Questions tagged [intersect]

Use for questions about the ArcGIS Intersect tool

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How to check if one polygon intersects with a feature class

I dynamically create a polygon from an array like this: import decimal lines = ['1|421474.904|4467629.2341','2|421590.35|4467592.7209','3|421611.5036|4467661.6442','4|421611.4173|4467661.7276','5|...
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3answers
964 views

Using Intersect Tool in ArcGIS gives empty output? [closed]

I'm currently searching for correlations between pavement conditions and crashes on highways. I created a 420ft buffer layer for my selected highways and now I am intersecting it with a layer for ...
2
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2answers
583 views

Easiest fix for polygon corner error in QGIS?

I am new to QGIS. What would be the easiest way to fix this apparent boundary error in a shapefile that I have downloaded? I believe it was intended for these lines to intersect as a 4-way corner, ...
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1answer
467 views

Intersecting raster layer with grid to find average within each cell in QGIS

I have a raster of population density and would like to intersect it with a polygon layer and have each polygon carry the average for the underlying raster cells. How would I go about this? I feel ...
1
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2answers
471 views

Clip/Intersect in QGIS 2.8.2 resulting in empty attribute table

I'm trying to clip two layers together (a layer showing the area of a city and a layer showing a political boundary running through that city) in order to show the location of the political boundary ...
2
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1answer
228 views

ogr2ogr sql - returning points from one sqlite dataset that intersect with another

I am having great difficulty with the simple st_intersect command when applied to two datasets containing points, derived from the same source. I am using osgeo4w gdal 2.1.3 at command line. My aim ...
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0answers
152 views

Need to find pair-wise intersection for multiple polygon layers?

I have 20 different polygons and I'd like all the pairwise intersection among them. I might be wrong, but I think Intersect isn't working because it's trying to find the intersection of all polygon ...
3
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1answer
1k views

Speeding up intersect query in PostGIS?

I would like to count the number of points that intersect with a list of polygons. The polygons are very complex (county/state boundaries). I'm using this query: SELECT gid, county_name, (...
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1answer
80 views

Intersect Tool - Same Polygon Feature Class Only Want Inner Overlap

I'm trying to find the best way to only get the inner overlap of multiple polygons within the same feature class. I've tried the Union/Dissolve method as well as the Intersect tool and can't get the ...
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0answers
45 views

Sudden errors intersecting NDVI raster data with overlapping polygons in GME

I am experiencing errors with Geospatial Modeling Environment (GME) that suddenly developed after things were working perfectly. Description of software installed: ArcGIS 10.3.1 for Desktop and ...
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0answers
109 views

How to project coordinates in spatialite using PHP?

I'm using a spatialite database in a PHP program and I need to simulate an "identify" on a polygon layer (EPSG 32632), using point whose coordinates are dinamically generated. I know that this query ...
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1answer
364 views

Implementing Pairwise Intersect Tool in ArcMap?

This is the first time I have tried to add a tool to the ArcMap 10.4.1 Toolbox. I downloaded the Pairwise Intersect Tool from here and installed it in My Toolboxes in the ArcCatalog : http://www....
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1answer
972 views

Intersect automatically updating Shape_Area and Shape_Length in ArcGIS Desktop?

I am making a model in ModelBuilder in ArcGIS Desktop 10.1. I am using Intersect tool. I need to calculate the Shape_Area and Shape_Length of my polygons (Projected Coordinate System, EPSG: 5514, S-...
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1answer
46 views

Using Intersect and Join to analyze data in ArcGIS Desktop?

I am attempting to calculate area covered by roads within a grid. I have used the intersect(analysis) tool to create a new shp file that segmented the road features according to the grid. I then ...
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0answers
83 views

postgres / postgis detecting new roads algorithm [closed]

I have a postgres (psql 9.1.22) database containing all the lines that ever existed in a region in OSM. I would like to detect newly mapped roads by year. This has to be done by a spatial query (...
2
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1answer
434 views

Assigning Values from Raster Layer to Vector Layer in ArcGIS Desktop?

I'm using ArcGIS Desktop 10.3. I have two layers. The first is a raster layer representing density of birds over a given area. The second layer is a polygon layer representing property boundaries, of ...
3
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1answer
443 views

Pyshp draws polygons out of order after intersection of two shapefiles

I have two shapefiles. One contains electoral borders but not coastline and the other contains provinces and coastlines. I am plotting the electoral districts using Python's pyshp and filling in the ...
2
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1answer
285 views

Cutting line features using polygons in one step?

I would like to cut a line layer using a polygon in one single step in QGIS. There is a solution to do that in more steps: First, using Intersect function, line portions that fall within the polygons ...
7
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1answer
4k views

Generate rectangular fishnet or vector (grid cells) shapefile in R?

I would like to create a polygon of 20 x 10 degree graticules from 180, -180 to 90, -90 degrees. To do this in QGIS, I followed: Vector creation tools > Create grid [Grid extent: -180, 180, -90, 90]...
3
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1answer
181 views

Count the number of buffers intersecting with zip code polygons

I have a short R script in which I read two sets of data: a shapefile showing the zip codes of a European country an Excel showing multiple points coordinates throughout the country I used the ...
1
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0answers
147 views

Batch Intersect Not Working

I'm trying to run a batch job for the Intersect(Analysis) tool in ArcMap 10.3, but when I do for 20 intersects, it brings back this error: ERROR 000210: Cannot create output. However, when I do an ...
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1answer
251 views

Counting overlaps on large line dataset using FME runs into memory issues?

I have a large dataset of lines (ca 400 000). Each line represents a calculated route on the same road network. My goal is to summarise a total number of calculated trips that pass each part of the ...
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1answer
172 views

Regrouping concat labels with overlapping intersecting geometries in QGIS

All the fields i want to show on the map are in the same layer. All the labels have to be showed on the map. But the concentration is high. So i would like to concat the labels when geometries are ...
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1answer
413 views

OGR GeometryReference Intersects() method with OSGB projection causing crash

I'm trying to use the GeometryReference.Intersects() method to see if a feature within a grid intersects with another polygon. I have tried it in the QGIS python console (windows) and directly on ...
2
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1answer
186 views

Combining several layers in ArcGIS Desktop using Intersect gives WARNING 000117: Warning empty output generated?

I'm using ArcGIS 10.3 I have the following 4 layers (all are polygons) You can find these layers in this link DATA Sites: 5 subcatchments (Site1 to site5) and site 5 combine all subcatchments ...
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1answer
5k views

“Reverse” Intersection in ArcMap? [duplicate]

I have a polyline feature class and a polygon feature class. I would like to clip the extent of the polyline which are NOT overlaid on the polygon. How can I do that? I should be looking for ...
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0answers
25 views

Clipping out polygon into buffer layer so that buffer layer shows dominant feature from polygon layer? [duplicate]

What I am trying to do is clip out a land use layer for the city of Boulder, CO within the confines of a 500ft buffer that I have created for a bunch of road segments. Beyond that I'm trying to get ...
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1answer
953 views

R: Self-intersection error when using intersect with two shapefiles

I am trying to "translate" worldwide raster data to European nuts3 polygons. That means I try to overlap two shapefiles to find the average value on nuts3 level. Unfortunately, when I use the ...
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0answers
62 views

Highlight areas without overlapping Shapefies in QGIS 2.16

I have a dataset with several hundred shapefiles and need to ensure that there is at least double overlap throughout. I need a way to extract the areas without double overlap, or at least a way to ...
6
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2answers
3k views

Calculating proportional area of polygon within another layer's polygon using QGIS?

I have two polygon layers, model and ntem, whose features overlap and intersect one another. I would like to calculate the proportion of the area of the model polygons which fit within each ntem ...
3
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1answer
114 views

Buffer 1 to 1 relation in QGIS?

I have 2 layers ( geometric type - point), let's name it layer A and layer B. I need to find which points from layer B don't have their equivalents points from layer A. So i`ve made 10 meter buffer ...
2
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2answers
743 views

Clipping a polygon shp by one large polygon

I've seen similar answers to this question on so many forums but nothing seems to work. I have one large polygon (a country boundary) with another polygon layer that contains thousands of smaller ...
2
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0answers
2k views

Clip shapefile with shapefile

There are two shapefiles. One is a compilation of municipalities on the coast with borders extending into ocean. The second shapefile is a coastal border. I'm trying to clip the municipality ...
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2answers
514 views

Unable to intersect with search cursor on ArcPy?

I would like to loop through the shapes in the attribute table and create a new intersection point feature class for each row in the table. But every time I do this, I keep on getting the same error. ...
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0answers
118 views

Identifying rasters with specific attribute value that intersect polygon using ArcGIS for Desktop?

I have numerous raster files that each contain an attribute field "VALUE" that can take on the values 0 or 1. How can I identify rasters that have any of their "VALUE=1" cells intersecting a focal ...
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0answers
89 views

Create junction raster from stream and road rasters

I have converted two vector polyline datasets to raster format. One represents streams, and one represents roads. I need to create a third raster layer that contains cells where there are stream ...
1
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1answer
91 views

How to locate where shapefiles do NOT intersect? Two road datasets

I am trying to match a Canadian road dataset with a US road dataset in ArcGIS 10.1. One way to assess how complete the "matching process" is is by seeing where the roads intersect and where they do ...
2
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1answer
451 views

Cluster analysis using buffers and polygon features (NOT layer)

I have a point-based vector layer, where each point represents a road accident. I am trying to write a function that: Loops through my accident layer creates a buffer, of a given radius, around each ...
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0answers
125 views

Split disconnected polygons into separate features after using clip tool? [duplicate]

I'm working with a series of forest polygons (geodatabase feature classes), which I'm trying to clip to an area with a specific land use history (marked as "undisturbed" in the screenshot below)in ...
2
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1answer
498 views

Batch intersect and multiprocessing with arcpy

I admit what I am working on is way over my head, especially as I've only been dabbling in python for a few months. I am attempting to write a script that allows me to use Intersect analysis on about ...
4
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0answers
285 views

Counting nodata and data pixels using PostGIS

I'm using PostgreSQL 9.2.4 and PostGIS 2.0.3. I have some raster layer and I'm trying to get the count of all pixels (including nodata), cliped by polygon. Raster was imported by raster2sql: ...
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0answers
44 views

ArcMap 10.1 Intersect Not Adding Points at All Intersections

I have run the Intersect tool on a streets centerline layer. I tried it on a dissolved version of the lines and also a split version of the lines. The tool is not giving me a point at each ...
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3answers
2k views

openlayers extent intersects is not working properly

I am using ol.extent.intersects(extent1, extent2) to check for intersection between layers and polygon I drew, but it doesn't get me any intersection which is weird because I draw the polygon ...
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0answers
372 views

Double Iteration Intersect in Model Builder

I need to intersect two highly-overlapping shapefiles, the first with 60 polygons (ponds), the second with 3000 (lilly pads). A straight-up intersection does not work (60 x 3000 -- it runs for hours ...
1
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1answer
366 views

Intersect in QGIS returns empty shapefile

I've seen this asked and occasionally answered on the site, but none of the solutions applied. I am attempting to intersect points (i.e. NYC Motor Vehicle Collisions) to a polygon (i.e. a shapefile of ...
2
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1answer
7k views

Intersection of a raster and polygon in ArcGIS 10.3

I have two data sets one raster and one polygon. I am interested to see learning the area where the two overlap. I was thinking that I could use the intersect function, but since one of the layers are ...
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0answers
36 views

How much Vector Grid is intersected by another polygon layer using ArcGIS for Desktop?

I have a grid 5X5 sqkm and another vector layer with 2 different land cover type (let's say "forest"/"no forest"). I wish all the squares composing the grid to get a value ranging from 0 to 1 ...
1
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0answers
741 views

Python QGIS reliable intersection/overlap check between points and lines

In my script I need to check, whether a point I created stored in a memory layer lies on a polyline, which is in another memory layer. I am certain, that the point does overlap/intersect the line, ...
2
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2answers
2k views

Intersect with Raster data

I have ArcGIS 10.2.2 I have raster data over a whole state but am looking at just analyzing a specific county. I downloaded county polygons to overlay over the raster data to determine the area I ...
3
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1answer
5k views

Difference between Crosses & Intersects - Shapely (Python)

I have two questions : I have some lines (eg: road network). I want to find coordinates of each junction. Should i use crosses or intersects function from python's Shapely module? They are giving ...