Wikipedia:Graphics Lab/Resources/QGIS/Get ready: Difference between revisions
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If you would like a more comprehensive overview of QGis and its functions, you can read the [http://qgis.org/en/documentation/manuals.html official User Guide], available in several languages.
=Step 0.1: Get the tools=
==Install QGis==
Find your operating system from the list below and follow the link to the appropriate installer. Please don't install the sample data sets (North Carolina, etc.); you will be downloading more complete data later.
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While QGis will allow you to open many GIS files, we are mainly concerned with '''.[[Tagged Image File Format|tiff]]''' (raster) and '''.[[Shapefile|shp]]''' (vector) files.
{{important|If you encounter any issues, you can browse and ask questions at the [http://forum.qgis.org QGis Forum] ({{green|
==Create some helpful folders==
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*Your QGis projects will be saved in the ''Projects'' folder.
*''Examples''
*''Outputs'' will host the many intermediate outputs you will generate and look at to improve your mapmaking skills, as well as any finished maps you create.
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=Step 0.2: Download the GIS data=
{{See also|Wikipedia:Graphic_Lab/Resources/Gis_sources_and_palettes{{!}}/GIS sources & palettes (English)||:fr:Aide:Cartographie/Ressources cartographiques géoréférencées#Sources des données{{!}}French|:de:Hilfe:GMT#Topographische_Datens.C3.A4tze{{!}}German}}
:{{done}}— section updated (2012/02)
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===Topography/bathymetry===
[[file:QGis_ETOPO1_vs_SRTM3_-_quality_match.jpeg|thumb|600px|Quality comparison between ETOPO1 (pixelated) and SRTM3 (smoother) data sets. This difference doesn't matter for making large maps with coverage greater than 1000km (~620mi) across.]]
* {{
* {{
{{
Formerly,
# '''Know''' the coordinates of the area you want to map—although you do have the option of visually selecting the area on the download page.
# '''Find''' the associated GIS files (also called '''tiles'''). SRTM files have names such as "N22E112.hgt.zip", standing for 22⁰ North, 112⁰ East.
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===Other GIS data===
;Provinces:
* {{
|url_doc=http://www.naturalearthdata.com/downloads/10m-cultural-vectors/10m-admin-1-states-provinces/ |layers=major rivers lines |precision_max= |covered_area=whole earth |datum=WSG84 |projection =Geographic projection(?<!-- what that ? source : http://www.naturalearthdata.com/features/ -->) |extensions=.zip →.shp |size_compressed=14Mb |size_uncompressed=19Mb |tile_size=whole Earth |tiles_total=1 |comment = <u>For ___location maps</u>, large and local, and complex maps (political, military, history).|editor_note= }}
;Others existing
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To see our selection, go to the /Gis_sources_and_palettes subpage.
=Step 0.3: Load a GIS file
[[Image:QGis tutorial - layers toolbar.png|thumb|right|super|450px|1. Add Vector Layer, 2. Add Raster Layer, 3. Remove Layer(s)]]
Loading a GIS file adds the data into your project as a [[Layers (digital image editing)| layer]]. For our purposes, we care about '''vector layers and raster layers'''. There are three ways you can add layers into your project: using the menu, using the keyboard shortcuts, or using the toolbar icons.
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Since the ETOPO1 data is a raster file, go ahead and add it to your project using whichever ''Add Raster Layer'' method you prefer.
<div class="center">
<gallery widths="500px" heights="300px">
file:QGis_Data_load_-_01_raster_topography.png |1. Adding a raster layer.
file:QGis_Data_load_-_02_raster_topography.png |2. Topographical data will appear in grey.
</gallery>
</
=Links=
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