Tagged Questions
0
votes
0answers
19 views
NYC Building Perimeter Shapefile after 2011
I've been using the following NYC building perimeter shapefile from the DOTT for some work. This file however dates back to 2010. Is there a newer one available, and if so where?
I have found this ...
7
votes
1answer
103 views
How to rename field names in a shapefile?
I need to rename the field names (attributes) in a shapefile. Is there an easy way to do this from the command line?
0
votes
4answers
157 views
preferred source format for OGR conversion to GeoJSON
I'm relatively new to OGR and GIS in general. Most of the sources I look at give a choice of ESRI shapefile and MapInfo formats. I'm using ogr2ogr to convert these to GeoJSON for import into ...
2
votes
1answer
69 views
OGR - Weird GeomType -2147483645 on polygon shapefile
I am trying to import a shapefile (multipolygon) in an app with ogr but I got an error about invalid geom type. If I inspect the data with ogr like this:
datasource = ogr.Open("c:\\temp\\data.shp")
...
2
votes
1answer
109 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 = ...
2
votes
1answer
74 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 ...
3
votes
1answer
76 views
shapefile batch clip and merge combined
I have two shapefiles, one is polyline, the other polygon. For each polygon I would like to clip the polyline vectors inside. Using arcpy I already found part of a possible solution: ...
3
votes
1answer
470 views
How do you open shapefiles with ogr2ogr
I'm following along the D3 tutorial, and on this line:
ogr2ogr \
-f GeoJSON \
-where "adm0_a3 IN ('GBR', 'IRL')" \
subunits.json \
ne_10m_admin_0_map_subunits.shp
run into the following ...
4
votes
2answers
189 views
How do I Capture GDAL projection and create matching output (OGR or GDAL) shape files?
Working in C++, using GDAL and OGR: Depending on what the user has supplied for image input, I need to output point (or other) shape files in the same projection as the input raster images. The ...
2
votes
1answer
170 views
How to bulk delete shapefile columns?
I have shape-file with next attribute table:
- name of features, unique number for each feature of layer
I must split shape-file by NAME field, but in result in attribute tables of layers should be ...
5
votes
1answer
497 views
OGR Shapefile to CSV: Using Python to get WKT for multipart Polys.
Using ogr2ogr and python, I'm running into a wall with trying to create a csv with WKTs for a shapefile that contains multipart polygons. Currently this is this code I'm using (found it on interweb):
...
3
votes
2answers
546 views
Shape-file encoding problem in QGIS 1.9.0 (built with GDAL 1.9.2)
I have googled a lot but failed to find the answer.
My configuration is:
Ubuntu 11.10
Quantum GIS - 1.9.0-Master 'Master' (caae7b7)
GDAL 1.9.2, released 2012/10/08
Shape-files refuse to open in ...
1
vote
2answers
186 views
How to use -where SQL in an ogr2ogr loop in GDAL/OGR (bash)?
I'm using the following code:
while read line; do
for att in $line; do
ogr2ogr -where "newcode='$att'" -f "ESRI Shapefile" $OUTPUT/$att.shp $INDATA
done
done < $SCRIPT/newcodes.txt
The text file ...
3
votes
1answer
350 views
How to programatically populate a shapefile field with polygon areas in OGR?
I'm trying to programatically populate a shp field with polygon areas:
import sys
import ogr
ds = ogr.Open( 'tttttttttt.shp', update = 1 )
if ds is None:
print "Open failed./n"
sys.exit( 1 ...
2
votes
3answers
294 views
How to merge a large amount of polygon-features in a script?
We have a very large shapefile with over 30000 features and want to merge it with a script on a server. Currently we try it with QGIS, but the processing takes way too much time.
Is there a way to do ...
3
votes
1answer
145 views
Is there no EPSG code to use for Behrmann equal-area projection in ogr2ogr?
I'm trying to use ogr2ogr to reproject some shapefiles. The projection I wish to use is Behrmann equal-area. I cannot find an EPSG code to use for the '-t_srs' part of the syntax. Is there any way ...
3
votes
1answer
135 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 ...
1
vote
3answers
219 views
Getting Field value for a given coordinate out of ESRI Shapefile using GDAL/OGR
I have a bunch of ESRI shapefiles that contain Land Cover data across Canada (provided by Geobase). I need to query the files and obtain the value of a certain field (called COVTYPE) in a given ...
3
votes
2answers
230 views
Eliminate small polygons from shapefile
I downloaded GTOPO30 *.DEM files, and extracted a contour line at 2000m altitude using gdal_contour. In the resulting shapefile, I have many small polygons in areas where the altitude is close to that ...
9
votes
3answers
2k 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 ...
1
vote
0answers
190 views
ogr2ogr failed to reproject shapefile error exceeds limits
I cannot get correct transformation from WGS84 to the Hungarian EOV EPSG:23700 (Hungarian Datum 72) using ogr2ogr.
I am using ogr2ogr from the fwtools shell. I have a shapefile in GCS WGS84 (epsg ...
3
votes
1answer
706 views
Convert KML to shapefile without losing attribute data
So I want to convert KML files to SHP shapefiles to load it onto PostGIS. Currently I'm using ogr2ogr to do the conversion for me, but it wipes out all the attribute data. How do i preserve this ...
9
votes
2answers
1k 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 ...
8
votes
4answers
845 views
Is there a mapping between OGR and python data types?
I'm writing a shapefile using OGR in python, creating fields on-the-fly from a python data source. Creation of a new field requires an OGR data type, is there a mapping between OGR and python data ...
4
votes
2answers
607 views
How to cut a shape file?
I want to use a shape file of the Corine Land Cover. This covers all of Europe, but I am only interested in the area of Scandinavia.
How can I cut this file using free software (preferably a ...
6
votes
1answer
986 views
How to convert Shapefile geometries to WKB using OGR?
I got the geometry of a feature of the shapefile, and i want to save that geometry in the postgis (in WKB formats like it happens when we import shapefiles using shp2pgsql and psql commands). How do I ...
3
votes
1answer
240 views
Polygon Shared Boundaries in GML
Last week I was told on a phone conference that GML supports shared boundaries in Polygon's. I have been unable to find any documenatation to substantiate the claim. Here is the situation:
I have a ...
19
votes
2answers
1k views
Python Efficiency — Need suggestions about how to use OGR and Shapely in more efficient way
I'm looking for some suggestions about how to make my python code more efficient. Normally efficiency doesn't matter for me but I am now working with a text file of US locations with over 1.5 million ...
11
votes
7answers
2k views
Free tool to simplify parcel shapefiles?
Is there any tool available which let's me run millions of parcel shapefiles and simplify them?
1
vote
4answers
2k views
ogr2ogr, convert from shp to postgis error
I am trying to import a shapefile into PostGIS using the ogr2ogr tools that are built into the FWTools package. In my import process I am receiving an error that I don't know how to deal with.
ERROR ...
1
vote
2answers
877 views
ogr2ogr srs options: where is the well known definition determined?
In the ogr2ogr documentation it says that when using -a_srs srs_def:
Srs_def can be a full WKT definition (hard to escape properly), or a well known definition (ie. EPSG:4326) or a file with a WKT ...
2
votes
2answers
173 views
Project geometry features upside down
I have shapefiles containing polygons and lines that are used in a mapfile for projecting them through Mapserver. Is there a way in changing the projection of the layers by 180 degrees(i.e. upside ...
12
votes
4answers
4k views
How to add an attribute field to an existing Shapefile via Python
I have a Python script that adds an attribute field to a Shapefile if doesn't exist. This is easy to do with ArcGIS (graphically or via Python), but I'm looking for something that doesn't depend on ...
4
votes
2answers
771 views
create temporary point geometry feature from coordinates in OGR with Python
I have two shapefiles containing two types of geometry features: one contains polygons and the other linestrings.
Because I'd like to use the Within method to check whether the end(or start) of a ...
10
votes
2answers
3k 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 ...
7
votes
3answers
2k views
How To Convert A Set of ARC/Info ASCII .e00, .e01, .e02, etc Files Into .shp Files
I have a set files that I downloaded with extensions (.e00, .e01, .e02, etc). I have read that these are files used by ARC Info mainly, but I do not have ARC and nor am I really that interested in ...
7
votes
4answers
1k 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?
10
votes
2answers
1k views
How to add custom Feature attributes to ESRI Shapefile with Python?
I am seeking a way to take an existing ESRI 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 ...
