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Questions tagged [overlapping-features]

Features that share some or all of their spatial location with other features.

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15
votes
1answer
595 views

How to extract sublinestring from a linestring with overlapping segments

Problem statement: Given a bus route (defined as a linestring ln.the_geom), and a set of bus stop locations (pt1.the_geom,pt2.the_geom,...ptn.the_geom), divide the bus route into segments between bus ...
2
votes
1answer
153 views

Make convex hulls opaque or transparent

I have a series of convex hulls that I want to overlay but I want to be able to see all of them at the same time. How do I do this so? I'm guessing making them slightly transparent will do the trick
0
votes
1answer
581 views

How to perform an attribute-weighted sum of multiple polyline features from a single vector layer?

I have a shapefile of ~8000 polyline vector features representing traffic journeys on road routes. Each has an attribute representing volume of traffic for that journey. The routes are all generated ...
1
vote
1answer
2k views

Overlapping transparent polygons won't darken

A client of ours wanted a map showing the 5-mile and 10-mile radius around business locations today and specifically requested that the overlapping transparent buffer radii grow darker with each other ...
1
vote
1answer
91 views

Union with Concatenated Values

I have a polygon feature class in which the polygons frequently overlap each other. I want to find all of the unique combinations of overlapping polygons within that feature class. I believe I want to ...
4
votes
1answer
387 views

Counting traversed arcs on routes to write attributes using ArcGIS for Desktop?

I have number of persons located on a road network and I have calculated their shortest distance to a particular location. From the routes output created from Closest Facility can I break the routes ...
1
vote
4answers
7k views

How to merge overlapped shapefiles without one layer's overlapping area?

I created a forest type map from 50 scene satellite images as shapefile under the following conditions. Some shapefiles are overlapped, because scene overlaps each other. There is an order of ...
11
votes
1answer
2k views

Is there a “Disperse Markers” tool for QGIS?

I am using ArcGIS, but either I would like to use QGIS and maybe want to switch completely later. A have a point overlapping problem, as a result of geocoding of addresses. I have not found any ...
1
vote
2answers
326 views

Create Shapefile of all overlapping features from single Shapefile

I need to create a Shapefile out of another Spahefile that consists all overlaps of features within the initial Shapefile. I'm sure there is a simple solution using ArcMap or QGIS, but at the moment ...
1
vote
1answer
139 views

Detecting overlap for buffered lines using ArcGIS Desktop? [closed]

We have almost 50000+ lines which we want to remove a line if it is too close to the other. So we tried to do a buffer for two line, then check if the buffer area are overlapped. I wonder if there ...
0
votes
1answer
587 views

Keeping only maximal value of two overlapping polygon (along with initial value where they do not) using ModelBuilder?

I work with ArcGis 10.2. I want to Combine (Union?) two Polygons FC of waterdepths, both having the same classification but not the same elements. I want to keep all the elements and all the initial ...
1
vote
2answers
556 views

Selecting isolated polygons which are not donuts but may overlap using ArcGIS Desktop?

I'm exploring a few different options for this process and I'm unsure what would be most effective. I'm trying to find all isolated, non-intercepting polygons in the same layer (not to merge). Most ...
0
votes
2answers
54 views

Getting data of area covered by polygon in ArcGIS Desktop?

We have a layer that contains land parcel information such as area for each parcel, and a unique parcel ID. We also have multiple polygons that cover some parcels. We're trying to figure out how to ...
5
votes
2answers
610 views

Postal codes in shapefile overlapping

I downloaded some shapefiles from the Australian Bureau of Statistics (ABS). Its basically showing a bunch of suburbs when I view the shapefile through a GIS tool. The GIS tool that I am using at ...
1
vote
0answers
58 views

Clip only returning top polygon in ArcPy? [closed]

I'm running the command below on a data set with many stacked polygons. This is a county standard so I can't change the way they manage their data. Each type of polygon can be uniquely identified ...
5
votes
1answer
1k views

PostGIS - when I add a polygon, delete overlapping areas in other layers

I'm starting to work with PostGIS and I'd like to solve the following problem: In my database, I have multiple land use class layers, for example: "residential", "industrial", "commercial". The ...
6
votes
2answers
7k views

How to select only polygons that overlap with another layer?

I have two shapefile layers created from different thresholds from a predictive model (Pink=80; Yellow=95). Is there a way to create a new layer of only those pink polygons that contain yellow ...
1
vote
0answers
680 views

How to simplify a self intersected / self overlapped polyline using ArcObjects?

I have a self intersected polyline, how can I break it into 5 records stored in the same table using arcobjects? (splited by vertices and the intersection point) Here is what I have got and it doesn'...
1
vote
1answer
787 views

Intersecting overlapping polygons individually in ArcGIS Desktop

Map Layers: Census Tract ShapeFile with Population Data Set of Store Locations with 5 Mile Buffers (Significant Overlap Between Buffers) I have create feature layers for both and I am trying to ...
4
votes
1answer
1k views

Counting and rasterizing polygon overlaps in QGIS?

I have a large number of polygons that are overlapping. I'd like to create a heat map and plan on using raster calculation to do this. My plan: to give each polygon a raster value of 1, and adding ...
1
vote
1answer
1k views

Smoothing polygon boundaries? [closed]

I have a kml file with boundary polygon. It has a lot of gaps and overlaps in them. I converted them into shapefile and tried to use smooth and generalization feature tool in a couple of GIS software'...
1
vote
1answer
571 views

Find areas of overlap [duplicate]

Apologies if this question has been asked (I suspect it has or is so simple that people havent needed to ask it) but I am extremely inexperienced with GIS software and need it to find out some ...
4
votes
1answer
998 views

how to make public transportation map?

I have collected the public transport routes and i want to map a map that looks like this. My problem is i am not able to show the shared segments as parallel lines. I have not been able to find good ...
3
votes
1answer
1k views

How to define polygons overlapping each other?

I have a shapefile of landuse in different catchments. I want to calculate the percentage of each landuse category in each catchment using Tabulate Intersection. Before using this tool, I had ...
25
votes
4answers
4k views

Making map where overlapping symbols increase Opacity?

I was looking at some maps like: Map from Ship Logs or the Facebook worldwide friendships Mapped (via the Flowing Data blog) These Maps look good because single lines are almost transparent, and as ...
2
votes
0answers
599 views

Drawing a road network: offsetting overlapping lines (directed graph)

Say I have a road network defined by a table, indicating, for each arc, its ID, and its head and tail node. In other words, my network is defined as a directed graph. For example, we have two points, ...
1
vote
0answers
132 views

Checking for overlaps in polygons using Oracle Spatial?

I want to get a list of all the polygons from table 2 which overlap with one polygon from table 1. Following is the query which I am trying to use which doesnt give any result. Select b.bg_id from ...
3
votes
1answer
975 views

Creating buffers that will not overlap in QGIS

I am dealing with a .shp with a number of points in it. The distances between points range from ~300m to 5km. I wish to create a 1 km buffer around each point with as little overlap as possible. Each ...
2
votes
2answers
9k views

Cleaning up overlapping polylines

I am working on creating a project boundary for a specific area. To do this I merged several data sets including roads,rivers & railroads (polylines) and lakes, civil townships & ...
2
votes
1answer
2k views

Checking for overlapping polygons in Oracle Spatial?

I have a table 1 which has a fields like store number and geometry and it just has one record in it. Now I want to check for this store number in table 2 and identify if there are any polygons ...
1
vote
1answer
468 views

Automatically determine polygon overlap 'islands'

I have a shapefile with many polygons. Some partly overlap with each other, some are not overlapping. I'm considering a polygon to be overlapping given a minimum area of overlap. 'Islands' of partly ...
2
votes
2answers
1k views

How to merge rasters with nodata cells in Arcgis

I want to create a single attribute table base on multiple overlapping raster. Some raster do not overlap completely but have common areas. In that situation I need the value from other raster while ...
3
votes
2answers
319 views

Clipping multipart polygons iteratively

I have a shapefile of buffers (n=10) and a shapefile of watersheds (n=10). Both shapefile contain overlapping features. I would like to clip each watershed feature with it's corresponding buffer, ...
3
votes
3answers
4k views

Erasing overlapping polygons from same layer using ModelBuilder?

I currently have a shapefile with 5 catagories of overlapping polygons ranked 0-4, 1 is the most recent polygon, four is the oldest and 0 is undefined. I am looking to use ModelBuilderr to seperate ...
2
votes
0answers
67 views

Layers with the same Geographic Coordinate system don't overlap [duplicate]

I am a GIS newbie. I'm having a problem that, from the looks of things on this website, is a fairly common problem. I have 3 layers, all in the same GCS that do not line up. I have read all the the ...
1
vote
0answers
428 views

Combine KML overlays to find overlapping shapes and export to flat file

I have two KML files with many polygons each. One has larger area polygons while the other has smaller areas. They overlap with each other and I would like to know which areas overlap with each other ...
10
votes
3answers
15k views

Deleting overlapping polygon features from one of two layers using QGIS?

I have two overlapping layers of polygons, and I need to somehow erase the areas the overlaps. -This way i should end up with two layers of non overlapping polygons. Sounds pretty simple but I just ...
1
vote
0answers
357 views

Calculate values to represent bus route attribute

I'm working with bus routes and looking for a way to represent some values in this system. I want each street to be represented by thickness based on value returned in SUM or COUNT. I don't have big ...
3
votes
1answer
255 views

How to drill down through multiple polygons/points in QGIS?

I have a layer that has multiple polygons sitting on top of each other, is there a way to easily scroll through those polygons that overlap each other?
6
votes
1answer
2k views

ArcGIS Symbology Transparency

Using ArcGIS 10.1, I am interested in symbolizing a series of polylines to generate a pseudo-heatmap like one of the answers to this question. The essence of the solution idea is to symbolize each ...
3
votes
6answers
2k views

Counting overlapping polygons in GeoJSON to result in new set of polygons?

I have 100 polygons in a GeoJSON file that partially overlap each other. I would like to produce 100 new polygons as follows: The area covered by any of the original 100. This is their union. The ...
1
vote
2answers
417 views

Frequency of partially or fully overlapping lines

Let L be a set of line-segments (lines) in a two-dimensional (2D) Euclidean space that are randomly (say, using uniform random function) distributed, that is, some may overlap other(s). Overlapping ...
4
votes
1answer
631 views

Move shared vertices together

I should move some vertices of a polygon to fix the boundaries of a country, how can I do it while keeping the adjacent polygons still connected? Is there a way to anchor permanently overlapped ...
6
votes
1answer
3k views

Identify polygon overlaps within single shapefile

Using either QGIS (1.9) or ArcInfo (9.3.1) I'm trying to identify unique overlaps of prehistoric building footprints from an archaeological site recorded within a single polygon shapefile. While the ...
0
votes
2answers
1k views

How to find overlapping polygons within a multipolygon (Oracle spatial)

I am working with Oracle spatial and have a table with MULTIPOLYGONS. How can I find the database entries where the polygons of a multipolygon overlap - within the same geometry? So, a function that ...
0
votes
1answer
269 views

Determing partially Overlapped features from two linear feature classes

I have been trying to find object ids of features that overlap partially. Input taken is two linear feature classes , I have tried IRelationalOperator Overlaps methords , but it seems that it only ...
7
votes
2answers
671 views

How to select behind feature which is overlapped with the same layer on QGIS 1.8.0

My issue: I received data which was created without "Avoid intersection of new polygon". There a few overlapped feature with the same layer. I could fine overlapped feature by the spatial query. But ...
1
vote
1answer
83 views

Finding overlap of three polygons using ArcGIS for Desktop?

I have three polygon areas showing different land types and I want to create a new layer based on where the three layers overlap each other. I thought this was a subtraction query but havent been ...
2
votes
2answers
9k views

Find and list all polygons that overlap with another polygon

I am working with two polygon layers which overlap but are unrelated (one is congressional district boundaries, the other is MPO area boundaries). I would like to generate a list of all the ...
4
votes
2answers
2k views

Efficiently checking for feature overlaps with ArcPy? [closed]

In an effort to reduce processing time, I am looking for ways to pre-process data within my script. I have ~18,000 featureclasses with ~500 features each (all simple circle polygons) from which I want ...