Where features overlap

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99 views

Creating many-to-many table from intersection between two polygon layers in QGIS?

I have created a buffer around several points. I want to intersect this layer with a Census Tract layer. My end goal is to create a table that would list all the census tracts that intersect with the ...
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2answers
118 views

Intersection point of polygon and the line created by two points ArcPy

I have polygon layer. I selected the most distant vertex from centroid (picture: point A). (How to do that is in the answer here: Select the most distant vertex from polygon's centroid using ...
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2answers
79 views

Intersection between line and polygon

I have 2 layers in openlayers: first is parcel layer (polygons) and second is railway layer (lines). They are already drawn and all i need to do is when i click on some line, to get intersection of ...
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1answer
42 views

Using Intersect result

With the help of @Durga I have a working java code for the intersect: gp = new GeoProcessor(); gp.setOverwriteOutput(true); Intersect newintersect = new Intersect(); String in = "(" + ...
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1answer
70 views

Using Intersect tool Java

i am trying to pass polyline and polygon feature classes i am not sure how to pass the list of features to the Intersect object: i tried this method: ArrayList<Object> featuresList = new ...
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1answer
96 views

Unable to draw a polygon due to “The feature cannot be added…”

The feature cannot be added because it's geometry collapsed due to intersection avoidance. see also http://i.imgur.com/xiiI7NE.png What happended: Let's say I have 2 layers. To the first I ...
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2answers
118 views

Adding Nodes to Linestrings at Overlapping Points with Polygon Layer in Spatialite

I have two Spatialite tables. A table called 'lines' which contains a PK column called OGC_FID and a LINESTRING column called GEOM. A table called polys which contains a PK column called OGC_FID and ...
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2answers
55 views

How to intersect two geodatabases in ModelBuilder?

Trying to intersect features from two file geodatabases in model builder. However, the databases can not be connected to the intersect as input features. Second opting - put all features into one ...
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1answer
116 views

QGIS 2.6 simplify a road network to obtain the intersections

In QGIS 2.6.1 in Ubuntu, I want to measure the density of block in this city (FYI my final aim is to measure the TOD level). I have the road network from French national IGN dataset BDTopo. I have ...
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1answer
160 views

PostGIS multiple conditional statement on spatial join

I want to make a multiple conditioned spatial query in PostGIS 2.0/PostgreSQL 9.3., OS Windows 7. There are 2 tables, cadastre (Polygon) and roads (Linestring). Query: Select the sum (one number) of ...
1
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1answer
92 views

How to compute tabulate intersection in QGIS?

I have a base layer of census data in census tracts (polygons). I'm looking to intersect those tracts with a buffer layer but I only want to include those census tracts whose area is over 50% within ...
2
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1answer
165 views

Incomplete intersection area using gIntersection in R

I have two SpatialPolygonsDataFrame, one of them is the deforested area in the Amazon and the other is the city of Vila Rica, which is in the same region. I would like to calculate the total ...
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0answers
57 views

How to count unique lines intersecting with polygons?

Like u can see on the attached picture i did an intersection with a Raster (purple squares) and the red lines. What i need to know is the count of joins each line has for each square. What makes ...
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0answers
73 views

Determine lat/lon intersection on earth from point in space along 3d line

I have a known point in space with a lat,lon,alt. It has a camera with a line of sight and a angle of field of view. I can take the central point and calculate each corner vector of the field of view, ...
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1answer
177 views

How to intersect FeatureCollections in turf.js efficiently?

I've been playing around with turf.js and I'd like to use turf.intersect to intersect two datasets. My raw data are two polygon shape files so I converted them to geojson. I then tried to use ...
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39 views

Join polygons by plurality overlap

I'm trying to join two layers-- One is census tracts in Michigan; The other is school districts. Because there is no nesting in either direction (districts in multiple tracts and vice versa), I'm ...
2
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1answer
58 views

Isolate features within buffer of another feature - QGIS

I have 2 shapes - one representing line features of pipes, another of roads. I would like to create a separate shapefile consisting only of the pipes that lie within 20m of the roads. Only the ...
1
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1answer
128 views

Multi-part Geometrical Intersection error

I am working with intersection of polygon and line segments (continued from a previous question). When a Line intersects with a Polygon, the result is a LineString; When a LineRing intersects with ...
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0answers
46 views

How to cut parallelogram with intersecting line?

I have a very specific set of circumstances under which I need to break a parallelogram into 2 pieces. The parallelogram obviously always have 4 vertices and the intersecting line intersects the ...
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1answer
434 views

Line vs. Polygon Intersection Coordinates

I am working with Python, Shapely and Fiona... Is there any way where I can give in an input of a line shapefile and a polygon shapefile, and get a result of the intersection points and their ...
2
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1answer
49 views

Is this Intersect or Union algorithm associative?

Similar to Is the Intersection Operation Commutative? . Spoiler for that one: Intersection is commutative and associative. I've created an algorithm (in PostGIS but the theory would work in other ...
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1answer
127 views

PostGIS: Ensure Intersection of 2 Polygons results in a Polygon

I want to ensure that the result of ST_Intersection(polygon1, polygon2) is also a polygon. I initially filtering by ST_Overlaps(polygon1, polygon2) but that seems to only ensure that both features ...
0
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1answer
118 views

Oracle Spatial Returns Different Intersection Results with SRID Defined

I have a set of points and a set of polygons of which I am performing an intersection on to determine which polygon each point lies in. This was performed previously without the projection being ...
2
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1answer
40 views

Assigning values to a grid cell based on number of intersecting features

I need to create a grid that will include a single value for each cell which represents the total number of "stressors" intersecting that cell. So, the final product will be a 1km grid with cells ...
2
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0answers
316 views

arcpy.Intersect_analysis() returns empty result, but Intersect tool in ArcMap is succesful [closed]

I've got two large feature classes that I'm trying to perform an intersect on. Using the following python code, I get an empty output feature class: arcpy.Intersect_analysis(["Schools","Zips"], ...
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0answers
22 views

How to check if there is an intersect between two coordinates? [duplicate]

I have two pairs of lat/lon (expressed in decimal degrees) along with their radius (expressed in meters). How can I see if there is an intersect between these two points? How should I deal with the ...
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184 views

convert lat/lon into meters

I have a database of latitude, longitude and radius in the following form: 48180759,11518950,19.0 Both latitude and longitude are expressed in degrees but then multiplied by 1e6 (or 1000000). ...
2
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1answer
120 views

Finding an ogr2ogr equivalent of SelectLayerByLocation

So I'm trying to take individual grid point buffers and only select the regions that the points intersect with (via SelectByLocation). Generally I run the following code to: Explode multipart ...
2
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1answer
103 views

Why are a polygon's vertices jumbled after importing KML into MySQL?

This is original KML : <Polygon><outerBoundaryIs><LinearRing><coordinates>104.700355,-3.056064 104.632127,-3.103623 104.608924,-3.103169 104.570166,-3.102411 ...
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0answers
321 views

SQL Server : find Intersecting geometries with a geometry using sql query

I asked this question on parallel site (h++p://stackoverflow.com)and think this is a better place to ask such questions I want to find all geometries in a table that intersects with spacial geometry ...
5
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1answer
125 views

How to connect centroids of lines sharing the same intersection in QGIS?

I'm looking for a big help to accomplish the following task: I have this street network of the center of Turin (IT), composed by lines representing streets, and black points representing ...
0
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0answers
196 views

Alternative way to find intersection between two polygon feature classes

I have been working on making a script to find intersection between two polygon ArcGIS feature classes. I can successfully do this in arcpy instances using spatial join or using search cursors on the ...
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1answer
28 views

how do you erase polygons that don't have a line intersection?

I am trying to erase any polygons that do not have a line intersection through them and am unsure of what tool to use using ArcMap 10.1
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1answer
100 views

What is a OGRGeometryShadow and why can't I use it in Intersects()-method?

I'm trying to script something with Python and GDAL/OGR and Shapely. What I have: two LineString geometries: "geom1" and "geom2" I made an Intersection: "intersection = geom1.Intersection(geom2)" ...
1
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1answer
83 views

Computing intersections for each geometry in a table

I have a table with many Linestrings and for each of these Linestrings I need to figure out which other Linestrings, from the same table, intersect with it. If I recall correctly this gives me a ...
1
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1answer
356 views

Intersect/union two different polygon layers to produce a third polygon type

Can anyone instruct me on the correct way to union/intersect two different layers containing polygons so that a third layer is created containing the attributes of the non-overlapping regions from ...
2
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2answers
88 views

QGIS failing to complete clip or intersect

I have been trying to perform a intersect (then tried using clip) on a rather large dataset on QGIS. I have been able to complete similar geoprocessing using slightly smaller datasets and the layer. ...
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0answers
26 views

Run intersects function in PHP?

I have an old script that used to connect to a postGIS DB and basically perform: $sql="select * from mobile.regions_ne where intersects(geom_wgs84,GeomFromEWKT('SRID=4326;POINT (".$lng." ".$lat." ...
2
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2answers
1k views

Intersect Shapefiles using Shapely

What I'd like to try and do is intersect some point buffers with census tracts, maintain their ID's and the tracts attributes. I found a sample from ...
3
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1answer
147 views

How to create a cluster of crashes?

I have a shapefile with 52K points of road accidents, between 2007 and 2012. Each accident has a severity index. I want show clusters of 5 accidents (at least), for each year, that have a severity ...
3
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0answers
107 views

Most efficient way to intersect overlapping polylines

I have 4 multipart polyline shapefiles (download a sample dataset here). The geometries are identical, except for the length of segments in each shapefile. They represent 4 variables describing an ...
3
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0answers
114 views

Calculating length of road network within a polygon [duplicate]

I have a road network stored in a gdb and some polygons in another gdb. I want to populate an attribute for each polygon with the total length (in km) of the road network that it overlaps. Any idea ...
2
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0answers
36 views

How can I calculate the intersection of a line and the geoid (EGM96)? [closed]

I have a known line (point and vector) described in ECEF (Earth-Centered, Earth-Fixed) coordinates and I need to find where it intersects the geoid (Earth Gravitational Model 1996). Is there existing ...
2
votes
1answer
62 views

SQL Server equivelent to Arcmap Intersect for polygons?

I have three different sets of GEOMETRY Polygon datasets in SQL Server that completely overlap. I need to create a new dataset that has a polygon for each unique area of the three layers. So ...
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2answers
234 views

Create Intersecting lines and remove dangles

I have 3 cases shown in the image..In all of them i want to intersect the lines and remove dangles using python in Qgis python console so afterwards i can make a plugin for this work in qgis.In case 1 ...
6
votes
2answers
520 views

Split lines at intersection points

I've got some linestrings covering a road network, and need to split them at the crossroads. Does anybody have any idea on how to do it? I'm using QGIS 2.4, with a Postgis 2.1.3.
4
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0answers
84 views

Intersection of a vector linestring and underlying DEM

Following is an screen-shot where ASTER DEM raster layer has been overlaid by a road linestring vector layer. I want to extract those DEM pixels which are lying exactly beneath the linestrings. I want ...
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1answer
39 views

How to find points present in one layer but not in a second layer, using ArcGIS?

I have two layers, A and B, with B consisting of a proper subset of the points in A. How can I produce a third layer, C, consisting of just those points found in A but not in B. In R, I would just ...
1
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1answer
27 views

arcmap mapping information of 2 layers, how to get rid of non-related results

I have 2 layers on the map: 1 drain line layer and 1 segment layer. The segment layer is covered by the drain line layer. Now I want to get the corresponding attribute values on drainline layer which ...
1
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1answer
41 views

How to calculate the intersection between WFS layer and a PostGIS table

I need to calculate the intersections betweek a WFS layer and the geometries stored in PostGIS table. Then I should save the geometries of the intersections in a separate PostGIS table. Do you have ...