INTRODUZIONE A MAPNIK Luca Delucchi OSMit 2009 Mapnik un software - - PowerPoint PPT Presentation

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INTRODUZIONE A MAPNIK Luca Delucchi OSMit 2009 Mapnik un software - - PowerPoint PPT Presentation

Nov 21, 2023 36 likes •237 views

INTRODUZIONE A MAPNIK Luca Delucchi OSMit 2009 Mapnik un software libero per la rappresentazione di dati geografici Permette la realizzazione di immagini singole oppure di tile per la pubblicazione sul web Multipiattaforma Linux - Mac OS

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Luca Delucchi OSMit 2009

INTRODUZIONE A MAPNIK

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Mapnik è un software libero per la rappresentazione di dati geografici Permette la realizzazione di immagini singole oppure di tile per la pubblicazione sul web

Luca Delucchi OSMit 2009

Multipiattaforma Linux - Mac OS X - Windows

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Scritto in C++ con python bindings che facilitano l'utilizzo Utilizza standard OGC, librerie GDAL/OGR, proj, agg e cairo

Luca Delucchi OSMit 2009

Utilizza l'algoritmo di Painter per determinare l'ordine degli elementi

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Utilizzo Script per il rendering:

  • per le immagini
  • per le tile

Regole per gli stili:

  • file XML
  • python
  • c++

Luca Delucchi OSMit 2009

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Stampa: png

#!/usr/bin/python from mapnik import * import cairo mapfile = "progetto.xml" map_output= 'prova_dim.png' m = Map(1192, 840) projection = '+proj=latlong +datum=WGS84' load_map(m, mapfile) bbox = Envelope(Coord(9.04311180114746, 45.7490234375), Coord(12.0447950363159, 47.1829261779785)) m.zoom_to_box(bbox) render_to_file(m, map_output, 'png')

Luca Delucchi OSMit 2009

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Stampa: png

#!/usr/bin/python from mapnik import * import cairo mapfile = 'progetto.xml' map_output = 'mapfile.pdf' projection = '+proj=latlong +datum=WGS84' m = Map(1192, 840) load_map(m, mapfile) bbox = Envelope(9.470383644104, 43.2393798828125, 12.4720678329468, 44.673282623291) mapnik_map.zoom_to_box(bbox) file = open(map_output, 'wb') surface = cairo.PDFSurface(file.name, m.width, m.height) render(m, surface) surface.finish()

Luca Delucchi OSMit 2009

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<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE Map> <Map bgcolor="#b5d0d0" srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs +over"> ................................................................................................. ................................................................................................. ................................................................................................. </Map>

File XML: map

Luca Delucchi OSMit 2009

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File XML: raster layer

<Layer name="dem" status="on"> <StyleName>raster</StyleName> <Datasource> <Parameter name="type">gdal</Parameter> <Parameter name="file">/path/al/file/</Parameter> <Parameter name="format">tiff</Parameter> </Datasource> </Layer> <Datasource> <Parameter name="type">raster</Parameter> <Parameter name="file">/path/file.tiff</Parameter> <Parameter name="format">tiff</Parameter> <Parameter name="lox">5.0</Parameter> <Parameter name="loy">35.0</Parameter> <Parameter name="hix">20.0</Parameter> <Parameter name="hiy">50.0</Parameter> </Datasource>

Luca Delucchi OSMit 2009

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File XML: postgis layer

<Layer name="misc_boundaries" status="on" srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs +over"> <StyleName>boundary</StyleName> <Datasource> <Parameter name="type">postgis</Parameter> <Parameter name="user">utente</Parameter> <Parameter name="dbname">italy</Parameter> <Parameter name="password">****</Parameter> <Parameter name="table">(select * from italy_line) as road </Parameter> <Parameter name="estimate_extent">...</Parameter> <Parameter name="extent">833337,5432307, 1119564,5572109</Parameter> </Datasource> </Layer>

Luca Delucchi OSMit 2009

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File XML: shape layer

<Layer name="coast-poly" status="on" srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs +over"> <StyleName>coast-poly</StyleName> <Datasource> <Parameter name="type">shape</Parameter> <Parameter name="file">/path/al/file/</Parameter> </Datasource> </Layer>

Luca Delucchi OSMit 2009

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<Style name="amenity"> <Rule> <Filter>[tourism]='viewpoint'</Filter> <PointSymbolizer file="/path/file" type="png" width="16" height="16" allow_overlap="true"/> </Rule> </Style>

File XML: point style

Luca Delucchi OSMit 2009

<Style name="amenity"> <Rule> <Filter>[tourism]='viewpoint'</Filter> <PointSymbolizer width="16" height="16"

  • pacity=”0.5” allow_overlap="true"/>

</Rule> </Style>

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<Style> <Rule> <Filter>[highway] = 'motorway'</Filter> <LineSymbolizer> <CssParameter name="stroke"> #666666</CssParameter> <CssParameter name="stroke-width"> 5</CssParameter> <CssParameter name="stroke-dasharray"> 8 - 3</CssParameter> <CssParameter name="stroke-linejoin"> round</CssParameter> <CssParameter name="stroke-opacity"> 0.7</CssParameter> </LineSymbolizer> </Rule> </Style>

File XML: line style

Luca Delucchi OSMit 2009

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File XML: line style

Luca Delucchi OSMit 2009

<Style name="aerialways"> <Rule> <Filter>[aerialway] = 'cable_car'</Filter> <LinePatternSymbolizer width="16" height="16" type="png" file="/path/to/icon.png"/> </Rule> </Style>

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<Style name="world"> <Rule> <Filter>[na2] = 'IT'</Filter> <PolygonSymbolizer> <CssParameter name="fill">white</CssParameter> <CssParameter name="fill-opacity"> 0.8</CssParameter> </PolygonSymbolizer> </Rule> </Style>

File XML: polygon style

Luca Delucchi OSMit 2009

<Style name="world"> <Rule> <Filter>[na2] = 'IT'</Filter> <PolygonPatternSymbolizer width="16" height="16" type="png" file="/path/to/icon.png"/> </Rule> </Style>

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File XML: building style

Luca Delucchi OSMit 2009

<Style name=”building”> <BuildingSymbolizer> <CssParameter name="fill">#000000</CssParameter> <CssParameter name="fill-opacity">1</CssParameter> <CssParameter name="height">8</CssParameter> </BuildingSymbolizer> </Style>

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<Style name="autostrade_name"> <Rule> <Filter>[highway] = 'motorway'</Filter> <ShieldSymbolizer name="ref" face_name="DejaVu Sans Bold" size="7" fill="#000000" placement="line" file="/path/file" type="png" width="17" height="17" spacing="100" min_distance="150"/> </Rule> </Style> <Style> <Rule> <Filter>[popolazione] &gt;= 100000</Filter> <TextSymbolizer name="toponimo" face_name= "DejaVu Sans Book" size="15" fill="#000000" halo_radius="2" allow_overlap="true"/> </Rule> </Style>

File XML: text & shield style

Luca Delucchi OSMit 2009

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<Style name="autostrade_name"> <Rule> <Filter>[highway] = 'motorway'</Filter> <MaxScaleDenominator>10000000 </MaxScaleDenominator> <MinScaleDenominator>2000000 </MinScaleDenominator> <ShieldSymbolizer name="ref" face_name="DejaVu Sans Bold" size="7" fill="#000000" placement="line" file="/path/file" type="png" width="17" height="17" spacing="100" min_distance="150"/> </Rule> </Style>

File XML: scaledenom style

Luca Delucchi OSMit 2009

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File XML: filter style

Luca Delucchi OSMit 2009

<Filter>[highway] = 'primary'</Filter> <Filter>[popolazione] &gt;= 30000 and [popolazione] &lt; 100000</Filter> <Filter>([highway] = 'primary' or [highway] = 'primary_link'

  • r [highway] = 'trunk' or [highway] = 'trunk_link') and not

([tunnel] = 'yes' or [tunnel] = 'true' or [tunnel] = '1')</Filter>

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<Style name="raster"> <Rule> <RasterSymbolizer> </RasterSymbolizer> </Rule> </Style>

File XML: raster style

Luca Delucchi OSMit 2009

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Luca Delucchi OSMit 2009

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