Questions tagged [predicates]

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geopandas.sjoin : Does the size of the polygon matters?

I am doing a spatial join with geopandas as follows: joinIlots = gpd.sjoin(left_df=Area, right_df=data, how="left", predicate="intersects") The geodataframe data represents ...
bravopapa's user avatar
  • 475
5 votes
1 answer
174 views

Identifying lines that enter a polygon but don't cross it entirely

I need a method to differentiate the two scenarios below where a line only enters a polygon and another where a line enters and leaves the polygon, crossing it entirely. On QGIS I tried using the ...
Nandula's user avatar
  • 781
6 votes
3 answers
1k views

Multipolygon supposed to be contained by another but returned False with Shapely

There are two multi-polygons a and A where a is supposed to be contained inside A. Using shapely, the following difference operator b = a.difference(A) print(b) gives POLYGON EMPTY However testing A....
Pateheo's user avatar
  • 265
1 vote
2 answers
381 views

R and sf Binary Predicates

Am trying to dial-down into the definitions and cannot resolve or understand the argument named, "prepared". The definition of prepared is: "logical; prepare geometry for x, before ...
Gray's user avatar
  • 151
-2 votes
1 answer
52 views

Seeking offline predicted travel time service, package or software? [closed]

I am looking for a service/package/sw that will return the predicted travel time (not real time) between two points and the departure day and time. The predicted travel time must take into account the ...
Lior Cohen's user avatar
5 votes
1 answer
8k views

How to efficiently determine which of thousands of polygons intersect with a linestring [duplicate]

I have a shapefile that contains several thousand Polygons/MultiPolygons and another shapefile that has a variable number of LineStrings. In the example below the blue Polygons are those that ...
derNincompoop's user avatar
3 votes
3 answers
703 views

How to find the "first" intersection of a line with anything else

I am trying to find the first intersection of a line with anything else. By first intersection I mean the first intersection, if you follow the line in its direction from start to end. Check the ...
bugmenot123's user avatar
  • 11.2k