Questions tagged [measurements]

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

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2answers
44 views

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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1answer
47 views

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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0answers
62 views

Use “meters at scale” with custom CRS

[QGIS V.3.10.3 A Coruña] For streets in my fantasy world map I want to use a line ESRI shapefile. My custom CRS is a lonlat one and looks like the following: GEOGCRS["unknown", DATUM["unknown", ...
2
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0answers
48 views

Advanced Editing Options in ArcGIS Pro

In QGIS there are "Advanced Editing Tools", which are able to measure distances and angles of the feature being digitized as you are drawing it. Does ArcGIS Pro also have this capability? I have a ...
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1answer
26 views

On the fly/Dynamic measuring not working on Measurement Widget with different Basemap

I am developing an application with OS Open Carto Map as a Basemap and I have added a Measurement widget in the app. The measurement widget works fine for when the points are clicked for distance and ...
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1answer
75 views

Which map projection is suitable for distance measurement purpose in USA?

I'm developing an application which uses PostGIS functions for measurements in the USA. In nutshell: the software is running in a car and use PostGIS functions in real time. For example: to measure ...
2
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0answers
39 views

Measuring line input in attribute table

I'm using QGIS 3.10.0 A Coruna. I have a polygon layer (buildings) where I would like to measure each side depending on its geographic direction (north, east,...). I'm using the tool "Measure Line", ...
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0answers
25 views

Distance be between points: XYtoLine “Length” different from Add Geometry Attribute (geodesic) “length geodeisic” (ArcGIS Desktop)

I have a set of coordinates (WGS_1984) for patients home locations (Point A) and the first facility they visited (Point B). I want to calculate the distance between point A and B for each patient. I ...
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0answers
53 views

Different distance when using “Measure Line” tool and manually with scale in QGIS 3

Using QGIS's "Measure Line" tool I get a distance of 1.22km between two points. But if I use the scale indicated at the bottom of the screen, 1:50000, and measure with a ruler, the distance is 2.5km (...
3
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1answer
73 views

QGIS under measuring distances

I want to create some transects and a grid with specific lengths, but I realized Qgis is under measuring distances. For the transects I used "Advanced digitizing" (100m lines) and for the grid I used "...
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1answer
59 views

Measure part length of polygon using QGIS

I have a polygon file of area boundaries and I want to measure part of the polygon lines in each area which next to the sea. Is there a way to do this? In theory I guess I could edit and make ...
2
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1answer
47 views

Projecting and Measurements

I am looking to project all my data into EPSG::2959 (NAD83 CSRS UTM 18N) as I am working out of Ontario, Canada. Every time I start a project I set the project CRS to EPSG:2959, and then begin to add ...
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0answers
44 views

QGIS wrong measurments on Google satellite images

I am new to QGIS but I understand the basic principles. I'm working with QGIS 3.8.3 on OpenSUSE Tumbleweed Linux using the KDE environment. Still trying to figure out QGIS, I'm opening a brand new ...
2
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1answer
53 views

Holding horizontal and vertical lines while measuring in QGIS

Is it possible to hold horizontal and vertical (similar to Ortho mode from Autocad) lines while using the measurement tool in QGIS?
2
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3answers
126 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 ...
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0answers
96 views

'Generate Points Along Line' Tool in ArcGIS Pro: Measured Distance Not Matching Up

I have a line feature that, when using 'Calculate Geometry' in ArcGIS Pro, shows me it is approximately 7,000 US feet long. I want to generate points every 10 feet on the line, and input that ...
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0answers
73 views

Distance in advanced digitizing not working properly?

I'm trying to remap a papermap of a festival with QGIS. I tried to use the advanced digitalizing tool to set the right distances and angles between the point but noticed that the distance I put in isn'...
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0answers
246 views

Calculating azimuth of direction in OpenLayers? [closed]

I am developing an application with OpenLayers and I need to calculate the angle between two segments or directions. I thought about getting the azimuth of those segments and then calculate the ...
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0answers
58 views

Assessing quality (accuracy and precision) of digital surface model (DSM)?

I have been trying to build digital surface model from stereo satellite images. I do some initial research of it, it looks like I have to go outside and manually measure the height of an object (...
1
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1answer
69 views

Difference between a GNSS receiver and GNSS antenna

I´m relative new using GNSS data and I would like to understand a little more about the instruments that I´m planning to use in my future research. I was looking information on the UNAVCO website ...
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1answer
142 views

Customized Albers Equal Area Conic projections are cosmetic only or do they affect area calculations too?

I will be doing area calculations for 100+ countries using country polygons taken from GADM, a database of global administrative areas. I am using ArcGIS. The GADM data is in WGS84 and is unprojected. ...
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0answers
32 views

Measuring distance traveled, in 3D using ArcGIS Pro?

I'm working in ArcGIS pro, I have tracking data from a bird's flight path and want to know how far the bird flew. I started with Google Earth KML Layer and imported to ArcGIS Pro. This layer has data ...
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1answer
46 views

Why measure line in QGIS result in millimeter?

I am using QGIS 3.4.4 I just want to measure the distance between a tree with its shadow from a raster data, but when i use measure line the result is in millimeter. I just upgrade the software to ...
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1answer
266 views

Get correct measurements for fantasy world map

I read lots of questions about fantasy maps and custom crs but none of the answers could solve my problems. Here is what I have: A planet with an equatorial circumference of 38 211 km (radius: 6081....
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1answer
272 views

What is the practical limit for lat/long measurement accuracy?

There are several systems for finding lat/long coordinates. This includes GPS satellites, DoD TRANSIT, Russian GLONASS, Galileo, differential GPS, LORAN, land-based systems, and more. Maybe even using ...
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0answers
23 views

What surface's area is used to compute area of country? [closed]

Premise: Earth's surface geometry is modelled by means of different geoids -depending on the objectives. The roughest and most basic are ellipsoids surfaces. Yet, on a small scale, e.g., area of ...
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1answer
101 views

How could you measure the minimum and maximum distance to the outer edge of a polygon in QGIS

I am looking for a automatic method to measure the minimum and maximum distance from a point (represented by the star) to the outer edge of a polygon (black dotted line). I know this could be done ...
2
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1answer
486 views

Is it possible to change the measurement unit in QGIS 3.2 for the select features by radius tool?

Is it possible to set the default units for the select features by radius tool? I believe the default is set to meters but I can not seem to get it to use kilometers or miles for example. I know you ...
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1answer
22 views

Is there any difference in measurements when using the draw toolbar vs the editor toolbar?

Say I have a cornfield that I wish to measure acreage on. If I utilize the draw toolbar, create a polygon around the field, export to shapefile, add area field in attribute table, and calculate ...
2
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2answers
122 views

Measuring acreage from satellite image?

I am trying to use a ESRI basemap satellite image in order to obtain forest acreage values from a tax map parcel (image included). I have a parcel that contains farmland and forested areas, and I want ...
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0answers
129 views

Quick methods to make a shapefile/feature not m-aware?

Just wondering if anyone knows of a quick method to disable m-aware shapefiles/features? Searching Geonet, ArcDesktop help documents have proved unfruitful. I'm currently doing copy features and ...
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1answer
1k views

Creating Vector Buffers in QGIS 3

I am mapping the accessibility of job opportunities in Detroit for those who rely on public transportation. To do this, I need to create a circular buffer surrounding each bus stop with a radius ...
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0answers
30 views

Splitting a polyline at vertices and calculating start and end measurements for new features based on a known measurement of the original polyline

I have a route network which has a length-attribute defining length of each feature. This length-attribute comes from a data register outside of gis. Now I need to split each original feature at ...
2
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0answers
52 views

Calculate side of a polygon that touches another feature [duplicate]

How can I measure the length of the side of a polygon that touches another feature (calculate from A to B on the image below)? I'm creating and measuring lines to figure out the lenght of the '...
2
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1answer
702 views

Distance from one point to multiple points WITHIN a shapefile [duplicate]

I am looking to calculate the distance from a main point to multiple points WITHIN shapefile. In other words: I have a main point at the mouth of a creek. I have about 1,200 points at various ...
3
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1answer
163 views

Field sampling design: stratified random or transect?

I am trying to understand the impact of scientific activity in a remote polar environment. I have five locations in different parts of the region, where historic huts were placed for a couple of ...
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0answers
30 views

Measuring distance every 10 degrees

I have a point in the sea laguna and want to measure distance from the point to the closest shoreline within specified interval: every 10 degrees - new measurement. How can I do it automatically (...
2
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1answer
204 views

PostGIS Geometric V Geography measurements when using ST_Length

I was measuring geometry using some PostGIS functions and noticed that I was getting different results from the two methods I used. sum(st_length(st_transform(geom, 3857))) # Gave 3674 sum(st_length(...
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1answer
1k views

how to measure polygon perimeter / Distance in openlayers 3?

i am using openlayers 3 measurement tool for measuring line lengths and polygons areas, and this example worked for me: http://www.rhone-mediterranee.eaufrance.fr/milieux-aquatiques/poissons/js/...
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3answers
20k views

Measuring distance between points using QGIS?

I have a layer with about 500 single points. Now I want to measure the distance between each of these points and one specified observation point. I need the distance to show how far away from the ...
0
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1answer
149 views

Extract street right of way width from ROW polygon using street centerline

In the image below, I want to extract the width of each street's ROW, which would be twice the distance of each streets centerline to the nearest parcel boundary. Its slightly difficult to see, but ...
1
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1answer
623 views

How to calculate the mean distance between co-ordinates in QGIS

I have an assignment were I need to calculate the mean distance between coordinates. Effectively I am trying to find out what is the average distance in meters between buildings in a defined town ...
4
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1answer
106 views

Calculating change between two sets of district lines?

I'm using the Census Shape files for state legislative district lines for 2008 and 2012. I want to create a measure that indicates how much these lines have changed between these two time periods (...
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0answers
66 views

Running total of line length while drawing in ArcGIS for Desktop

Is there a way to display the running total length of a line while editing and drawing a new line in ArcGIS for desktop? I have a pdf with hand drawn lines representing hedgerows and the total ...
10
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1answer
3k views

Why is ellipsoidal distance greater than cartesian distance?

I created some linestring features in EPSG:32632 (WGS 84 / UTM zone 32N) exactly 10 000 m long. QGIS calculates all line lengths (horizontal, vertical, diagonal) as 10 001.9 m. The measure tool ...
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0answers
94 views

Identify the length and orientation of the features in P2 relative to features in P2? (ArcGIS)

I try to measure the maximal length and orientation of features in one shapefile (S1) relative to polygons in another shapefile 2 (S2). My goal is to evaluate the spreading of patches of beetle-...
3
votes
1answer
310 views

Deactivate Snapping for Measure Maptool (mActionMeasure) in QGIS temporarily

I use the QGIS measure-tool to measure distances. I often would like to deactivate the snapping temporarily while using the measure-tool. Is it possible to deactivate snapping (for example with a ...
2
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1answer
572 views

QGIS, What is the reason for wrong scale and wrong areas? [closed]

I am currently working with QGIS and loaded openstreetmap as a basemap (web-> OpenLayers plugin), it is in WGS84/ Pseudo Mercator. For some reason the scale is not correct. For example a distance in ...
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0answers
31 views

Is there a measurement standard e.g. for coast lines? [closed]

When watching discovery & documentary shows, coastlines are apparently defined to be just long enough to fit some explanation or a discussed topic. The coastline paradox is a well-established ...
2
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1answer
244 views

Is the line color and thickness of the ArcGIS measure tool able to be customized?

Is the line color and thickness of the ArcGIS measure tool able to be customized? My searches have come up empty. \ I'm working against a dark background and the black line (from the measuring tool) ...