QGIS-2.8-PyQGISDeveloperCookbook-en(15)
时间：2025-03-11
为开发人员准备的文档,涵盖QGIS的多种功能实现和代码。
CHAPTER4
UsingRasterLayers
Thissectionslistsvariousoperationsyoucandowithrasterlayers.
4.1LayerDetails
Arasterlayerconsistsofoneormorerasterbands—itisreferredtoaseithersinglebandormultibandraster.
ualcolorimage(e.g.aerialphoto)isarasterconsistingofred,blueand
greenband.Singlebandlayerstypicallyrepresenteithercontinuousvariables(e.g.elevation)ordiscretevariables
(nduse).Insomecases,arasterlayercomeswithapaletteandrastervaluesrefertocolorsstoredinthe
palette:
4.2DrawingStyle
Whenarasterlayerisloaded,itgetsadefaultdrawingstylebasedonitstype.Itcanbealteredeitherinraster
layerpropertiesorprogrammatically.Thefollowingdrawingstylesexist:
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