Questions tagged [shapefile]

A vector data storage format for storing the location, shape, and attributes of geographic features. Often referred to as 'an ESRI shapefile', as ESRI developed it.

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117 views

OGR failing to unpack polygons and respective holes from shapefile

I'm trying to unpack shapefiles in Python (v3.7.4) using the GDAL-OGR library (v2.3.3). Each shapefile has only one feature containing multiple polygons with holes. They cannot be produced differently....
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1answer
114 views

Fetching the on-click data from the website into QGIS

I would like to fetch the on-click data into QGIS and show them as the placemarks. Basically the issue comes from i.e this website: https://eclipse.gsfc.nasa.gov/SEgoogle/SEgoogle2001/...
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753 views

When does a QGIS .qix spatial index of a shapefile need to be re-created?

I understand the basics of spatial indexes but would like to understand when exactly a spatial index would need to be re-created or updated? The reason I ask is because when a folder was moved to a ...
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1k views

What is the best way to display a large shapefile (with polygons) as a layer on a leaflet map?

I have a leaflet map of the UK with around ~2000 points total points and a bit of metadata loading for each point with two side-panels showing the metadata. These points are drawn from several tables ...
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477 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 ...
5
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1k views

QGIS: Release file lock on file used in a processing algorithm at the end of script

I am using runalg (qgis:joinattributesbylocation) on two QgsVectorLayer objects. At the end of my script I'm trying to delete all the files created during the script. I can delete everything except ...
5
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1k views

How to set Vertical Coordinate system when creating a 3D shapefile?

I'm working with GDAL v1.11 and am seeing the vertical CS stripped when exporting a 3D shapefile (from oracle spatial). This is the command I'm running: ogr2ogr -f "ESRI Shapefile" B_POINT.shp (...
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59 views

ogr2ogr creates too many columns with LEFT JOIN

I am creating a GeoPackage using several shapefiles using ogr2ogr (GDAL 2.2.4): ogr2ogr -f GPKG /path/to/out.gpkg -append -nln out -a_srs EPSG:4326 /path/to/in1.shp ogr2ogr -f GPKG /path/to/out.gpkg -...
4
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3answers
8k views

Export shapefiles in QGIS to import to ArcMap

I have one question regarding export shapefiles from QGIS to import after to ArcMap 10.6. I export the shapefiles as Save data/ESRI shapefile. After when I try to upload in ArcMap this shapefile, I ...
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488 views

How to select points with point ids from external list

I have a point shp and list of point IDs in CSV file which match with point IDs in the shape. Points in SHP have location while points in the external file don´t. How can I select points in the shp ...
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333 views

Import Large Shapefile to Postgres

I'm trying to import a large dataset to Postgres, of about 600MB, that sits on a remote AWS server. But I get the following error Not enough memory to allocate requested memory (nRecords=26923892). ...
4
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1k views

How to clip a big shapefile from another shapefile's extent

I am working on mangroves in Sundarbans (Bangladesh / India), using Landsat pictures. I need to equalize them in reflectance, before classification, for the evolution of the biomass in this region. I ...
4
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889 views

Creating Shapefile spatial index programmatically in .NET?

I am creating a shapefile programmatically using DotSpatial using the following example syntax / pseudo code FeatureSet features = new FeatureSet(DotSpatial.Topology.FeatureType.Polygon); features....
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993 views

Open shapefile in ArcGIS Runtime WPF SDK as Graphics/Feature layer

I Googled and followed this tutorial and figured out how to import Shape files and Rasters into Runtime. However, it seems most of the functionality uses a FeatureLayer/GraphicLayer instead an ...
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2k views

Ogr2ogr: Unable to open datasource problem

I downloaded the Precints shapefile from the City of Boston's data hub, and I'm trying import it into SQLServer (I'm running the Express verson). I've already created the database in the SQLServer (...
4
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1answer
1k views

Counting and rasterizing polygon overlaps in QGIS?

I have a large number of polygons that are overlapping. I'd like to create a heat map and plan on using raster calculation to do this. My plan: to give each polygon a raster value of 1, and adding ...
3
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0answers
27 views

Inconsistently getting “Input shapes do not overlap raster”, CRS appear to match

Masking topographic raster data by a shapefile (bedrock geology polygon). Following this guide I do this: with fiona.open("geology.shp", "r") as shapefile: geology_mask = [...
3
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0answers
49 views

Plotting the albedo using Python

import glob import numpy as np import pandas import os import rasterio import geopandas as gpd import matplotlib.pyplot as plt def get_image_stats_only(img_array): raw_stats_dictionary = {'mean':...
3
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2answers
106 views

Inserting only subset of columns of shapefile to existing PostGIS table with different column names?

The situation So I have a shapefile with several columns: id|name_en|name_es|name_de|name_fr|... I also have an existing PostGIS table on my remote server: county_id|county_name|county_name_de|...
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0answers
61 views

Extract pixel values in raster stack using shp

I am using the following code to extract mean pixel values over an area represented by a polygon: mean<-lapply(S2_stack, FUN=function (S2_stack) {data.frame(mean=extract(S2_stack, polygons2, fun=...
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0answers
69 views

Difference in raster pixels between Windows x86 and Windows x64

I have a huge problem and I can not find a reason for it. I have two PCa, one in my house and the other in my workplace. The first one is an old notebook with Windows x86 and the other is Windows x64. ...
3
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0answers
283 views

QGIS 3.4.6 Cannot create fields in new shapefiles

Running 3.4.6 on Windows 10. Until today I have had no problems creating new shapefiles and fields. Now when I create a new shapefile everything in the new dialog box works as usual when I create ...
3
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0answers
54 views

QGIS – Edits to shapefile attribute table won't save special characters

I'm working in QGIS with a Government of Canada shapefile of all 338 federal electoral districts. The encoding is UTF-8. In the attribute table, all of the em dashes ("—") that should appear in the ...
3
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0answers
75 views

Shapefile polygon operation efficiency

I would like to make a graph from a shapefile, where edges would express spatial relations between polygons according to DE-9IM For that, I use fiona + shapely My code is working but it is extremely ...
3
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2answers
637 views

QGIS “Sum Line Lengths” return 'nan.'

I have a polygon shapefile and a (merged) line shapefile (both are zipped). When I use Vector -> Analysis Tools -> Sum Line Lengths on these shapefiles, I get a layer with some of the LENGTHS filled ...
3
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0answers
200 views

ogr SetPrecision doesn't work

I'm creating a shapefile with a field type of real, but I want to lower the standard precision from 15 decimal places to 10, here is my code: dst_filename = "Polygonized.shp" drv = ogr....
3
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0answers
3k 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
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0answers
100 views

Extracting information from netcdf file

I started using QGIS yesterday since ArcGIS refuses to work, and I have my difficulties with it. In short, I want to extract the information on GCP from this netCDF file, so that I can perform geo-...
3
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0answers
72 views

Given a line find whether another line is along side, N,E,S,W or not

I have a shapefile representing roads (Black) and I need to know whether another line object (Red) is to the side of it. Including the orientation between them, to define whether the Red line lies to ...
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0answers
1k views

Draw shapefile over PNG image in R

I have a satellite image as a PNG with known coordinates (bottom, left, top, right). I want to draw a shapefile on it (the limits of a county) in R. My first thought was to convert the PNG (it's read ...
3
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0answers
140 views

Join CSV to shapefile failing when in saved map document in QGIS

I am trying to join a CSV file to a shapefile by matching on attributes. Here is the minimal workflow: Import shapefile in blank document. Save attributes of shapefile to CSV. 2.5 eventually, I ...
3
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0answers
135 views

Enabling an Edit on Shapefile in QGIS only with a password?

I´m customizing some tasks in QGIS 2.14 using Python. I am managing these edits in different layers (always shapefile layers, not database). In one of them I want the users to enter a password ...
3
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0answers
68 views

QGIS - Layer missing polygons after pointsfile transformation

I'm using pointsfile transformation in QGIS for the georeferentiation of my layers. After the transformation the result some times has polygons missing like here: Why is this happening? How do I ...
3
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0answers
475 views

Loading components of shapefile in QGIS?

I have a zipped shapefile with all components in place. It has a .shp file, a .dbf file and a .shx file.Projection file (.prj) and .sbn and .sbx files are also in place. I have tried loading the ...
3
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0answers
431 views

QGIS Error Loading Shapefile with Database Manager

I am a new QGIS user and have downloaded version 2.18.2 onto my PC (Windows 10). I'm trying to import a shapefile (using Database Manager) into a spatialite database that I created. However, I keep ...
3
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0answers
534 views

ogr2ogr{gdalUtils} correct syntax to set Ground Control Points for vector georeferencing

I would like to know correct syntax of R {gdalUtils} package (version 2.0.1.7) to georeference Shapefiles using corner points as GCPs. (These Shapefiles have y=height and x=width information, without ...
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0answers
349 views

Raster flipping latitude or not showing shapefile on basemap

I am trying to save a 2D numpy array as a raster, and then split the raster using shapefiles. When I create the raster, I either have the problem of the latitude being flipped upside down, or that the ...
3
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0answers
500 views

Insert shapefile features into PostgreSQL database using java EE (pragmatically)

I am working with PostgreSQL 9.4 and Java EE. I want to insert shapefile or layer's features into PostgreSQL, is there any solution so I can insert the whole shapefile into the database? OS is Windows ...
3
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0answers
2k views

Change default “save as” folder QGIS

I would like to change the default path for saving layers ("save as" in the main layers panel). Now the default is C:\Program Files\QGIS Lyon\bin (in which I even don't have the rights to save ...
3
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0answers
105 views

Is possible to create a shapefile with a specific encoding using ArcObjects?

I have the code to create a shapefile programmatically, something like this 28310 - Create a new empty shapefile programmatically moreover I am able to put the data from a layer in it. It works ...
3
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0answers
1k views

Showing dimensions on polygons in QGIS?

I have a shapefile that contains all of the property parcel lines in King County, WA. We are currently displaying this data through mapbox on our site with no issues. We would like to be able to show (...
3
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0answers
1k views

How to build .vrt of shapefiles?

I've a huge number of shapefiles and I would like to create a VRT as I do with gdalbuilvrt for raster. I find here https://github.com/dwtkns/gdal-cheat-sheet that it should be possible and the format ...
3
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0answers
264 views

Geotagging photos with Point Shape via Time Stamp

I have waypoints which I marked with a GPS device - unfortunately no track/route. And I have photos which I took at the same day. Now I want to interpolate the points to line and use this line to ...
3
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0answers
141 views

QGIS algorithms do not work on copies of shapefiles?

I'm using QGIS 2.6.0. I'm trying to run various algorithms such as "SAGA/Shapes-points/remove duplicates" & "SAGA/Shapes-Grid/Add grid values to points" through the sextant toolbox. When I run ...
3
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0answers
191 views

Lining attributes up with features when creating shapefile using PyShp?

I used the Python Module Pyshp to select particular census blocks from the Census's shapefiles and package these into a single shapefile. However when I add this data into ArcMap and right click to ...
3
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0answers
393 views

What is the area that OGR extracts from the (geometry) shp files for polygons?

The ESRI July 1998 technical documentation for polygon shapefiles at page 10 makes no mention of either area measures or length measures (apart from byte/record-layout matters). Yet OGR enables me to ...
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0answers
140 views

Merge shapefiles to one tool not working?

When using the data management tool "Merge shapefiles to one" in QGIS why is it copying one of my shapefiles instead of merging the two together as it should?
3
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0answers
422 views

Memory layer or QgsVectorFileWriter Error?

Currently this excerpt of code will not save to file (as it is supposed to). The memory layer is visible and editable. Yet even when manually saving the layer, any priorly added features (geometries)...
3
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0answers
694 views

How can you calculate the union/merge two polygons with ogr2ogr?

I want to calculate the union/merge two overlapping polygons using ogr2ogr (as I have 300+ to do). I want the output to be the same as you would get if you used the 'Merge shapefiles to one' command ...
3
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0answers
239 views

R - how to create a pre-determined number of identical square polygons to use for a choropleth map?

I am trying to plot crime data density (again!) over a city map, say of NY. As a well known problem there are plenty of examples on this (http://www.obscureanalytics.com/2012/12/07/visualizing-...

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