Questions tagged [fiona]
Fiona is OGR's new, neat, Pythonic API
214
questions
1
vote
2answers
95 views
CRS error working with Solaris [closed]
result_polys = sol.vector.polygon.georegister_px_df(mask2poly,
affine_obj=tile_tfm,
crs= 'epsg:4326')
...
4
votes
1answer
58 views
GeoPandas Intersect function gives different result to Shapely
Using this example dataset of country geometries, I seem to get a different result on whether or not the USA and Mexico intersect when I do the calculation
with GeoPandas as opposed to directly with ...
1
vote
0answers
22 views
Offset after clipping an image using rasterio.mask (illustrated with figures) [closed]
I want to clip an image named img_A of dimensions 14000x10000 using a polygon shape in order to get the same dimensions than another image named img_B of dimensions 1925x1372 (see figure 1 below). The ...
3
votes
0answers
67 views
Setting DXF colors via Fiona
One might expect that the "Color" CAD field would control this, but the driver doesn't allow it to be set.
schema = {'Layer': 'str', 'Color': 'int'}
with fiona.open(path, 'w', 'DXF', schema=schema) ...
3
votes
1answer
69 views
Find the closest line to a polygon Python Rtree
I have a series of fields and roads I am trying to find the nearest road to each field. I want to add field to each of my polygons with the index/name/etc of the closest road.
Would this be the ...
1
vote
1answer
48 views
How to write a multi geometries .geojson file with Shapely/Fiona?
I am very new to fiona and shapely, and trying to do something that doesn't seems to be designed : I have a list of points and a shapely.MultiPolygon (Voronoi polygons from the previous list of points)...
1
vote
1answer
191 views
Convert lines to polygons with shapely polygonize
I have a line shapefile that I am trying to convert to polygons with python using fiona and shapely.
inFile = '/content/drive/My Drive/polyline.shp'
outFile = '/content/drive/My Drive/polygon.shp'
...
0
votes
0answers
60 views
Reading GeoPackage file bigger than RAM size with GeoPandas?
I have a gpkg file that's around 10GB, and 8GB of RAM. So, if I were to read my file:
import geopandas as gpd
fp = "/path/to/my/file.gpkg"
data = gpd.read_file(fp)
print(data.shape)
My computer ...
0
votes
2answers
151 views
Python convert lines string to polygon if closed
I have a series of contour linestrings some are closed and some are not. The linestring values are between -1 and 1. I am trying to create polygons from the linestrings if they close and keep the ...
0
votes
1answer
208 views
Getting CRS to export shapely polygon to shapefile
I am trying to export a shapely polygon to a shapefile. I have tried this, but the CRS is missing, when I try to import it in to QGIS.
The shapely polygon is from this OSMNX example but edited to ...
0
votes
2answers
38 views
Getting MemoryError from Fiona when merging large amounts of buffered data (Python)
I am using fiona and shapely together to buffer points and then merge them and write them to a shapefile. For almost all of my datasets, this is working fine. However, I am currently getting a ...
1
vote
0answers
25 views
Obtaining least number of grids (polygons) covering a separate polygon while the grids are overlapping
I have grids as polygons where the grids are overlapping. I want list of grids covering a separate polygon. The image below demonstrate the problem. The red lines are the edges of the grids and the ...
0
votes
1answer
165 views
Installing rasterio and Fiona together?
I work on Windows; I use Christoph Gohlke wheels; Python 3.7
After installing GDAL-3.0.1 and Fiona-1.8.6
an error occurs on import of fiona
from fiona.ogrext import Iterator, ItemsIterator, ...
3
votes
1answer
240 views
Convert contours to polygons maintaining attributes using Python?
I have a series of polylines(contours) that i want to convert to polygons using Python (GeoPandas, Fiona, Shapely). Because these are contours, there will be donut polygons, can anyone point me to how ...
2
votes
1answer
219 views
Creating equally spaced coordinates on California state map created with basemap?
I have created a California state map with basemap Python library and this shapefile.
Code is below
from mpl_toolkits.basemap import Basemap
import matplotlib.pyplot as plt
fig, ax = plt.subplots(...
1
vote
1answer
333 views
Geopandas read_file only reading first part of KML
I am trying to read the following file with GeoPandas:
import geopandas as gp
gp.io.file.fiona.drvsupport.supported_drivers['KML'] = 'rw'
df = gp.read_file('http://watchthemed.net/index.php/json/...
0
votes
0answers
106 views
Fiona installation in Python 3.6 ERROR: Command “python setup.py egg_info” failed with error code 1 [duplicate]
I'm trying to install Fiona using pip in Python (v 3.6.8). I'm using the following command:
python36 -m pip install Fiona
I'm getting the following error:
1
vote
0answers
34 views
Select features of a shape which are not in another shape
I have a shape with some features (let's say 100) and a second shape with some of this features (50) buffered (5 meters inside buffer). I want to select and write in a new shape every feature of the ...
0
votes
2answers
156 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 ...
4
votes
1answer
114 views
Using libraries other than PyQGIS to develop plugin for QGIS?
I develop a plugin for QGIS. Before to integreted it in the QGIS I developped it with GIS library (Fiona, shapely, geopandas, ...) and it work well. Now I try to build it with plugin_builder of QGIS. ...
2
votes
1answer
510 views
Quickly find all polygons that overlap with two or more polygons in Shapely
I have a set of Polygons (in Shapely) that I wish to find all intersections that are comprised of overlaps of two or more polygons. I have been working based off the code found in this answer. I have ...
2
votes
0answers
101 views
Creating a shapefile within a zip file with Fiona
According to the Fiona documentation "Fiona lets you read and write zipped Shapefiles."
But I can't find any examples of writing (with Windows file paths). Trying this...
with fiona.open('output_shp....
1
vote
0answers
111 views
How to segment polygon in to line segment?
I want to segment a Polygon or PolyLine in segment of line and remove some segments. I have an polygon that i convert in polyline by the code below and it work well:
from shapely.geometry import ...
0
votes
0answers
69 views
Writing only one of the input vector fields to output vector using Fiona/ Python?
I'm working on a function to perform operations on folders of vector files.
These files might have differing attribute fields but there will be a common field between them. I'm using fiona in python ...
3
votes
1answer
123 views
Writing Non Spatial Table into Geopackage - Python
Just wondering how to write a non spatial (aspatial) table to geopackage using python. I have attempted using Fiona,
geopackage = 'some_geo.gpkg'
layer = 'test_layer'
schema = {'geometry': {'type'...
0
votes
1answer
385 views
Dissolving polygons to single part features with Python (shapely and fiona)?
I used the code from Dissolving polygons based on multiple attributes with Python (shapely and fiona)? to dissolve a shapefile using shapely and fiona. However the output creates multi-part geometries....
2
votes
1answer
350 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....
0
votes
0answers
191 views
Geopandas to_file() gives an error regarding fiona.drivers(). Is it possible to work around this?
I'm using geopandas to get WKT and coordinates from a database:
df = pandas.read_sql(con=conn2, sql=test_query)
df['Coordinates'] = df['WKT'].apply(lambda x: wkt.loads(x.read()))
gdf = geopandas....
2
votes
1answer
206 views
Sorting (ORDER BY) rows from Shapefile using Python?
I'm writing a Python script where I have to read a Shapefile, sort its rows/records by a specific field, and then write a new shapefile with that new order.
Does anyone how can I do it?
I'm using ...
1
vote
0answers
254 views
Write feature collection to S3
Is there a way to write a feature collection from Python memory to an S3 bucket (as Esri Shapefile, zipped Shapefile or something else) without writing it first to disk?
I tried writing to a ...
2
votes
1answer
295 views
Calculating Length of Line features using GDAL, Shapely libraries of Python [closed]
I have a line shapefile named "river" which has 385 features. I would like to calculate the length of each feature using Python. I am currently using GDAL, Shapely, and Fiona libraries.
2
votes
0answers
2k views
How to prevent “Type error: unhashable type” while writing properties with Fiona?
Using shapely's dissolve method I created new geometries from two existing shapefiles. Now I would like to save those new geometries and their properties with Fiona.
I have tried to write the ...
3
votes
1answer
2k views
Open GPKG embedded layers in python
I have a gpkg with multiple tables, and I am trying to load it with geopandas:
import geopandas as gpd
filename = '~/example.gpkg'
gdf = gpd.read_file(filename)'
This returns the first table/layer ...
3
votes
1answer
2k views
Snap points shapefile to line shapefile using shapely
I have 2 datasets: 1) a road network shapefile which has many polylines and 2) a bus stop shapefile which has many points representing bus stops. My points shapefile has CRS of EPSG 4326 and my line ...
2
votes
1answer
54 views
Python Fiona affecting external GDAL binaries?
Curious if anyone else has encountered this before and may have an explanation:
In my Python workflow, I'm importing fiona (1.8.4) to manipulate shapefiles, and then later downstream I'm shelling out ...
1
vote
1answer
109 views
Why does shapely intersection of two lines change behaviour when fiona module is imported?
I am having issues with calculating an intersection of two LineStrings using Shapely. Such an intersection should return a point, yet my code returns a LineString. I found a simple example of an ...
0
votes
1answer
636 views
Create Shapely linestring from string of coordinates in text format
I have a DataFrame where one column consists of lines stored like so:
'[[-7.61, 42.15],[-6.62, 43.16],[-8.9, 41.0],[-9.2, 40.5]]'
Is there an easy way to read these lines directly into shapely ...
1
vote
0answers
141 views
Basic Python plotting [closed]
Sorry if I sound like I don't understand, but I've been reading around trying to figure out how to do geospatial plotting in Python. I keep running into errors despite the examples I've seen appearing ...
0
votes
1answer
282 views
Using GeoPandas, Shapely and Fiona to “select” state from shapefile, save it and display it? [closed]
I have the usual US census states shapefile for the 48 contiguous states. I am trying to select a state of interest from that shapefile then save that shapefile and display. I want to use GeoPandas, ...
3
votes
1answer
716 views
Creating shapefile file with Fiona and GeoPandas?
I am trying to create a shapefile and a geojson using geopandas and fiona.
import fiona
import fiona.crs
...
geometry = [Point(xy) for xy in zip(df['longitude'],df['latitude'])]
crs = {'init': '...
2
votes
0answers
377 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 ...
7
votes
2answers
9k 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)....
1
vote
0answers
73 views
Spatial join of building footprints with Shapely and Fiona
I would like to do a spatial merge of the address nodes of Baton Rouge into their surrounding building footprints. Every building (polygon) should get the properties of the address (point).
Here is ...
1
vote
1answer
324 views
Take pixel locations from rasterio raster and write out shapefile
I'm pulling a satellite image into python with rasterio, running some analysis to find a specific bounding box within that image, and then want to write those points out as a shapefile. I'm struggling ...
1
vote
0answers
53 views
Why does my Fiona output look different from my image
I'm trying to export my houghlines as a shapefile, which works. But the output the lines in my shapefile are very different then the generated hough lines that are shown on the image.
Example:
The ...
0
votes
1answer
309 views
Dissolving polygons based on multiple attributes with Python (shapely and fiona)?
I would like to dissolve a polygon shapefile based on two different fields, using Python and open source libraries.
I'm just able to dissolve the shapefile using one single field, with Gene's answer ...
1
vote
1answer
157 views
Error creating buffers in shapefile
I have a function to create buffers from everything in a shapefile, but I'm getting an error on some files: Record's geometry type does not match collection schema's geometry type: 'Polygon' != '...
0
votes
1answer
165 views
Print just coordinates
I am relatively new to coding, but I am using fiona within python and would like to print the coordinates that make up the points of the polygon to later add to a separate list. However I am having a ...
2
votes
1answer
171 views
Clipping a raster by polygon and getting the sum of pixel values in webapplication
I am loading a layer with points and a raster one in an OL2 map. The layers come from a geoserver. What I want to do is to apply some buffers to the points and based on the buffer to get the sum of ...
1
vote
0answers
51 views
How to read coordinates in this specific format
I'm trying to create a shapefile consisting of lines from my python output. The output of the function is :
[[[400 421 427 114]]
[[227 475 237 356]]
[[408 383 427 124]]
[[456 322 500 327]]
[[436 ...
