QGIS Training

Géoinformatique & Géocommunication

(10h Th, 20h labo, 80h proj)

TP n°1 (23/02/2016):QGIS

Pierre Stévens

pierre.stevens@ulg.ac.be

Basic

Are you crazy?

Advanced

Intermediate

Trap

Best practice

Repeat

Don't do that

CTRL + N

CTRL + SHIFT + R

/bingHam/raster/srtm.tif

Check Layer Properties

CTRL + SHIFT + V

/bingHam/vector/utah_faults.shp

Check Layer Properties

CTRL + SHIFT + R

CTRL + SHIFT + V

Check properties

Play with style

Open attributes table

/bingHam/vector/utah_faults.shp

Vector =

Geometry + Attributes

Create a new field with the field calculator

The map unit is in degrees

/bingHam/vector/utah-faults.shp

This new field contains the length of the faults in kilometers

It is recommended to define

BBOX

Y minLat. min

X minLon. min

X maxLon. max

Y maxLat. max

bingHam/vector/bbox-bingham50km

EPSG:4267

EPSG:4267 EPSG:3857 EPSG:4326

raster.tiff vector.shp dem.tiff

Datasource projections

Project projection (EPSG:4267)

EPSG:4267 EPSG:3857 EPSG:4326

raster.tiff vector.shp dem.tiff

Datasource projections

Project projection (EPSG:4267)

EPSG:4267 EPSG:4267 EPSG:4267

raster.tiff vector.shp dem.tiff

Enable on the fly CRS transformation

Try several Projected Coordinate Systems

/bingHam/quarantine

/bingHam/vector /bingHam/raster /bingHam/tables

Sanitize

Transform

1) Clip this vector layer to your project extent

Right click → Save As

Vector → Geoprocessing Tools → Clip

/bingHam/quarantine/soilConservationZone4326.shp

/bingHam/vector/soilConservationZone.shp

2) Reproject it to your project CRS

1) Add vector and raster layers

2) Open attributes table and play with symbology

3) Add new attributes to an existing vector layer

4) Play with projections

5) Clip and reproject

What we've done

View → Decorations → Scale bar

Clip this raster layer to your project extent

Raster → Extraction → Clipper

/bingHam/raster/srtm.tif

/bingHam/raster/srtm_bbox50km.tif

/bingHam/raster/srtm_bbox50km.tif

Raster → Extraction → Contour

Raster → Analysis → DEM

/raster/relief.tif /raster/hillshade.tif /vector/contours.shp

For faster rendering, build pyramids on raster file

Properties → Pyramids

/bingHam/quarantine

/bingHam/vector /bingHam/raster /bingHam/tables

Sanitize

Transform

Compose a map

CTRL+Por Project → New Print Composer

Layout → Add mapLayout → Add scalebar

...