Laboratorio del corso di modellazione idrologica - uso di GRASS GIS per la delimitazione di un bacino idrografico

1. Potenza, 17 Dicembre 2010
Master PROIDRO - Corso di Modellazione Idrologica
Introduzione all'uso di GRASS GIS
per la modellazione idrologica
Ing. Margherita Di Leo

2. GRASS = Geographic Resources
Analysis Support System
http://grass.fbk.eu/
GIS = Geographic Information System
Open Source Software
Download:
http://grass.fbk.eu/download/software.php
Sample data download:
http://www.grassbook.org/data_menu3rd.php

3. Organization of data
GRASS DATA SET GRASSDATA
Gauss-
LOCATION UTM33WGS84 UTM33ED50 BoagaRoma40
FusoEst
MAPSET USER1 USER2 USER1 USER1
PERMANENT PERMANENT PERMANENT

4. North Carolina (NC, USA) data set
Raster, vector and satellite data
# Vector data include administrative boundaries, census data, zipcodes, firestations, hospitals, roads and railroads,
public schools and colleges, bus routes, points of interest, precipitation, hydrography maps, geodetic points, soils
and geological maps.
# Raster data include elevation (NED 3arc-sec, SRTM-V1 30m, lidar derived DEMs at 1m and 6m), slope, aspect,
watershed basins, geology, and landuse. The resolution of raster maps is 500m, 30m, 10m, and 1m.
# Imagery data include 1m resolution orthophoto, several LANDSAT-TM5/7 scenes and a MODIS daily Land
Surface Temperature (LST) time series.
# Also multiple-return lidar data are included

5. GUI (graphical user interface)
Path to
GRASS data set
Location
Mapset
Start

6. GUI (graphical user interface)
Map Display
Layer Manager
Map Layers
Command console
Search module
Terminal

7. GUI (graphical user interface)
Layer Manager
Map Layers Search module
Command console

8. Current region (g.region -p)

9. Set region (g.region)
g.region rast=elevation@PERMANENT -p

10. Query
Visualization
Add raster layer
Display Add raster layer Show attribute
Zoom table
Layer
Coords

11. Slope & aspect (r.slope.aspect)
r.slope.aspect elevation=elevation@PERMANENT slope=pendenza aspect=esposizione

12. Slope & aspect (r.slope.aspect)
r.slope.aspect elevation=elevation@PERMANENT slope=pendenza aspect=esposizione

13. Slope & aspect (r.slope.aspect)
r.slope.aspect elevation=elevation@PERMANENT slope=pendenza aspect=esposizione

14. Hydrologic Analysis (r.watershed)
r.watershed elevation=elevation@PERMANENT accumulation=accumuli
drainage=drenaggio streams=fiumi threshold=1000

15. Hydrologic Analysis (r.watershed)
r.watershed elevation=elevation@PERMANENT accumulation=accumuli
drainage=drenaggio streams=fiumi threshold=1000

16. Hydrologic Analysis (r.watershed)
r.watershed elevation=elevation@PERMANENT accumulation=accumuli
drainage=drenaggio streams=fiumi threshold=1000

17. Hydrologic Analysis (r.watershed)
Streams
r.watershed elevation=elevation@PERMANENT accumulation=accumuli
drainage=drenaggio streams=fiumi threshold=1000

18. Hydrologic Analysis (r.watershed)
Drainage
(Flow direction)
r.watershed elevation=elevation@PERMANENT accumulation=accumuli
drainage=drenaggio streams=fiumi threshold=1000

19. Hydrologic Analysis (r.watershed)
Flow
accumulation
r.watershed elevation=elevation@PERMANENT accumulation=accumuli
drainage=drenaggio streams=fiumi threshold=1000

20. Raster to vector map
r.thin input=fiumi output=fiumi_thin

21. Raster to vector map
r.to.vect input=fiumi_thin output=reticolo feature=line

22. Raster to vector map
r.to.vect input=fiumi_thin output=reticolo feature=line

23. Raster to vector map
r.to.vect input=fiumi_thin output=reticolo feature=line

24. Comparison with “real” streams
Layers: Lakes, streams

25. Comparison with “real” streams
Layers: Lakes, streams

26. Comparison with “real” streams
Layers: Lakes, streams, elevation, fiumi

27. Comparison with “real” streams
Layers: Lakes, streams, elevation, fiumi

28. Delimitation of the basin
(r.water.outlet)
r.water.outlet drainage=drenaggio basin=bacino easting=643677.87
northing=222800.246

29. Delimitation of the basin
(r.water.outlet)
r.water.outlet drainage=drenaggio basin=bacino easting=643677.87
northing=222800.246

30. Delimitation of the basin
(r.water.outlet)
r.water.outlet drainage=drenaggio basin=bacino easting=643677.87
northing=222800.246

31. Delimitation of the basin
(r.water.outlet)
r.water.outlet drainage=drenaggio basin=bacino easting=643677.87
northing=222800.246

32. Questions?

33. License of this document
This work is licensed under a Creative Commons License.
http://creativecommons.org/licenses/by­sa/3.0/
2010, Margherita Di Leo, Italy
dileomargherita AT gmail DOT com
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