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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Direction of lines in relation to coastline

In ArcMap 10.7, I would wish to calculate an orientation of some linear off shore features in relation to the coast line. I don't really want to create a classic wind/rose diagram in relation to North/...
Dominik's user avatar
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30 views

Saving a GeoJSON file with UUID [closed]

I would like to save a .geojson file with a geometry information as well as uuid column. The .geojson file is saved successfully when it has no uid column but when I add a uid column i get an error (...
bravopapa's user avatar
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2 votes
1 answer
75 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 ...
Ben Dauphinee's user avatar
2 votes
0 answers
34 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. ...
G_BOP's user avatar
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1 answer
27 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 ...
ZZZ's user avatar
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1 answer
26 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=...
bravopapa's user avatar
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1 answer
62 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 ...
Chamika Kasun's user avatar
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1 answer
16 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 ...
Irving Bennett's user avatar
6 votes
2 answers
96 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 ...
RedM's user avatar
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1 vote
1 answer
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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 ...
davehughes87's user avatar
2 votes
1 answer
69 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 ...
Mauro_F's user avatar
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40 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 >>&...
Sabina's user avatar
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1 answer
22 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 ...
mikipero's user avatar
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35 views

How QGIS's "Remove duplicate nodes" actually works

I am working on digitizing a large number of polygons using stream digitizing, which sometimes creates duplicate nodes. I noticed that in "Layer Properties>Digitizing>Automatic Fixes" ...
Tkerr1's user avatar
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27 views

How to fix the error in GML: non-planar polygon distance

I have validated the GML data in the CityDoctor. It found the error "GE_P_NON_PLANAR_POLYGON_DISTANCE_PLANE" in nearly all of the buildings. Is there a short way to fix such an error?
Gülce's user avatar
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3 votes
1 answer
129 views

From Geodataframe to PostGIS

I have a geodataframe which I am trying to save to a postgis database. I have already created a connection to postgis in pgAdmin (username, password, localhost and table) from geoalchemy2 import ...
bravopapa's user avatar
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6 votes
5 answers
493 views

Finding overlapping polygons within the same layer in QGIS

I have a polygon layer and want to check if there are some polygons overlapping within the same layer. How can I do this? In ArcGIS, I could run the Intersect tool only by adding the layer I want to ...
Motti's user avatar
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0 answers
31 views

Error in projecting a shapefile from CRS of ArcMap to a Proj4 string

I am trying to export the outputs of the National Water Model (https://github.com/NOAA-Big-Data-Program/bdp-data-docs/blob/main/nwm/README.md) inside of a basin using Python. With this code I called ...
ssaa's user avatar
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1 vote
0 answers
31 views

ST_COVEREDBY passes using geometry but fails with geography

I have a table of points and a table of polygons in PostgreSQL 11.18 and PostGIS 2.4.4. Both use Geography SRS 4326. CREATE TABLE my_points ( id integer generated by default as identity, geom ...
narmaps's user avatar
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1 vote
1 answer
152 views

Reading single feature as dict into GeoDataFrame with GeoPandas

I have a Leaflet map where a user can select a feature and be able to download some data for that feature. I'm getting the object like this to pass to Python: data = { "type": "...
MKF's user avatar
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1 answer
142 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 ...
SKSLH's user avatar
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4 votes
1 answer
104 views

PostGIS: Convert geometry type from MultiLineString back to LineString

I am working with a PostGIS database where I want to alter the geometry type from MultiLineString to LineString. My table used to be a LineString, so I know that all lines are simple, single line ...
e-shirt's user avatar
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0 votes
1 answer
61 views

Generate lines from given azimuth and points in GeoPandas

I am reading a points shapefile containing the azimuth information in the attribute table, and I want to generate lines from these data. I have tried to use shapely.Point as a tool, however it can't ...
台師大洪偉豪's user avatar
1 vote
0 answers
70 views

Calculating the surface area of the ocean at each latitude

I am trying to get the surface area of the ocean at each 1° latitude slice. However, for some unknown reason, region -61 which is at latitude -61 has a negative number, and am not sure why that is the ...
Lilnet Cloud's user avatar
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0 answers
44 views

Transformation needed for placing cartesian coordinate rectangle on map using geographical coordinates

I have come across a requirement to convert rectangle image with specific width and height to geographical coordinates so that it can be placed on map. I have all the four geographical vertices for ...
OnDWay's user avatar
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3 votes
2 answers
124 views

Unifying touching polygon within polygon geometry in PostGIS

I have a polygon geometry with 100+ polygons originally converted from a raster table - see the below image Zoomed view of one of the polygons I would like to unify the touching polygons (i.e. ...
rm167's user avatar
  • 459
0 votes
1 answer
119 views

Alternatives to Compute Pole of Inaccessibility in Python?

I discovered the other day that Shapely's current implementation of the polylabel algorithm for approximating a polygon's pole of inaccessibility does not always produce a point within the polygon. ...
Chris's user avatar
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4 votes
2 answers
238 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) -> ...
Alexander Petrushyn's user avatar
4 votes
1 answer
75 views

Deleting NULL geometries and duplicate nodes from table using PostGIS

I run the command to delete null geometry from a table: delete from table where geom is null And delete duplicate nodes by running the command: update table set geom = ST_Multi(ST_Simplify(geom,0)); ...
Paul P's user avatar
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1 vote
0 answers
93 views

How to find the coodinates of a new bounding box from four circles present with known radius around the vertices of an existing bounding box [closed]

I have a bounding box which I have created. I know the lat lon of the four vertices of the box. On these vertices I have created a buffer circle of radius 10m and now I want to calculate a new ...
sneha_jerin's user avatar
1 vote
0 answers
44 views

Viewing source query/code of the plugin "Check Geometries" in QGIS

I am running a plugin "Check Geometries" to determine the topology errors. It's running smoothly. But I want to have a SQL or Python query out of the executed process. For all other tools ...
SA_417's user avatar
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0 votes
0 answers
34 views

Landsat 8 geometry of image

I'm trying to find actual geometry of the Landsat 8 image. I retrieve Landsat data from ONDA service using EODAG. Onda provides Landsat 8 images in TIF files in epsg:4326. And it looks so: Also, in ...
Nikita's user avatar
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0 votes
1 answer
76 views

DISJOINT and TOUCH between Polygon and LineString not working as expected in Oracle Spatial

I have the following 4 geometries in an Oracle Spatial table: A) POLYGON ((-100 40, -100 44, -96 44, -96 40, -100 40)) B) LINESTRING (-99 37, -99 40) C) POINT (-100 41) D) POLYGON ((-96 41.5, -95 42, -...
Yndigo Dream's user avatar
1 vote
1 answer
70 views

Can I use WGS 84 and geometry calculations to check if a point is inside a polygon?

I'm storing polygons in a PostGIS database. The shape of the polygons is stored in a field of type geometry(Polygon,4326). From time to time, I need to check if a point (of type geometry(Point,4326)) ...
JPFrancoia's user avatar
-1 votes
1 answer
270 views

QGIS new versions 3.28, 3.30... One part can not be selected, vertexes too, can't work with multi polygons, One part is "Hole lies outside shell"

I am currently stuck on working with polygons with QGIS versions from the new patches with the new styles (3.28, 3.30, maybe 3.26 too etc...) When I used previous versions of QGIS, for instance 3.16 ...
Viktor's user avatar
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1 vote
0 answers
53 views

QGIS: multipolygon vector shapefile -> problem to correct latitude

I am currently working with QGIS for my master thesis (without much previous experience). I was provided with a shapefile containing MPAs (marine protected areas: see picture below). The latitude is ...
Débora Carmo's user avatar
0 votes
1 answer
96 views

Adding polygon geometry to numpy array to plot it with background

I'm trying to plot image I treated in dataframes. I need to add geometry to it in order to plot it with a background. I should have used GeoPandas and geodataframes in the first place. I have arrays ...
sam's user avatar
  • 33
-1 votes
1 answer
153 views

Get "geometry column" error when importing my csv file on Google Earth Engine through asset tab

I want to localize my plant specimens on Google Earth Engine map by importing a CSV file with two columns, including longitude and latitude, which belong to Quebec province, Canada. After I select my ...
Mobina's user avatar
  • 7
2 votes
0 answers
62 views

MultiPolygon - removing polygons intersections in PostGIS [closed]

Having a MultiPolygon, I would like to get a MultiPolygon where each polygon has no 'holes' and there are no polygons intersecting with each other. How to achieve this in PostGIS? To give you an ...
Marcin K's user avatar
4 votes
1 answer
63 views

Grouping features with identical values in two fields and deleteing the geometry with the lowest value in the third field using QGIS

I've got a shapefile with three fields: "X", "Y" and "Z" they are the geometries as well but I also have them as field values. Every line geometry in the shapefile has a ...
sistema's user avatar
  • 41
1 vote
2 answers
110 views

Create a longer line segment from a shorter one?

I do not believe my math is incorrect. This is seems like it could be a projection issue. I start with the following two coordinates ( lon, lat in degrees ) a: [37.821055535000085, -46.84417083099993] ...
Eric G's user avatar
  • 113
0 votes
1 answer
67 views

Geometry of recently created point

Description I am currently working on a project that requires the creation of default values in certain fields when attempting to insert a new feature. This operation is illustrated in the figure ...
Diogo Barros's user avatar
0 votes
0 answers
29 views

Geometry calculation in ArcMap

I am using ArcMap 10.8. I have many point (i.e. off-scale) bridges for which it is necessary to calculate the strike azimuth of the symbol. How can I do this? I know about the "line bearing" ...
Ярослав Вингард's user avatar
2 votes
0 answers
108 views

Geometry comparisons in SQL

Newbie to GIS here. Equality can be defined on a geographic value by seeing if they have a collection of the same points. For example, something like: -- The equality -- `LINESTRING(1 1, 2 2) = ...
David542's user avatar
  • 131
6 votes
3 answers
241 views

Unable to use the tool "difference" after the tool "clip"

I have stumbled on an error and I would like to have an external point of view to maybe help me figure it out. When I clip layerA as input with layerB as the overlay, and then make the difference of ...
Elyum's user avatar
  • 63
4 votes
1 answer
137 views

Removing duplicates geometry rows in PostGIS

I am maintaining a table which has geometry datatype and it's possible that the table can contain duplicate geometries. If I want to remove duplicate rows or select only non-duplicate one, will both ...
postgis-user's user avatar
4 votes
3 answers
222 views

Changing orientation of all polygons at once with numeric value in QGIS

I want to change the orientation of the raster/polygons with a numeric value around the centroid of the total grid. I have tried rotate($geometry, 45) in the Field Calculator but nothing happened.
N_LLC's user avatar
  • 605
-2 votes
1 answer
119 views

PostGIS: ST_LineMerge can make LineString from MultiLineString [closed]

I am trying to convert MultiLineString to LineString with PostGIS: This is my query: SELECT (st_astext(ST_LineMerge( geometry ))) AS shape FROM public."Cities" where id = 364087; but the ...
Cyrus the Great's user avatar
0 votes
1 answer
59 views

PyQGIS - draw a line between start- and endpoint using tracing to fit into another line

I have 2 vector layers, "pipes" and "fibres". The lines in the pipes layer are already drawn. Now i want to draw a line in the fibres layer from a start point to an endpoint, but ...
André's user avatar
  • 357
2 votes
1 answer
97 views

PyQGIS - modify Z-values for Polyline

I have a GeoJSON file that I have loaded into QGIS as a LineString, and draped over a DEM using Drape (set Z value from raster) I now want to round the Z-values to 4dp before exporting the modified ...
Tom Brennan's user avatar
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