---------------------------------------------
# 2018 Unmanned aerial system (UAS)-derived orthoimage mosaics and digital terrain models of the  SE margin and NE distal lava flow margin, Holuhraun lava flow-field, Vatnajökull National Park, Iceland

Preferred citation (DataCite format):

  Scheidt, Stephen P.; Hamilton, Christopher W. (2019).
  2018 Unmanned aerial system (UAS)-derived orthoimage mosaics and digital 
  terrain models of the  SE margin and NE distal lava flow margin, Holuhraun 
  lava flow-field, Vatnajökull National Park, Iceland.
  University of Arizona Research Data Repository.
  Dataset. https://doi.org/10.25422/azu.data.13277298.


Corresponding Author:   
  Christopher W. Hamilton, University of Arizona, chamilton@email.arizona.edu


License:
  CC BY-NC-SA 4.0


DOI:
  https://doi.org/10.25422/azu.data.13277298



---------------------------------------------
## Summary

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 ±1s) in the x, y, and z directions (i.e., latitude,
longitude, and elevation) of terrain points for 2016 are estimated to be 4.1
cm, ± 3.1 cm, and ± 5.8 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** 2018-08-03  

* * *

  
 _For inquiries regarding the contents of this dataset, please contact the
Corresponding Author listed in the README.txt file. Administrative inquiries
(e.g., removal requests, trouble downloading, etc.) can be directed to data-
management@arizona.edu_  
  
 _ _This item is part of[Unmanned aerial system (UAS)-derived orthoimage
mosaics and digital terrain models of the northeastern portion of the
Holuhraun lava flow-field,
Iceland](https://doi.org/10.25422/azu.data.c.5214641)__