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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13 views

Multipart multipatch to singlepart multipatches

I have a multipatch (building 53) which is comprised of buildings which are logically singlepart polygons. I am using ArcGIS Pro, the multipatches are generated from Terrasolid, which means that the ...
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20 views

Part of feature belongs to wrong feature [duplicate]

Is there a quick way (without having to create new layers) to make the island circled in the bottom left a part of central america (dark blue) rather than a -part of Central France (yellow)?
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41 views

Detaching part of feature without detaching all parts from each other?

On this map, Denmark and Greenland are one feature, and I need them to be two features. How do I split them apart? If I use Singlepart to Multipart, I create a new layer where there is a feature for ...
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23 views

Labeling polygon with several parts with lines converging on one label using ArcMap

I'm trying to label in ArcMap 10.6 a polygon with three parts. With the labeling manager, and I've arrived to label the three parts with three labels (image 1). It doesn't look horrible but it takes ...
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1answer
96 views

Output data of NDVI of multiple regions into table from GEE

I am using GEE for NDVI calculating. There are 150 more counties in USA. I am now stuck in outputting the NDVI ("interest" at code) of each counties listing with "OBJECTID" at the ...
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1answer
16 views

Segmenting a feature class based on the geometry of a multipart feature class

I have a single feature class representing tree canopy over the span of several cities. I want to segment it so that I can calculate the percentage of canopy per census tract. I'm using ArcMap 10.7.1 ...
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3answers
72 views

Splitting map, island tied in same polygon as mainland using QGIS

I have a map originally as a shapefile. The map includes a country (mainland) and an island far away from the mainland. I want to cut the map so that only the mainland is shown and save it again as a ...
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72 views

Forming Multipart Geometries (MultiPolygons) in PyQGIS

I am creating my own map tool which is supposed to be able to draw multipart polygons and upload them to the database. ( I know QGIS 3.4 has multipart geometry tool bar built in but because I want to ...
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1answer
23 views

Applying a Single Gradient Fill Color to a multipart feature

So I have an indicatrix covering a world map for the purpose of illustrating distortions for different projections. I want the circles of the indicatrix to share the same gradient fill color, as ...
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18 views

How Should I convert a multi parts feature in a polygon layer to the multi features? [duplicate]

I have a multi part polygon in QGIS consist of three parts. I would like to split this to three separated features with the same attribute. How should I do this?
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1answer
51 views

Geocortex and ArcMap

I am currently working with a shapefile made up of multi-part polygons symbolizing zoning areas. Geocortex is a web-based service used to display your data. When I click on a larger polygon in ArcMap ...
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1answer
70 views

Collecting Geometries using ArcMap

Objective: Convert different single part features with same attribute in a field (say 'Country') to a single multipart feature while retaining original geometries. I have been looking for an ArcMap ...
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21 views

Creating unique points at the start of multipart polylines in ArcGIS Pro

I have polylines from a network analysis representing public transport trips. These are multipart polylines. I need to identify the starting point for each trip. However, using vertices to points to ...
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42 views

Splitting multipatch based on whether features are connected

I am using ArcGIS Pro 2.4.2. I have an OBJ file of several hundred buildings that, when imported using the Import 3D Files tool, is converted to a multipatch file with a single multipart feature for ...
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174 views

Create new MultiPolygon with PyQGIS

I want to create a new MultiPolygon shapefile, I tried this code Mp_Layer = QgsVectorLayer('MultiPolygon?crs=EPSG:26191', 'layer', 'memory') QgsProject.instance.addMapLayer(Mp_Layer) But when I ...
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31 views

Copy features from a SQLite multipolygon to SQLite polygon layer

I need to copy features from a multipolygon layer that contains multipart features into a polygon layer in SQLite in QGIS. I know I can run the "Multiparts to Singleparts" algorithm and simply copy ...
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22 views

Creating multipoints from points and setting incrementing M value in spatialite

I have a layer of points, which I want to group into multipoints grouping by some column. This part is easy: SELECT name_pre, CastToMulti(GUnion(geometry)) AS geometry FROM sp_survey GROUP BY ...
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1answer
91 views

Removing space between multipart polygon in QGIS 3?

I am looking for an efficient method to edit and remove the space between multipart polygons in QGIS 3. I have an example below which should hopefully be clear: Multipart polygon Final result I ...
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1answer
176 views

Measure collected polygons in Geometry Generator, avoiding extra texts from multipart polygons

I combined a set of polygons on the first instance of Geometry generator using something like this: buffer(buffer(collect( $geometry, concat("MZNA","REGLABEL")), 0.1), -0.1) Buffers are meant to ...
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1answer
533 views

What is difference between LineString and MultiLineString? [closed]

What is the difference between Linestring and multiline string, and things like compound curve, curve polygon, multicurve, and multisurface?
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0answers
31 views

How to delete a file after processing an algorithm in QGIS 2.18?

I am trying to delete an intermediate file ("Temp_merged.shp") after running the singleparts to multiparts algorithm in QGIS 2.18. import glob, os, processing path_to_shp = "C:/Temp/Tracks/" ...
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1answer
482 views

Using Dissolve and Multipart to Singlepart in QGIS?

I started with a network of polylines. In QGIS I used dissolve to 'merge' all lines according to an attribute value. This did exactly that, but included non-connecting lines which I don't want. I ...
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2answers
794 views

Is there a “Merge Parts” tool in QGIS?

In the advanced digitizing toolbar, QGIS has these 3 tools: Split Features, Split Parts, and Merge Features. Is there a tool or equivalent algorithm for the logical fourth one: "Merge Parts"? This ...
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1answer
1k views

Turning a single MultiPolygon into many small polygons?

I have a large GeoJSON file with a single very complex MultiPolygon, and I would like to turn it into an identical file with many small polygons. How can I do this? I can use ogr2ogr or mapshaper or ...
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1answer
77 views

Update geometries with ST_UnaryUnion at TRIGGER

We are currently working on database with multipolygons and we're using QGIS 3. Sometimes it's very useful to work with parts (each page of document is separate part of multipolygon), however at the ...
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2answers
3k views

Splitting multipart polygons to single part in R?

I am looking for the equivalent of "Convert multipart features to multiple singlepart features. Creates simple polygons and lines" in QGIS and similar in ArcGIS for R. Various analyses create ...
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104 views

Promoting to multipart using PyQGIS?

I am creating a code that aggregates neighbouring polygons if they have similar value on the field 'DN' and if they are closer than 50 m.Then I want to iterate this 3 times. I could already get the ...
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2answers
491 views

Bug of QGIS when using “multipart to singlepart”?

I used yesterday, in QGIS 3.2.3 the tool to convert multiline to a single line ("multipart to single part"). I chose the option of the command "multipart to single part" the geometry feature (line) ...
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1answer
154 views

Get pixel values from a raster using a multipartpolygon

I'm trying to get the mean value of pixels from an NDVI raster, that intersect the geometry of a FeatureCollection, that is a multipart polygon which represents my sample area, but I can't find the ...
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0answers
37 views

Error creating new polygons. QGIS

When I work in QGIS and try to fill gaps between polygons creating another one over them (project snapping settings are selected as Avoid intersection), I hope "fill" this gap with just one polygon ...
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2answers
191 views

Connect multipart polygon with lines to one label

I have several one-part and multipart polygons that I want to label. I Set X and Y values to move the label to a certain position and want to connect the label to the polygon using the following ...
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1answer
2k views

Buffer with dissolve - Geopandas - unary_union multipolygon

I am trying to buffer points which are quite close together, and then dissolve the overlapping buffer polygons into larger polygons. After doing the buffer is where I have the issue. I have tried ...
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1answer
121 views

Why are multipart features not allowed in Geometric Networks?

I'm beginning to familiarize myself with Geometric Networks in ArcGIS Desktop, and according to About Verify Network tools and commands, multi-part features are not allowed, but they do not explain ...
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0answers
287 views

How to find a polygon error in QGIS?

I loaded the following multipart polygon in QGIS which consists of three separate polygons. The highlighted (yellow) polygon consists of the bigger upper part and the smaller lower part. My aim is to ...
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1answer
408 views

Export multipolygons into a GeoPackage

In FME, I use the Aggregator to merge polygons based on one attribute (desnat in my example file). When the output is Shapefile, multipolygons are created and all works fine. When the output is OGC ...
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2answers
6k views

What is a multipoint shapefile?

What is the difference between a multipoint shapefile and a point shapefile. in the creation of a shapefile In ArcGIS it has the choice of point shapefile and multipoint shapefile. But I do not know ...
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2answers
185 views

Buffering with dissolve type: ALL for a big feature class doesnot create a single multipart feature

I am using buffer tool on large complicated network (260,000 features) line shapefile to create an area shapefile. This area shapefile somehow has to be dissolved to a single multipart shapefile. ...
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2answers
1k views

delete segments from road layer - QGIS

I have a road layer, with two locations points. I have created a shortest path analysis between these points. Now, I would like to delete some segment from the road network. I would like to delete (...
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0answers
167 views

QGIS lines multipart to singlepart without splitting at self-intersection

I have a line layer and a vector grid. Now I want to count the lines in each raster. First I split the lines by intersecting the line layer with the vector grid. Second, I need to do a multipart to ...
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1answer
291 views

Float not iterable

import arcpy arcpy.env.workspace = "c:/esripress/python/data" fc = "Hawaii.shp"     cursor = arcpy.da.SearchCursor(fc, ["OID@","SHAPE@"])   for shape in cursor:        print "Total area: {}"....
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2answers
486 views

Does exist a Python library to generate polygons avoiding antimeridian issues?

If I need to generate a polygon that crosses the anti-meridian, does it exists a Python library that treat such cases (partitioning such polygon and generate a multipart polygon)?
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1answer
3k views

Dividing multipart polygon into many polygons using QGIS

I have a polygon which is actually composed of many polygons but it results as unique geometry in the shapefile. It's easier to explain with a picture. The yellow parts are in my shapefile a single ...
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1answer
318 views

Creating point feature from dictionary in ArcPy? [closed]

I'm trying to create a multipoint feature in arcpy, with information in fields attached to the points. I get how to make a multipoint feature I think, but these are just points. How to add fields to ...
4
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1answer
588 views

Dissolving reprojected features split into two parts by international dateline (180 degrees) in QGIS

I am trying to view the World EEZ polygon from Marine Regions.org, but centered on the Pacific Ocean. To centre the EEZ map on the Pacific ocean I followed these steps. The custom CRS from this ...
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0answers
51 views

Reoccurring multipart / slivers / topology errors using file geodatabase?

Recently I had to hand in a FGDB to state authorities. I did all topology checks and corrections as defined in their specifications (see list below). My collegue did a cross check on a the same FGDB. ...
2
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1answer
450 views

How to select multi-part polygons from a layer using PyQGIS

My script is - # Find all multipart features in the active layer l = iface.activeLayer() iter = l.getFeatures() geoms = [] for feature in iter:     geom = feature.geometry()     if geom.isMultipart()...
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3answers
3k views

Create dissolved buffer from multi-geometry (Union by shared attribute and spatial intersection)

I've to create dissolved buffers from multi-point input features. In the example below, the input table contains 4 features. Feature #2 consists of two point geometries. After creating a buffer, I get ...
2
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1answer
158 views

Converting a Multipart Polygon to a Single Line

I am dealing with a multipart polygon shapefile of Canada, where each province is its own polygon. Simply for cartographic purposes I want to display the provincial boundaries as a dashed line but ...
3
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1answer
345 views

Dissolve adjacent parts of multipolygon into a single Polygon

I have a multipolygon with two parts: I want to erase the line that separate both parts and get a single polygon that looks like this: I don't mind if I do it in QGIS or in Postgis, but it has to be ...
4
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1answer
2k views

Cut part of a shapefile

This is my first time with QGIS and maybe it is an easy question but I can't figure out how to cut part of a layer to add it to another one. In the image you can find (red circles) parts of a layer ...