Contact: Dr. Daniel F. Carlson, daniel.carlson@hzg.de

This dataset includes eight files, in addition to this README file:

20170726_Qeqertarsuaq_DEM.kml		20170726_Qeqertarsuaq_model.jpg
20170726_Qeqertarsuaq_DEM.tif		20170726_Qeqertarsuaq_model.mtl
20170726_Qeqertarsuaq_Ortho.kml		20170726_Qeqertarsuaq_model.obj
20170726_Qeqertarsuaq_Ortho.tif		20170726_Qeqertarsuaq_report.pdf

OVERVIEW

These files show a grounded iceberg off the northern coast of Qeqertarsuaq Island in Northwest Greenland (71.669N, 53.433W) on 26 July 2017. These files were created by from 127 images acquired by a DJI Phantom 3 Standard quadcopter (12 megapixel still images) unoccupied aerial vehicle (UAV). The images were processed using Agisoft PhotoScan Pro (v1.4 Linux Ubuntu). The images were collected as part of the Mission Arctic sailing expedition to western Greenland (http://www.missionarctic.com/). 

HOW TO VIEW THESE FILES

The .obj 3D model can be viewed using Meshlab, an open access software http://www.meshlab.net

The following instructions were tested on the Mac version of Meshlab. The process should be similar on Windows and Linux, but has not been tested or verified. 

+ Download and install Meshlab
+ File -> Import Mesh
+ Select the ‘.obj’ file
+ Wait for the mesh to load - this can take 30-60 s depending on your computer
+ If the Info Panel is not open, View -> Show Info Panel
+ To change the appearance of the model, click on the cylinder icon and options for ’Shading’, ‘Color’, and ‘Back-Face’ will appear
+ NOTE: if ‘Color: Face’ is selected the model will appear in all white; to change this select ‘Color: Vert’

For more information about Meshlab- read their documentation. 

The .pdf file is a 3D model that can be viewed in Adobe Acrobat Reader. For instructions on how to view 3D content in Adobe Acrobat Viewer, please visit https://helpx.adobe.com/acrobat/using/enable-3d-content-pdf.html

The orthomosaics and DEM can be viewed in Google Earth. Open Google Earth and select  File -> Open -> and navigate to the .kml file of the orthomosaic or DEM that you wish to open. 

The orthomosaics and DEM can also be viewed in QGIS. Open QGIS Desktop, and select Layer -> Add Layer -> Add Raster Layer. Under 'Source Type', select 'File.' In the 'Source' field, click on the icon with the ellipses (three dots) next to the 'Raster Datasets' and select the .tif file that you wish to view. After the DEM or orthomosaic loads into the current layer, it will likely appear distorted. In the lower right hand corner of the QGIS window, click on the coordinate reference system (CRS) icon, which likely reads EPSG:4326. Change the CRS to WGS 84 / UTM zone 21N, then click 'Apply' and 'Ok'. Now the DEM or orthomosaic should be scaled correctly. 

Ref:

Carlson et al. The Mission Arctic citizen science sailing expedition to western Greenland and Baffin Bay. Manuscript in preparation for Frontiers in Climate.