May 18, 2017
PostGIS clustering
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PostGIS clustering
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italia mapnik 13 zip
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italia mapnik 13 zip
italia mapnik 13 zip
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Mapnik: Surely a Mapping Toolkit to use
Mapnik[http://mapnik.org]
Mapnik is a Free Toolkit for developing mapping applications. It’s written in C++ and there are Python bindings to facilitate fast-paced agile development. It can comfortably be used for both desktop and web development, which was something I wanted from the beginning.
Mapnik is about making beautiful maps. It uses the AGG library and offers world class anti-aliasing rendering with subpixel accuracy for geographic data. It is written from scratch in modern C++ and doesn’t suffer from design decisions made a decade ago. When it comes to handling common software tasks such as memory management, filesystem access, regular expressions, parsing and so on, Mapnik doesn’t re-invent the wheel, but utilizes best of breed industry standard libraries from boost.org
A little more Mapnik work for the week: Aaron Huslage and Roger Weeks of Tethr asked about a map stylesheet for OSM data that could generate maximally-compressed tiles to fit onto a portable GIS / disaster response system they’re prototyping.
OSM Solar is a response to that requirement, and generates tiles that in many cases are 30%-40% the size of their OSM Mapnik counterparts. The job is mostly accomplished through drastic color reduction to a 4-bit (16 color) palette and aggressive pruning of details: parks are named but not filled, buildings are just barely visible for minimal context, color transitions and road casings are avoided.
draw map with mapnik
Drawing map is so lovely if we do in python.
This is the mapnik xml that I generated from QuantumGIS
<?xml version="1.0" ?> <Map bgcolor="rgb(255,255,255)" srs="+proj=utm +zone=48 +south +ellps=WGS84 +datum=WGS84 +units=m +no_defs"> <Style name="Bangunan_style"> <Rule> <PolygonSymbolizer> <CssParameter name="fill">rgb(144,52,45)</CssParameter> <CssParameter name="gamma">0.7</CssParameter> </PolygonSymbolizer> <LineSymbolizer> <CssParameter name="stroke-width">0.96</CssParameter> </LineSymbolizer> </Rule> </Style> <Style name="Jalan_style"> <Rule> <LineSymbolizer> <CssParameter name="stroke">rgb(255,0,0)</CssParameter> <CssParameter name="stroke-width">0.96</CssParameter> <CssParameter name="stroke-linejoin">bevel</CssParameter> <CssParameter name="stroke-linecap">square</CssParameter> </LineSymbolizer> </Rule> </Style> <Style name="Sungai_style"> <Rule> <LineSymbolizer> <CssParameter name="stroke">rgb(70,130,180)</CssParameter> <CssParameter name="stroke-width">0.96</CssParameter> <CssParameter name="stroke-linejoin">bevel</CssParameter> <CssParameter name="stroke-linecap">square</CssParameter> </LineSymbolizer> </Rule> </Style> <Style name="kelurahan_style"> <Rule> <PolygonSymbolizer> <CssParameter name="fill">rgb(157,245,92)</CssParameter> <CssParameter name="gamma">0.7</CssParameter> </PolygonSymbolizer> <LineSymbolizer> <CssParameter name="stroke-width">0.96</CssParameter> </LineSymbolizer> </Rule> </Style> <Layer name="kelurahan" srs="+proj=utm +zone=48 +south +ellps=WGS84 +datum=WGS84 +units=m +no_defs"> <StyleName>kelurahan_style</StyleName> <Datasource> <Parameter name="file">bdg_barat/kelurahan.TAB</Parameter> <Parameter name="layer">kelurahan</Parameter> <Parameter name="multiple_geometries">0</Parameter> <Parameter name="type">ogr</Parameter> </Datasource> </Layer> <Layer name="Sungai" srs="+proj=utm +zone=48 +south +ellps=WGS84 +datum=WGS84 +units=m +no_defs"> <StyleName>Sungai_style</StyleName> <Datasource> <Parameter name="file">bdg_barat/Sungai.TAB</Parameter> <Parameter name="layer">Sungai</Parameter> <Parameter name="multiple_geometries">0</Parameter> <Parameter name="type">ogr</Parameter> </Datasource> </Layer> <Layer name="Jalan" srs="+proj=utm +zone=48 +south +ellps=WGS84 +datum=WGS84 +units=m +no_defs"> <StyleName>Jalan_style</StyleName> <Datasource> <Parameter name="file">bdg_barat/Jalan.TAB</Parameter> <Parameter name="layer">Jalan</Parameter> <Parameter name="multiple_geometries">0</Parameter> <Parameter name="type">ogr</Parameter> </Datasource> </Layer> <Layer name="Bangunan" srs="+proj=utm +zone=48 +south +ellps=WGS84 +datum=WGS84 +units=m +no_defs"> <StyleName>Bangunan_style</StyleName> <Datasource> <Parameter name="file">bdg_barat/Bangunan.TAB</Parameter> <Parameter name="layer">Bangunan</Parameter> <Parameter name="multiple_geometries">0</Parameter> <Parameter name="type">ogr</Parameter> </Datasource> </Layer> </Map>
the hardest thing to get the map is find the right coordinate so it could rendered properly so it's better if we generated it from the background layer coordinate. I change
map.zoom_to_box(mapnik.Envelope(778614, 9240464, 790014, 9230968))
to
map.zoom_to_box(layer0.envelope())
now we can get the map automatically without confused with the number
import mapnik map = mapnik.Map(800, 400) mapnik.load_map(map, "bandungbarat.xml") layer0 = map.layers[0] map.zoom_to_box(layer0.envelope())
mapnik.render_to_file(map, "bandungbarat.png")
and this is the result.