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1. Add a Vector layer, 2. Add a Raster layer, 3. Remove Layer(s). Import files using the buttons described below. Each layer imported into QGIS contains a data type (points, lines, polygons). Note: a OpenStreetMap (specific button) extension .osm corresponds to three layers (points, lines, polygons)..
QGis can import GIS data—high quality topographic backgrounds, shaded reliefs, and administrative regions or borders—and apply styles to them. Map with imported GIS data: . NASA's topographic background, .
To use the QGis palettes, simply copy-paste the code into a text document, then save as PALETTENAME.qml. Then, in QGis and while working on a layer : QGis > Layer > Properties > Load a style > [browse, select the .qml file, load] > Apply. It is advised to create a specific '/Mapcolors' folder to store these .qml files.
To give a smooth, gradient-like appearance to the colors, go to Layer > Properties > Colormap > Color interpolation (at the top), and set it to Linear. By default, the canvas of QGIS (geographic area visible in QGis) will become the area of interest for print composer. Open the Print composer: QGIS (1.7)> File > New Print Composer (Ctrl + P).
QGIS functions as geographic information system (GIS) software, allowing users to analyze and edit spatial information, in addition to composing and exporting graphical maps. [2] QGIS supports raster, vector, mesh, and point cloud layers. [4] Vector data is stored as either point, line, or polygon features.
Vector overlay is an operation (or class of operations) in a geographic information system (GIS) for integrating two or more vector spatial data sets. Terms such as polygon overlay, map overlay, and topological overlay are often used synonymously, although they are not identical in the range of operations they include.
QGIS display your data using the projection you tell it to use. By default, the lat/long projection (= Equirectangular projection , example aside) is used, code: WGS84 lat/lon (EPSG:4326) . This projection is the most convenient for georeferencing, but imply strong distortions at polar latitudes.
The vast majority of modern cartography is done with the help of computers, usually using GIS but production of quality cartography is also achieved by importing layers into a design program to refine it. Most GIS software gives the user substantial control over the appearance of the data. Cartographic work serves two major functions: