Questions tagged [geopandas]
an open source project to make working with geospatial data in Python easier.
865
questions
54
votes
2answers
62k views
Converting Pandas DataFrame to GeoDataFrame
This seems like a simple enough question, but I can't figure out how to convert a Pandas DataFrame to a GeoDataFrame for a spatial join?
Here is an example of what my data looks like using df.head():
...
43
votes
6answers
34k views
GeoPandas: Find nearest point in other dataframe
I've got 2 geodataframes:
import geopandas as gpd
from shapely.geometry import Point
gpd1 = gpd.GeoDataFrame([['John',1,Point(1,1)],['Smith',1,Point(2,2)],['Soap',1,Point(0,2)]],columns=['Name','ID','...
22
votes
3answers
23k views
Getting polygon areas using GeoPandas
Given a GeoPandas's GeoDataFrame containing a series of polygons, I would like to get the area in km sq of each feature in my list.
This is a pretty common problem, and the usual suggested solution in ...
21
votes
2answers
18k views
Joining (concat) list of similar dataframes in geopandas?
I have a list of dataframes, all of the same structure and all are polygons.
How can I add them all together using geopandas?
21
votes
4answers
13k views
Adding GeoPandas Dataframe to PostGIS table?
I have a simple GeoPandas Dataframe:
I would like to upload this GeoDataframe to a PostGIS table. I have a Database setup with the PostGIS extension already but can't seem to add this Dataframe as a ...
18
votes
3answers
16k views
Filter by bounding box in geopandas?
I have a geopandas dataframe in EPSG:4326 and I'd make a new dataframe consisting of all the rows that fall within a certain bounding box.
First I get the bounding box that I care about (which is ...
18
votes
3answers
10k views
geopandas spatial join extremely slow
I am using the code below to find a country (and sometimes state) for millions of GPS points. The code currently takes about one second per point, which is incredibly slow. The shapefile is 6 MB.
I ...
18
votes
3answers
14k views
What units are used by GeoPandas/Shapely area and distance functions?
it looks like a silly question, yet I can't find clear answer on that:
what units geopandas/shapely use calculating distance/area between objects?
17
votes
7answers
13k views
Reading raw data into geopandas
Is it possible to read raw data into a geopandas GeoDataFrame, a la a pandas DataFrame?
For example, the following works:
import io
import pandas as pd
import requests
data = requests.get("https:/...
16
votes
3answers
13k views
Dissolving polygons based on attributes with Python (shapely, fiona)?
I have been trying to create a function that does basically the same thing that the QGIS "dissolve" function. I thought it would be super easy but well apparently not. So from what I have gathered ...
16
votes
2answers
15k views
Creating polygon grid using Geopandas
I'm working with a geodataframe of points and I need to create a grid of rectangular polygons.
I know how to have bounds of the geodataframe with gdf.geometry.bounds. Now using this information and ...
16
votes
2answers
22k views
How do I write a GeoPandas dataframe into a single file (preferably JSON or GeoPackage)?
I'm new to GIS and having a basic beginner problem. I've got data in the form of a geopackage .gpkg from GADM.org. I can read in and use the data without problem using Geopandas (via built-in Fiona)....
15
votes
3answers
7k views
Find all neighbors using geopandas
I am wondering whether it is possible to identify all neighbors to each polygon using only python (with, e.g., geopandas) in the same way that can be done with python in QGIS (Find neighbors polygon).
14
votes
6answers
33k views
GeoPandas: return lat and long of a centroid point
I would like to return the lat and lon or x and y from the point object in the following series as I plan to link them with an API I built that links OSM and NetworkX. The centroids will be added as ...
14
votes
1answer
16k views
Geopandas buffer using geodataframe while maintaining the dataframe
The objective is to create a geoDataFrame with buffered geometries AND with all the "attributes" of the original geodataframe.
I am able to perform a buffer on my geoDataFrame using:
gdfHybasBuffer ...
14
votes
1answer
2k views
Why is Shapely's snapping (GEO snaps) not working as expected?
I'm trying to snap two lines to each other using Shapely/Geopandas but the result of the snapping is very odd.
I tried :
import geopandas as gpd
from shapely.geometry import *
from shapely.ops ...
13
votes
2answers
15k views
Rasterize a shapefile with Geopandas or fiona - python
I need to rasterize a really simple shapefile a bit like this http://tinyurl.com/odfbanu. Which is just a shapefile coutaining counties in the US.I have seen this previous answer : GDAL RasterizeLayer ...
13
votes
1answer
11k views
GeoPandas to_file() saves GeoDataFrame without coordinate system
I have
GeoPandas 0.2.1 py27_0
fiona 1.7.0 np110py27_1
Python 2.7.10
installed in Anaconda 2-4.1.1-Windows-x86 environment. I am able to construct GeoDataFrame by reading input datasets and ...
13
votes
1answer
1k views
Counting features into intersections of Shapely Polygons
I have a geopandas GeoDataFrame containing hundreds of shapely Polygon and MultiPolygon geometries. The polygons overlap in lots of places. I'd like to make a new geometry that contains a count of how ...
12
votes
1answer
10k views
Geopandas Line Polygon Intersection
I'm trying to find where multiple lines intersect a polygon for two different geodataframes:
from shapely.geometry import Polygon, LineString
import geopandas as gpd
polygon = Polygon([(0, 0), (1, 0)...
12
votes
4answers
11k views
GDAL ImportError: DLL load failed: The specified module could not be found
I'm running Python 3.5.4 on Anaconda and i'm trying to install geopandas. I've followed the instructions to install geopandas here -
http://geoffboeing.com/2014/09/using-geopandas-windows/ - but ...
11
votes
1answer
6k views
How can I superimpose a geopandas dataframe on a raster plot?
I have a geopandas dataframe countries with country polygons, and a raster dataset raster (read with rasterio). I've already aligned the two as follows:
countries = countries.to_crs(raster.crs.data)
...
11
votes
1answer
2k views
Center / normalize choropleth colors in GeoPandas
I'm looking to plot a choropleth with a divergent colormap. I need to center the colormap in such a way that the middle color is displayed for a specific value (e.g. 0). How could I do this in ...
11
votes
1answer
10k views
Change marker size in plot with GeoPandas
I have a geodataframe with points and some associated data. I want to plot it on a map using geopandas and have the size of the points correspond to one of the columns in the geodataframe.
So far I ...
11
votes
1answer
34k views
Create a polygon from coordinates in GeoPandas with Python
I was trying to create a simple Polygon from a list of coordinates and export it to multiple formats (including shapefile and GeoJSON) and wanted to automate it using Python. There were some good ...
11
votes
1answer
19k views
How to extract long and lat from geometry column in GeoPandas?
I read a shapefile with GeoPandas and I get a nice table with a column "geometry". This column contains shapely.geometry.polygon.Polygon or shapely.geometry.multipolygon.MultiPolygon object.
import ...
11
votes
1answer
877 views
Python: Break linestring based on condition
I have a geopandas dataframe of a bunch of linestrings that have some data associated with each vertex/point:
Point_x = (Lat, Lon, Time, ID, Data1, Data2, Data3)
The points are converted to ...
10
votes
2answers
10k views
List all polygon vertices coordinates using geopandas
I'm trying to list all polygon vertices coordinates of a rectangle with four corners and a hole with four corners. I drew the vertices in this order:
import geopandas as gpd
#import matplotlib.pyplot ...
10
votes
1answer
29k views
Geopanda write GeoDataFrame into shapefile or spatialite
I trying to save file from GeoDataFrame to shapefile or spatialite. But for some reason i got error:
My GeoDataFrame appear correctly without any issuesi look's like there is something wrong with my ...
10
votes
2answers
7k views
Merging overlapping features using Geopandas?
I have a Shapefile with overlapping features.
Is there an easy way to merge them with geopandas?
I found a way with shapely, but I would like to do it with geopandas directly.
10
votes
1answer
4k 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
...
10
votes
1answer
7k views
Crop a raster using rasterio and geopandas
I am cropping a set of historic aerial photographs. These photographs have large black areas in the edges (0 value). However there is also valid data with a 0 value. The workflow I am using is:
Load ...
9
votes
1answer
15k views
Turning GeoDataFrame of x,y coordinates into Linestrings using GROUPBY?
I have a dataframe of X,Y coordinates that represent points along the paths taken by several different entities. Pseudo-data here, but it is roughly of the form:
entity_id lat lon time
1001 ...
9
votes
3answers
3k views
geopandas error “minimums more than maximums”
I posted this question on stackoverflow here, but it seems that gis.stackexchange is the more appropriate platform.
I am trying to merge two geodataframes in geopandas (want to see which polygon each ...
9
votes
1answer
8k views
Reading the names of geodatabase file layers in Python
I'm looking at New York City's Projected Sea Level Rise dataset. This dataset states that it is:
Geodatabase of projected sea level rise based on models released by New York City Panel on Climate ...
9
votes
1answer
3k 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,...
9
votes
2answers
15k views
Geopandas Polygon to matplotlib patches Polygon conversion
Unfortunately geopandas plotting is extremely slow and takes a lot of resources, hence I would like to use instead matplotlib for plotting.
When I use pure Fiona to open and read the shapefile I ...
8
votes
4answers
19k views
How to use GeoSeries.distance to get the right answer
When I want the distance between two points [(117.454361,38.8459879),(117.459880 ,38.846255)] (longitude,latitude) on the earth, I take the GeoSeries.distance method, but the method does not give me ...
8
votes
1answer
12k views
Cannot get plot() in geopandas to produce a map of the GeoDataFrame
I have installed all the necessary and optional modules for geopandas (with the exception of rtree) as listed at http://geopandas.org/install.html
I am following the tutorials from this site and also ...
8
votes
4answers
14k views
Handling KML/CSV with geopandas - DriverError: unsupported driver: u'CSV'
I'm trying to import a dataset of UK postcode districts UK postcode districts from Google Fusion tables into geopandas with the aim of splicing it to a dataset of house prices.
The problem is that ...
8
votes
1answer
3k views
Dissolve not based on attribute in GeoPandas?
I would like to dissolve a shapefile regardless of attribute content using geopandas. The regular dissolve can be accomplished with something like this:
import geopandas
all = geopandas.read_file(...
8
votes
1answer
6k views
Shapely polygon union results in strange artifacts of tiny, non-overlapping areas
I am not sure if this is a shapely bug or a problem with my polygons.
I have a bunch of polygons that look like this:
They are level-12 watersheds provided by HydroBasins, and are presumably non-...
8
votes
2answers
6k views
Calculating length of polygon in geopandas?
For example to calculate the area is like this:
df['area']=df['geometry'].area
How do we find the length of the perimiter?
8
votes
1answer
7k views
Plot shapefile on top of raster using plot and imshow from matplotlib
I need to plot a shapefile on top of a raster. I would like to use the python package rasterio and some combination of fiona or geopandas to load the shapefile.
I found an example in the rasterio ...
8
votes
1answer
2k views
Geopandas and Zonal Statistic error
I'm trying to use Geopandas and zonal statistic from rasterstats together.
I run this code
import geopandas as gpd
from rasterstats import zonal_stats
geodf = gpd.read_file("SHP/shape.shp&...
8
votes
1answer
11k views
Add CRS to a shapefile in Geopandas?
I am trying to add CRS to a shapefile that I am exporting:
shp1= gpd.read_file(i[1],encoding='iso8859_7',crs_wkt='2100')
shp1.to_file(out,encoding='iso8859_7',crs_wkt='2100')
When I import it to a ...
8
votes
1answer
4k views
Sharing a Folium Interactive Map w/ Embedded Markers
I have been experimenting with a few Python packages that have great potential for my dissertation research. Since I use pandas for pretty much everything, geopandas was a natural choice for working ...
7
votes
2answers
6k views
Geopandas equivalent to select by location
I have 2 geodataframes:
A single multi-part polygon
Many points
I have read them in with the following:
poly=gpd.read_file('C:\\Users\\srcha\\Desktop\\folder\\poly.shp')
points=gpd.read_file('c:\\...
7
votes
3answers
5k views
Colorizing polygons based on color values in dataframe column?
I preparing some choropleth election result maps in Geopandas. The assigned color for each electoral district must correspond with the winning party (a color that I pre-determine), and the intensity ...
7
votes
1answer
8k views
geopandas: can't save geojson
My task is to upload geojson, add data from corresponding csv, drop some columns, then save it back to geojson.
However, after I did everything, added csv data (gj.join(df) ), etc,
I can't save it ...
