Questions tagged [multipart]

A digital representation of a place or thing that has more than one part but is defined as one feature because it references one set of attributes.

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8
votes
1answer
9k views

Converting selected multipart features to single parts in QGIS

I'm looking for a way to convert one or many selected multipart feature to different single part features without recreating another layer, the way Arcgis allow a user to select a multipart feature ...
3
votes
2answers
3k views

Merge single points to multi point geometry

Is it possible to transform a point shapefile in single part geometry to a shapefile with multi-point geometry based on an attribute. e.g. in the file are 50.000 records in 700 categories, now I want ...
1
vote
2answers
339 views

Can one row in an attribute table be linked to many separate polygons?

Can one row in an attribute table be linked to many separate polygons? I did a series of selects, buffer, intersects on some shapefiles and my resulting table has for one row many polygons. Can this ...
1
vote
0answers
32 views

Merge without dissolve in ArcGIS for Desktop? [duplicate]

I am trying to merge several polygons in a feature dataset into one. Normally I would use a simple merge but the issue is that merge automatically dissolves. I on the other hand want to have them all ...
0
votes
1answer
1k views

How to implement close Popup for Multipolygon?

I am closing the popup for geoJson (layer.closePopup()) to make a modal to appear. The function works fine for regular geometry but fails for Multipolygon. I get the error - ClosePopup is not a ...
2
votes
2answers
1k views

Selecting MultiPart Polygons if there are buildings in at least two of the parts

my data situation: shape of polygons (some are MultiPart Poylgons) shape of building locations (Points) What I need: Select all polygons that have two ore more parts and contain one building or more ...
2
votes
1answer
119 views

Dissolving features to only have multiparts when they are within 100 feet of one another

I want to have a selection of parcels that is dissolved by land owner and within 3 miles of a polyline. If the same owner owns parcels on opposite sides of a road (within 100 feet or so), I want the ...
3
votes
1answer
166 views

Dissolve singlepart features into multipart based on another polygon?

I'm working on generating a water feature layer that eliminates a lot of the swamp/marsh areas in my county. Using raster analysis (iso unsupervised cluster, majority filter, boundary clean, etc) and ...
1
vote
1answer
2k views

How to split polygon features using an overlaid polygon layer in QGIS?

I have a polygon layer (pictured below) that I made by vectorizing a clip from the USDA Cropland Data Layer. The low resolution of the USDA layer causes fields that are separated by narrow roads to "...
1
vote
2answers
613 views

Split multipart shapefile into separate shapefiles [closed]

I have a multipart shapefile, which I would like to split into many individual shapefiles (by FID for example). Is there some way to do this in ArcGIS 10.x without using python?
3
votes
1answer
832 views

Is there a way to create multipart from singlepart features based on selected features only?

QGIS has a tool for creating multipart features in the Geometry Tools section. However, this is applied to a whole layer, which leads to the yellow selection in the image below when used (selecting ...
1
vote
1answer
231 views

Using multi-part line features in network analysis?

Cartographically is there any reason why (pro / con) multi-part line features should not be used when developing road networks for ArcGIS Network Analyst? For example, say I have a road which is 100 ...
2
votes
1answer
405 views

ST_LineMerge doesn't return LineString

I want to create a LINESTRING from a MULTILINESTRING. However in the following case ST_MultiLineString is returned: Select ST_GeometryType(ST_LineMerge(ST_AsText(' MULTILINESTRING( (-70.52570888 -33....
1
vote
1answer
1k views

Exploding multipart features in qgis using python [duplicate]

I want to explode a multipart layer to singlepart in python. I see through the qgis gui there is a way to do it under vector--geometry--tools--Multipart to Singleparts.. which does what I need, I just ...
2
votes
1answer
5k views

Converting multipoint geometry to ONE single point using ArcGIS Desktop?

I have an ArcGIS file geodatabase with two featureClasses. One is a point featureClass which represents the centroids of the cells of a regular grid. The second represents the corners of each grid ...
4
votes
2answers
431 views

How to extract nodes with PostGIS to a multipoint geometry

I have a line in a PostGIS table test_line. I want to extract it's nodes into a multipoint geometry. I tried the following: SELECT ST_Collect((ST_DumpPoints(the_geom)).geom) FROM test_line; But it ...
2
votes
1answer
723 views

How to merge single polygons to multi part polygons by maximum distances?

I have a polygon layer with a land-use class and ID for every polygon. How can I merge polygons (into multi part polygon) which do not adjoin, but are not further than x meters apart from each other. ...
6
votes
1answer
5k views

“Singleparts to multipart” vs. “Dissolve”

It seems to me that the vector tools "Singleparts to multipart" and "Dissolve" do the same things. Can someone confirm this, please? Or do I overlook something?
3
votes
1answer
2k views

Discover multipart features in a layer in QGIS

I am trying to identify multipart features using QGIS version is 1.8.0. I've tried: look at the attributes table select a random feature and check in the canvas if there are multiple geometries ...
3
votes
2answers
1k views

Converting adjacent singlepart polygons to multipart? [duplicate]

I am interested in converting a polygon featureclass created via Create Fishnet (Data Management) from singleparts to multipart. QGIS has a very handy tool called singleparts to multipart that does ...
5
votes
1answer
469 views

Changing order of parts in multipart geometry using ArcGIS for Desktop (or ArcPy)?

Is it possible in ArcGIS to change order of the parts in multipart geometry? In the context menu i founded "insert before" , "insert after" but it never comes active ... or is it possible via python?...
5
votes
1answer
546 views

Creating Multipart Line from coordinate pair lists using Geometry objects in ArcPy?

I am developing a script in which I want to create a multipart line geometry. For example: I have one array of points a,b,c and second array of points e,d,f. I want to create one multipart line ...
8
votes
2answers
7k 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 ...
13
votes
3answers
40k views

Splitting multi-part polygon into single polygons using ArcGIS Desktop?

How do I split a multipart polygon which consists of several polygons into single polygons so I can delete each polygon without deleting them all at one time? I am using ArcGIS Desktop 10.0.
1
vote
0answers
1k views

Converting multipart line into single parts using QGIS?

I have a shapefile in which a bunch of the lines are multipart. Sometimes this is due to joining ways that are not quite connected (gap less than a foot of real-world distance) and sometimes the ...
6
votes
1answer
3k views

Loading a multipoint shapefile in R

This issue has only been raised in the community once, two years ago, to the best of my knowledge. I think it's high time to raise the issue again! readOGR, from the rgdal package, cannot handle ...
7
votes
1answer
2k views

Creating Multi-Part Polygons that touch internally using ArcGIS Desktop?

I have a set of parcels as illustrated in the image below. There are currently no multi-part features in dataset. What I would like to do is to merge (not the right word) all of the parcels with same ...
-4
votes
1answer
717 views

Creating multipart polygon using ArcObjects if coordinates of each part are given? [closed]

How to create a multipart polygon if i am having the values of coordinates of each part. I am using ArcObjects in VBA or VB.NET
27
votes
2answers
4k views

Benefits of Multipart Features?

Multipart points, lines, and polygons are implemented in nearly every GIS, but what benefits, if any, do they provide? In a relational database attributes shared by different features can be stored ...