Division or partition of geometric features

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9
votes
0answers
7k views

Splitting feature class by unique values for an attribute/field in ArcGIS for Desktop? [duplicate]

I would like to split a single shapefile into multiple shapefiles by using unique values for one attribute/field to select features for each value out into a new feature class. I found ET Geowizard ...
7
votes
2answers
1k views

Split a feature when intersecting with a feature of another layer using PyQGIS/Python?

I have a buffer layer (green polygon) which I want to split to two polygons whenever it crosses a barrier (blue line). I have been trying to use "splitGeometry" method, but I just can't get it to ...
7
votes
4answers
940 views

Splitting Linestrings on the dateline with OpenLayers

A couple of years ago I posted a questions titled "The International Date Line wrap around" @jdeolive suggested I split the features at the dateLine. So I tried. So when I try to split my satellite ...
7
votes
2answers
2k views

How to split an irregular polygon into equal areas?

I am a surveyor and use QGIS for maintaining soil test records on civil projects and am constantly provided with test lot area or number of lots required. These are more often than not irregular in ...
6
votes
5answers
2k views

How to split OSM roads into individual segments at intersections?

I want to create a road-network for use with pgRouting using OpenStreetMap data. I loaded a shapefile from GeoFabrik into a Postgres table (with PostGIS enabled). However, one problem I had was that ...
6
votes
1answer
141 views

Split polylines in ramps

I have a shapefile (polylines) of some roads and I want to divide the roads in ramps. Ramp = a piece of the road delimited by the top of a hill and a valley. So, pretending that you're driving in ...
6
votes
2answers
1k views

QGIS or Postgis - How to split polylines with a point layer?

In QGIS, I would like to split the polylines in a layer loaded in the workspace with the points in another loaded layer. If a point intersects a polyline, this polyline should be transformed into two ...
5
votes
2answers
2k views

How to Split a vector file into several different files using a Grid in QGIS?

I have a shapefile containing contour for a large area, and I want to split it into different shapefiles each covering a 1KM X 1KM area. I have already created the required Grid shapefile in QGIS. ...
5
votes
2answers
2k views

Split a shapefile into multiple shapefiles based on a particular Field [duplicate]

I have a shapefile where there are 3 fields OBJECTID, NAME , LOCALITY. I want to create new shapefile that contains the geometry, projection etc. of the parent shapefile and according to the locality; ...
5
votes
1answer
828 views

How to split a Polyline Geometry at a certain point in ArcObjects?

I have a polyline geometry and wish to split it into two different geometries, based on a given point on that line, in ArcObjects. I have tried to find out how to do this, but to no avail. I found ...
5
votes
1answer
364 views

How to split a 20 km² OSM file?

I want to create a 3D model of an OSM map using osm2world. Osm2World can render maps of large regions, for example, there is a 3D map of Austria and Germany (generated from OSM). I want to do ...
4
votes
1answer
133 views

How do I split a vector layer into separate grid layers?

I need to split a vector layer into 1km x 1km squares so I can carry out some calculations for these individual areas. Is there a feature to do this?
4
votes
2answers
791 views

Splitting DXF layers into Shapfile layers in QGIS?

When i load a dxf into QGIS all the layers are present in the attribute table. Is it possible to split this "entities" layer in QGIS into its component parts and save each component part as an ...
4
votes
2answers
7k views

How to Split Features in QGIS?

I am new at using QGIS. How can I simply split features in QGIS? The manual tells to simply draw a line through the polygon you want to split. But it doesn't work. The line disappears when finishing ...
4
votes
1answer
262 views

Splitting polygons leaves null values

I'm trying to split polygons with overlaping line features, using Split Polygons tool from Topology toolbar. The problem I encounter is that only one from new polygons have old attributes and others ...
3
votes
2answers
121 views

Converting huge multipolygon to polygons

I have a shapefile with some huge multipolygons, with 100.000's of parts. What would be the easiest way to split them to singlepart polygons? I'm looking for something like QGIS ”Multipart to ...
3
votes
2answers
345 views

How to split lines at vertices in ArcGIS for Desktop with Basic level license?

Is there a way to work around splitting lines at vertices in ArcGIS for Desktop without an Advanced level license? I don't have the advanced license and I have a model that uses this tool. If need ...
3
votes
1answer
78 views

Is it possible to split a polygon inside another one in QGIS simply?

I can split polygon if I put the points of start and end outside the boundaries. How can I do the same if I have a part that I want to split completely inside a polygon. In Arcgis I can do it if the ...
3
votes
3answers
567 views

Is there a Raster Equivalent of the Split tool?

I have the DEM of a State in ERDAS Imagine (.img) format. I have a shapefile containing the counties of that state. I want to split the whole raster into DEMs of the individual counties. The counties ...
3
votes
1answer
217 views

How to represent Typhoon(s) wind speed using Quantum GIS / PostGIS?

I am not completly new to GIS (was taught ArcGIS at Uni) but I would still consider myself (especially compared to all these experts here) a newbie in QGIS or PostGIS. I want to display the ...
3
votes
1answer
331 views

ArcMap 10.1 Python split inconsistent string

I converted a kml file to a feature class. All of the fields from the kml were combined into two fields in the feature class. One of them contains information delimited by "/" and the other contains ...
3
votes
2answers
288 views

How can I turn islands into individual features in QGIS?

I have what seems like a pretty straightforward task in QGIS: I have a shapefile that, in some cases, groups multiple separate landmasses into a single feature. For example, the Hawaiian islands are ...
3
votes
1answer
50 views

Separated, but combined polygons - unable to split. What determines that?

In Mapinfo it works well when splitting polygons if they are physically separated(non-combined). However, occasionally when conducting "multiparts to singleparts" in QGIS, some errors occur, although ...
3
votes
1answer
817 views

Split vector layer by field name

I have a vector layer of 108374 lines I want to split the vector layer into field names of the layer, which is 17. Now, I want to create a new vector layer containing one of the field names e.g. ...
3
votes
1answer
121 views

Split lines at intersections in PostGIS (must be simple but…)

I'm usually closer to my answer than now, but I've looked at all the answers here and couldn't adapt one to work on my data and I'm stuck. I have oriented polylines (Montreal's train network) and ...
3
votes
1answer
46 views

Splitting lines and assigning two new values

It is my understanding that when a line is manually split using the split tool in ArcGIS 10, the geoprocessing follows a create and copy format, meaning that one new feature is created, while the ...
3
votes
1answer
950 views

How do I split polygons that cross the dateline?

I have a dataset of country borders which I obtained from: http://thematicmapping.org/downloads/world_borders.php/ I have that dataset in both shp and SQL, but I'll put out there that I don't feel ...
3
votes
1answer
86 views

Split single line based on the 3D length

so I have a transect line which I already add the z value using the Interpolate Shape. I need to split this line into 100m in 3D length, which due to elevation must be different than 2D. However the ...
2
votes
3answers
855 views

Efficient algorithms to split and join lines?

Referring to the Figure below: How to efficiently join segments into lines? How to efficiently break lines into segments? The above will be applied million times.
2
votes
3answers
213 views

How to generate dartboard shapefiles using ArcGIS for Desktop?

I am rather new to ArcGIS and I have a simple question regarding a problem I cannot fathom. I am attempting to generate a polygon 'dartboard' shapefile. Radially, there should be a circle from 0 to ...
2
votes
1answer
1k views

split features (vector line) problem

Part of a stream is now underground so I'm trying to use split features to break the stream into two pieces. The manual says to select the feature, then the split features icon, then draw a line ...
2
votes
1answer
83 views

I made a Relationship Class(1-M). Its a street X our Address table. I can´t split the street. How to fix it?

I have a table "Addresses" and the Feature "streets". The feature "Streets" are lines. I need to do a relation with this table with this feature. What I do? I tried built a "relationship class". The ...
2
votes
2answers
39 views

Mapping Russia - Int'l dateline splitting polygon

I am having the issue where the International Dateline is splitting a polygon I am working with. I have a layer of the "Federal Districts" of Russia, and the eastern most federal district is being ...
2
votes
1answer
536 views

How to split zAware polyline by points programmatically with C#?

I'm trying to split a polyline by the boundaries of a polygon using IPolyCurve2.SplitAtPoints using C#. The polyline I'm trying to split is zAware and holds elevation values at a regular interval. ...
2
votes
1answer
379 views

Splitting large shapefile into numerous smaller files based on number of objects in each smaller file

I have a shapefile containing approximately 600 000 point-objects. Unfortunately, for a couple of reasons I need to split this file into a larger number of shape-files each containing approximately ...
2
votes
0answers
48 views

How to split a raster into x tiles that overlapped by x km?

I have a raster that I split into three tiles by using the function Split raster in ArcMap as follows: How can I split my raster into three tiles that overlap by 2 km as follows : ?
2
votes
0answers
36 views

Dividing a polygon into two OpenLayers

I'm using OpenLayers to draw a polygon to my users. I want the ability to implement through a line, split the polygon into two, with the cutoff line that the user drew. Does anyone know if this is ...
2
votes
1answer
157 views

Using ST_split to split a line feature using nearby points

I have a line shapefile and a point shapefile, and the line has just one segment and its attribute table, the point shapefile has points near the line above, not on it and the close ...
2
votes
0answers
100 views

Dividing a line into 250m segments

I am currently working on a hydrology project where I am trying to break a stream network into 250m segments. The problem is that the streams are not all adjacent, as I have clipped the NHD file to ...
1
vote
2answers
94 views

Split lines into non-overlapping subsets based on points

Given a table with line geometry, and one or more points that are snapped to this line in a separate table, I would like to split each line with one or more intersecting points at each of the ...
1
vote
2answers
129 views

How to make digitization more detailed afterwards with QGIS?

I digitized already two areas, bordering each other on one side. Than I realized, more detail was needed! What do you suggest as a fast way to do so? Adding each time new dots/verteces takes so ...
1
vote
1answer
34 views

How to get the LineStrings from a MultiLineString

I was wondering if there is a way I can extract the LineStrings from a MultiLinestring object. What I am really trying to do is look into a MultiLineString and see if I have a certain LineString. I ...
1
vote
2answers
96 views

How can I split polygons in the Natural Earth 10m land shapefile?

This problem, that I have also been struggling with, in QGIS 1.7.3 as well. Here are the steps to reproduce the problem: 1)Download Natural Earth 10m land shapefile from original website. *2)*Open ...
1
vote
1answer
85 views

Writing length of line along the line

I sometimes have to write out the length along a line for every couple of hundred meters or kilometers. This applies to pipes, when the construction team wants to know where along the pipe they are or ...
1
vote
1answer
27 views

Split linear features from non-linear in the same feature class

I have a vector layer (Originally a raster layer) of well sites, cut blocks, and seismic lines all lumped together in the same feature class and no distinguishing attribute between them. I want to ...
1
vote
2answers
60 views

Set a split policy/rule on a field without domain in ArcMap

Can you define a split policy or split rule on a field without a domain? When a domain is involved, you can set the default value of the field and chose a rule for when a feature is split or merged. ...
1
vote
1answer
56 views

How to split Polygons by line grid?

I want to split a polygon by a intersecting line into different parts, exactly like in this post(Qgis - Is there a way to split a polygon layer with a line layer?). I have a vector grid to cut the ...
1
vote
1answer
86 views

ET Geotools Split Lines at Vertices Issue

This might seem like a really simple question but for whatever reason I can't figure it out. How do I run the split line tool in ET Geotools on an entire polyline layer? I can do it for a single ...
1
vote
1answer
299 views

Splitting polygons in OpenLayers is not working

I have some WFS layers in OpenLayers, containing Polygons. I try to make a tool to split these polygnos and save them to db. //The layer which I want spliting work on var contract_layer = ...
1
vote
3answers
78 views

Split a layer into a single layer

I have two multi-polygon layers, one a map of land uses, the other borders of administrative areas. I am interested in analyzing the amount of land use in each administrative area, but the polygons ...