A Carthography of Receding Glaciers on Svalbard | The Use of Open Source Geo-Data & GIS Software | Tooling Workshop

Area of Investigation: Kronebreen & Kongsvegen on Spitzbergen | Size of Terrain: 20 x 20 km | Source of Data: The Norwegian Polar Institute, Kartverket, Geonorge | Software: QGIS


PART I

Workshop 16/17 September


Workshop Database:https://we.tl/t-c7f2UM66uf
Workshop Software Package:https://we.tl/t-udAUTyRg1t

>>> you will also find most of the relevant links also on: https://digital-landscapes.com/raw-studio/ The Site will be updated during the Workshop | To unzip files you can use: 7-zip (free software installer)

Xmin-Xmax-Ymin-YmaxAreaFile
DTM5453000-455500-8757500-87600002,5 x 2,5 kmGeoTIFF
DTM5446000-456000-8753000-876300010 x 10 kmGeoTIFF
DTM5442500-462500-8748000-876800020 x 20 kmGeoTIFF

QGIS

01 | Set the CRS to EPSG: 25833 – ETRS89 / UTM zone 33N

Project>Properties>CRS and also under: Settings>Options>CRS>Use a default CRS


02 | Link Ortho Image via WMS/WMTS

WMS-Layer in QGIS: LINK_Ortofoto_Svalbard_WMTS_25833

add more WMS Layers (Geology / Biology / Glaciology)

Extract Transformation/Changes over Time | Compare orhto- and satellite-image > change Blending Mode to difference > see the movement of the ice | https://www.unis.no/dynamics-svalbard-glaciers/

what layes underneeth the ice surface?


03 | Download and Reference Digital Terrain Model (DTM)

For a high resolution Terrain Model of the Area of Kronebreen and Kongsvegen download below the GeoTiff # 13822 | Also you will find at the Norwegian Polar Data Center DTM’s in 20m and 50m Grids

DTM 5m Grid Delmodell 5m 2009_13822_33 (GeoTIFF)
DTM 20m Grid Terrengmodell Svalbard 20m (GeoTIFF)
DTM 50m Grid Terrengmodell Svalbard 50m (GeoTIFF)

Unzip Folder >>> QGIS >>> add Raster Layer > Browse to Database > select .TIFF file


04 | Adjust Symbology & Transparency

Change Style Settings: Custom Ramps, Colour, Blending Mode, Transparency …


Add High Resolution DTM 5m – 13822

add Raster and Change style settings e.g.: to Hillhade, or to ‘Singleband Pseudocolor’ Layermanagement


05 | Clipping Raster Data

Extract 10 x 10 km area of the DTM5m > go to: Raster > Extraction > Clip Raster by Extend |


07 | Extract Layer Extend

Extract Extend of the Raster as SHP Layer | rename layers | save to FGDB (FileGeoDataBase) | adjust style settings


08 | Extract Contours

Extract Contour Lines at an Custom Intervall

09 | Raster Calculator

using simple Expressions … like Masking: (“elevation@1” >= 0) * “elevation@1”; Culling: (“elevation@1” < 300) * 1 + (“elevation@1” >= 300) * 200

https://docs.qgis.org/2.8/en/docs/user_manual/working_with_raster/raster_calculator.html

"elevation@1" > 200 AND "elevation@1" > 300 | e.g.: all Points with an elevation of 200 and 300 m

10 | Adjust Layersettings, Color Ramp

Style Settings


11| Basic Terrain Analysis – Using SAGA GIS

Basic Terrain Attributes: Slope, Aspect, Water Flow, Topographic Wetness, Curvature


12 | Calculation of More Grid Data

More Terrain Attributes: Solar Analysis / Topographic Openness / Wind Exposure


13| Saving Raster and Vector to Database

Export ESRI-Grid / ASCII / XYZ / GeoTIFF / JPG / PNG / SHP / DXF

14 | Adding Vector Data to QGIS

15 | Graphic Composition

Layering Information


Glacial Ice Lines | Melted Ice from 1972 until 2001 | Sample Terrain of Svalbard | Visual Analytics: Marc Ihle | Data Source: Norwegian Polar Institute
Img.1.: Glacial Ice Lines | Melted Ice from 1972 until 2001 | Sample Terrain of Svalbard | Visual Analytics: Marc Ihle | Data Source: Norwegian Polar Institute

Img.2.: Using the Layout Manager in QGIS | Map of Kronebreen/Kongsvegen | 20 x 20 km Area | Sample Terrain of Svalbard | Visual Analytics: Marc Ihle | Data Source: Norwegian Polar Institute

16 | Export Maps

Using the Print Composer / Layout Manager

Img.2.: Map of Kronebreen/Kongsvegen | 20 x 20 km Area | Sample Terrain of Svalbard | Visual Analytics: Marc Ihle | Data Source: Norwegian Polar Institute