9/8/2023 0 Comments Vector raster conversionIf FALSE (default) then start a new GRASS session and import the raster named in rast. This usually fails, or if it succeeds, takes several minutes. If this is NULL, R will search for the directory in which GRASS is installed. Example: 'C:/Program Files/GRASS GIS 7.8'. Name of the directory in which GRASS is installed. Default is FALSE.Ĭharacter or NULL (default). This option only applies if vectType is area. If TRUE then "round" cell corners by connecting the midpoints of corner cells (which leaves out the corner-most triangle of that cell). Using this option will merge cells with the same value (even if they are not spatially adjacent one another). For example, if the raster is vectorized into a polygons object each cell will become a separate polygon. If TRUE (default) then union all points/lines/polygons with the same value into the same "multipart" polygon. Indicates type of output: point, line (not supported yet), or area. It can convert a raster to points or polygons (conversion to lines is not yet supported, although it is possible using the r.to.vect module in GRASS).Įither a raster or the name of a raster in an existing GRASS session.Ĭharacter. This function is a potentially faster version of the function rasterToPolygons in the raster package. workerFocal: Initialize GRASS session and import raster and/or vector(s).Ĭonvert a raster to a vector (points, lines, or polygons) Description.madRivers: Spatial data: major rivers in a selected portion of.madForest2000: Spatial data: forest cover in 2000 for a portion of.madElev: Spatial data: digital elevation model (DEM) of a portion of.mad4: Spatial data: borders of selected districts of Madagascar.mad0: Spatial data: national borders of Madagascar.initGrass: Initialize GRASS session and import raster and/or vector(s).fragmentation: Calculate fragmentation indices for a raster.fasterVectToRastDistance: Distance between raster cells and nearest spatial point.fasterVectorize: Convert a raster to a vector (points, lines, or polygons).fasterTopidx: Generate topographic wetness index raster.fasterTerrain: Calculate raster slope, aspect, curvature, and partial.fasterSurfFractal: Generate a raster with a fractal pattern.fasterSun: Calculate solar radiance and irradiation.fasterRasterize: Rasterize using a call to GRASS GIS.fasterRaster: fasterRaster: Faster raster processing in R using GRASS GIS.fasterRastDistance: Distance distance between cells with 'NA's and closest.fasterQuantile: Compute quantiles for a raster.fasterProjectRaster: Project and resample a raster.fasterMapcalc: User-defined calculations on a single raster.fasterLongLatRasters: Calculate longitude and latitude rasters.fasterHorizon: Calculate horizon angle height raster.fasterFragmentation: Calculate fragmentation indices for a raster.fasterFocal: Multi-core version of the focal() function.fasterConvertDegree: Convert degrees between cases with 0 = north and 0 = east.fasterContour: Calculate contour vectors from a raster.fasterCalc: Apply a formula to each cell of a raster.fasterBufferRast: Add a buffer to a raster.faster: Generic function to call a GRASS module.exportVectToGrass: Write vector to an existing GRASS session.exportRastToGrass: Write raster to an existing GRASS session.dot-getCores: Calculate number of cores to use for multi-core functions.dot-fragDensity: Calculate density (pf, or proportion of cells occupied) from.dot-fragConnect: Calculate pff (connectivity between cells) of a binary matrix.dot-fragClassify: Classify fragmentation from density (pf) and connectivity.The same is not true for raster images, since the color information of these images is stretched when scaled. That means images don't lose quality when they're scaled up or down, since the color polygons in a vector image will always maintain their shape. The geometry which comprises vector images is formulaic, making them resolution-independent. Since vector images use dynamic color sections instead of static squares, they provide perfect lines and crisp colors. Vector graphics convey color using scalable color polygons. Raster images use square pixels (bits of color) to convey an image. Most images found online are raster images. What Is a Vector Image?Ī vector image is a scalable image made up of values rather than pixels. Here's how to convert an image to a vector using Adobe Illustrator. It's a quick and simple process and produces excellent results. When you've got a raster graphic that's too small for your needs, the solution is to convert the image to a vector, and you can do this in Adobe Illustrator. They're usually less detailed, but you can make them as big as you like without losing anything. A vector image is made from lines and shapes.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |