Questions tagged [polyline-creation]
Used for questions about making polyline features
276
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Create polygon from a line
I have searched high and low and cannot figure out how to do this... I need to create a polygon based off a flight path, defined by radius to either side of the path. For example, if an airplane ...
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1
answer
60
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Creating Line from angle and distance using PyQGIS
In the user interface of QGIS I have the option to draw lines with the "Advances Digitizing tool", where I can enter coordinates of a point to set the first vertex. To set the second vertex ...
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52
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Converting roads line string to polyline covering all roads
I attempted it with a linestring of Australia exported as coords array from QGIS a while ago and tested using a special website where you can input a coords array which then displays as polyline.
Now, ...
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3
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1
answer
351
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Building the shortest route through all points in QGIS
How to build the shortest route through all selected points, starting from a given point? Which plugin to use?
There is a point layer and a linear layer for all routes between points.
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183
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Show shapefile data in Flutter app
In Flutter there is availability of one package which cost more than 6k USD per year, looking a affordable method for Flutter to show shapefile in a Flutter app with data lines between continents and ...
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Create lines between points layer and line layer (but not the nearest)
I'd like to create lines between a point layer and a line layer, but not in shortest line function in geometry generator. I using this command in geometry generator:
make_line (
$geometry,
...
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1
answer
43
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Making lines from points and classifying them by length in QGIS
I have a QGIS point layer with several points with no attributes except the Id field. I want to make a line from each point to the rest of the points. In addition, I would like to get two new fields, ...
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26
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How to calculate Beginning and End Intersections of Polylines?
I have ArcMap 10.8.2 and am working with road networks consisting of intersecting polylines. Each segment has its own ID and I would like to calculate its position relative to other segments.
The ...
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209
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Drawing line of given length in QGIS 3.22
How am I supposed to add a feature of a given length and/or at a given distance from another point?
In QGIS 3.4 I've used the Measure tool to mark the length then switched to "Add Feature". ...
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4
votes
2
answers
240
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Connecting points to line segments along path in QGIS
I have a set of points that fall along a trail, as in this image:
and I need to convert these points to line segments.
The points fall along a polyline, and points on the same line share a common ID &...
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2
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2
answers
66
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Connecting points by line number and code in QGIS
I am looking to connect points with a line using Geometry Generator or Virtual layer. Each point has a unique number, a code and a line number. The goal is to display in QField application the lines ...
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Extracting the channel banks' shapefile segments
I want to extract separate lines for left banks and right banks of a large channel network, and doing it manually sounds too tedious. Is there an efficient way to extract the polyline or vertices of ...
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Drawing fixed-length line from points layer towards nearest points on line in QGIS
Basically, I've used a buffer to find all airbases within 100nmi of a coastline. Now what I'd like to do for each of these points is draw a line a) to the nearest point on the coastline, and b) ...
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Decoding polyline in Python
By making Google Maps API call I received a response JSON which contained this polyline:
ezdvBcps}Lt@W@F@BVKl@UK]Wc@}@kAOKBEzA{BdA}Ab@s@LBf@RjARZBv@?rAAfBIX?f@FLBf@^b@hATbAF~@BvB?hALjBHpCLjAVdAd@...
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1
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Drawing line that is tangent to two circles in ArcGIS?
I have a series of not-quite parallel lines (stream transects) that I need to put into ArcGIS. The initial plan was to gather coordinates with GPS but topography, etc has eliminated that option. In ...
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50
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Creating parallel polylines in specific distance of existing polyline using ArcMap
I want to create two polylines on both sides of an existing polyline and parallel to it. I use ArcMap.
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Creating polyline that represents Mean shoreline position from set of 4+ polyline positions for that year using ArcMap
I am looking at tracking shoreline positions across a few decades and in order to remove the noise of seasonal change I want to create a mean shoreline position that represents several shorelines ...
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45
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Join line to point automatically with ArcGIS
Is there a possibility in ArcGIS to join automatically line with point, for example, with the image below?
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3
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Points to path does not group points to lines in QGIS
I often want to join sequences of GPS points to form sets of lines that represent periods of at-sea survey effort.
My GPS point file includes an integer "Order" field with unique values, and ...
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1
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175
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Creating line from center point, angle and length in QGIS
How can I generate a line with given center point, angle and length in QGIS?
I am analyzing that auto extraction lineament for geologic structure analyze.
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1
answer
86
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Selecting single line after polygon is split into line segments
In QGIS 3.20 on Windows 10 Pro 64-bit I have used the menu sequence Vector/Geometry Tools/Polygons to lines to create a new line layer from a polygon layer which contains several polygons.
However I ...
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2
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562
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Drawing lines between pair of two points with their coordinates in QGIS
I'm using QGIS 3.18. For my thesis I use coordinates of starting points and destination points. So far I uploaded these coordinates into my project which worked without any problems. The CSV-file ...
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1
answer
113
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Joining hub and spoke points by lines using Virtual Layer
I have two shape points as shown in image below.
Point 1 represents the connectivity nodes (hub)
Point 2 shows the address(spoke)
How to connect each hub (connectivity nodes) to nearest spoke(...
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184
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Creating longest line within polygon that crosses point
I am performing a morphometric analysis of dolines using QGIS. I want to generate longest axis within basin polygon that crosses the lowest point (from other layer) of basin. Is there a way to ...
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163
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Drawing line between two points from another CSV in QGIS [closed]
I have two large CSV files, one that defines the location of each point as:
point
lat
lon
attribute 1
And another that has data on what lines exist between them
point A
point B
attribute 2
...
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3
votes
2
answers
307
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Creating buffer (of line geometry) around polygon feature using QGIS
I have a polygon layer representing coastal cliffs and would like to create a line at a certain distance out to sea from this polygon layer (I drew a blue line on the image below to demonstrate).
In ...
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4
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287
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Creating line layer from point layer with start and end attributes in QGIS
I have a CSV file that contains attributes for a start node and end node of a pipe in a single record. This is data collected in the field, so the inspector captures the lat/long at each end of the ...
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120
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Choosing proper Order field when using Point to Path tool in QGIS
I'm practicing creating vectors/lines in QGIS 3.16.3 by uploading .csv files from Excel with Lat/Long decimal degrees, and then using the "Points to Path" tool to connect the locations.
I ...
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0
answers
42
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Minimum enclosing polygons for point clusters [duplicate]
I am trying to find an algorithm that can create minimum enclosing polygons from a set of points. The existing algorithms such as. Convex Hull, Concave Hull (both Alpha shapes and K nearest Neighbors),...
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Merging Line Segments to Eliminate Non-Junction Nodes in QGIS
I’m working with USGS NHDFlowline datasets (polylines representing US rivers and streams). I want to merge some of the line features so that nodes only occur at tributary junctions. For a generalized ...
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181
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Cutting out part of the vertices of polygon to create line (between two points)
I have a polygon which represents a water catchment. I also have a polygon that represents a national boundary. I would like to cut out a line that represents only the part of the catchment boundary ...
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76
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Getting distance between two points within polygon in QGIS
In QGIS 3.10 I have two layers, first one is point layer and the second one is polygon layer.
Every two points (with same "ID") in my point layer overlay with a single polygon in polygon ...
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151
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ArcPy polyline shape object to numpy array
I am learning to work with the geometry objects included in ArcPy.
I'm really interested in using them since I don't want to create files at all since most of the data I'm going to use is just mere ...
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227
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Enclosing contour lines along edges
I have contour lines that I am converting to polygons. Contours along the edge are clipped so are difficult to simply convert to polygons. So I'm trying to find an automated way to do this within QGIS....
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134
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Dissolving joining lines in QGIS [closed]
I dissolve lines with the same attributes. However, if these lines join, they cannot be dissolved. How can it be done?
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175
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How to plot arrow linestyle using GeoPlot sankey?
I am plotting line directions from the US to other countries on a map. I have both geo points of originators and destinations. I use gploy.sankey, however, I am unable to add arrows at the end of the ...
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60
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Adding linear distances along polyline segments (start/end stations) to attribute table in QGIS
This seems like a pretty simple application but I've been struggling to find the appropriate tool.
I have a polyline feature (a trail network) that contains fields with attributes about each segment ...
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1
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179
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Cannot draw straight line polygon in QGIS 3.16
I tried to draw polygon by using add polygon. It should be a straight polyline and then become a polygon but it turns to a curve line like arc (circular line) so that I couldn't draw a polygon. It's ...
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Creating "average" line from multiple adjacent polygons
I have a set of stream channels that are currently being represented by multiple adjacent polygons rather than by actual lines. See the green polygons in the image below. The polygons are essentially ...
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69
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Converting polylines as paths to polygons in one shapefile using ArcMap
I have acquired raw path GPS data where seabird colony boundaries were physically recorded and uploaded in the form of polylines.
A lot of these polylines are a bit messy and overlapping, but there ...
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2
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1
answer
142
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Using ArcPy to get point from a cursor for input in arcpy.PolyLine()
I am using ArcGIS Desktop 10.8 Basic. I do not have access to a Standard or Advanced license for this.
I want to use a point from a search cursor as an input for the arcpy.PolyLine() method. A second ...
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3
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282
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Creating multiple separate vector lines from list of coordinate pairs in QGIS
I'm a QGIS user with 2 years of experience but I don't know how to do this task easily. I'm on QGIS 3.10.6 A Coruna.
I know how to import CSV coordinate points and then convert them to a vector using &...
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187
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Drawing rows in field at the same distance from each other
I have to recreate on QGIS what you can see in the picture below. I have to draw those lines (tree lines) in my field. The rows need to be at exactly 10m far from each other and oriented North-South. ...
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51
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Clipping with Voronoi polygon using QGIS
I'm trying to clip a road network (polyline) with Voronoi polygons. The polyline don't clip but I don't know why. I try to separate my road network according to geographical points collected in the ...
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1
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97
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Transforming points into lines and calculating total distance in QGIS
I have a series of data, minutes and seconds that are associated with latitude and longitude. I would like to calculate the total distance within each minute, getting a value for each minute.
Now I ...
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576
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Calculating distance between points from CSV file in QGIS
I have a CSV-file with latitudes and longitudes and I should calculate the distance between the points in ascending order (distance from 1 to 2, from 2 to 3, etc.)
I tried with the distance matrix but ...
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150
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Creating line between point layer and line layer in QGIS
My goal is to create a line layer that is derived from the distance between a point layer and a line layer. An example could be using a line layer representing a road and a point layer representing a ...
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130
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Merging lines connected by vertices (avoide connecting overlapping lines)
I have a layer representing hydraulic network and I would like to merge the lines when they are connected to each other at their start/end vertex.
In the picture below , I merged the lines manually by ...
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2k
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Connecting points to lines in order using QGIS
I have a set of points and I want to create lines from them. Points belonging to one line have unique "UniqueID" to be grouped by. I try to use QGIS's "Points to path algorithm". ...
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Retaining Feature class Information Using Construct Polygons Modify Feature in ArcGIS Pro
I have a polyline feature I need to turn into polygons but I don't have the license which would allow me to use the feature to polygon tool. The workaround as suggested on the Construct Polygons From ...
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