Questions tagged [geopandas]
GeoPandas is an open source project to make working with geospatial data in python easier.
411
questions
1
vote
1answer
180 views
Performing sjoin on polygons and lines without intersection using GeoPandas?
I want to join a GeoDataFrame with Polygons (circular, were created from Points with buffer) with a GeoDataFrame that has Linestrings.
These polygons and lines do not necessarily intersect nor ...
0
votes
1answer
70 views
Testing intersection between shapely object and geopandas GeoSeries?
This is a Python question, involving geopandas and the libraries it calls, primarily pandas and shapely.
tl;dr:
I am trying to run a test using
if foo.intersects(bar): and am repeatedly getting one ...
3
votes
1answer
77 views
Re-project GeoJSON from pixel-space to lat-long in Python
I have created a GeoJSON of linestrings in pixel space using Python. However, I now need to re-project the file to match the same projections and extent of the .tiff file I wish to layer the GeoJSON ...
1
vote
1answer
41 views
GeoPandas does not identify points inside polygon
I am trying to intersect some points with a polygon in GeoPandas.
First I create a Point GeoDataFrame from a text file.
import geopandas as gp
import numpy as np
import pandas as pd
from shapely....
0
votes
0answers
45 views
Opening geodata in GeoPandas?
I've downloaded some geodata but I'm unable to import it into GeoPandas.
This is a sample of the geodata (I've trimmed the JSON object):
{'displayFieldName': 'NAME',
'fieldAliases': {},
'...
3
votes
1answer
218 views
Rasterizing polygon grid in Python (geopandas & rasterio)
I am trying to rasterize a custom polygon grid with one or more columns. Preferably I'd like to create multi-band rasters from multiple GeoDataFrame columns (in polygon grid), but I have got stuck ...
0
votes
0answers
60 views
TypeError: object of type 'Polygon' has no len() - When trying to plot from a Dataframe
I need to create a LISA map for my work, and I am having problem when I'm trying to plot using geopandas.
My data sources are:
map_df # A Dataframe
A geopandas series :
hh = map_df.loc[(map_df['...
1
vote
0answers
150 views
Changing CRS of geometry in geopandas dataframe efficiently?
I have a shapefile which I am converting into a geopandas dataframe. The CRS of this shapefile is epsg:4326 and I want to convert this to epsg:3857.
import geopandas as gp
file_path = 'zip_poly.shp'
...
2
votes
1answer
70 views
Changing CRS in GeoPandas?
I'm trying to plot a bunch of points on a map of Britain and Ireland, and I've been using GeoPandas for that.
I've basically just been following the tutorials to do that, and slicing a world map with ...
0
votes
0answers
104 views
Geopandas ImportError: DLL load failed (in pyviz tutorial geographic data examples) win7
I'm trying to run the geographic data examples from pyviz tutorial. I'm getting the error list in modules below. My Geopandas module work fine (and the others dependent modules) with 3.5 python ...
0
votes
2answers
73 views
Fiona and Geopandas not applying CRS to shapefile during creation
I'm trying to create a shapefile of points from a coordinate list. But, when I use fiona to create the shapefile Arc Catalog is showing that there is no CRS. I tried to add the CRS with Geopandas and ...
1
vote
2answers
126 views
Rounding coordinates to 5 decimals in GeoPandas?
I have a shapefile, which I converted into geopandas dataframe. I would like to round the coordinates to 5 decimals.
Is there a method/function in geopandas that can do this?
My shapefile contains ...
2
votes
0answers
84 views
Python Geopandas reading shapefile taking too long [closed]
I'm relatively new to Python and GIS.
I am attempting to read in a 1.1 GB shapefile using geopandas. I let the code run for an hour and it is still not complete. Is this normal? How can I optimize ...
7
votes
1answer
387 views
Remove empty geometries from geodataframe
Since geopandas can't perform overlay/intersection with lines, I found a workaround:
import geopandas as gpd
import fiona
from shapely.geometry import shape, MultiPolygon, LineString, MultiLineString
...
6
votes
1answer
263 views
Iterating features and buffering using GeoPandas?
I have a shapefile with many large polygons and would like to process each polygon individually because spatial operations on the entire dataset are too big for memory. For instance, iterate shapefile,...
2
votes
2answers
133 views
Plotting lon/lat point (without manual conversion) on XY map using GeoPandas?
I am data scientist not experienced in GIS and need to do some simple map plotting of the Netherlands. Using Geopandas everything works out nice and dandy for my purposes however I am stuck on 1 ...
2
votes
0answers
126 views
Intersecting shapefile/GeoDataFrame using Geopandas, shapely etc?
I'm currently transferring from ESRI to open source GIS by recreating basic ArcGIS tasks in Python, mainly using Geopandas since I have some experience with Pandas.
Now I'm trying to intersect a ...
4
votes
1answer
142 views
Making Shapely box larger using GeoPandas?
I'm creating a box that covers the the area of a GeoPandas GeoDataFrame,
so that I can use it as an inverted map to later cover up unwanted spill-over data.
import geopandas as gpd
import geoplot as ...
1
vote
1answer
169 views
Multiple shapefiles to one GeoPandas GeoDataFrame
I'm trying to vertically concatenate multiple shapefiles that reside in one directory, into one geodataframe. They all have the same table schema and same CRS. I am trying to use the code from this ...
3
votes
1answer
116 views
geopandas.intersects() over each row
In trying to answer Writing selected features to shapefile using OGR and Python? I ran into problems with geopandas.GeoSeries intersects methods.
I have the following line and polygon:
import pandas ...
2
votes
2answers
343 views
How to extract biggest Polygon from MultiPolygon in GeoPandas?
Given a Shapely MultiPolygon, how can I extract the biggest Polygon?
For example, given a MultiPolygon as follows:
from shapely.geometry import Polygon, MultiPolygon
multipolygon = MultiPolygon([...
0
votes
2answers
154 views
How to inverse the orientation of the holes coordinates of a polygon in geopandas
I have a polygon shapefile which I am reading with geopandas. The polygon contains holes. My purpose is to add a random point inside each hole.
In order to create the points inside the holes (...
0
votes
1answer
85 views
Equivalent method for .withcolumn() for geodataframe
I am trying to use a user-defined function in pyspark in order to check whether the points in CANmep_GDF lie within the polygons in gda_GDF.
from geopandas import GeoDataFrame
def check_exist(geom):...
0
votes
0answers
270 views
Smoothing shapefiles using Python
The purple is the original polygon to be smoothed and I would like to smooth the polygons as the red line using Python.
I tried simplify but looks like I need a buffer and simplify the buffer. But I ...
0
votes
0answers
40 views
Locating observations that lies within a collection of Polygons (Python)
I'm trying to locate the observations that lie within a collection of Polygons but my current implementation takes forever, and I suspect that it is because the 'within' method needs to check all ...
0
votes
0answers
52 views
How to preserve the Multiploygons using Python?
I converted my input file with geometry Polygon 25D to an output file with geometry Polygon using the below code.
As you can see the below image. Problem is that the holes in the polygon is vanished ...
0
votes
1answer
392 views
Python geopandas dataframe of polygons — determine nearest neighbor polygon?
I am trying to figure out how to dynamically create expanded regions of interest based on polygon geometries in geopandas until some threshold is satisfied (essentially custom regions across the ...
1
vote
1answer
355 views
Renaming columns using geopandas - issues with data table in Arc
What I'm trying to achieve:
Read in an existing ESRI polygon shapefile
Drop an attribute
Dissolve by another attribute
Rename columns
Reorder columns
Write out as new shapefile
What works: Drop ...
0
votes
0answers
30 views
How can I group the geodataframe on the basis of the column
I have a geodataframe that has a ununique column(text) and polygon geometry for each row.
How can I group the gdf on the basis of the column?
gathering and converting polygons to multipolygon I think ...
0
votes
0answers
100 views
Geopandas Mollweide projection
I´ve a .gpkg file in Mollweide projection. When I open it in geopandas, it shows me the correct crs information:
df1.crs
{'init': 'epsg:54009'}
I´d like to re-project it to EPSG 4326, in a way to ...
0
votes
1answer
186 views
Convert CRS for spatial join for GeoDataFrame
I have the following 2 GeoDataFrame variables in GeoPandas.
# shp.csr
{'init': 'epsg:2953'}
# line.csr
{'proj': 'sterea',
'lat_0': 46.5,
'lon_0': -66.5,
'k': 0.999912,
'x_0': 2500000,
'y_0': ...
0
votes
0answers
80 views
Geodataframe not plotting properly in geopandas
I am playing around with the gdf.plot method which is supposed to facilitate plotting geodataframes using geopandas. The reason is that I would like to avoid jumping from QGIS to python while ...
0
votes
0answers
79 views
Different values between original raster and cropped raster with rasterio.mask
I have a large sentinel-2 image and I want to clip it according polygons which are stored in a geojson file.
My code is:
df = gpd.read_file(os.path.join(geojson_folder,geojson_file))
df.head()
...
1
vote
0answers
340 views
Error in reproject vector file using GeoPandas
I have a vector file (in this case shp file) and I read it with GeoPandas (gpd).
vector_folder = r'C:\poly'
vector_file = 'poly.shp'
df = gpd.read_file(os.path.join(vector_folder,vector_file))
df
...
0
votes
1answer
196 views
Spatial overlays : Union between multiline and multipolygon with geopandas
I try to overlays (apply union) my multipolygon on the multiline with GeoPandas, but it seem like the GeoPandas overlay function work only with (Multi)polygon. Is there any way to make that with ...
1
vote
0answers
371 views
Calculating distance between point and MultiPolygon Geoseries object in Python [closed]
I want to calculate the distance of a point from the Multiploygon geoseries object created using cascaded_union function of GeoPandas. Following is my code:
import numpy as np
import pandas as pd
...
0
votes
0answers
31 views
Would like to randomly sample points from within a polygon using Python [duplicate]
I would like to achieve something similar to the ArcGIS Create Random Points tool using geopandas, shapely, or rasterio. I aim to have a polygon with some holes in it (removed by subtracting buffered ...
2
votes
1answer
180 views
Calculating areas of polygons inside other polygons with GeoPandas
I have 2 geodataframes:
GDF1 is an area with overlapping polygons divided into 3 classes: (cleaning, infra and maintenance) (the black lines donates the overlapping polygons)
GDF2 consists of ...
2
votes
1answer
62 views
Write a Spatial Join output to a CSV?
I am trying this example with different input files. My aim is to merge the country and point tables into one table using sjoin from geopandas and write to a CSV file. I took a look at 1.
When I run ...
0
votes
0answers
68 views
Issue with GeoPandas method 'contains' for two GeoDataFrames
I want to verify that a GeoDataFrame called mask2 COMPLETELY CONTAINS all the linestrings in another GeoDataFrame called transect_file2.
In the image is clearly visible that transect number 16 (TR_ID=...
0
votes
1answer
100 views
GeoPandas Overlay Symmetric Difference: How to get the upper polygon
I have the following code which get the difference of a pie wedges.
c= gp.overlay(a,b,how='symmetric_difference')
How to get the upper polygon?
0
votes
0answers
81 views
Creating a grid of modifiable hexagonal tiles as overlay in geopandas
I have geo-tagged car sharing dataset which I am analyzing using geopandas. For analysis purposes I would like to create my own polygon overlay of hexagonal tiles.
I have managed to find a ...
0
votes
0answers
224 views
Visualize big data HTML file created with Folium
I have written a Folium map of a French city with the possibility of visualizing attributes informations on click for each of its polygon which makes a huge file after 2 hours of calculation with the ...
1
vote
0answers
56 views
Most effective way to find spatial relationships in python
I am trying to find the spatial relationship between two polygon geoDFs as follows:
Find geoDF1.geom within geoDF2.geom else (not within)
Find geoDF1.geom with largest intersection fromgeoDF2.geom ...
1
vote
1answer
197 views
Python - Convert shapefile lat-long value from Degree minutes seconds to Degree decimal
I am processing shapefiles in python using standard library functions like Python “shapefile” library and GeoPandas.
I have two shapefiles having the same projected co-ordinate system-> ...
0
votes
1answer
146 views
Getting geohash of LINESTRING in PostGIS?
I have some LINESTRING in PostGIS.
LINESTRING(104.011 30.637,104.014 30.638,104.022 30.640,104.026 30.645)
LINESTRING(104.022 30.666,104.031 30.659)
LINESTRING(104.044 30.655,104.056 30.655)
I ...
1
vote
1answer
40 views
Check if point in GIS polygon fails to produce correct output
I've tried many, many many, ways to find out if a point is in a GIS polygon based on many great posts, but I can't get any to work properly. Specifically I created a grid of points covering the ...
0
votes
1answer
181 views
Search plugin of Folium doesn't appear [closed]
I'm trying to reproduce the following jupyter notebook :
https://nbviewer.jupyter.org/github/jtbaker/folium/blob/geojsonmarker/examples/plugin-Search.ipynb
But once I'm trying to create the map I ...
1
vote
2answers
662 views
Click event on maps with Folium and information retrieval
I was wondering if there is a way in Folium to get the information on an entity we click on with Folium?
I'd like the map to either open a tab with the attribute information or just send back ...
1
vote
1answer
144 views
How can I avoid changes to field types in geopandas?
I am using geopandas in the following routine to create the union of 2 (polygon) shapefiles:
import geopandas as gpd
def union(fn_A, fn_B, output):
shpA =gpd.read_file(fn_A)
shpB =gpd....
