P-robot - 4 months ago 54

Python Question

I would like to subset a geopandas dataframe based upon values of the first coordinate of a column of points (i.e. the x values).

`import geopandas as gpd`

from shapely.geometry import Point

gdf = gpd.GeoDataFrame([Point((0,0)), Point((4,2)),Point((2,4))])

gdf.columns = ['points']

So, given the above data, I would like to check if the first coordinate is greater than 3 (for instance) so this would return an array of

`[False, True, False]`

Answer

To check if the x coordinate is greater than 3 you can use `apply`

to extract the coordinate from the points:

```
gdf[gdf.points.apply(lambda p: p.x) > 3]
```