Wikipedia:Graphics Lab/Resources/QGIS/Create a topographic background: Difference between revisions

Revision as of 13:31, 1 December 2012

Latest revision as of 18:51, 20 November 2021

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:{{done}}— section updated (2012/01)

Copy-paste the following color code in an empty, [[plain text]] document (using something like [[Notepad]] or [[TextEdit]]), then save it in ./QGis/Mapcolors/ as '''Wikicarto_2.0.qml''' (the palette's name + .qml). We will frequently use it later.

{{summarizationCollapse|title=: Colormap "Wikicarto_2.0.qml"|1=<pre>

<!DOCTYPE qgis PUBLIC 'http://mrcc.com/qgis.dtd' 'SYSTEM'>

<qgis version="1.6.0-Copiapo" minimumScale="1" maximumScale="1e+08" hasScaleBasedVisibilityFlag="0">

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;Plugin not in the repository

{{summarizationCollapse|1=

:''This section is about adding a plugin '''not''' available through QGis (1.7) > Plugins > Fetch plugins, and thus to install handily. We take the case of QGis SimpleSVG plugin.''

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:{{done}} - Done, awaiting your testing & feedbacks !

[[File:QGis SimpleSVG 01 - field for items names.png|300px|thumb|Setting to output well coded SVGs.]]

[[File:QGisLocation SimpleSVGmaps-Simple SVG-02 - output bitmap & vector (png).png|right|300px|thumb|What we want is this: a high quality topographic output. With QGis and experience, you can get this in about 5 to 10 minutes.]]

<br />

You are now working with QGis, your GIS data—namely, ETOPO1—and your customized palette. To output your first topographic background, '''don't use ''File > Save as Image'', which is a simple screenshot.''' For better quality, use the ''SimpleSVG plugin''. <!-- This step will walk you through outputting a map like the one you see on the right, including a grid and an inset that lets the viewer know where in the world this section is located. -->

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;Run SimpleSVG plugin (when installed):

:QGIS (1.7) > Plugins > Save as SVG > Save as SVG'' > Choice your folder : a vector file AND a bitmap file are produced.

:In later versions of QGIS (2.18) > Web > Save as SVG > Save as SVG

;Tips

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'''Concept:''' Use an elevation GIS file, a discrete black & white colormap, and the Print composer to output one 1500px/1500px black & white png for each altitude (0m, +200m, +500m, etc, name the png accordingly!). This by a cycle such as 1. editing the map color, 2. actualizing the Print composer, 3. outputting the new png. Then use Inkscape to vectorize : load all png, align them, vectorize each using 2 colors + delete background. Color each vector polygon level (0m, 200m, ...) as need.<br />

;Introduction

QGis can convert raster polygons into vector polygons (''raster > polygonizer''). It does contours too, which have no fill, and so you must use ''vector > geometry > lines to polygons'' in order to fill them up.

;QGis cycles

;Inkscape cycles

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{{Digital cartography tutorials}}

[[ru:Википедия:Проект:Картография/Помощь/Векторная физическая карта]]

[[fr:Wikipédia:Atelier_graphique/Didacticiels_cartographiques/Didacticiel_de_création_de_carte_avec_QGIS/Topographie]]