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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Summing equal geometries with identical columns in QGIS
I have two vector layers with line geometries which share column names. The one is a subset of the other, and even though they share the same columns, they differ in their values.
I would now like to ...
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Rough conversion in SQL for decimal degrees to square meters/meters
I'm dealing with a database (Teradata) that doesn't have any support for anything other than decimals/decimal degrees. As a result I can't use any of:
ST_Area (can't get area in square meters)
...
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Finding overlapping line geometries (including subsets) in QGIS
I have a vector file with ~4000 line geometries. Some of the lines are overlapping, or more precise, it seems, that some lines are subsets of the longer geometry.
How can I find all overlapping lines ...
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Connecting two lines based on their value in ArcGIS Pro
In ArcGIS Pro 3.3 I have a layer of non-continuous lines that I want to connect based on depth values. Each line has a depth field (e.g., 0.3, 0.5, 0.8). I need to connect each line to the next one ...
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QGIS 3.34 Calculate area in curved geometries
I want to calculate the cartesian area of a curved geometry, a circle, with a radius of 2500 m.
First, I buffered a point with 2500 m radius and used the function "Convert to curved geometries&...
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QGIS Cannot reopen GeoJSON file after saving
I've recently encountered an unexpected issue with QGIS. When creating and editing a new GeoJSON file (collecting polygons), everything goes smoothly until I try to save. Occasionally, I receive the ...
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Storing OSM relations correctly as geometry in BQ
I am looking at the best/efficient way to decompose OSM relations and store as geography, currently I am using:
https://raw.githubusercontent.com/tyrasd/osmtogeojson/gh-pages/osmtogeojson.js
to ...
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ST_GEOGFROMTEXT Multipolygons converted to Polygons in BigQuery
I've stumbled upon an intriguing issue while working with MultiPolygons in BigQuery. When utilizing the ST_GEOGFROMTEXT function to parse a MultiPolygon containing multiple polygons, the output ...
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Setting map extents in print composer using a polygon layer?
I have a group of data points that need to be encapsulated within different polygons. I have used the geometries by expression tool to generate a layer of these polygons. I'm trying to feed the ...
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How to clip multipart polygons in ArcGIS Pro using editing tools
I have numerous multipart polygons running along corridors that I am trying to "split" at intersections. The polygons may or may not be present at the intersections, but there are always ...
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Draw line and calculate distance from each no adjoining side polygons to perpendicular nearest side polygon
From a polygon geometry layer representing building boundaries, I show a screenshot:
I would like to calculate, for each building polygon, the distance from each side of the polygon that has no ...
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Defining filter of QgsMapLayerComboBox as layer without geometry with PyQGIS
How to define the filter of a QgsMapLayerComboBox as a layer without geometry with PyQGIS?
Below I share examples of how to filter points, lines, polygons and raster layers. But layers without ...
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Difference between datatypes GEOMETRY and GEOMETRY(GeometryZ, 32618) in PostGIS
I have just started working with PostGIS, Just curious which is the correct format to store 3D data in PostGIS, Although both are giving same results:
CREATE TABLE buildings_3d (
id Int ...
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Geometry still set as point when creating lines in QGIS Geometry Generator
I'm using QGIS to analyze coastal erosion and have come across an issue with geometry type. I have a vector layer of about 150 control points along the shoreline and used a geometry generator to ...
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Is there an established mapping from longitude-latitude to the face of a icosahedron?
Given a longitude and latitude, I’d like to map that to the face of an isocahedron projected onto the sphere (earth). The orientation of the isocahedron doesn’t matter so if there is a convenient or ...
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