Questions tagged [geopandas]
an open source project to make working with geospatial data in Python easier.
184
questions with no upvoted or accepted answers
5
votes
0answers
202 views
Nearest neighbour joins for two geodataframes using KDtree from scipy/sklearn
I have a number of large geodataframes and want to automate the implementation of a Nearest Neighbour function using a KDtree for more efficient processing. The process I want to achieve here is to ...
5
votes
1answer
547 views
Geoalchemy: insert 3D elements in PostGIS database
I have shp files that I would like to insert into a PostGIS database. I'm planning to use Geoalchemy2 and geopandas to do so. However, my data have the geometry types LINESTRING Z and POINT Z. As I ...
5
votes
0answers
430 views
What's the fastest way to convert large csvs to point shapefile
I'm working in QGIS, and my current method to change csvs to shapefiles is to import them to QGIS, right click and save as shapefile. For large CSVs (over 100 million rows) it can take quite some time ...
4
votes
0answers
449 views
Wrong reprojecting of a shapefile with to_crs in GeoPandas
When reprojecting an ESRI Shapefile (EPSG:21781) into an EPSG:4326 with QGIS and then importing the resulting file in GeoPandas and plotting it, the coordinates are correct.
When importing the same ...
3
votes
0answers
48 views
How do I find where a line intersects itself?
I am using Python 3.7 with Shapely and GeoPandas.
I have a big line of 181,000 points, and would like to find all the points where the line intersects itself. It does so a lot.
I don't need a new ...
3
votes
0answers
202 views
OSError - cannot import geopandas
While trying to import geopandas error occurs:
Exception has occurred: OSError Could not find lib geos_c.dll
or load any of its variants [].
I downloaded GDAL and fiona for Python 3.7 from this ...
3
votes
1answer
191 views
Generating transects perpendicular to Shapely/Geopandas Line
I'm doing an analysis on transects going perpendicular to a 1000m topographical contour line and I'm struggling to find a good way to create evenly spaces transects perpendicular to that contour.
As ...
3
votes
0answers
182 views
Find a centerline of an intersection between two irregular shaped polygons
I have two irregular shaped polygons that overlap each other at least in at two points. I want to first find the intersection area between all of them, then for the polygon pair that intersects I want ...
3
votes
0answers
250 views
Making polygon for every point in set using voronois?
I'm trying to make polygons from points, were each point will be represented by one polygon. I tried using voronois, but the results are incomplete. While I more or less understand where this ...
3
votes
0answers
852 views
Multiprocessing with geopandas
I am learning how to implement the multiprocessing with spatial data using the module multiprocessing.
I am trying to implement a spatial intersection between a polygon file and a grid file.
I am ...
3
votes
0answers
1k views
Overlay Union Geopandas improve performance
How to speed up the "union" of two shapefiles using geopandas?
I have two large shapefiles:
geodataframe_left.shape = (3610, 12) (500 MB) (link)
geodataframe_right.shape = (16396, 3) (200 MB) (link)...
3
votes
0answers
235 views
Memory errors when doing Zonal Statistics on a multi polygon shapefile in Python
I want to calculate the mean NDVI with the EthNdvi.tif file for each zone (there are around 650 admin zones) in the the woreda shapefile. I'm having some issues with running the following lines of ...
3
votes
0answers
376 views
GeoPandas causing issues with PyQGIS standalone
I have a code where I would like to be able to use both GeoPandas and PyQGIS. However, it seems that including GeoPandas is causing issues in the output of PyQGIS.
Here is a small illustration using ...
3
votes
0answers
974 views
draw map scale in geopandas
Is there a geopandas version of basemap's m.drawmapscale function?
If not, can I somehow utilize basemap's drawmapscale function within geopandas?
3
votes
0answers
2k views
Create custom color map for multiple GeoPandas plots to share same scale
My objective is to create a 2x2 figure where each cell in each grid is on the same color scale. Currently, I haven't found a compound plot option in GeoPandas that allows me to plot one GeoDataFrame ...
3
votes
0answers
3k views
Using polygons to create mask on 2d grid with Python?
I have some polygons (Canadian provinces), read in with GeoPandas, and want to use these to create a mask to apply to gridded data on a 2-d latitude-longitude grid (read from a netcdf file using iris)....
3
votes
0answers
2k views
Folium heatmap not displaying
I have an output file data.json
[{"5403": 2, "9734": 1, "2565": 5, "5087": 2, "9061": 1, "1761": 4, "4811": 7 "1111": 5, "3891": 3, "1962": 3}]
and a shapefile converted to geojson https://www....
2
votes
0answers
17 views
Unable to install geopandas using conda install
I'm trying to install GeoPandas using the Command Prompt terminal. I have Python 3 and ArcGIS installed. I keep getting these messages that say there is a conflict with various packages. For example:
...
2
votes
0answers
39 views
Converting dataframe with Polygon to GeoDataFrame
I imported a shapefile in the form of a pandas.dataframe and ran operations on it. But I can't convert the dataframe to a geodataframe. I tried with gpd.GeoDataFrame, and with wkt.loads. I think I ...
2
votes
0answers
86 views
Exporting GeoTIFF raster to GeoPandas dataframe
I'm just starting in the field of GIS (mostly worked with just python before) and got stuck on a problem. I'm looking for a way to polygonize an already masked GeoTIFF raster with population data in a ...
2
votes
1answer
80 views
Find nearest polygon (from GeoSeries) to point (from GeoSeries)
I have two GeoSeries, consisting of points and polygons. I want to find the polygon in dataframe B that is closest to each point in dataframe A. The polygons are rooftops from https://github.com/...
2
votes
1answer
76 views
Seperate each row of points from shapefile with latitude and longitude information
I have a shapefile which has point geometry points with latitude and longitude values.The image when opened in QGIS looks similar to the below picture and I want to know whether I can separate each ...
2
votes
0answers
25 views
How to overlay and combine a choropleth and a shaded raster in Python?
I want to make a choropleth map of regions but shade it according to local population density. This is not the problem of masking a raster with a shapefile but to overlay two representations of data ...
2
votes
0answers
40 views
How to do nearest neighbor search more quickly?
I am currently using geopandas and scipy.spatial to do a nearest neighbor query. I have a data set of close to a million points and I need to find all of the closest points from another data set that ...
2
votes
0answers
61 views
Geopandas shows points outside of buffer geometry even though inside
I have some ship trajectories and I want to know which point of the trajectory is inside the port(=buffer) and which points are outside. The following picture shows my Geopandas Dataframe with the ...
2
votes
0answers
160 views
Find spatial and temporal variability from a GeoPandas dataframe of polygons
I have a geopandas dataframe of polygons (all rectangles ~100mx120m) and each of these polygons has an attribute for time and % ice coverage. This is all derived from imagery I collected in the ...
2
votes
0answers
41 views
Calling geopackage in a loop, “database is locked” error
I try to loop through a folder containing multiple geodatabases (12). After performing some calculation I try to save the results in a new shapefile located in another folder, but the code generates ...
2
votes
0answers
276 views
Plotting GoeDataFrame on a raster
I have a bunch of polygons which I loaded from a shapefile into a fields GeoDataFrame:
geometry raster_val
0 POLYGON ((8.56799 47.80800, 8.56799 47.77200,...
2
votes
0answers
47 views
Create sequential ID column type when loading GeoDataFrame to PostGIS
Is there a way to define GID column as sequential (auto-incremental) when loading GeoDataFrame (created from Shapefile) to PostGIS?
I use Geopandas and "to_sql" method:
geodataframe.to_sql(tablename, ...
2
votes
0answers
603 views
GeoPandas transform latitude/longitude coordinates to UTM coordinates
I have a shapefile which I read with GeoPandas, this shapefile has lat/long coordinates and I want to transform it to UTM coordinates.
I tried this:
shapefile = gpd.read_file('example.shp') #CRS = ...
2
votes
0answers
194 views
Add WMS to matplotlib Python
Currently I am adding a basemap from stamen.com to my plots as it is explained here: http://geopandas.org/gallery/plotting_basemap_background.html .
Is it also possible to load a WMS from another ...
2
votes
0answers
82 views
GeoPandas spatial join generates error in QGIS 3.8 Python console
I want to execute a spatial join using GeoPandas in the Python console QGIS 3.8 like this:
dfsjoin = gpd.sjoin(point, polygon)
but it doesn't work. It always shows the following error:
Exception ...
2
votes
0answers
67 views
Plotting Geopandas Gallery example fails?
I have been having trouble getting the figures from the example provided in Geopandas Gallery examples. When I ran these scripts in Jupyter console:
import geopandas
import geoplot
import matplotlib....
2
votes
1answer
566 views
Finding shortest distance from point(s) to number of polygons at varying angles using shapely?
My aim is to calculate the distance a point is from land in Python, trying to replicate the functionality of fetchR.
Given an origin and distance, I create shapely LineStrings which radiate out from ...
2
votes
0answers
388 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 ...
2
votes
0answers
931 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
...
2
votes
0answers
536 views
How to get fast writing with Geopandas & Fiona?
I have a GeoDataFrame with 1,2M records, and want to write it into a GeoPackage file. Currently, it takes >20 minutes, and, as I calculated, average write speed is 100 recs/sec.
As I read in the ...
2
votes
0answers
4k views
display geojson file with folium (using geopandas to generate file)
I can not display properly a geojson file in folium using the GeoJson function. My file is made with geopandas, has some tags as fields and also a geometry field. In each row, in the field of geometry,...
2
votes
0answers
359 views
geopandas' .crs doesn't store crs on 'proj' file
As occurred in this question: Add CRS to a shapefile in Geopandas?
f.shp has not crs
This code:
shp=gpd.read_file('f.shp')
shp.crs = {'init' :'epsg:2100'}
out=path
shp.to_file(out)
doesn't ...
2
votes
0answers
534 views
ValueError: Geometry column cannot contain mutiple geometry types when writing to file
I have this list:
shapefiles that has these directories for the files: (pairs of pst and dbound) in each folder.
[['C:\\Users\\user\\Desktop\\eff\\20194\\DBOUND\\DBOUND.shp',
'C:\\Users\\user\\...
2
votes
0answers
366 views
TopologyException issue when doing intersection in Geopandas?
When I do overlay processes like intersection, I mostly get:
:TopologyException: found non-noded intersection between LINESTRING
(229971 4.39944e+06, 229971 4.39944e+06) and LINESTRING (229971
...
2
votes
0answers
754 views
Get raster pixel value within a shapefile polygon
I have the below GeoPandas dataframe that has:
two columns: geometry and raster_val
13 rows
The first row is shown below.
geometry raster_val
0 ...
2
votes
0answers
343 views
geopandas dissolve versus postGIS postgresql aggregated groupby dissolve
I have a geodataframe for which I want to dissolve the geometry based on an attribute (fao_id). In geopandas this is easy as gdf.dissolve(by="fao_id", aggfunc="first") but unfortunately this fails due ...
2
votes
0answers
3k views
GeoPandas save to shapefile issue: Unable to open EPSG support file
When I try to use to_file() to write a GeoPandas GeoDataFrame to a shapefile I get the following error.
df3.to_file('~/Desktop/testout.shp', driver = 'ESRI Shapefile');
ERROR:Fiona:OGR Error 4: ...
1
vote
0answers
22 views
How to vectorize creating a Shapely Polygon in Pandas
I have a GeoPandas DataFrame with a polygon in each row. I want to add a column with coordinates of a bounding box of each polygon. I can do it this way:
def create_bbox(row):
xmin, ymin, xmax, ...
1
vote
0answers
27 views
Find the nearest point on polygon (coastline)
In python I have a shapely polygon (which defines the coastline of the UK), given a point within the UK I would like to find the closest point on the polygon (coastline) to that point. I have been ...
1
vote
1answer
27 views
Error when saving geodataframe to geojson after a spatial join
I am writing a simple python code to perform sjoin on two geodataframe.
gdf1 = gpd.read_file(polygon1.geojson)
gdf2 = gpd.read_file(polygon2.geojson)
gdf = gpd.sjoin(gdf1, gdf2, how="...
1
vote
0answers
28 views
Finding “most frequently intersected area”?
I have a geodataframe that contains geometries of droughted area for several years. To identify consistently droughted areas, I want to find areas that are droughted for the largest number of years.
...
1
vote
0answers
26 views
How to extract lat, long coordinates from Geography type column in dataframe using SQLAlchemy?
This is the SQL command that works perfectly.
SELECT lonlat,
ST_Y(lonlat::geometry) AS latitude,
ST_X(lonlat::geometry) AS longitude
This is the output of the SQL command.
lonlat ...
1
vote
0answers
29 views
How to write to geopandas dataframe directly to (Google) Cloud Storage?
I would like to write a geopandas.Dataframe directly to (Google) cloud storage, from the documentation fiona enables this, however I am not sure how to supply the correct **kwargs for the geopandas....
