Skip to content

lib/vector: improve numerical stability for point-in-polygon calculations #7333

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
metzm wants to merge 2 commits into
base: main
Choose a base branch
from
+224 −126
Open

lib/vector: improve numerical stability for point-in-polygon calculations #7333

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
45d930c
improve numerical stability for point-in-polygon
metzm Apr 18, 2026
ca061ca
improve intersection calculation
metzm Apr 19, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
4 changes: 3 additions & 1 deletion lib/vector/Vlib/find.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -324,7 +324,9 @@ int Vect_find_area(struct Map_info *Map, double x, double y)
G_debug(3, " area = %d Vect_point_in_area_outer_ring() = %d", area,
ret);

if (ret >= 1) {
/* the point must be really inside (ret = 1), not on the boundary (ret =
* 2) */
if (ret == 1) {
/* check if in islands */
Area = Plus->Area[area];
for (j = 0; j < Area->n_isles; j++) {
Expand Down
Loading
Loading