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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20
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6answers
15k views

How to improve rendering performance of a very large shapefile?

I have a polygon shapefile that has a 100MB .dbf, and 500MB .shp file component. The reason it is so large, is that it is classified as a landbase for a whole district. Everytime I view the file in ...
20
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2answers
34k views

Adding shapefile or feature class as layer in ArcGIS Desktop using Python/ArcPy?

I am trying to automate various tasks in ArcGIS Desktop (using ArcMap generally) with Python, and I keep needing a way to add a shapefile to the current map. (And then do stuff to it, but that's ...
20
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1answer
5k views

How to rename field names in a shapefile from the commandline?

I need to rename the field names (attributes) in a shapefile. Is there an easy way to do this from the command line?
20
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2answers
16k views

API documentation for Gdal/Ogr with C#

I want to assign projection to shapefile in my web C# application, for this i am using Gdal/OGR/OSR C# bindings and add osr_csharp.dll and ogr_csharp.dll references. But i am facing some difficulty ...
19
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4answers
28k views

Exporting shapefile to PostGIS database in QGIS [closed]

How do I export a vector shapefile to PostGIS database? I am asking what format I have to export it.
19
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5answers
14k views

Getting list of distinct values from shapefile field using QGIS?

I have a shapefile whose features I can filter by specifying a where clause in the query dialogue. F.x. I have a field named 'city_name' and by stating 'city_name = "London"' in the where clause only ...
19
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4answers
7k views

How to stop writeOGR from abbreviating Field Names when using “ESRI Shapefile” driver

I'm currently using the following script to add some attribute data from a table to lots of individual shapefiles: library(rgdal) specieslist <- read.csv("SpeciesList1.txt", header=F) attdata <-...
18
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7answers
20k views

How to change the order of features in a shapefile?

I have a shapefile and I want to change the order of the features. Is that possible? I want to sort the features in the shapefile because I'm embedding this shapefile in a mobile app. The app will ...
18
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5answers
35k views

Converting osm file to shapefile (or data frame) in R

I was looking for a road shapefile for Australia today. I ended up going to Geofabrik. Open Street Map has data in .osm format. But they do not have one in .shp for Australia. If possible, I want to ...
18
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2answers
25k views

Convert a spatial polygon object to data frame using R

My goal is to modify an existing shapefile by merging certain polygons. After importing the shapefile and using the UnionSpatialPolygons command, I get the polygon outline that I want. However, this ...
18
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9answers
8k views

how to overlay shapefile and raster?

I have a shapefile with polygons. And I have a global raster file. I want to overlay the shapefile's polygons onto the raster grid and calculate the mean raster value for each polygon. How can I do ...
18
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4answers
71k views

Opening and extracting data from Shapefiles?

We are in need of US highway data. We found it for Florida at the state GIS website. We downloaded the data for Florida highway intersections from here (this is a zip file). How do we use these ...
18
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2answers
19k views

Converting from Geography to Geometry data type in PostGIS?

I have a shapefile that has geography types. Can I convert it with a tool like shp2pgsql or is there a postgis function to do that?
18
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8answers
44k views

Seeking shapefile of city boundaries in US?

Where can I find a shapefile that contains boundaries for the major cities in the United States? I have tried the census website but could not find anything.
17
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4answers
43k views

How do I load a .dbf file into QGIS?

I want to use QGIS to extract lat/lng data from the vertices of polygons. There are about 400 polygons, each with maybe 200 vertices. I am having trouble with step one, getting the data into QGIS. ...
17
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6answers
44k views

Plot shapefile with matplotlib

I am trying to read a shapefile and plot it using matplotlib. Here is the code: import matplotlib.pyplot as plt import shapefile shpFilePath = "D:\test.shp" listx=[] listy=[] test = shapefile....
17
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2answers
10k views

Get field names of shapefiles using GDAL

I use GDAL in Python for importing shapefile. I want to know the field names for the file, my current way is: fields = [] for i in range(1, layer.GetFeature(0).GetFieldCount()): field = layer....
17
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4answers
40k views

Where can I download the Google Road network as shapefile?

Is there any site from where I can get Google Road network as shapefile? As per my knowledge It is not distributed by google. So anybody can suggest how can I create this road network for a custom use?...
17
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1answer
11k views

Selecting features by attributes using ogr2ogr?

I am writing a shapefile after some processing; however, in the final step I need to do some selection by attributes from the the shapefile. I am using the command in a shell with the aim of using it ...
17
votes
1answer
1k views

The next big thing in standardized spatial data exchange format?

I remember reading something a few months back, in the latter half of 2012, about a coordinated group effort to design a new standard for sharing geographic / spatial data. It has or aims to have the ...
17
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4answers
5k views

Is starting names with numbers a bad data naming convention?

My company uses ArcGIS and has a project and data file naming standards in place and (for the most part) followed. Something that has always bothered me about he naming standards is that it mandates ...
17
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3answers
14k views

How to create a GeoJSON that works with D3?

I'm simply trying to convert a .shp file to a geoJSON format using: ogr2ogr -f geoJSON output.json input.shp After executing the command nothing seems to be wrong. Here's an excerpt from the output....
17
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1answer
783 views

Query OSM for all beaches facing west? - QGIS preferred

I want to identify all beaches on this planet (or a given subset of it) that are facing westwards (+/- 20-30 degrees). My idea is to use OSM as the data source. Extracting all polygons that have the ...
16
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4answers
5k views

Python module to delete SHP features (without Desktop GIS installed)

I have a piece of software (not Arc) that runs nightly on a non-production machine which updates shapefile features from an external database. Periodically I would like to delete all of the features ...
16
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7answers
7k views

Free tool to simplify parcel shapefiles?

Is there any tool available which let's me run millions of parcel shapefiles and simplify them?
16
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2answers
642 views

Can colon (“:”) character be used in shapefile field names?

I am trying to find out if the : character is allowed in the name of ESRI's shapefile field. I googled, but I couldn't find an answer. Here is an interesting quote from the article from ESRI FAQ ...
16
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5answers
57k views

Looking for free Shapefile editors

I want to create and edit Shapefiles for my application, and I'm looking for a free shape (ESRI) file editor - free for creating and editing.
16
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1answer
30k views

Converting a polygon into a raster using R

I'm trying to convert a shapefile into a raster within R. My approach is to read in the raster as follows: library(rgdal) # Loads SP package by default demo <- readOGR('F:/data/', 'shapefile') # ...
16
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2answers
10k views

How to add custom Feature attributes to Shapefile using Python?

I am seeking a way to take an existing Shapefile that has a Feature set of 200 countries. Each country Feature has an attribute of "NAME." My objective is to create a Python script that adds an ...
16
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2answers
794 views

How to clean such a bad shapefile for routing?

I am trying to clean a shapefile to make it usable for routing with pgrouting, postgis, postgresql. Here an intersection, it seems to be connected but when we zoom …. It is not: Same here : Here ...
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5answers
3k views

Does Re-Projecting ShapeFile only update content of *.prj file?

If I wish to change the projection of some shapefiles from .. let's say NAD83 (4269) to WGS84 (4326) ... and by using some 3rd party app .... does this mean the .prj file is only updated .. and not ...
15
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2answers
30k views

How to convert data from a .gdb into a shapefile without ArcMap?

I have a .gdb folder with LOCK Files, FREELIST Files, ATX Files, GDBINDEXES Files, GDBTABLE Files, GDBTABLEX Files and, SPX Files. I want to convert the parcel data within this folder into a ...
15
votes
2answers
12k views

How to split non-contiguous feature in QGIS?

I have a shapefile with a feature that is non-contiguous. I want to split the areas on the left from the area on the right. However, QGIS's Split Features tool requires you to draw a line over the ...
15
votes
6answers
9k views

Automate SHP to JPG creation

Does anyone know of a way to batch convert shapefiles to jpegs or another common image format? edit: I should have clarified that I would like to apply a styling to each shapefile, and then export ...
15
votes
3answers
8k views

Is there a public shapefile with the London Underground stations and lines?

Is there a public shapefile containing the stations and lines of the London Underground? I've been doing some intensive searching but I can only find the coordinates of the stations, or the lines in ...
15
votes
4answers
9k views

How to avoid creating corrupt Shapefiles during Editing?

I have one of my GIS technicians digitizing some lines in QGIS in shapefile format. I don't know how he did it (and neither does he), but somehow the shapefile became corrupt. It was creating random ...
15
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2answers
7k views

Is there a standard for the specification of .prj files?

We use shape files for data exchange. I've looked at the .prj files: different programs produce different prj files. Is there a standard how the parameters must be specified in a prj file? AFAIK the ...
15
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8answers
11k views

Shapefile layers in QGIS don't display unless I zoom out

I have two shapefile layers in a Qgis project that have problems with zooming. One is a line I copied/pasted in a new layer from a set of height contours and the other one is a polygon layer I created ...
14
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3answers
7k views

Inverting Polygons using QGIS?

I have a Shapefile with Polygon features representing the world's land areas (continents, islands). Is it possible to invert these, and get a geometry that represents the world's oceans and seas? ...
14
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2answers
4k views

Ortho Projection produces artifacts

I`m trying to create a sphere-like view using qgis and the "world from space"-projection http://spatialreference.org/ref/sr-org/6980/ (essentialy an ortho-projection). ArcGIS wraps the shapes ...
14
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6answers
2k views

Creating simple image from vector data

Can anyone suggest a quick (and preferably open source) way to create an image from a shapefile. For example, I have a shapefile containing parcel boundaries, I want to create a png file depicting ...
14
votes
2answers
31k views

Choosing the correct value for proj4string for shapefile reading in R?

I am having a shapefile of polygons and another CSV file which contains a list of points as (Lat, Lng) pairs.. I want to check for each (lat, lng) pair from the CSV file which polygon does it fall ...
14
votes
1answer
15k views

Import a shapefile to postgis with ogr2ogr gives: Unable to open datasource

I want to use ogr2ogr in order to import a shapefile in a postgis database. I have successfully installed ogr2ogr and I run from the pgsql the following command: ogr2ogr -f "PostgreSQL" PG:"host=...
14
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4answers
24k views

Importing .shp to PostgreSQL?

I want to import a shp file to postgreSQL. First I create sql file and then run PostgreSQL. To create sql file, I run this command in windows cmd: shp2pgsql -s 4326 worldCountries.shp worldcountries ...
14
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3answers
2k views

How can I represent distance using the dashes or markers of a vector line?

I am a very basic user and dont know the lingo to get to the gist of my question so some background might help. Ive volunteered to create a pre-incident planning system for my rural fire department. ...
14
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4answers
7k views

What is the best way to programmatically convert between WKT and Proj4 string?

Some shapefiles have a .prj file associated with it, and the .prj file contains the projection info of the shapefile in the format of WKT. Sometimes I need to convert WKT to proj4 string, and ...
13
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5answers
605 views

What in-depth spatial database systems tutorials exist? [closed]

Is there a good tutorial that explains in depth the internals of a GIS and a spatial database system such as PostGIS with examples and without any background assumption? I'm specifically looking for ...
13
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10answers
69k views

Where can I find Canadian postal code geometries?

Where can I find the shapefiles for Canadian postal codes?
13
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3answers
45k views

Check if a point falls within a multipolygon with Python

I have tried several examples of code using libraries such as shapefile, fiona, and ogr to attempt to check whether a point (x, y) falls within the boundaries of a multipolygon created with ArcMap (...
13
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3answers
30k views

Extract Raster from Raster using Polygon shapefile in R

I am new to R and using the raster package. I have a problem extracting polygons from an existing raster file. If I use extract(raster, poly_shape) function on the raster it always creates a list ...

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