Web1 条答案. 在R中加载多多边形，确保它有一个合适的坐标系，然后使用 st_area () ，它返回多多边形中每个多边形（行）的面积。. # Group by NAME and calculate a total area for each group. # We expect this to return one area value, because there is only one group. # Now group by the dummy variable and ... WebMay 2, 2024 · Hard assignment of CRS was the trick. st_crs (my downloaded object) <- 4326 this ensures that the downloaded object has the locally understood wording of WGS84. Risky with objects of unknown origin, but works for me in my use case. – Jindra Lacko Oct 31, 2024 at 8:26 Add a comment 0
r - Convert sf object to dataframe and restore it to original state
WebendCapStyle将仅在GEOS设置中工作=它与{s2}世界的球形操作不兼容。您可以完全关闭{s2}处理，或重新投影到平面CRS。 Web15.1 Brief introduction to sf; 15.2 About the data; 15.3 Exploring the data using plot() and st_crs() 15.3.1 Coordinate Reference System (CRS) 15.4 sf & the Tidyverse. 15.4.1 select() 15.4.2 filter() 15.5 Spatial Joins. 15.5.1 Visualize with ggplot; 15.6 Incorporate base maps into static maps using ggmap; 15.7 Visualize sf objects with leaflet ... easiest way to print out text messages
3. Manipulating Simple Feature Geometries • sf
WebArguments x. object of class sfg, sfc or crs. modifiers; in particular digits can be passed to control the number of digits used. projjson. logical; if TRUE, return projjson form (requires GDAL 3.1 and PROJ 6.2), else return well-known-text form WebJan 5, 2014 · We’ll use the st_area function from sf which will revert to geodesic area calculation if a lat/long coordinate system is present. tissot.sf <- st_sf( geoArea = st_area(tissot.sfc), tissot.sfc ) The true area of the circles should be π∗r2 π ∗ r 2 or 2.8274334^ {11} square meters in our example. WebThe GeoJSON specification states that polygons are oriented using the Right-Hand Rule, … easiest way to produce oil from marijuana