When to use spatial clipping in GeoComputation?
Spatial clipping is a form of spatial subsetting that involves changes to the geometry columns of at least some of the affected features. Clipping can only apply to features more complex than points: lines, polygons and their ‘multi’ equivalents.
How is a multigeometry constructed in Google Earth?
Constructs a MultiGeometry from the given list of geometry elements. The list of geometries for the MultiGeometry. The coordinate reference system of the coordinates. The default is the projection of the inputs, where Numbers are assumed to be EPSG:4326. If false, edges are straight in the projection.
How are aligned Raster objects processed in geocomputation?
Aligned raster objects share a one-to-one correspondence between pixels, allowing them to be processed using map algebra operations, described in Section 4.3.2. The final Section 5.4 connects vector and raster objects. It shows how raster values can be ‘masked’ and ‘extracted’ by vector geometries.
Which is the result of a WGS84 rectangle?
Obsolete; has no effect. Constructs a rectangle whose edges are lines of latitude and longitude. The result is a planar WGS84 rectangle. If (east – west) ≥ 360 then the longitude range will be normalized to -180 to +180; otherwise they will be treated as designating points on a circle (e.g. east may be numerically less than west).
How are centroid operations used in geocomputation with R?
FIGURE 5.2: Polygon simplification in action, comparing the original geometry of the contiguous United States with simplified versions, generated with functions from sf (center) and rmapshaper (right) packages. Centroid operations identify the center of geographic objects.
How are binary transformations used in GeoComputation with R?
Binary transformations modify one geometry based on the shape of another. This includes clipping and geometry unions, covered in Sections 5.2.5 and 5.2.6, respectively. Type transformations (from a polygon to a line, for example) are demonstrated in Section 5.2.7.