Geographic Information Systems

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Use for questions about the ArcGIS Intersect tool

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Extracting number and attributes of points in a GRID in ArcGIS

I will be thankful if someone can help in extracting the number of points with attributes using the grids. For example I want to know number of species points in a grid with attributes. I have ArcGIS ...
2
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1answer
33 views

Intersect overlapping entities and their attributes

I have a shapefile containing 6 classes of polygons on QGis 3.14. Some of these polygons overlap each others, but they're not geometry errors or duplicates, just polygons with different attributes. ...
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1answer
37 views

How you get values within intersect layers and autofill attributes to another layer form when creating a new object

When im creating a point that intersect on an polygon, how you can get values from attribute polygon and autofill the attribute in the point layer. There will be some code? I´m using qgis 3.12 ...
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19 views

QGIS: Intersect two polygons, one line layer as Output

I have two polygons that intersect, now I want to calculate the length of the outline of the new polygon, but only the outline it shares with one of the input polygons. Is there a way to enter two ...
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1answer
47 views

PyQgis Intersect line with polygons. Result is not Correct (some of polygons result not intersec the line)

I have a track (Line) and I want to know wich countrys/cities (Polygon) intersect this track. I try in two ways: a) With PyQgis - I use QgsSpatialIndex().intersects(track.geometry().boundingBox()) ...
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8 views

ArcMap Intersect Tool is missing just one intersect point of two polyline shapefiles?

I'm trying to find the intersect of 2 polyline shapefiles. One shapefile is a long line (of multiparts), the other shapefile is 11 straight lines that "fan out" radially. The ends of the first ...
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0answers
27 views

How to add raster value with specific equation?

I am trying to develop a raster layer with the interference of streetlight in this example: As you can see there are multiple buffer rings around a point layer. I actually want to transform this ...
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1answer
30 views

Using ArcPy with Intersect and loop

I am new to scripting. I have around 4500 small shapefiles to be intersected with one big shapefile. The primary key is to make 4500 small intersected shapefiles. How to do it correctly by using ...
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40 views

Intersect_analysis in ArcPy “The table was not found.”

Is there a bug in ArcPy? I have two features I want to intersect in a feature data set using ArcPy (this is a small part of a bigger program). Let me preface this by saying that when I do this in ...
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0answers
19 views

Adding attributes to intersected polygons from corresponding columns R

In short, I have a set of 10 polygons in Pol_large, that I want to split to individual polygons by intersecting (intersecting areas become new polygons, and old ones get cropped). In result, I am ...
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1answer
67 views

QGIS Intersect tool produces two copies of intersected line

I'm using the Intersect tool in QGIS 3.10.3 on two line layers A and B to create the intersecting layer C. I can then use the Difference tool to subtract A-C and to subtract B-C, resulting in three ...
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1answer
45 views

How can I get the points where two line shapefiles intersect?

I have two shapefiles that I want to compare and get the points where they cross. I would like to avoid opening QGIS or GRASS since I am trying to automate a process so I have been looking at OGR, ...
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2answers
46 views

Seeking QGIS tool for auto correcting address ranges at new intersections

I do public safety GIS, which is primarily centerline work. A tool that I have found indispensable when creating intersections where I don't have exact address point data is the Intersect Line tool ...
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1answer
495 views

Line and polygon intersection in GeoPandas/Python

I am trying to intersect two GeoPandas data frames, the first one is the street data (streets) and the second one is a buffer (polygon) around a point (buffer). I want to find the intersection of ...
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63 views

Clip/Make difference between line and polygon layers [QGIS]

I need to clip one layer out of another, both are vector layers (one of them i got from vectorizing a raster layer). When i try to clip out "LowNitro" out of "FlandersAgriculture" Intersect doensn't ...
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2answers
40 views

Ignoring overlapping polygons within same feature class when using Intersect tool of ArcGIS Desktop

I am attempting to intersect two feature classes, one of which has many overlapping polygons. I don't want to calculate the intersection of overlapping features within the same FC, but instead only ...
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34 views

Finding matching point of two layers

I have two layers in ArcGIS: Highway layer (9000 data points (or values)) Safe zone (4 types of values i.e. safe zone, medium zone, bad zone, and worst zone). Now I want to do analysis to see how ...
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1answer
29 views

Query polygons using ogrinfo but not generate a new layer

I want to list the polygons in my layer A that intersects other polygon B, using ogr. The desired result is similar to "Select by location" tool in QGIS or ArcGIS Desktop, where I expect an index of ...
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2answers
205 views

Find points within polygon with PostGIS really slow

From some millions of points I am trying to select those points that are within a polygon and save them into a new table. Both datasets with spatial index and both on projected coordinates. The query ...
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1answer
580 views

Overlap Analysis in QGIS

With QGIS 3.8 a new Tool has been introduced: Overlap Analysis. It says that it "calculates the area and percentage cover by which features from an input layer are overlapped by features from a ...
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1answer
36 views

Specifying output location of iterated Intersect tool results using ArcPy?

I have created a code that iterates through a geodatabase, intersecting each feature with a road network. I am not sure how to make it so the intersected features are output into a new geodatabase. ...
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1answer
37 views

Adding vertex where point intersect in ArcGIS Desktop?

How do I add a vertex to a line or polygon where a point feature intersects it? I am using ArcGIS Desktop.
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2answers
193 views

Using Update Cursor within Search Cursor with ArcGIS Pro?

I am new to using ArcPy/Python and I'm running into problems with a script I'm trying to write. I'm using IDLE Python 3.6.8 ArcGIS Pro 2.4.0 Here is what I'm trying to do - I have 2 feature classes: ...
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0answers
38 views

How to clip polygon such that only regions in 'line of sight' from a point remain

I am using ArcGIS. My point represents a monitoring station and is located within a polygon representing a river catchment. I have created a buffer of 300m representing the detection range of the ...
2
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1answer
120 views

Selecting points within fishnet grid cell with criteria of at least 3 unique values using ArcGIS Desktop?

My goal is to create a raster from points with values based on at least 3 unique IDs within a cell. Cells that had fewer than 3 points with unique IDs will have value NA. See below for clarification. ...
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13 views

Subtracting features from one layer using another layer in ArcGIS Desktop? [duplicate]

I have 2 layers of land parcels for a particular area (shown on top of each other like so): The darker parcel lines and road polygons are from an earlier parcel map. The land has been developed and ...
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2answers
216 views

Finding overlay/intersect shape percentages using QGIS? [duplicate]

I am working on a project in which it's necessary for me to overlay 2 layers (a map of precincts and a map of census tracts). I need to be able to determine the %area of each census tract covered by ...
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24 views

Automating Cluster Assignment of Grid Squares?

I'm using MapInfo. I have a grid layer which has results assigned to each grid square. I'm wanting to automatically assign cluster references using a minesweeper style approach, i.e. where grid ...
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0answers
15 views

Retrieving which Polygon contains a point

I am using the ArcGIS Online and have a layer within a map. Within the layer I have several polygons. When I load the map via the com.esri.arcgisruntime library, I was able to load the polygons as ...
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0answers
56 views

Clip/Intersect tool stopped working

I am using ArcMap 10.5.1 I have been using the Clip tool to cut out the amount of a given habitat type found within individual buffers around individual samples. After successfully executing this ...
2
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1answer
326 views

Why does spatial join on geodataframes return empty result?

I have two geodataframes that I want to perform a spatial join on; one is points, one is polygons. They are both dtype: int64. They both have .crs = {'init': 'epsg:4326'}. I have verified both of them ...
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118 views

Joining attributes by location/intersect works for all but one polygon in QGIS?

I used the Join attributes by location and Intersect tools in QGIS 3.4 for my points layer to add a column with name of the intersected area into the attribute table of points. It works perfectly for ...
4
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3answers
462 views

Intersect multiple layers at once QGIS

I'm very new to QGIS and am just learning the intersect function. I have about 10 polygons that overlap (not perfectly) and one layer of about say 15 points. I want to know with which of the polygons ...
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0answers
32 views

ArcGIS Pro Unable to Pairwise Intersect Point with Polygon?

I am trying to create a point from XY coordinates then use Pairwise Intersect to determine the corresponding parcel. The intersect is not returning any values. Any thoughts on the error in this code? ...
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1answer
44 views

In ArcGIS 10.6, how do I build a model to intersect iteratively?

This is my first time building a model from scratch, so let me know if I've omitted anything in describing this question. I have a geodatabase that contains shapefiles (polygons) of watersheds. I ...
2
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1answer
51 views

Identifying intersections in ArcPy?

I have two shapefiles: one containing a single polyline feature, and the other containing a number of polygons. I'm trying to use ArcPy to identify which polygons are crossed by the line, and then ...
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1answer
30 views

Select records from shape that do not match another table's values

New to the forum, so I apologize for my bad English and if I'm being inconvenient somehow! I read answers that are similar to my question but none of the ones I found fits my case. I have a shapefile ...
2
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1answer
59 views

Determining if raster can be clipped with polygon using ArcObjects?

Using ArcGIS 10.4.1 ArcObjects with geoprocessing. I have an input feature class with 100s of polygons and also one raster. I iterate through each polygon and clip the raster and then do additional ...
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1answer
90 views

Calculating total area from two intersected polylines using ArcGIS Desktop?

If two polylines intersect with each other and there are more than 2 intersect points, there is more than 1 closed area will be created. How can I get these areas as polygons in ArcGIS Desktop? For ...
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2answers
175 views

Java GeoTools API: getInteriorPoint does not work on an intersection between Polygon and MultiLineString

I'm working on a Java project using GeoTools API that want to get the interior point getInteriorPoint(), from the geometry coming from an intersection between a Polygon and a MultiLineString. Please ...
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1answer
172 views

Is Geometry object intersect faster than Intersect_analysis in ArcPy?

I have a script attempting to identify Many-to-Many matches between two different parcel layers. It is an iterative process, during which I dissolve the selected polygons in layers A and B, intersect ...
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1answer
335 views

Finding polygons that overlap other polygons within same layer using ArcPy? [duplicate]

I have a shapefile containing polygons. I would like to select all polygons within the layer that overlap with other polygons within the same layer. The closest I have gotten is the Intersect tool ...
0
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3answers
242 views

QGIS: Intersect rasterdata with vectorline

I am new to QGIS. My aim is to be able to get information of the height at any point on my vector line. My raster is a map with height information in the format geotiff. The vector layer is in the ...
3
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0answers
53 views

Specific intersections [closed]

I have a polygon layer that looks like this i.e. they overlap. When I run an intersection between the layers, I get more polylines i.e. for the circle on the top, the three lines get split because of ...
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0answers
45 views

How to output file with all overlaps between two Shapefiles - Neighborhood/Zip Codes [closed]

I have a pretty specific problem I would like help with. I have two shapefiles: neighborhoods from https://www.zillow.com/howto/api/neighborhood-boundaries.htm zip codes from the census bureau: ...
0
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1answer
47 views

Performing Intersect of polygon with raster, retaining ID of polygons? [closed]

I have a raster data set of land cover and a set of residential addresses (points). I want to find out what percentage of each land cover type is within 1km of each address (i.e. in a 1km buffer ...
2
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2answers
358 views

Combining two spatial tables in PostGIS

I have two PostGIS tables with geometries. One with number attributes and one with letter attributes. Each table has two features (rows). I would like to apply a operation on both stables so that I ...
4
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3answers
261 views

Using postgis to flatten all polygons in table

I have a table with many polygons. The polygons all have a name and a value. I want to flatten these polygons so that each polygon border remains as border to the resulting polygons. Instead of ...
0
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1answer
68 views

Intersecting data in ArcGIS ModelBuilder?

I have 432 suburbs polygons and an open space dataset comprising polygons I need to extract for each individual suburb the open space polygons inside and those which straddle the suburb boundary (Not ...
1
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1answer
552 views

Speed up intersection, union in PostGIS?

I have three tables: water, wetlands and parcels. I want to update parcel table with area that is covered by water or wetland (they can overlap). So I want to Merge water with wetland Dissolve and ...

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