Questions tagged [measurements]
Measurement is finding a number that shows the size or amount of something.
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Measuring length of polyline which overlaps polygon in ArcGIS Online
I want to measure the length of a polyline which is not completely within a selected polygon. I want only the length of the polyline which overlaps the polygon.
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Measuring tool crashes on QGIS 3.22.5
When I open the measuring tool to measure distances QGIS crashes. I am using the LTR Version 3.22.5. I have two small a layers in the projected to EPSG:28355 and base layers sourced from rest ...
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Сreating buffer in meters using GeoPandas
I want to use a built-in function buffer of GeoPandas. I want to create a buffer of 10 centimeters around the original geometry but buffer method take argument in degree, so what value do I need to ...
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2
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Grouping and measuring total length of road based on specific attribute in QGIS
I have this dataset that describes the cycleways of a city.
I want to measure the km of cycleway for each type of highway (residential, track, unclassified, ecc) and then calculate the percentage of ...
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Getting distance of lines between points on map using Distance matrix in QGIS
I created a Distance matrix from a vector layer of 36 points. I want to show all the distance lines between all the points.
In the Distance matrix layer, I click Properties > Symbology, then under ...
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Export kilometrage of line in shapefile to DWG/DXF
I've got a polyline in a shapefile (represents an electric-line). I want to produce a kilometrage (for intervals of 100m and 500m) for this line and finally export it to AutoCAD. When it comes to do ...
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2
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Creating square polygons of given length from single corner point in QGIS
I have 30 points, each one represents the SE corner of a 1.5 by 1.5m plot. I want to create polygons to represent these plots.
How do I create square polygons from a corner point and with a specific ...
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Calculating Commute Between Residential Address and Childcare address
I have an Excel sheet (10,000 + rows) that has the residential address and the provider address.
I am trying to see the distance a parent travels to drop their child off to their specific provider. I ...
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45
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Calculating distances between a set of coordinates
I'm using QGIS 3.2, WGS 84, EPSG 4326. I have a series of coordinates that represent the location of Red Squirrel trail cams in a Forest, there is another file with every sighting date and location ...
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Finding mean distance between cluster center and points in cluster in QGIS
I have done the following in QGIS: I used the integrated k-means clustering tool to cluster around 160k data points into 50 clusters. Using the mean coordinate tool (Vector analysis > Mean ...
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Will two GNSS modules displace by the same amount?
I am using two gps modules with blunos (bluetooth arduinos) too get the distance between them and display it on a phone. This has worked great and on avg Im getting the expected 5m inaccuracy.
However ...
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Calculating length of each polygon side in PostGIS
In PostGIS, I want to calculate the length of different sides of a polygon. I know how to calculate a perimeter but how to calculate length side by side?
Perimeter is as a sum of side's length so I ...
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539
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Calculating polygon area in QGIS without adding new field
Is it possible in QGIS to quickly calculate the area of a polygon using a Processing tool, plugin, script without adding attributes or creating a new layer?
Something launching the results window or ...
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Why ellipsoidal distance measured in EPSG:7030 in QGIS?
I measure distance (km) in QGIS (Ctrl+Shift+M)
.
In Ellipsoidal, it using CSR EPSG:7030.
In Cartesian, they didn't say what projection is used.
If it using ellipsoidal option, does it mean measured ...
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Can the Getis-Ord Statistic really be considered a measure of spatial autocorrelation?
The Getis-Ord statisic
G_i(*)= \Sigma_j w_{ij} x_j / \Sigma_j x_j
basically calculates a geographically weighted average at some point. Is it fair to say that it is rather a measure of spatial ...
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Geodetically correct point spacing accounting for change in elevation
I am trying to create a grid of points at a specific spacing (30ft) for setting up a new orchard on fairly steep terrain. I have tried using "create fishnet" in ArcGIS pro. This is giving ...
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What is the accuracy of DMS coordinates that don't contain any seconds [duplicate]
For example, if I have coordinates for latitude 50°52'N, about how accurate are these coordinates? Within 10 km? 100 km?
All the information I'm seeing is about decimal degrees, and I could convert ...
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88
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Calculating distance between two points using QGIS C++ APIs
I have been trying to find the distance between two points using QGIS C++ APIs in Qt. I used the following code :
QgsDistanceArea d;
d.setEllipsoid("WGS84");
qDebug()<< "...
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2
answers
553
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Why accurate area of all countries cannot be obtained using a single EPSG code, even if it corresponds to an equal-area projection?
I would like to check if using different equal-area projections lead to near-identical area estimation for a list of countries.
Importing modules:
import numpy as np
import geopandas as gpd
import ...
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40
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Required DLL for calculating distance between 2 points
I have been trying to find the distance between 2 points using QGIS C++ APIs in Qt.
I used the following code :
QgsDistanceArea d;
d.setEllipsoid("WGS84");
qDebug()<< "...
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48
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Calculate a straight or centerline of a polygon
I have drawn some roads as polygon and I wish to know if it is possible to calculate how long the roads are.
I imagine that somehow QGIS can figure out the centerline of a polygon and create or ...
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91
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Calculating distance of a path/vector through multiple points in QGIS 3.16.3
I created a .csv file with coordinates to show a route between two locations where I live. I want to figure out the distance one would travel to arrive from one location(A) to another(B). With '...
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Polyline don't show up when leaflet-measure starts - Django
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css">
<link rel="stylesheet" href="https://unpkg.com/...
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Get layer information with Python module in Agisoft Metashape
I'm working on photogrammetry analysis and I want to improve my process. Recently, I saw that Agisoft has a Python module available and I could use it to automate my measure.
I working on roofing ...
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1
answer
51
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Measure an angle on an orthophoto or on a dense cloud
I'm currently working on QGIS 3..10.1, and I would to analyse my roof with UAV analysis. I have already made a dense cloud, an orthophoto and a DEM on agisoft metashape but now I would make few ...
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2
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1
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352
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QGIS CRS WGS 84 problem with the scale and measurement
I have a problem with my map scale.
It shows 0:1 instead of proper scale.
I am not capable to make any measurements, as the values go wrong.
When I click on the measurement tool I get an error:
This ...
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73
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Measure between two images in QGIS 3.18
I'm currently working on QGIS 3.18 in the area of geo-referencing. I have two orthophotos (they are same) but the first one is untreated, the second was corrected by differential GPS. I want to ...
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478
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Measure distance in km of polyline in QGIS
As much as I have looked numerous times for how to measure vector polyline in QGIS I can not find the way. This seems like an easy thing to do but the answer eludes me. Dah!
After I have traced out a ...
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565
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Calculating semi-major and semi-minor axis length of an ellipse in QGIS
I have a layer that contains ellipse-shaped geometries. The layer has projected CRS and there are also rotated ellipses in the layer. I couldn't find a tool or plugin related to semi-major and semi-...
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Showing measurement in OpenLayers 6 while modifying
I have this code.
I create class the name is MeasurementClass. this class used for overlays component creator, setting of html and configure style . this class can handle it.
class ...
3
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1
answer
55
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Measuring distance between points in one layer and related points in a different layer in QGIS
I have two point layers. One of biological records which has an attribute field for the SiteID that the species has been found at. The second layer is a Sites layer with a centroid location for that ...
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2
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81
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Measuring the sides of a polygon one by one
At the moment I am working on an OpenLayers project or rather I am learning on a project.
I stumbled upon a feature:
When you click on a polygon on the OpenLayers map and that plygon is selected and ...
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83
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QGIS v/s MapInfo - Differences in Distance Measurements
Distance calculated in different software (MapInfo and QGIS) has given me differences in distance values. To be more precise, it's mostly happening when the distance is more than 25 miles. I doubt ...
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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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Measuring distance between two points using digital elevation model (DEM) and ArcMap
I have a number of points mapped on a digital elevation model (DEM). The points were mapped on the DEM based on their GPS location (latitude, longitude).
What is the best way to measure the distance ...
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Getting more accurate area size using QGIS
I'm using Natural Earth's shapefiles and try to match them to the real area size. I'm utilizing $area expression, but no matter what ellipsoid measurement I use the result seems to be very off. For ...
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Is it possible to convert QGIS 3 measure tool output to polyline?
I am wondering if it is possible to convert the results of the QGIS (3.16.0-Hannover) measure tool to a polyline (or shapefile). I need to make a series of linear measurements and would like to keep a ...
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95
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Advanced digitizing and measurement tool
I want to draw a polygon with 18m x 2m using the advanced digitizing tool. When I measure the size after creating with the measurement tool, the lengths of the sides do not match up (drawn sides vs ...
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Measurement tool of QGIS working in unsaved project but disabled in saved project
The measurement tool of QGIS 3.8 is working in the unsaved project but disabled in the saved project. I unable change the measurements or the units, and the Units dialog box is grayed out.
However, ...
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2
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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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Measuring tool and field calculator giving wrong area in QGIS 3.10.4
I've been consistently having issues with the QGIS measuring tool in 3.10.4. When I measure an area or line (regardless of the units) it gives a wrong value when compared to the measuring tool in ...
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108
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QGIS- Missing measure line box/point during editing
I've just updated my QGIS 3.4.4 to QGIS 3.10.8 and now I cannot measure distance and place point on measured distance. As soon as I click on to editing/adding point the measure tool box and line/point ...
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Creating custom scale measurement for QGIS project
I started to make a map based on a raster (a scanned paper map). The map obviously has not geographic coordinates or a projection.
The map comes with its own scale, and I would like to somehow make my ...
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QGIS - Inaccurate field calculator
When I retrace a polygon using the measure area tool and get what I believe to be an accurate area measurement. However if I utilise the field calculator within the attribute table to calculate the ...
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Measuring distance between certain relations in QGIS
I need to measure the direct distance between busstops in meters, not taking roads/networks into account.
I have the WGS 84 Coordinates + globalIDs for 28.000 pairs.
I already imported the Busstops ...
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393
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openlayers 6: measure tool dosen't show up drawn shapes
I am working on a laravel project, where I need to insert a map in the interface of my application.
I am using openlayers V6.3.1 to create the map with its basic tools.
I still have a problem, measure ...
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3
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132
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Clicking on route and obtaining measure or distance for that clicked point using QGIS
Is there a QGIS-equivalent of ArcMap's Identify Route Locations tool?
I do use the LRS plugin, but I don't see this functionality in that plugin.
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Restoring Measure tool window in QGIS?
My measure dialogue box seems to have taken leave of my QGIS. I've reviewed the previous answers about resetting the interface, checking for the dialogue box outside of view, all kinds of things.
The ...
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Getting accurate measurements in EPSG: 27700 using QGIS 3.10
When taking measurements in a project where all layers are EPSG:27700 (with elipsoid Airy 1830) the measurements produced are incorrect.
Is there a better CRS for distance measurements in the UK? Or ...
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3
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Finding length and width of regular/irregular polygons in QGIS [closed]
How can I find the length and width of regular and irregular polygons on QGIS? There's > 1000 so can't measure manually with the line tool.
I have perimeter and area but need the other two ...
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