Skip to main content

Questions tagged [measurements]

Measurement is finding a number that shows the size or amount of something.

Filter by
Sorted by
Tagged with
-1 votes
0 answers
24 views

Survey identified monuments but encroachment occurred in the middle [closed]

I had a survey completed for a property line dispute. He verified the monuments were found and for the most part align. The neighbors agreed to replace the fence and we agreed. However I see were they ...
Julia Durand's user avatar
0 votes
0 answers
30 views

Georeferencing HiRISE images (Martian North) in QGIS 3.36 for geometric calculations

I want to run various geometric measurements on Martian structures in QGIS. Therefore I downloaded a JP2 Black and white map-projected HiRISE image (https://www.uahirise.org/PSP_007372_2475). As I am ...
marla's user avatar
  • 71
0 votes
1 answer
100 views

Incorrect distances when measuring on QGIS, leading to buffers and density maps being much larger

I have created a boat traffic map on QGIS 3.36.2. Here, I have a vector layer containing different points connected to show the boat routes in the Andaman and Nicobar Islands in India. To ensure that ...
Amisha Nakhwa's user avatar
0 votes
1 answer
72 views

Measure area of a polygon on OpenStreetMap

How can we measure the area of a polygon on a OpenStreetMap map? It can be either: the area of a hand-drawn polygon, the surface area (at ground level) of an existing building It seems the standard ...
Basj's user avatar
  • 103
0 votes
1 answer
19 views

ArcMap 10.7 default measure

What is default measure in ArcMap 10.7? I use trace tool and I want create a 350 m long line. I am setting a length limit (Trace options), but I don't know what is default measure.
Barta's user avatar
  • 1
0 votes
0 answers
34 views

Uncaught TypeError when adding OpenLayers Measure tool to App

I am trying to add the Measure tool from Examples to my map application and keep getting the following error. Uncaught TypeError: Cannot read properties of undefined (reading 'getLayers') at ...
gwydion93's user avatar
  • 1,913
3 votes
1 answer
99 views

Transforming an sf feature without M-values into one with M-values

Basic question Working with the sf library in R, how can I add M-values to a geometry that doesn't already have them? Or put differently, given an sf feature without M-values, how can I create a new ...
Felipe D.'s user avatar
  • 2,699
0 votes
1 answer
54 views

Draw a square from dimensions entered in a form in QGIS-QField

I have a project in QGIS, I created some forms to create and modify some objects (point, line, polygon). When I draw a polygon, I always draw a square or rectangle, because I insert some manholes in ...
andrea verrastro's user avatar
0 votes
0 answers
49 views

Tool or plugin in QGIS that allows seeing measurements/area of polygon/line while drawing it

I am looking for either a tool or plugin in QGIS that allows me to view measurements and/or area while creating a ploygon/line. I know I can measure it afterwards, but I am specifically looking for a ...
Maja Thuren Jørgensen's user avatar
0 votes
0 answers
98 views

How to infer the cordinate system dynamically from a wkt point, for create buffers?

What about if you have a multiple point of the world? How can infer the cordinate system dynamically from a place in Python, for example Mexico, Brazil, Chile, Canada, etc.? The goal is to create a ...
Cristián Vargas Acevedo's user avatar
0 votes
1 answer
19 views

Measurement display while creating a vector layer

I am trying to display the measurement tool on QGIS while I am adding a vector to a vector layer I created. I am using EPSG 4326 and I cannot figure out how to use the measurement tool while creating ...
Eric Lebar's user avatar
0 votes
0 answers
29 views

"clear screen" function clears measurement components but changes the layer order

My work environment: OpenLayers 2.13.1, .Net Razor (*.cshtml), IIS 8.5 and Windows Server 2012 R2. When the "clear screen" function works after making a measurement on the map, the ...
backup's user avatar
  • 1
0 votes
1 answer
56 views

Measuring Coastline of the USA (NOAA)

I need to find the distance of the US coastline, I know that this is a tricky subject on account of there being several different ways to measure the coastline (and different scales). That said, for ...
Sebastian Espinosa's user avatar
3 votes
2 answers
138 views

Measuring border segment length while creating a polygon in QGIS

I am recreating historic (1770s) land parcels for an area of a town based on their description in written deeds. This will be a series of intersecting polygons when I am finished, with many sharing ...
Joe Bagley's user avatar
1 vote
0 answers
22 views

QGIS measure tool reporting distances of only 0.00m

I have an orthographic projection as a raster layer, a point layer, and a polygon layer all in CRS EPSG:6543. I am attempting to use the measure tool to collect the length of my polygon and other ...
ncsuaglab's user avatar
1 vote
0 answers
48 views

QGIS measurement tool seems unrealistic

I have created a buffer of 150m around a point. This should give (a polygonal approximation of) a circle with radius 150m. I tried to verify this with the measurement tool, and I am baffled to see a ...
AEF's user avatar
  • 123
1 vote
1 answer
482 views

Planar vs geodesic

My understanding is that geodesic is measured on the surface of the ellipsoid and is the always the shortest distance on the earth. Planar is just straight line distance. Is this the correct ...
Willy Yuan's user avatar
0 votes
0 answers
67 views

Change default unit for measure tool

Every time I open the measure tool in QGIS 3.28 I change the units to feet but it defaults back to meters. I tried settings -> options -> map tools & updated preferred distance units to feet,...
C. Scholze's user avatar
1 vote
1 answer
48 views

Distance between point layers in QGIS

I have data points where respondents have indicated where they were on vacation (variable pointsSH). In the attribute table of these data points is stored where the people live (the zip code). I also ...
user227676's user avatar
2 votes
1 answer
56 views

Calculating the straight distance of non-straight polyline in QGIS

I have a GIS layer of bus stops (MultiLineString), which contain the paint lines that are painted on the asphalt. The complete bus stop element is in a single MultiLine element. If I select it: I ...
Egidi's user avatar
  • 3,748
0 votes
0 answers
107 views

Calculating temperature from multi-spectral map in QGIS

I have a map showing heat islands in a large city in the form of a multispectral (RGB) raster. I'd like to obtain the temperature or at least a temperature scale (the ultimate idea is to be able to ...
SimGeographer's user avatar
0 votes
1 answer
74 views

Creating Multiple Instances of Measure Line [closed]

I'm trying to use multiple instances of the Measure Line and Area at the same time. More specifically, I need to measure setbacks from lot lines. The way Measure Line is set up, it becomes quite a ...
user224918's user avatar
1 vote
2 answers
164 views

Mergin Maps measure function available

Project works find. I use Mergin Maps on Windows 11. But I need an essential function: Measure area and lines Is there no function for that?
Volk_a's user avatar
  • 11
3 votes
2 answers
392 views

Generating lines at the end of each measurement with plugin in QGIS

It would be very useful to have a tool like this when measuring and even more useful to generate lines at the end of the operation. I use this plugin which is part of a small GIS program (Map Maker 3....
Frodo's user avatar
  • 2,407
0 votes
0 answers
155 views

How could I fix QGIS measuring incorrectly my distances?

I made a QGIS project to calculate some measures about the city I live in (in Belgium). Problem is, I noticed that I get very different results when measuring elements, in Google Maps vs in QGIS. ...
gordie's user avatar
  • 274
0 votes
1 answer
58 views

Is the Geo URI uncertainty a radius or a diameter?

Uncertainty is inherent in geospatial data... Maybe it's supposed to be obvious, and, some standards forget to define it. The RFC 5870 — A Uniform Resource Identifier for Geographic Locations ('geo' ...
Peter Krauss's user avatar
  • 2,304
0 votes
1 answer
58 views

In ArcPy I need code to transform M-value to coordinate X,Y

Input: route linear feature M-Value as input from text box Output: X,Y value I need code to convert a measure value to X,Y coordinate. The measure value is an input value.
Ugo Minelli's user avatar
1 vote
0 answers
175 views

Measuring real distance in QGIS

I created the linear shapefile of an ancient Roman Road (via Flaminia), and I would like to compare the linear total distance with the real one: Roman engineers and Gromatici measured the roads with a ...
Germana's user avatar
  • 11
1 vote
0 answers
97 views

Calculate edge length of a feature in layer WMS

How to calculate edge length of a feature and display the result on the corresponding edges in layer when clicking on that feature. Looks like this: This is my WMS layer: var myLayer = new ol.layer....
Jayzz's user avatar
  • 85
1 vote
1 answer
759 views

Calculation of the distance between intersecting lines, but according to existing lines

I will try to briefly describe, namely, it is a forest area and polygons mark some kind of reference area, roads are lines, and there are also tractor roads (the same lines) which in this case are the ...
sttipa's user avatar
  • 197
0 votes
0 answers
122 views

Inconsistent Line lengths and distance measurements

I've imported OSM data, including specifically LineString railroad tracks for different subdivisions. I want to distribute mile markers at fixed intervals, but am getting very different distance ...
wyskass's user avatar
1 vote
0 answers
186 views

How to compute theoretical GPS accuracy?

I'm a student and I am working on a GPS-like system. I have implemented a few algorithms (Newton-Raphson, Bancroft, ...) and I would like to compare them. Basically, I have a constellation of ...
ALEIXANDRE's user avatar
0 votes
2 answers
620 views

How get distance in degrees to calculate buffers in AWS Athena?

Athena only allows to calculate the distance of the buffer in decimal degrees but this value varies with respect to the latitude in the globe, tate to obtain a distance according to the following ...
Cristián Vargas Acevedo's user avatar
1 vote
1 answer
206 views

QGIS measure tool: How to edit default SR on ellipsoidal method?

When I use the measure tool on QGIS 3.22, about ellipsoidic method it says: "Coordinates has been transphormed in the choosen ellipsoid (EPSG: 7030)": this sounds strange because all CRS ...
SirB1's user avatar
  • 185
1 vote
0 answers
125 views

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 ...
Fitzy_A's user avatar
  • 71
3 votes
1 answer
5k views

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 ...
Franken's user avatar
  • 31
4 votes
2 answers
486 views

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 ...
anea's user avatar
  • 161
3 votes
1 answer
126 views

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 ...
user199903's user avatar
7 votes
2 answers
1k views

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 ...
Kate's user avatar
  • 109
0 votes
2 answers
127 views

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 ...
Deveena McLean's user avatar
0 votes
1 answer
139 views

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 ...
Vic's user avatar
  • 431
5 votes
2 answers
647 views

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 ...
najusten's user avatar
0 votes
1 answer
110 views

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 ...
Random34544's user avatar
10 votes
1 answer
723 views

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 ...
GeoGyro's user avatar
  • 1,656
4 votes
5 answers
2k views

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 ...
IberOikos's user avatar
4 votes
1 answer
3k views

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 ...
astaga's user avatar
  • 123
0 votes
0 answers
98 views

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 ...
Funkwecker's user avatar
1 vote
0 answers
39 views

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 ...
SSweet's user avatar
  • 19
6 votes
1 answer
191 views

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()<< "...
Puneet Kumar's user avatar
14 votes
2 answers
1k views

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 ...
zabop's user avatar
  • 2,224

1
2 3 4 5 6