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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2
votes
2answers
808 views

How to calculate area in sq km of an ellipsoid shapefile

In QGIS, I often find myself setting up projects with an ellipsoid coordinate system (e.g. WGS84) so that the resulting maps have lat lon scales, etc. Often in these projects I also need to do some ...
0
votes
1answer
215 views

Saving part of OSM shapefile in QGIS as GeoJSON strips 'name' field to 25 characters long [duplicate]

I want to copy part of OSM data in ESRI Shapefile (downloaded from http://download.geofabrik.de/europe/ukraine.html ) and save in in GeoJSON to style later in Tilemill. After saving, I see that ...
1
vote
1answer
130 views

BBox missing when converting TIGER to GeoJSON

I can't get the bounding boxes of polygons if TIGER/Line shape files when converting them to GeoJSON using FWTools. The other default information is present and there is no difference between the ...
0
votes
1answer
171 views

Correlation and terrain databases [duplicate]

I would like to know what kind of computation I could perform on a terrain database. I'm making terrain for VBS2 from raw data (shp files and DTM Elevation files) and then I'd like to be able to check ...
2
votes
2answers
1k views

GeoJSON to Shape file conversion with geotools

Can someone please provide me an example of how to convert GeoJSON to Shape file using geotools?
1
vote
0answers
182 views

Join .csv file and .shp of georeferenced points

I have georeferenced a map and saved a selection of some points on the map. These points are cities of departure and arrival and I want to join the .shp with a and excel .csv with the information of ...
1
vote
0answers
177 views

How can I add data to a shp file attribute table from arcobjects?

I have a code that selects row data from a listview table in VB.net. I have declared that data as a variable and I can see it if I ask it to dispay a message box (see code below). Now I would like to ...
5
votes
1answer
1k views

Using ArcPy to batch merge based on shapefile name?

ArcGIS 10 SP4 Python 2.6.5 I have quite a few shapefiles that are in many different directories. I'd like to pull out groups of like shapefiles, merge them, and move the results into a FGDB. I've ...
1
vote
3answers
105 views

Trying to match delimited text layer to my shapefile

I'm pretty new to QGIS and having a bit of trouble getting a text layer to match my shapefile. I'm trying to plot Canadian cities on a shapefile I have of Canada provinces. The provinces shapefile is ...
1
vote
1answer
1k views

Why does Add Field to Layer File give “ERROR 000840: The value is not a Feature Layer”?

I'm trying to add a field to a layer file, but it always gives an error. What I did was making a closest facility layer and save the result as a layer and after that I tried to add a field, but then ...
1
vote
1answer
85 views

Is there a way to traverse and select all vectors connected to a starting vector?

Preferably using QGis I'd like to remove errors from a road network .shp file and was wondering if there was a away to perform a flood fill or traversal on a vector layer to select all connected ...
4
votes
1answer
405 views

How to determine correlation between two databases?

I need to perform some tests and verifications on databases and/or datasets. I need for example to analyze two databases and then determine if there is enough correlation between both. My main issue ...
3
votes
1answer
180 views

Shapefile and geocoding to retrieve an area name

I'm very new to GIS and all things geospatial! I have dbf, prj, sbn, sbx, shp and shx files that have been provided to me. The shapefile contains information on parts of the country that have been ...
2
votes
1answer
732 views

Problem to clip a raster with a shapefile

I need to clip a rasterlayer with a vector layer. When I try this, the following error appears: **ERROR 1: Attempt to create 0x0 dataset is illegal,sizes must be larger than zero.** What am I ...
1
vote
1answer
1k views

How to create a 3D shapefile from a raster?

I´m trying to make a 3D shapefile from a raster feature but not working. Tried already to run the command in OSGeo4W but nothing happen. I'm using the Qgis 1.8.0 Lisboa. The purpose is to get a final ...
1
vote
1answer
853 views

Unable to load Shapefile using pgShapeloader / shp2pgsql-gui (pgAdmin3's PostGIS Shapefile Import/Export Tool)

I am trying to load a shapefile (http://dds.cr.usgs.gov/pub/data/nationalatlas/statesp020_nt00032.tar.gz) into PostGIS 2.0.1 using pgAdmin3's PostGIS Shapefile Import/Export Tool. However its not ...
5
votes
3answers
7k views

How do I add my own map layers to Leaflet

I have a Leaflet map and want to add two of my own small polygon layers (currently in shapefile format, but they could be converted to GeoJSON). Can this be done without a mapserver to publish them ...
2
votes
2answers
545 views

What's the correct transformation for Lambert Conformal Conic for Wyoming?

I am a newb in QGIS. I have loaded QGIS 1.8 (Lisboa) and practicing with a number of maps for portions of the state of Wyoming. My maps are mostly in UTM 12N NAD 27 & NAD 83 some are in decimal ...
5
votes
1answer
2k views

better way to duplicate a layer using ogr in python?

I'm splitting a large shapefile into many smaller ones using ogr. I'd like to just copy all of the field and layer config information from the original. Here's how I'm doing it now: src = ogr.Open('...
0
votes
1answer
193 views

Problem with encoding of CSV and SHP files in Linux

I am new to using QGIS. I came up against the encoding issue of shp files. This solution to solved my problem in Windows (for source I had to put windows-1253 instead of utf-8) My question is what ...
4
votes
0answers
465 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....
4
votes
3answers
834 views

In an ESRI Shapefile, what is the “Record Number” field of each record header in the .shp file?

The shapefile specification (http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf) only says "Record numbers begin at 1." (page 5), which doesn't specify what the field actually is. As per page ...
4
votes
2answers
2k views

PyQgis overwrite shape file and adding layer to Qgis

I am creating a shapefile in python by: driver = ogr.GetDriverByName('ESRI Shapefile') datasource = driver.CreateDataSource('c:/temp/toke2.shp') layer = datasource.CreateLayer('layerName',geom_type=...
2
votes
1answer
339 views

How to fix distortions for Baden-Württemberg?

I'm working in an area in Baden-Württemberg, Germany. I loaded some OSM data in QGIS but the map display is distorted. I tried ftools define projection with many different projections but nothing ...
0
votes
0answers
218 views

Help in GRASS/QGIS/Python

I have Idea about ArcGIS, and a bit of QGIS and zero programming knowledge, which I am trying for thesedays. I saw GRASS GIS and have started working with shapefiles, which are not being loaded... :( ...
-1
votes
2answers
246 views

styles when merging shapefiles in qgis

Trying to create something for mapstory.org It wants it in all one shapefile. So I create a polygons and lines (with time attributes) in qgis 1.8 Then merge them all into one shapefile, how can you ...
1
vote
2answers
864 views

How to convert OSM data to a projected Coordinate system

What is the easiest way to get OSM data into a shapefile projected data format for QGIS? Sounds simple but I've run into problems with this before.
19
votes
2answers
15k views

How can I get a shapefile from a postgis query?

My data is in a PostGIS database. I would like to generate a shapefile from a query. How can I do that?
11
votes
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?
0
votes
0answers
47 views

Convert Shp to Dxf with QGIS [duplicate]

8.0. I have asked this before and seen similar but not the same (all of which I Have not got an answer to so not a duplicate). But is there a way to export a shp as a dxf so that it will not crash ...
5
votes
3answers
347 views

GIS file format for space and time data?

I need some advice with GIS file format choice. Here is my problem: I have about 100 stations. At each station water temperature is measured daily for 1 year I want to load this data to QGIS and be ...
1
vote
2answers
792 views

Where can I download Southern California Interstate Highway System in a Shapefile?

Does anybody know where I can download the Interstate highway system (as a shapefile) for Southern California (the area around San Diego in particular)? Thanks, in advance!
4
votes
5answers
3k views

Counting road intersections and blocks

I have a shp file that consists of the road system of Mexico City. I would like to count the number of road intersections (crossings) and blocks (which I would define as a segment starting from one ...
1
vote
3answers
872 views

Looking for a simple method to find the shortest path with Shapefiles

I am having shapefiles for a particular map location, the shapefile consists of points and polylines. Now I want to find the shortest path between the points. What is perfect and simple method to find ...
4
votes
2answers
9k views

How to convert a shapefile to WKT?

I'm trying to convert a shapefile into the simple Well Known Text (WKT) format in the example below (from http://en.wikipedia.org/wiki/Well-known_text). MULTIPOLYGON (((40 40, 20 45, 45 30, 40 40)), (...
1
vote
1answer
255 views

Natural Earth: How to get the position of all provinces that belong to a state

This question is about Natural earth 1:10 states and provinces.shp file. I'm using ogr2ogr and want to know the name of the id i need to pass . In purpose of pulling out the right states regions. ...
3
votes
1answer
1k views

“Topo to Raster” tool for QGIS?

is there any analogue of the ArcGIS "topo to raster" tool in QGIS? I need to creates surfaces from shp for some cases from points and for some from lines and this instrument is very convenient.
1
vote
0answers
61 views

Where to find Data with site that have hazardous, toxic or radioactive substances?

Does anybody know where to find data that lists the location of sites that have hazardous, toxic or radioactive substances? I'm working on a HUD project and need to be able to find out if sites for ...
5
votes
3answers
492 views

How to combine stacked polygons within a shapefile?

The image below shows my shp-file. Every polygon has the same transparent color. So a darker blue means, that several polygons are stacked! How do I cut every polygon with each other so no polygons ...
3
votes
1answer
5k views

ESRI Javascript API Export to Shapefile and CSV

I am working on a Javascript Web Application using the ESRI Javascript API v3.3. My application allows the user to edit and query data and also provides a table for attributes. I would like the user ...
2
votes
1answer
613 views

need help for script checking topology using ogr in python

My main goal is to create a new feature indicating if the line features intersect each other as well as if they are not connected to a feature. My problem is how to identify the intersecting and not ...
2
votes
2answers
559 views

Displaying multiple regions shapefiles on iOS device?

How can I display multiple shapefiles on an iOS device? My client is asking to display all the states in a different color, and again cities in a different color and all the fields in a different ...
4
votes
2answers
825 views

How to cut a SHP based on another SHP using R

I have a Shapefile of points with certain information. I have another Shapefile with polygons corresponding to the states of the country I am working with (in this case Mexico). Since I only want to ...
3
votes
1answer
542 views

R: How can I create a polygon from several polygons and a line?

I have some spatial objects that I want to combine, namely three polygons and a line. The ultimate goal is to create a polygon that I can overlay on an area of a map of administrative divisions of the ...
1
vote
1answer
313 views

Global Mapper - .SP1 conversion to Shapefile

Does anyone know how to convert an .SP1 file to an shapefile from Global Mapper to ArcView 10.1? The .SP1 is a GPX file.
1
vote
1answer
65 views

why sql file generated by postgis was different in notepad and pgAdminIII?

When i imported a shapefile which contains some polygons into PostGIS by command line on Win 7, a problem puzzled me: The sql file generated by shp2pgsql opened with notePad has the geom (...
1
vote
0answers
55 views

How to remove polygons in shapefile based on attributes in R [duplicate]

I have a shapefile where some attribute data is blank. I can delete those rows attribute table using na.omit. However, the polygons remain when I map the shapefile. I'm using R to make these changes. ...
3
votes
2answers
2k views

How to overwrite a Shapefile

I want to be able to overwrite a shapefile if it exists. I think my code needs some tweaking. I am using v10. I am able to delete the actual .shp file but the .dbf, .shx, etc still remain, so if I try ...
0
votes
2answers
286 views

loading CanVec directory full of .shp files

I'm totally new to QGIS, and trying to view a Canadian Topo map as published on an iMac - I don't want to change it. http://www.geogratis.ca/geogratis/en/option/select.do?id=5460AA9D-54CD-8349-C95E-...
3
votes
0answers
126 views

QGIS Workflow Problem [closed]

I have 3 SpatiaLite layers (one without geometry but with fields that need to be filtered, one with points and one with polygons, both without any non-geometry fields) that need to be combined to a ...