Questions tagged [linestring]

A sequence of point coordinates referring to the line segments connecting them, as used to represent a one-dimensional feature or object.

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14 views

Spatial Analysis: use of buffer function inside GeoDjango's LineString model

I'm trying to make a buffer around a line. I've a model with a LineString field and I would to use the buffer function like this to make my buffer. The aim of this is render the buffer on a webmap ...
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64 views

How to create a linestring from a geopandas data frame?

I am trying to create a linestring from a geopandas dataframe with points as geometries date_time latitude longitude year data01 hour minute data02 0 2019-11-08 08:21:38 36.830444 -...
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38 views

Seeking algorithm that can re-locate vertices on linestring so that line does not intersect land polygons

I'm currently working with GPS data gathered from boats. The data has low temporal resolution (every 5 minutes) which causes the linestrings that display the boat's trajectory to be jagged. An example ...
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52 views

PostgreSQL create line from points

How do i create a linestring from points sort by date in PostgreSQL? I tried: SELECT observations.id, ST_MakeLine(observations.geom ORDER BY observations.date) AS newgeom FROM observations ...
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34 views

Copy/pasting QGIS features between two layers with linestringZ() geometry gives linestring()

I'm puzzled: when I copy-paste a feature with linestringz() geometry to another layer I get linestring() and the elevation attribute is lost. Although when I paste to a text editor I see a linestringz(...
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21 views

Mapbox: Multilinestring Z, stand on the background

I added to Mapbox, a 3D not extruded object by geojson: a Linestring Z. But it's stand on the background. So: I'ts possible to put this object at the height that is defined?
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23 views

Batch open GeoJSON LineString from files with multiple features

I want to open multiple GeoJSON files, each have Points and LineStrings - I only want the LineStrings. I want to open potentially 1000s of files so don't want the popup asking if I want Points or ...
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26 views

Combining Multiples Linestrings into Polygon (Turf.js)

My main goal is to combine linestrings into a polygon. Is there a way to accomplish this using a library like Turf.js, or are there any geometrical rules to follow ? I Tried building the concave hull ...
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20 views

Merging overlapping GeoJSON LineStrings (Tippecanoe) and add visualization

I would like to merge overlapping GeoJSON LineStrings and visually style merged LineString. I have a database of GeoJSON LineStrings which represent routes people drove. I would like to visualize ...
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25 views

Extend LineString on map zoom [closed]

In OpenLayers 5, I have some LineString that represent the streets. Now I want that when the map is zoomed also the LineString should be zooomed. For example in the following image, I have two ...
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87 views

Extract borders from country polygons

I'm trying to convert a polygon GeoJSON of countries into a line layer that contains only the borders. It should not contain the edges of the polygons that border the ocean (in my polygon dataset, ...
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36 views

Controlling line width at different points in QGIS [closed]

I have vector data for rivers including their width at various points. From what I have seen so far, QGIS 3.8 can set the line width only per linestring, no per segment. Is it possible (maybe with a ...
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84 views

Line at map scale that do not vanish when zoomed out? (QGIS 3.8)

I'm drawing rivers and roads as linestrings with width set in map units from an attribute. When zooming out, of course they vanish quickly, because 10, 20 or 100m is less than a pixel at 1:100,000 ...
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AGOL REST API: Why do linestrings auto-convert to multilinestrings w/ 0 z elevation?

I'm using the ArcGIS Online REST API to add/delete features from a 3D web layer. I'm able to POST linestrings to the layer. But, seemingly randomly, some (not all) of the linestrings get converted to ...
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Calculate weighted azimuth/bearing of a line

Given the line LINESTRING(-9.086532643219698 -7.939337106873815,-1.396102955719698 -0.9775148048290135,-0.780868580719698 -0.7138718839794582,-0.077743580719698 -0.6699297767574899,0.581436106780302 ...
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33 views

QGIS splits line feature at all intersections? [duplicate]

I have a long GPS track that I've converted to a shape file. I need to divide it into segments. The first time I use the "split features" tool, it makes a cut where I draw my line, but also splits the ...
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58 views

QGIS Linestring rendering curves between vertex

I'm sure I hit a setting somewhere, but now I can't fix it. When a linestring shp file is rendered in QGIS it adds curves between my verticies... I want straight lines. How do I turn this off? In ...
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106 views

PostgreSQL: Copy the line segment together in another table without copying the intersection with another line segment

Presently these linesegments are in different rows but in the same table and numbers shown in the image are the ids of respective linestrings. I want to copy linesegment 350, 333, 352,4,.. in one ...
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122 views

Measuring / calculating curvature of linestring using QGIS?

How can I measure/calculate the curvature of a linestring? I need just a boolean value: is curved or is not curved. At the moment, I don't find a working strategy for that.
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66 views

How can I smooth LineString coordinates with 1D Gaussian Filter?

I'm trying to smooth a LineString through 1D Gaussian Smoothing and I'm having a doubt on the steps required to implement it, regardless of programming language. I couldn't find by myself anything ...
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101 views

Converting lat long strings to xy linestrings [closed]

In PostGIS, I have a dataset with road segments including a column with coordinates for the various segments. The coordinates are in a lat-long format and the data type of the column is character ...
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24 views

Is there a standard way to apply different field values to linestring vertices?

In QGIS I have several 3D points that I am creating a linestring from and each point could have a different value in one of the fields like "type". I want to somehow create the linestring and be able ...
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53 views

Behaviour ST_Intersection of 3D LINESTRING and 3D POLYGON - Z value with GEOS backend

I do not quite understand the behaviour of ST_Intersection applied to 3D geomerties when using the GEOS backend. Take this example: SELECT ST_AsText(ST_Intersection('POLYGON((1 1 1, 6 1 3, 6 4 3, 1 4 ...
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91 views

Converting point into line using QGIS

I have a set of points with datatype as geometry(MultiPoint, 32643), I want each point to be converted in short line segments. The purpose of doing this is to use "split by lines" tool in QGIS which ...
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224 views

QGIS SAGA split lines at points creates redundant lines

I have 2 projected (ESPG 2039) layers of roads and points (bus stops and junctions). I snapped the points to the roads layer and this is how it looks: I then try yo use Saga Split lines by points to ...
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“bending” lines to a predetermined shape

I have a dataset with AIS-transponder information. A AIS-transponder is a digital system onboard a ship that sends/receives information to/from the vessels within range of the VHF transceiver in a ...
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179 views

Create a line string from street geometry

I'm currently facing some hard times trying to create a simplified line from a street geometry. The data that I'm currently using comes from OpenStreetMap, using osm2pgsql.(Which means PostGIS, but I'...
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40 views

Check point in line segment not accurate in Shapely

I use Shapely and I've run into an issue where I can find the intersection of two lines. However once I have the intersection point, I don't seem to be able and cross-reference that it belongs in both ...
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214 views

Getting geohash of LINESTRING in PostGIS?

I have some LINESTRING in PostGIS. LINESTRING(104.011 30.637,104.014 30.638,104.022 30.640,104.026 30.645) LINESTRING(104.022 30.666,104.031 30.659) LINESTRING(104.044 30.655,104.056 30.655) I ...
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325 views

Add Line Layer from PostGIS to Leaflet

I have a line layer in PostGIS that I would like to add to a Leaflet map. I have the PHP setup, but I can't seem to get the Javascript correct. I know my issue is converting the line to geoJSON. The ...
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137 views

Can I reorder the coordinates of a line when importing into QGIS a WKT linestring?

I managed to import a csv file containing lines in QGIS but unfortunately the x y aren't in the correct order. that is, the csv has a field where there is a sequence of lat (y), lon (x), while qgis ...
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118 views

Converting CSV with LineString into shapefile using ArcGIS Desktop?

I have a CSV which I've imported into ArcGIS Desktop, and it contains a Linestring column. How do I convert it into a shapefile? Example of what one of the fields contain below: [[51.53878768021,...
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79 views

Shapefile lines disappear, but data remains

I'm working in QGIS 3.4 on a line type shapefile layer with +/-5000 records. I made an edit to the start/end nodes of a couple of lines to move them to a point node from another layer; then when I ...
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89 views

Geospark - Creating LineStringRDD from coordinates extracted from the sides of each polygon in a PolygonRDD

I am using geospark 1.1.3 with scala and I am trying to split into lines a polygon shapefile dataset which contains 189 polygons. I am expecting to get each side of each polygon as a LineString, ...
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59 views

Mark Dangle Error for linestring

I will create buffer for 5 meter in start point of line string, If any other line string is within the buffer but not snapped then to mark as the startpoint as dangle error.I have attached the sample ...
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86 views

Matching streets in two line datasets with PostGIS or QGIS?

Explanation: I have 2 tables on PostgreSQL, one table named 'city' that have linestrings wich represents streets from a city (using QGIS I downloaded OpenStreetMaps data and imported to PostgreSQL ...
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37 views

Segmentation of a line based on several overlapping lines within the first line

I stumbled over a problem which I can't figure out myself so maybe you can help me.. I have a line going from 0 to 100% of its length. On this line I have 1:n lines with different information and ...
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186 views

OpenLayers Linestring does not draw straight images

My problem:Add image along the LineString My problem has been solved here, but when I add a 32x32 image and I draw between two points, the images in the line don't go straight and there's a slight ...
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57 views

Stop detection on a dataset of (id,geometry points,timestamp) to be transformed into meaningful trajectories

My pretty large dataset consists of AIS transmitted messages. I load the dataset to a table in my db. Among other columns in this table, there are a longitude and a latitude column. I already ...
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How can I calculate the “average” or “median” result between a number of MultiLine Strings?

So I have a number (let's say 12) of multiline strings representing something that changes over time, like forest borders or shorelines. I want to create a single line that is the result of the ...
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1k views

Add image along the LineString

I am wondering how to place images on a line. For example, instead of a dotted or dashed line. I could include a symbol of a cloud a character (e.g. |) repeated along the line. it cannot show the ...
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How to add date to point?

I have a lot of points with a GPS tracker and I need to simplify them. I create view (location_view) in PostgreSQL (with PostGIS): SELECT location.id, location.added, location.latitude, ...
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138 views

Change from LineString to MultiLineString when saving layer edits in QGIS

In QGIS, when a user creates a new single part line in an open editing session for a “Multi-Line” SpatiaLite dataset, the QGIS data type is initially a “LineString”. But, when the user commits the ...
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101 views

PostGIS MakeLine issue

I am using GPS coordinates and I am trying to create lines (routes) from lon,lat. I create a geography column from my point and then I create the line as following: ST_MakeLine(point_geom order by ...
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1answer
396 views

Slow PostGIS line intersection even with indexes

I have line data contained in different graphs. Querying data over multiple graphs and using st_intersects results in slow queries. All lines are represented as geometry(LineString). I am querying ...
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141 views

Cluster LineStrings using HDBSCAN?

I am trying to cluster a set of LineStrings (made out of lat/lon Points) with the help of HDBSCAN (using the "haversine" metric). The objective is to define the most "usual" path. I have only managed ...
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63 views

SumLineLengths in QGIS 3.2 not working?

I'm trying to use the Vector > Analysis Tools > Sum Line Lengths in QGIS version 3.2.3-Bonn. I'm inputting a ploygon (Multi Polygon) and a Lines (MultiLineString) shape files. I'm hoping to get the ...
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1answer
176 views

Calculate polygon main dircetion and create line from it - POSTGIS

I would like to find out the orientation of a polygon and create a line of that direction. See image below.
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69 views

Lines overlaping in same layer - PostGIS

I have lines overlapping in one layer as in image below. How do I delete one of these lines and leave the other one in the dataset?
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1answer
232 views

Select only lines that touch both sides of polygon - PostGIS

I want to select lines that only touch both sides of a polygon. Is there a function in postgis that can do this? See image below. I only want to select lines from the circle on the left where the line ...