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0
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0answers
14 views

How to split apart overlapping features

I have a set of 20 features that are the exact same shape (a rectangle) that are stacked on top of one another in qGIS. Is there a way to programmatically separate them? Ideally I'd like to separate ...
2
votes
0answers
21 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 ...
0
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0answers
7 views

shifting/seperating overlapping polygons into several smaller polygons within the same sapce (QGIS)

I'm using QGIS and have shape files from the City for parcels of land. There are a few apartments and condos in which the parcels have not been separated - i.e., instead of a dozen small rectangles ...
1
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0answers
28 views

Why does clip only return the top polygon?

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 ...
1
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0answers
18 views

Calculating Percent Overlap Between Distribution Maps

Hello there, I am currently trying to calculate the percent overlap (basically the total amount of overlap where these two species come into contact) between Lithobates catesbeiana (first image) ...
3
votes
1answer
55 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 ...
2
votes
1answer
41 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
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0answers
39 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 ...
0
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0answers
25 views

Intersecting Overlapping Polygons Individually in ArcGIS

Map Layers: -Census Tract Shape File w/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 ...
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0answers
7 views

Alternative to RemoveOverlap in Business Analyst

Is there an alternative process or function that will remove overlap similar to RemoveOverlap in Business Analyst? I do not have a business analyst license. Thank you
0
votes
1answer
143 views

Smooth polygon boundaries

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 ...
0
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0answers
35 views

Is it possible to compare two shape file if they have overlapped and gap between two data or not in QGIS

I am QGIS 2.0 user. I would like to compare two different shape file in the same region. This two shape file's outside border must be the same position. It means the overlap and gap must be zero. In ...
1
vote
1answer
50 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 ...
2
votes
1answer
51 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 ...
2
votes
1answer
96 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 ...
0
votes
0answers
21 views

What is QGIS equivalent to ArcGIS Identity tool? [duplicate]

I'm looking for a tool that can be used to join the attributes of two overlapping datasets. In ArcMap this is the Identity tool. What is the tool called in QGIS?
1
vote
0answers
100 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, ...
2
votes
1answer
143 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
1answer
198 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 & ...
1
vote
1answer
137 views

How to check for overlapping polygons in Oracle?

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
145 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 ...
1
vote
1answer
51 views

merge rasters with nodata cells

I want to create 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 ...
2
votes
2answers
58 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
162 views

erasing overlapping polygons from same layer

Hi there 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 model builder to ...
2
votes
0answers
34 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
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0answers
208 views

Google map showing Overlapping Boundaries [closed]

I am working in process of building an online Geocoding and Reverse Geocoding Service .For That I have been preparing a database by creating a centroid point in a shapefile and sending the point to ...
0
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0answers
47 views

Dissolving overlapping polygons - issue in QGIS [duplicate]

I have the OS Code-Point map which I want to dissolve into the regions that my company use. I have used the dissolve function in QGIS, but it is having a problem where a vertical street overlaps with ...
1
vote
0answers
71 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 ...
2
votes
2answers
624 views

How to delete overlapping polygon features from one of two layers?

I really need your help! 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 ...
0
votes
0answers
32 views

Finding overlapped areas and identifying their frequencies in a polygon layer

I have a fire patch polygon layer from 1998 to 2012 and I want to find the areas which experienced the fire several times! How I can find those overlapped areas and the times they experienced it ...
1
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0answers
82 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
247 views

When trying to convert lon/lat (curved) coordinates to projected (flat) coordinates with ruby, the second (y axis) projected coords are inaccurate

So I have created a polygon using Google Earth pro. I've exported it into a kml file, which I can then parse using ruby's XML/HTTP-parsing Nokogiri gem into an array of WKT points (LinearRing) thats ...
5
votes
1answer
271 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
5answers
348 views

How can I count overlapping polygons, resulting in a 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
93 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 ...
1
vote
1answer
47 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 ...
5
votes
1answer
541 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
214 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 db entries where the polygons of a multipolygon overlap - within the same geometry? So, a function that checks ...
4
votes
1answer
74 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 ...
2
votes
1answer
144 views

Overlapping Polygons in same feature class using Arcobjects

I have a polygon feature classs with millions of records, I need to find list of overlapping or intersecting polygons in the same feature class, and how to do it efficiently? I need a ESRI ...
1
vote
2answers
662 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 ...
3
votes
2answers
318 views

How to efficiently check for feature overlaps with Arcpy?

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 ...
5
votes
3answers
264 views

How to combine stacked polygons within a shapefile?

The image below shows my shp-file. Every polygon has the same transparent color. So a darker blue means, that several polygons are stacked! How do I cut every polygon with each other so no polygons ...
6
votes
3answers
288 views

How to Display Overlapping Lines?

I have multiple line layers that represent bus routes and many of the routes overlap (i.e. near terminals, transfer locations, etc.) Is there a function in Qgis which will display both features ...
1
vote
0answers
96 views

Overlapping polygon outlines dashed at overlapping locations but solid elsewhere

In ArcMap 10.0, if one smaller polygon fits inside of another and shares a portion of the larger polygon's boundary, and they both are set to display thick outlines on the inside, is there a way to ...
6
votes
0answers
90 views

What are common ways of presenting features that share coordinates?

When I encounter features of the same class, but with identical coordinates I lay them out in a spiral arm formation. I chose to pick the initial radius and angle at random (can't recall my actual ...
8
votes
2answers
2k views

How to display transparent overlapping polygons in ArcGIS?

I'm trying to draw home range maps in ArcGIS 10.1 and am having difficulty displaying them as I would like. The home ranges are in the form of polygons and many of them overlap. I'm trying to get a ...
9
votes
0answers
104 views

Iterating a model to create 3 buffers around three points and find their intersection (trilateration) in arcgis 10 [duplicate]

This past summer I recorded the location of a large number of plants I was working with by calculating the distance from each plant to each of 3 tripods for which I have GPS coordinates. I'm trying to ...
7
votes
2answers
2k views

How to create a heat map or density map from stacked polygons in ArcMap 10

I have a polygon shape file that has many overlapping features. Each feature represents an area used by polar bears. So some of the polygons overlap and some don't, and there are separate clusters of ...
17
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1answer
3k views

Trilateration algorithm for n amount of points

I need to find algorithm that can calculate centroid A (aka gravity center, geometric center, center of mass) from the figure where circles T1,T2,T3,T4,T5,..,Tn intersect AND length of line R from ...