Questions tagged [geometry]

(1) abstract geometry; (2) storing geographic data in projected coordinates; (3) a generic ESRI term for vector features; a class for "geometry" objects.

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58 views

Backup table does not replicate geometry, fed by trigger in pgAdmin (postGIS)

I have two tables, A and B. B is a backup of A. Table A has a trigger: CREATE OR REPLACE TRIGGER trigger AFTER INSERT OR UPDATE OR DELETE ON A FOR EACH ROW EXECUTE FUNCTION ...
1 vote
0 answers
68 views

Road data merge weather condition

I have a shapefile that shows fog, wind and precipitation values ​​between 1 and 5. Additionally, this file consists of grids. My goal is to segment the OSM road data that fall into these grids in ...
4 votes
1 answer
108 views

Making building orthogonalized in QGIS

From the left polygon to right polygon, May I know how to achieve it by using QGIS? I have tried the orthogonalized tool in QGIS, but there is no change in shape.
8 votes
7 answers
17k views

Convert 3D WKT to 2D Shapely Geometry

I have the WKT of many linestrings which contains three dimensions, however my script only requires a two dimensional linestring and I therefore want to discard the third dimension. My current code, ...
0 votes
1 answer
2k views

Converting a WKT column to type Geom

I have the following table in my MariaDB database: This table contains a column called 'coordinates' (type: LONGTEXT) with a wkt representation of either a MultiPolygon or a Polygon. I am attempting ...
-1 votes
2 answers
124 views

Locate or find holes tool in QGIS for polygon shapefiles [closed]

I want to locate or highlight all the holes (invalid interior rings that do not connect at all vertices and edges) and redundant geometry in a polygon shapefile in QGIS so that I can go back and ...
1 vote
1 answer
73 views

Intersection between polygons. Is gpd.sjoin adjustable?

I am looking to intersect two polygons. See picture below: The intersection is between the pink polygon (the small one) and the purple polygon (the bigger one). My issue is when I do the intersection ...
0 votes
1 answer
731 views

How to determine the order of shapely's intersection function between two LineStrings

I want to find all the Point intersections between two shapely LineStrings. It is possible that there are multiple intersections and hence the output can be a MultiPoint. How do I know that the output ...
5 votes
3 answers
17k views

"AttributeError: 'GeoSeries' object has no attribute 'coords'" when accessing coords property of LineString using GeoPandas

How can I access the .coords property of a LineString in GeoDataFrames? I can access other properties, such as area, length, etc, as documented in the Shapely's documentation. See reproducible example ...
0 votes
1 answer
20 views

Obtain specific geometry type when connecting to WFS through Arcgis Pro

I connect to the WFS and I successfully receive Polygons, as this seems to be the first geometry type it creates, but this WFS also has lines and points. How to specify the type of geometry I want to ...
1 vote
1 answer
265 views

ArcPy insertRow asking for a sequence of values

I've got code that pulls the center point from a layer, and places it in a new feature class as part of a more complex analytical process. I'm trying to get the centroid written to an in_memory ...
2 votes
1 answer
113 views

How to extract the overlay line geometry length using geopandas?

How can I extract the length of line geometry that is overlying each hexagon of h3? Sample Working Example: import h3 import geopandas as gpd import matplotlib.pyplot as plt import pandas as pd import ...
3 votes
1 answer
2k views

Removing vertex from Polygon geometry in OpenLayers 5

I could able to remove the recent modified vertex of a feature using removePoint method of modify interaction, as well as using deleteCondition event of modify interaction. However, that is not what I ...
1 vote
1 answer
709 views

Creating a Point with SRID - MariaDB

I have a table containing a longitude and latitude (as doubles) in MariaDB. What I'm trying to do is create a point with a specific SRID - 4326. The current way that I create a point is by using the ...
1 vote
1 answer
888 views

How do you make a GEOMETRYCOLLECTION valid in SSMS?

The following query is used in an app to make shapes valid, however it does not work when using GEOMETRYCOLLECTIONs. I get the following error: A .NET Framework error occurred during execution of user-...
2 votes
1 answer
193 views

Copy geometry only from one feature class to another based on condition

I'm trying to use ArcPy to copy only the geometry from one feature class to another based on a certain condition. Here is my code so far: source_fields = ['contition_field', 'SHAPE@'] icursor = arcpy....
4 votes
2 answers
402 views

Smoothing corners in polyline using PyQGIS

I have an array of QgsPointXY that makes a line with lots of vertices. How can I round the corners? Here is what I mean: The code is: def __round(line: list[QgsPoint], radius: float) -> ...
3 votes
0 answers
287 views

Measuring orthogonal distance of line from point in QGIS [closed]

I am fairly new to QGIS. I'm trying to measure the distance between points in a point Layer P and the end of lines in a line layer L. In L there are two categories (attributes) of lines, L1 and L4. ...
9 votes
4 answers
3k views

Replacing existing geometry in QGIS 3

In QGIS 3 does anyone know how to copy the geometry of one feature and paste it into another selected feature to just override the geometry? Within PostGIS I did this with an update, but I'm looking ...
2 votes
2 answers
181 views

Fixing holes in the buffered polygon using PyQGIS

My script uses a buffer and dissolves to create polygons around my points. However, there are holes in between the points. I do not want to increase the distance because then it will also cover the ...
1 vote
1 answer
177 views

Converting layer with multiple geometry types into single layers using PyQGIS

I'm developing a standalone script in PyQGIS and have downloaded data from OpenStreetMaps via Overpass Turbo. The data is given as GeoJSON and has been converted to gpkg. It contains multiple ...
25 votes
7 answers
49k views

Filling holes in polygons using QGIS

Is there an option in QGIS to fill holes in polygons automatically by setting parameters e.g. maximum area, distance between borderlines? I want to delete/fill holes that a very "thin"/small....
0 votes
0 answers
57 views

How to extract the Lat and Long coordinates used to create the boundaries of polygons in a shapefile using QGIS

I have a shapefile that contains 10 polygons that represent 10 legal fishery management zones. I would like to extract the latitude and longitudinal data points used to create each polygon so that I ...
0 votes
1 answer
313 views

Read GeoJSON object in a CSV file column and transform it to geometry

I have a column ('geo_shape') that contains GeoJSON object type of linestring geometry and, so far, I didn't manage to read and transform it to a GeoPandas/shapefile type of geometry. Here is a way ...
0 votes
1 answer
181 views

Raster to Point in ArcMap: export raster data to a point shapefile with geometry of a given point shapefile

I want to export a calculated raster to a point shapefile with predefined geometry (i.e. positioning and extent of the points). Points not covered by the raster should return empty values (e.g. NoData)...
4 votes
2 answers
2k views

Connecting two nodes with line to close segment in QGIS

I have a line that I drew where the ends are not connected. I now want to select the two end nodes and hit a button to have QGIS connect them with a line segment. How do I do this?
2 votes
1 answer
95 views

Generating offset line from MultiLineString in QGIS

I have a MULTILINESTRING in my CSV file, and I want to generate a copy of it offset to the right by a few meters. I've run Single Sided Buffer, and Offset Lines, and neither of them seem to generate ...
0 votes
1 answer
583 views

Geo search MySQL table for rows that are within proximity

I have an sql table that has some data on retail locations with lat, long coordinates. My application queries the table to pull the data using python. Here's some sample data: table1 id name lat ...
0 votes
1 answer
350 views

Unable to insert geometry point using TypeScript and MassiveJS

I am trying to simply trying to validate a point before I actually insert it into the db. I am using the following: TypeScript: 3.5.2 MassiveJS: 6.4.0 PostgreSQL: 11 PostGIS: 2.5 const ...
1 vote
1 answer
426 views

Automatically running an ST_AsText query over multiple rows in QGIS

After my SpatiaLite database got corrupted, I used a recovery tool to recover what was lost. I now do have the database, but I can't visualise the features on a map. I figured out that with SELECT ...
6 votes
2 answers
116 views

Is there a common method for measuring "curviness" of a line?

I have a bunch of GPS tracks in a Postgres+PostGIS database and want to extract a single metric as a measure of turns shown in the data. Some of the GPS targets travel in almost straight lines while ...
143 votes
14 answers
75k views

What are Definition, Algorithms and Practical Solutions for Concave Hull?

Convex Hull A convex hull of a shape is defined as: In mathematics, the convex hull or convex envelope for a set of points X in a real vector space V is the minimal convex set containing X (Wikipedia)...
1 vote
1 answer
1k views

Finding intersection length between two polygons using PyQGIS?

I have two polygons and I want to find the intersection line length between these polygons. for geom1, geom2 in itertools.permutations(selection, r=2): intersection =geom1.geometry().intersection(...
1 vote
0 answers
69 views

How to recognise building type from polygons?

I have a number of building polygons which are extracted from the aerial images, along with their postal address. (The aerial images are not available in my case.) For example, the polygon of a square ...
7 votes
1 answer
209 views

Check Geometries Plugin - attribute value in results

What does the real value of Sliver polygon represent? it's not the area of the polygon it's not the perimeter is not the area of the bounding box so I ask if anyone can tell me what it represents, I ...
2 votes
0 answers
53 views

QGIS converting MultiPolygon to MultiSurface - can I disable QGIS from doing this?

I have MultiPolygon data stored in a PostgreSQL DB (13.9) and am editing this through QGIS (using 3.28.3-Firenze). Occasionally when editing, some features are saved back as MultiSurface features. ...
0 votes
1 answer
44 views

How to find if a point feature is snapped to a line using ArcObjects

Background to the problem: When I use the Editor Split tool on a line, the line gets split into 2, and a junction is placed between the two lines. When I use the Editor merge tool, the 2 lines are ...
1 vote
1 answer
465 views

Align set of satellite images

I have a problem my set of four satellite images (4 different years of observations) of the same area are not aligned and more than that I see that there is a distortion problem also. I found this ...
33 votes
1 answer
52k views

Storing GeoJSON FeatureCollection to PostgreSQL with PostGIS?

I am new to GeoJSON. I have a GeoJSON features collection as shown and would like to store it in postgres table (testtable). My postgres table has a serial id and geometry column. { "type": "...
-1 votes
1 answer
50 views

Error in gpd.join related to 'PyGEOSSTRTreeIndex'

I have an error related to gpd.sjoin which shows as follows NameError: name 'PyGEOSSTRTreeIndex' is not defined Here is the code: alltitresQuartiers = gpd.sjoin(left_df=transactions_located, right_df=...
5 votes
3 answers
595 views

Finding the name of the geometry column for QgsVectorLayers using PyQGIS

I have a QgsVectorLayer whose data source is a vector GeoPackage file. How can I find the name of its geometry column? It is possible to use ogr to get it, but I am looking for a native PyQGIS ...
0 votes
1 answer
90 views

Calculating distance between two points on line string

I have a line string and two points with me. I need to understand how to calculate the distance between two points along the provided line string. Also, note that in some cases, the provided points ...
1 vote
1 answer
109 views

City Suburbs Polygon using OSMNX

I am trying to do something similar to the question OSMNX - City Suburbs Polygons. The city of Panama, in the Republic of Panama, is composed of corregimientos (like a borough). I am trying to get the ...
1 vote
1 answer
54 views

How to extract polygon attribute based on point location using QGIS expressions

I'm using QGIS 3.34. I have a point layer that contains a single point showing a site location (called "Site Location"). I have a polygon layer covering the UK with 12km squares containing ...
2 votes
1 answer
78 views

Multiple operations within Field Calculator using the same IF statement

I have 2 layers (Point_Orien_Vert - red points and Point_Centroides - green points), both are Point Geometry. I need first to check if the distance between one feature in Point_Orien_Vert and one ...
0 votes
0 answers
147 views

QGIS Convert Polygon ZM to Polygon

QGIS Convert Polygon ZM to Polygon Received files that have Shape > PolygonZM I need to attach to Polygon. QGIS: Geometry >< Polygon (MultiPolygonZ) I managed to get it to Geometry >>&...
16 votes
2 answers
5k views

Difference between QgsPoint, QgsPointXY and QgsGeometry.fromPointXY() in PyQGIS

I am using PyQGIS. What is the difference between: QgsGeometry.fromPointXY(QgsPointXY(x, y)) QgsPointXY(x, y) QgsPoint(x, y) When I print these three options, I get: print(QgsGeometry.fromPointXY(...
6 votes
2 answers
1k views

Creating geometry less memory layer using PyQGIS

I'm writing a QGIS plugin and I need to create a table with some attributes that, in a second moment, I'll load in a SpatiaLite database. The table is created as a memory layer, but as I said, it is ...
8 votes
4 answers
4k views

How to determine if an object is a circle

I have a polygon shapefile that consists of many different shaped features. I would like to identify only those shapes that are circles. Is there a way to do this? Is it a calculation I could do in ...
0 votes
1 answer
34 views

Apply Edits on ArcGIS not updating geometry

I am using this command on ArcGIS curl --location 'https://services8.arcgis.com/xxxx/arcgis/rest/services/SM2/FeatureServer/0/applyEdits' \ --header 'X-Esri-Authorization: Bearer ...

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