Introduzione all'uso di GRASS GISper la modellazione idrologica

Ing. Margherita Di Leo

Potenza, 17 Dicembre 2010Master PROIDRO - Corso di Modellazione Idrologica

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

Organization of data

GRASS DATA SET GRASSDATA

LOCATION

MAPSET

UTM33WGS84 UTM33ED50Gauss-

BoagaRoma40FusoEst

PERMANENT PERMANENT PERMANENT

USER1 USER2 USER1 USER1

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

GUI (graphical user interface)

Path toGRASS data set

Location

Mapset

Start

GUI (graphical user interface)

Map Display

Layer Manager

Terminal

Map Layers

Command console

Search module

GUI (graphical user interface)

Layer Manager

Map LayersCommand console

Search module

Current region (g.region -p)

Set region (g.region)

g.region rast=elevation@PERMANENT -p

VisualizationAdd raster layerDisplay

Zoom

Query

Coords

Layer

Add raster layer

Show attribute table

Slope & aspect (r.slope.aspect)

r.slope.aspect elevation=elevation@PERMANENT slope=pendenza aspect=esposizione

Slope & aspect (r.slope.aspect)

r.slope.aspect elevation=elevation@PERMANENT slope=pendenza aspect=esposizione

Slope & aspect (r.slope.aspect)

r.slope.aspect elevation=elevation@PERMANENT slope=pendenza aspect=esposizione

Hydrologic Analysis (r.watershed)

r.watershed elevation=elevation@PERMANENT accumulation=accumuli drainage=drenaggio streams=fiumi threshold=1000

r.watershed elevation=elevation@PERMANENT accumulation=accumuli drainage=drenaggio streams=fiumi threshold=1000

Hydrologic Analysis (r.watershed)

r.watershed elevation=elevation@PERMANENT accumulation=accumuli drainage=drenaggio streams=fiumi threshold=1000

Hydrologic Analysis (r.watershed)

r.watershed elevation=elevation@PERMANENT accumulation=accumuli drainage=drenaggio streams=fiumi threshold=1000

Hydrologic Analysis (r.watershed)

Streams

r.watershed elevation=elevation@PERMANENT accumulation=accumuli drainage=drenaggio streams=fiumi threshold=1000

Hydrologic Analysis (r.watershed)

Drainage (Flow direction)

r.watershed elevation=elevation@PERMANENT accumulation=accumuli drainage=drenaggio streams=fiumi threshold=1000

Hydrologic Analysis (r.watershed)

Flow accumulation

r.thin input=fiumi output=fiumi_thin

Raster to vector map

r.to.vect input=fiumi_thin output=reticolo feature=line

Raster to vector map

r.to.vect input=fiumi_thin output=reticolo feature=line

Raster to vector map

r.to.vect input=fiumi_thin output=reticolo feature=line

Raster to vector map

Comparison with “real” streams

Layers: Lakes, streams

Comparison with “real” streams

Layers: Lakes, streams

Comparison with “real” streams

Layers: Lakes, streams, elevation, fiumi

Comparison with “real” streams

Layers: Lakes, streams, elevation, fiumi

Delimitation of the basin (r.water.outlet)

r.water.outlet drainage=drenaggio basin=bacino easting=643677.87 northing=222800.246

Delimitation of the basin (r.water.outlet)

r.water.outlet drainage=drenaggio basin=bacino easting=643677.87 northing=222800.246

Delimitation of the basin (r.water.outlet)

r.water.outlet drainage=drenaggio basin=bacino easting=643677.87 northing=222800.246

Delimitation of the basin (r.water.outlet)

r.water.outlet drainage=drenaggio basin=bacino easting=643677.87 northing=222800.246

Questions?

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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