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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2answers
12k views

R : convert a spatial polygon objet to spatial polygon data frame

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 ...
13
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3answers
3k 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 ...
13
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4answers
3k views

How to reproject spatial data using free libraries?

How can I use free libraries to transform spatial data? For example, I want to change the projection of a Shapefile within the code of my C# web application. How do I do that?
13
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7answers
21k views

Where can I find a shapefile of city boundaries in the 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.
13
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3answers
1k views

Centralizing shapefile data into database

I've got hundreds of shapefiles from various different GIS projects that I want to start consolidating into a single database platform, currently attempting this with Postgres / PostGIS. Hardly any ...
13
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4answers
519 views

Are long lines in shapefiles to be considered geodesics or straight lines in the 2D latlong space?

Is there a definition on how lines connect vertices in the shapefile format? In the simplest case, imagine a line with only 2 points, from 40,-118 to 40,-112 - that's somewhere random in the US - ...
12
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5answers
475 views

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

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 ...
12
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2answers
29k views

How to crop Shapefiles in QGIS?

I need to clip a large and very detailed .shp file in QGIS showing environmental data similar to a temperature map. Is there something like the very simple crop tool alike in photoshop where you can ...
12
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4answers
57k 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 ...
12
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2answers
4k 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 ...
12
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4answers
19k views

Splitting shapefile into separate shapefiles for each feature using QGIS/GDAL/SAGA?

I have a polyline shapefile with about 20 kinds of roads. I would like to know how can I create automatically a vector file for each one. I am aware of how to do it using ArcGIS for Desktop - see ...
12
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3answers
9k 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....
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2answers
604 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 : ...
11
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5answers
2k views

how can i convert a shapefile to lat and lon boundaries?

i have a shapefile of country subdivisions and i would like to extract an array of bounding lat and lon for each division.. is it possible to do?
11
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4answers
1k views

How to model a graveyard - one point per deceased or one per grave? [closed]

This is a continuation of my previous question about our project on how to economically get away with the implementaion of a graveyard in a GIS system… On the graveyard we can find Regular ...
11
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3answers
15k views

How can I get the proj4 string or EPSG code from a shapefile .prj file? [duplicate]

I have to work with a shapefile defined in an unusual projection, which my GIS software does not know about. How can I get the proj4 definition or the EPSG code for the projection?
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3answers
2k 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 ...
11
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3answers
1k views

Which data format typically displays fastest in ArcMap?

My organization is working on an application running on ArcGIS Engine. Previous versions of the application used primarily Shapefiles for displaying roads, parcels, buildings, etc. Since I was ...
11
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1answer
7k views

Use python to add layers to TOC

I've been battling with adding layers to the TOC for some time now. I have managed to single layers added but need to loop through a folder and add all layers. Shapefiles I cannot get to add at all. ...
10
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5answers
11k 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?
10
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5answers
624 views

Database versus Files for Solo Developer

I'm just getting started in GIS and am interested in using it to create maps of mountain biking trails in my area and nearby. I've been learning QGIS and have made enough progress to generate a decent ...
10
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3answers
15k views

Creating shapefile from lat/long values using ArcPy?

How can I create a shapefile using Python in ArcGIS 10? I have lat & long. From this I need Python code which will create a shapefile in ArcGIS Desktop 10.
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3answers
2k views

Polygon shapefile with null values?

Does anyone know where I can find a sample shapefile that has null entries in it (preferably a polygon shapefile)? I'm not sure how to create one with null entries.
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8answers
7k views

Is there a Free Opensource Shapefile Writer for .NET?

I am looking for a well documented, OpenSource Library that can create and write to a shapefile from .Net. I need lower lever access:i.e. I should be able to write feature by feature. Does such a ...
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5answers
4k views

GeoJSON too bulky - what to do?

I am using leaflet.js to allow web users to select a region. Valid regions are US states, Canadian providences, and world countries (except for US and Canada). I constructed a shapefile myself using ...
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6answers
7k views

ArcGIS 10 creating a shape file from current dataframe extents in layout view

Where is the tool for this? Have looked around and the closet thing i can find is Toolbox's Grid/Strip Map Index tools under Data Drive Pages. I just want to be able to create a single polygon ...
10
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2answers
5k views

Point (of a linestring) within Polygon using ogr and Python

I'm currently working on a project in which I need to build a topological network out of the geometry features I find in shapefiles. So far using Ben Reilly's open source project I've managed to ...
10
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4answers
9k views

using shapely: translating between Polygons and MultiPolygons

[EDIT: the solution to this was simply to use OGR to read shapefiles. See geographika's example.] In an ESRI shapefile, there is no distinction between Polygons and MultiPolygons. Furthermore, there ...
10
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2answers
265 views

Retrieving size of shapefile in ArcPy?

Is it possible to retrieve the size of a shapefile using python and arcpy? If so, how?
10
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4answers
4k 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 ...
10
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2answers
2k 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 ...
10
votes
2answers
1k views

Where did the polygons go after projecting a map in QGIS?

I'm fairly new at GIS know-how, but I've run into a problem with a projection of a world map. I have a shapefile of all countries I downloaded from Natural Earth. After projecting it into a ...
10
votes
3answers
5k views

Divide a complex shape file into a grid

I have a decently detailed shapefile with polygon/multipolygon features (the file is about 500mb). It's actually a shapefile of the entire world, with the features representing coastlines. I need to ...
10
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2answers
4k views

How do dissolve polygons from shapefile using open source tools?

In my current project I'm visualizing data on a map representing some values for each administrative areas of a country. I'm given a shapefile of this country, which I'm converting to GeoJSON for use ...
10
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2answers
2k views

Which Windows GIS editors support the creation of 3D shapefiles besides ArcGIS with 3D Analyst?

I need to find and easy and affordable way to generate 3D linear shapefiles in Windows so one of our users can inspect our tool. We incorrectly assumed that he had 3D shapefile source data available ...
10
votes
1answer
1k views

Conflate (merge) private shapefile data with OSM data

Background Downloaded Alberta OSM data from Geofabrik and have it running on a private Linux server using PostgreSQL 9.1, PostGIS 2.0, Mapnik 2.1.0, osm2pgsql, Apache 2, mod_tile, renderd, and ...
10
votes
2answers
2k views

Shapefile to SVG with ArcMap (while retaining country attributes)

Does anybody know how to export the Natural Earth 1:110m shapefile to SVG with ArcMap while retaining the country attributes? From SVG I'm gonna try to convert it again over to RaphaelJS to achieve ...
10
votes
2answers
327 views

Determine minimum number of polygons from shapefile to cover an area of interest

I have a large number shapefiles representing areas of interest for an analysis that will be conducted using various sources of satellite imagery (IKONOS, RapidEye, etc.). Unfortunately, the imagery ...
9
votes
3answers
1k views

Alternatives to Shapefiles as open-source, cross platform dataset types

I am working on software that is very ESRI oriented, but a future version will likely not be using ESRI software. It uses Shapefiles and Geodatabases. I'm planning on getting all of my data to ...
9
votes
7answers
3k 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 ...
9
votes
3answers
4k views

Order of polygon vertices in general GIS: clockwise or counterclockwise

Two days ago I asked a question about the internal storing order for the vertices of a polygon in ESRI shapefiles. That question was answered (Are polygons stored clockwise or counterclockwise in a ...
9
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5answers
3k 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 ...
9
votes
3answers
4k views

City shapefile for free

I am looking for a simple point shapefile which indicates where the cities of the world are. I cannot seem to find one which is free of charge and meets my requirements. Ive got this one: http://...
9
votes
4answers
7k views

How to change field length in QGIS

I have a shapefile I made in QGIS 1.7.4. One of the fields is a String of length 80. I'd like to make the field accept longer stings, but I can't figure out how to change its length. How do I do this? ...
9
votes
4answers
8k views

Using ogr2ogr to convert GML to shapefile in Python?

I am trying to convert a GML to an ESRI shapefile using ogr2ogr utility in a python script. I have successfully installed the GDAL/OGR package via osgeo but I am now struggling to find/understand ...
9
votes
4answers
34k 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. Thanks in advance.
9
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1answer
18k views

Georeferencing shapefile using ArcGIS for Desktop?

I have a shapefile with some polygons that I would like to superimpose to a raster image, but unfortunately they don't match perfectly due to the reference system the shp has been created with. So, I ...
9
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7answers
15k views

Fixing corrupt shapefile?

I have a shapefile that I was working on in ArcGIS Desktop 9.3 get corrupted somehow and it gives me the error "Number of shapes does not match the number of table records.". What I would want is to ...
9
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4answers
5k views

How to clip LAS data using shapefile polygons and open source software?

I am trying to clip or filter lidar files (las, xyz) using a shapefile that contains multiple polygons. Is there open source software that can do this spatial operation? My las files are enormous, ...
9
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2answers
4k 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 ...