Questions tagged [length]

The longest extent of anything as measured from end to end

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2answers
65 views

Calculating the length of two shapefiles in QGIS

I created the yellow area as a shapefile by hand. Then I calculated the perimeter. I also created another shapefile (blue) manually and calculated the length, see image 1. The next step was to ...
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0answers
53 views

Calculating the greatest length of a polygon using QGIS [duplicate]

I'm new to QGIS and I need to know the easiest way to calculate the greatest length of a polygon. I already know the "rule" tool but I want to do it automatically because I have a huge ...
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0answers
27 views

Calculating the longest path length in drainage network using Python

I have a drainage network and I want to obtain the longest path length between two coordinates of the shapefile; is there is a way to automate this process in Python? For example, in the image, I want ...
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0answers
31 views

Selecting, sorting, and grouping spatial data (lines) by length and proximity

I'm working on a project where I have a bunch of lines inside of polygonal land parcels. Here's a rough sketch of what I'm talking about: I need to further subdivide these parcels into sections that ...
2
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2answers
112 views

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 ...
3
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1answer
58 views

Automatically updating geometry attributes in QGIS without using Virtual Fields

I have a line layer and I computed the attribute "length" with the field calculator. After that, I changed the geometry of some lines with the editing toolbar. That means the values of "...
1
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1answer
49 views

Creating points along line based on line lengths

I have a road network network (polyline shape layer) with multiple line lsegments. Each line segment has different line length as shown in image 1. I am trying to generate points along lines based on ...
3
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3answers
74 views

Measuring distance between two points on curve line in QGIS

I am using QGIS 3.10 version. Image those two blue lines are points. How to measure the white line between those points?
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2answers
26 views

Does SDE.ST_LENGTH() calculate the true length of arcs?

Oracle 18c/10.7.1 EGDB I have a polyline FC that has features with arcs. Does the Oracle SDE.ST_LENGTH() function calculate the true length of arcs? Or does it only calculate the straight-line length ...
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0answers
51 views

Calculating length along multiple line segments in GeoPandas [closed]

I would like to calculate the distance between two points. They are connected with multiple line segments. Each LineString only consisting out of two points. How do I connect these LineString segments ...
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1answer
64 views

An application for measuring river length?

I'm aware of the coastline paradox and its application to rivers in that the measured length of a river depends on the resolution of the measurement. Is there an application that calculates the centre ...
7
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2answers
193 views

What is the maximum number of characters for a label in QGIS 3?

I am trying to determine the maximum number of characters for a label in QGIS 3. I am at over 1,000 characters and it does not display. Is there another way to display text on a map with a large ...
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1answer
34 views

Calculating length of line shapefile using PyQGIS

I have two lines that overlap, so I clip the overlap, and I should get its length in kilometers. The clip part is ok but I can't find any resources on how to get the length. It can be printed in the ...
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2answers
20 views

Measuring length in Southeast Korea projection

I have a GIS dataset currently projected in Web Mercator. Is there an option for a more accurate segmentation length projection when I need accurate lengths in Southeast Korea?
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0answers
189 views

AttributeError: 'NoneType' object has no attribute 'length' when running function for compactness

I want to calculate compactness indices for geometries I have in a geodataframe. I'm using the following function as was mentioned here (Measuring compactness in Python) by Kadir in order to ...
1
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1answer
60 views

Increasing length lines of shape

I am using ArcGIS Desktop Advanced 10.8. I have a polyline shape and I need to increase the length of all the lines 1000 meters. The lines have 2 vertex only. I need to increase the length from the ...
1
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1answer
439 views

Calculating length of polyline defined by list of coordinates using Python

I have a list of coordinates, knowing that I am working using EPSG:4326 and using Python I would like to calculate the length in kilometres of the polyline defined by these coordinates. Coords = [(0.0,...
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1answer
18 views

Find sublines, given initial and final offsets, via the command line

I have a CSV file that looks essentially like this: id,id_wkt,start,end,wkt 11,11,0,43,"LINESTRING(3.3623676 51.3132714,3.3626663 51.3130068,3.363068 51.3126811,3.3636323 51.3122504,3.3640754 51....
0
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1answer
363 views

GeoPandas: Get the maximum length inside a polygon

I'm having a a GeoDataFrame of polygons. I want to find the maximum length of a straight line that can fit inside each polygon. You could call this the characteristic length of the polygon. The length ...
2
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0answers
87 views

Finding distance of line segment considering elevation in QGIS?

Normal distance can be easily computed in QGIS. But how can I do it for a line feature in 3d space, simply saying how to to find the line's distance noting its elevation. For example, if a polyline ...
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0answers
9 views

Detecting how far a river runs along a boundary between two administrative regions when digitisation errors mean they do not coincide

I am trying to find the lengths of rivers within and on the boundaries of administrative areas ("districts"); I need to distinguish between the length within districts and the length along boundaries (...
-1
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1answer
32 views

How to label line features dynamically with its length? [closed]

I need to label a line feature with its length dynamically so the displayed length will be updated as I edit the line geometry. Is this possible in either QGIS or ArcGIS?
2
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3answers
422 views

Get LineString length in meters

I have a series of LineString that I want to have the length in meters. I use the shapely.geometry module, and importing LineString. I've seen this post, explaining how to do it, but it seems using ...
1
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1answer
40 views

Calculate length of paths with defined vertexes

I'd like to calculate length of some paths with defined vertexes and each route is characterized by some records. For example, I need the length of all combinations of lines (AB, BC, CD, AD, AC, BD). ...
3
votes
1answer
105 views

Joining fields with long field attribute names

I am working with the "Joins" option in QGIS 3.10, which joins the fields from two attribute tables based on a common shared attribute column. However, this does not work for attribute values with a ...
1
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1answer
81 views

Length of longest street using Spatial SQL

I have a table with the geometry of streets and I`d like to find out, which is the longest and which length (in kilometers) it is. How can I summarize the individual street segments?
1
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1answer
86 views

Getting bike lane length with QGIS?

I am trying to get bike lane lengths from the following data set. To do so I have tried using the add geometry attribute from the processing toolbox. I have tried both calculate using Layer CRS and ...
0
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1answer
67 views

Computing total road length in fixed radius circle around a point

I have a dataset of a number of points which are plotted on QGIS using their latitude and longitude. Now, I have to find out the total length of roads surrounding each point within a circle of radius, ...
2
votes
1answer
63 views

Adding $length on the fly when adding line feature

is there a simple way (without writing script or python skills) to auto calculate and auto populate length attribute in QGIS? When I add a new line feature in my layer, I'd like the attribute length ...
8
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4answers
682 views

Calculating polygon's length along a line? [closed]

I need to calculate the length of polygons along / projected on a line. An image to show the idea: I have thousands of polygons to be "projected" on lines to verify how many meters of the line they ...
2
votes
3answers
237 views

Finding accurate distance of a drawing in QGIS

Attached shows a rough drawn image of a pipeline track. I need to measure the pipeline track from one end to the other, e.g from the red and blue square to the other red and blue square, e.g from the ...
2
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1answer
76 views

Calculating the length of a single edge in QGIS

I need the correct length of a edge between to points(yellow line in the picture below) in the unit [m] for validation of an equation. I just found the possbility to add geometry (length) to the ...
3
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0answers
62 views

Lines length plugin - QgsVectorLayer error

Several similar questions have already been made, but none of the is helping me. I have a layer of polygons and I want to known the length of each line of each polygon. And based on the length I ...
5
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2answers
237 views

Different length measures in QGIS vs. ArcMap

I noticed that QGIS and ArcMap return slightly different length measures when calculating geometries (length) on one and the same shapefile (see image). In QGIS I used the $length command, in ArcMap ...
1
vote
1answer
53 views

Which coordinate system/ projection would you use to measure lines globally distributed?

Which geographic coordinate system /projection would you recommend to measure the length of hundreds of lines which are globally distributed (southern and northern hemisphere)? The lines have a length ...
1
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2answers
180 views

Measuring width of polygons, which is wider than long

Within my project I am trying to quantify and compare different submarine landslides with ArcGIS. Therefore, I created a polygon shapefile and mapped the spatial extent of each landslide. Now I want ...
3
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0answers
336 views

Calculate length of selected features in PyQGIS

I create a selection with getFeatures(QgsFeatureRequest()) and I want to calculate the length of the result which is a QgsFeatureIterator : select = QgsExpression(" myexpression ") selectedfeats = ...
0
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1answer
148 views

Determining percentage of overlapping lines using QGIS?

i have a lines layer that represents the bikeways of my city, and also have another overlapping layer that represents the bikeways that need repairs. How can i get an analysis of the percentage or ...
0
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0answers
33 views

QGIS KML lengths appear to be wrong? [duplicate]

Every time I import a KML into QGIS the line lengths are wrong. A line that was 191 ft on Google Earth is now 260 feet in QGIS. How can I solve this problem?
3
votes
1answer
368 views

Different results using $length (field calculator) in QGIS versions 2.18 and 3.0

I use the field calculator to measure the length of LineStrings in my shapefile layer, but i get different results when using QGIS 2.18 or QGIS 3.0. If I am using the local coordinate system the ...
1
vote
1answer
136 views

QGiS 3.0: Line length without overlapping parts

I have overlapping lines in my layer and want a total length of the visible line without the overlapping part. i.e. I have two lines First one goes A-B-C Second one is B-C-D How do I get the ...
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0answers
48 views

Calculating route length per grid cell using fishnet

I have a problem determining the length of the routes (boat) I've surveyed in order to calculate the survey effort. I added the GPS points of the boat and then used the points to line tool and added a ...
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0answers
133 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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0answers
143 views

Attributing polygons based on line attributes

I'm using QGIS 2.18. I have a grid that I need to calculate Azimuth and length for each side. Most have 4 sides but some ( see Gird C below) many more , up to 12. My process now convert Polygon to ...
1
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1answer
74 views

Maximum Length parallel line

I have a polygon and I want to make parallel lines inside of the polygon. I need to have the maximum length when I sum the length of all of them. Each line must be 15 m apart.
3
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0answers
158 views

QGIS - Parallel Lines - Count length of one

I have a large layer of lines (telecommunication duct) with in parts several parallel lines that are close to each other (cause they lay in the same trench). I would like to count the length of the ...
3
votes
1answer
250 views

Is there a way to calculate length of linestring from one point to another?

If I have one linestring and coordinates of two points on that linestring, what is the easiest way to calculate not shortest distance from those two points, but distance over the given road (given ...
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0answers
24 views

Calculating length of line using British National Grid projection? [duplicate]

I need to calculate the length of a line in (KM) in QGIS using the British National Grid as the Projection. Can somebody explain to me how to do this?
1
vote
1answer
1k views

Calculating length of polygon in ArcGIS Desktop?

I am using ArcGIS 10.2.1 Desktop with an Advanced license. My company has electric lines that go through people's yards. The areas around these lines require trimming occasionally, which necessitates ...
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0answers
206 views

Changing Virtual field properties in QGis 3.0

I have some existing virtual field with set Length and Precision An example: The formula was first set to rounding it by 2 digits With the current settings it displays 10.00 instead of 10 because of ...