Dear community, I am learning some basic geometry operation functions of sf package including st_buffer().
It seems there should be no wonder if I provide a negative value to the dist argument in st_buffer(), I should expect an inward/shrinking buffer zone (I also followed here: https://gis.stackexchange.com/questions/392505/can-i-use-r-to-do-a-buffer-inside-polygons-shrink-polygons-negative-buffer). However, it turn out to be as long as I provide a negative value, the output will be an empty geometry: library(sf) library(spDataLarge) st_geometry(bristol_zones[1, ]) -> a # a is the exemplary data set > a Geometry set for 1 feature Geometry type: MULTIPOLYGON Dimension: XY Bounding box: xmin: -2.534502 ymin: 51.40487 xmax: -2.488435 ymax: 51.43478 Geodetic CRS: WGS 84 MULTIPOLYGON (((-2.510462 51.42878, -2.507985 5... > st_buffer(a, 100) Geometry set for 1 feature Geometry type: POLYGON Dimension: XY Bounding box: xmin: -2.536248 ymin: 51.40393 xmax: -2.486907 ymax: 51.43598 Geodetic CRS: WGS 84 POLYGON ((-2.517834 51.43188, -2.518218 51.4318... > st_buffer(a, -100) Geometry set for 1 feature (with 1 geometry empty) Geometry type: POLYGON Dimension: XY Bounding box: xmin: NA ymin: NA xmax: NA ymax: NA Geodetic CRS: WGS 84 POLYGON EMPTY So I would like to know if it is possible to create inward buffer zones with st_buffer()? If st_buffer() is not designed to perform this, what is the best alternative? Thank you, and have a great start of the week! $B3pfF(B YE, Xiang THINKING SPATIALLY<http://www.linkedin.com/in/spatialyexiang>. Ph.D. in Spatial Statistics [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo