain points for 2016 are estimated to be ± 3.0 cm, ± 4.0 cm, and ± 6.4 cm, respectively. The orthomosaic tiles have a spatial resolution of 4 cm/pixel; the DTM has a resolution of ~19.6 cm/pixel.
Topic Categories (ISO 19115) elevation, geoscientificinformation, imageryBaseMapsEarthCover
Feature and Attribute Definitions
A georeferenced raster displaying elevation data generated from digital camera image data using multi-view stereophotogrammetry methods.
Date of Content
2016-07-30 to 2016-07-31
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