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Questions tagged [units]

For questions regarding the increments used in measuring values.

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How to change shape area units in V-LATE

So I am working with land use shapefile. During the creation of polygons automatically created shape_area column with values that was not good for me so I created new column and with calculate ...
Eglė Piškinaitė's user avatar
1 vote
1 answer
67 views

Number formatting in Elevation Profile in Print Composer for QGIS

I have created the following Elevation Profile in QGIS based on a DEM featuring its distance in metres. As you can see, the distance axis displays the values in metres, which, for the sake of the ...
Trikelians's user avatar
1 vote
0 answers
132 views

What does unit mean in spatial reference system?

Each spatial reference system contains a definition of a unit. The rectangular coordinate systems mainly use meters, the spherical ones use degrees. You can see the unit of a srs for example here: ...
mz71's user avatar
  • 119
-3 votes
1 answer
31 views

COPERNICUS_S5P_OFFL_L3_NO2 image export convert unit to ppm

The image I exported from COPERNICUS_S5P_OFFL_L3_NO2 has values in mol/m^2 is there a way I could convert the unit to ppm? How do you Convert from Molarity (M/m2) to Parts Per Million (ppm) ?
Randa Al-Harbi's user avatar
0 votes
1 answer
54 views

Find out what type of unit is being used

I'd like to know what type of unit is being used in this example to set extents, for the user to only be able to move in France's map. example is here And the code is: const view = new View({ ...
manjiro sano's user avatar
0 votes
1 answer
109 views

Finding distance in ArcGIS Pro

I have two data sets, one is a set of points and the other is a set of lines. I am trying to run the 'near' tool to find the distance between each point and the closest line and have that distance be ...
WillieT's user avatar
0 votes
0 answers
241 views

How to change scale unit with ol.control.CanvasScaleLine(), in Openlayers

I have a scale control var scaleLineControl = new ol.control.ScaleLine({}); and I can change the scale unit. However, I would like to know if it is possible to change the unit with com var ...
Andreia's user avatar
2 votes
1 answer
411 views

Modifying the intervals and "offset from zero" parameter for an already-created contour line layer in QGIS

I'm trying to create a simple labeled contour line layer for a topographical map in QGIS. I've created a new layer for the contours using "Raster > Extraction > Contours" on a raster ...
Kyle's user avatar
  • 23
1 vote
0 answers
354 views

How To Set QGIS Map Units To Inches/Imperial?

I'm trying to recreate QGIS-equivalents of ArcMap/ArcGIS Pro maps originally created in inches/imperial units. I wish to retain the same units for the QGIS maps but have run into problems. I can't ...
VicTorn's user avatar
  • 31
2 votes
0 answers
251 views

Change vertical unit in a LAS/Z file with PDAL

I am using pdal translate to filter and transform some lidar files. One issue we have are the vertical units. Sometimes they are correctly specified, sometimes they are not, and sometimes they are ...
winwaed's user avatar
  • 1,314
1 vote
0 answers
1k views

Meaning of scale ratio in QGIS

I am new to using QGIS and I cannot find definitive information about how to intellectually use the scale ratio shown at the bottom toolbar. There is a number of predefined scales, with the format ...
Han's user avatar
  • 11
2 votes
1 answer
807 views

What unit is represented by OD Matix costs (in QNEAT3 within QGIS 3.6 Noosa)?

Some background to explain what I have done, and thus my current question (at the end). I am trying to find a way to get a list of the distances between sites of a certain class to the nearest site of ...
jsilverman's user avatar
1 vote
0 answers
270 views

Incorrect measurements when using "Create Grid" tool in QGIS

I am using the "Create Grid" tool in QGIS to simply create a 25x150ft grid. I am using EPSG:3857. When I select my parameter I want and run the tool, I double-checked the dimensions with the ...
Binx's user avatar
  • 1,360
7 votes
4 answers
8k views

What are the units in CRS EPSG:4326?

I have been searching for an answer to this question for a while now, and for some reason, I can't seem to find it. How are the units defined in the EPSG:4326 system? Are longitude and latitude ...
Anon1223's user avatar
0 votes
0 answers
115 views

Wrong scale units when reading raster grib2 in QGIS 3

I downloaded grid2 files to read meteorogical variables. I wanted to read them through QGIS 3.10.2 (windows and I have to stick with this version) but I encountered problems with the scale of the ...
Didi86's user avatar
  • 1
0 votes
0 answers
640 views

Converting Euclidean Distance into meters using ArcGIS Pro

I used Euclidean Distance tool on a vector layer (school, point) and in the output raster layer, the distances are in weird unit and the distance ranges from 0.01 to 0.32. How do I convert the ...
Joe Allen's user avatar
0 votes
1 answer
36 views

How to change "metres" from "degrees" without change of location? [duplicate]

I am working in QGIS (version 3.10). I know that in order to make certain distance analysis (in my case I want to do a heat map) a layer should have meters as units. Initially from the automatic SRC ...
JajajajaviM's user avatar
2 votes
1 answer
234 views

Changing degrees to metres [duplicate]

I got a shapefile which is in degrees format. For a vector analysis, I need it to be in meters to set a maximum distance. I can't do that with degrees. I know about on the fly CRS change; That's not ...
Jobonabas's user avatar
1 vote
1 answer
843 views

What are default units for coordinates in Create Fishnet tool of ArcGIS Pro?

This has been a reoccurring issue for me using ArcGIS Pro - when creating a fishnet and specifying the extent from an existing layer and subsequently trying to set the cell size, I am getting a ...
Kristina's user avatar
  • 1,073
1 vote
1 answer
268 views

How to print at an architectural scale?

I'm a landscape architecture student who is starting to learn QGIS. How would I be able to manually input a scale I want in inches to feet when exporting for print? For example, if I would like to ...
Shawn Park's user avatar
-1 votes
2 answers
300 views

Rasterio Python not reading "pixel" values correctly

I'm trying to simply get the NIR values from Sentinel2 in python. It should be as simple as #import required libraries import rasterio band8 = rasterio.open('R10m/B08_10m.jp2', driver='JP2OpenJPEG') #...
Alex's user avatar
  • 1
1 vote
1 answer
45 views

Forcing v.buffer distance units to be different from map proj units using GRASS GIS

I'm not very familiar with GRASS GIS. I am working on MODIS data, and set the region to match the projection of the data, which is given in degree units. I need to create a buffer with a 250m distance,...
F.H.'s user avatar
  • 85
0 votes
1 answer
111 views

Changing Linear Units on Scale Bar to a unit not listed [duplicate]

In ArcMap, how can I change my linear units on a scale bar for layout view to a unit not listed on the drop down menu in units of the scale bar? I want to get survey chains in my map as a scale bar.
Trev's user avatar
  • 1
0 votes
1 answer
46 views

How do I change the display unit without changing the coordinates numbers?

(X= 716 562,800911 Y= 3 568 493,622591 "Decimal Degrees") My problem is that the coordinates are correct but displayed with the wrong unit, it should be meters. When I try to use the ...
Rania Badaoui's user avatar
10 votes
4 answers
502 views

QgsLayoutItemScaleBar.setUnits does not work

I'm writing a plugin that allows to automatically export a map with a predefined layout, based on the content of the canvas. I need to have a scale bar in nautical miles, so in my code I add a ...
Plume's user avatar
  • 129
0 votes
1 answer
174 views

How do I know that ArcMap is running a tool using meters as the unit?

I am not sure how to tell what units ArcMap is defaulting for with the tools it is using. For example, I am currently trying to use the line density tool to create a road density layer. I need to use ...
fin's user avatar
  • 35
3 votes
0 answers
236 views

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 ...
ThoMiCroN's user avatar
0 votes
2 answers
307 views

Is AVHRR 5.3 SST data correct in Google Earth Engine [closed]

I am curious about how to scale the units of the AVHRR 5.3 Sea Surface Temperature data. The original units of this dataset is K, but it also has a scale factor of 0.001 (I'm not sure for what). The ...
Luis Lizcano's user avatar
4 votes
2 answers
1k views

Correlating mol/m^2 with ton and lb? [closed]

How do I compare tropospheric_NO2_column_number_density(mol/m^2) of Sentinel-5p with EPA statewide emission data which unit is Ton or lb? Goal: My goal is to compare remote sensing no2 emission ...
Niyamat Ullah's user avatar
0 votes
1 answer
633 views

Distance matrix expressed in meters

I'm aware that this is the hundredth (possibly more) time someone asked about the distance matrix that is expressed in degrees, but should be in meters. I read most of the questions, online guides, ...
Niicole16's user avatar
1 vote
1 answer
382 views

Raster projection units in QGIS

I imported a raster into QGIS but it is not displaying correctly. The workspace projection is WGS84, Zone 39N, with units of meters. The raster is in the same projection, except in U.S. feet. The ...
clearwater's user avatar
0 votes
0 answers
44 views

How creat a circle in meter unit, at GCS_WGS_1984 coordinate?

My shapefile coordinate sysytem is GCS_WGS_1984. I use the editor tool to draw a circle. EX:Right click to enter the radius in 100 meters. The unit seems to be degree. I want draw a circle which unit ...
劉耕宏's user avatar
3 votes
1 answer
635 views

Issues with units for Geometry by Expression in QGIS 3.10 - Super-sized buffers! [closed]

I am having issues performing a geometry by expression operation on a layer I have imported into QGIS. The issue is that the wedge buffers created by the expression I am using are far larger than they ...
silent_cortagrapher's user avatar
-1 votes
1 answer
57 views

What are the units for MapPoint M value with spatial reference WGS 84? [closed]

Is this something I can convert to miles or meters? What is the equation?
user151989's user avatar
5 votes
2 answers
3k views

What are the X Units for an elevation profile and how can I change them to meters?

The question: How do I get a simple elevation profile for a line using QGIS 3.4 with height/distance in either meters or feet? The problem: I have the same problem using both Profile Tool and qProf ...
Barbara Raitz's user avatar
1 vote
1 answer
3k views

Change units from degrees to meters in QGIS 3.6 [duplicate]

I'm cleaning up shapefiles (mainly for US areas) in QGIS 3.6 to import into other CAD environments such as Rhino. One problem encountered is that the units are in degrees, resulting in imports being ...
abigfatcat's user avatar
1 vote
0 answers
53 views

PostGIS ST_Point_Inside_Circle radius unit [duplicate]

I'm trying to use the ST_Point_Inside_Circle function from PostGIS but I'm not sure about the unit the radius is stored. Let's say I have a table with the following points: Id | Point 1 | ...
aibars's user avatar
  • 51
0 votes
1 answer
1k views

Canging coordinate system units from mm to m using ArcMap

I've received a feature dataset, that has a wrong amount of digits/wrong unit as coordinates. The coordinate system is actually a variation of Gauß-Krüger, which coordinates normally look like in this ...
lmft's user avatar
  • 49
2 votes
1 answer
2k views

Measuring area using correct CRS and units in QGIS

I have uploaded a shapefile and I am simply trying to calculate some simple areas of provinces (and I know their areas from Wikipedia). My map is from Zimbabwe, and I have saved the project, ...
Michael Hammond's user avatar
2 votes
1 answer
229 views

Knowing/converting AREA, PERIMETER units in QGIS?

I use Convexhull tool in QGIS and there are result value : AREA = 0.0017494390 PERIMETER = 0.1725495172 I thought the result was strange. So, I took a rough estimate of the points through the ...
조광호's user avatar
6 votes
1 answer
842 views

Difference between visual units in QGIS

In QGIS 3.10 (Latest LTR) there are several unit types, see image below What is the core difference between those units, in sense of their visualization behaviour on the Map? What I noticed by so far,...
Taras's user avatar
  • 33k
3 votes
2 answers
1k views

Which Units Geometry Generator in QGIS works with?

While modifying some geometries in QGIS in my previous question Adjusting flow map styles in QGIS: Varying buffers' sizes I ended up with a huge confusion regarding the dimensions/units that Geometry ...
Taras's user avatar
  • 33k
1 vote
1 answer
1k views

How to create unit and quantity "amount per area unit" in JSR-363?

I am trying to integrate units and quantity with JSR-363. I know and understand how to create SI and NONSI units and convert e.g. Areas units from one to another. But, in a kind of geographic ...
F.M.'s user avatar
  • 141
1 vote
1 answer
2k views

QGIS Identify feature Cartesian area in degrees

In QGIS 3, the identify feature tool automatically calculates area. However, there are two areas: Cartesian and ellipsoid. The first is being calculated in degrees (not wanted) and the second in ...
user127267's user avatar
1 vote
1 answer
1k views

LS Factor in SAGA (slope units)

In which units do I have to calculate Slope to use as an input for the LS Factor tool in SAGA (degrees, %, radians)? I couldn't find anything in the documentation.
Ale's user avatar
  • 41
2 votes
1 answer
666 views

Units of specific CRS projection?

I use a shapefile with CRS ("+proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0"). I want to calculate a buffer around the points with 'extract' from raster package. How can I know the ...
Alina's user avatar
  • 31
4 votes
1 answer
2k views

How does $area function calculate area in QGIS?

I have a 550 meter by 550 meter square polygon in a shapefile. The QGIS 2.18 project and the shapefile both reference EPGS:32648 WGS84/UTM48N. EPGS:32648 uses meters as the units. When I use $area to ...
GBG's user avatar
  • 9,880
2 votes
1 answer
328 views

LiDAR data in GPS time, only in second. Missing week?

I have LiDAR data LiDAR Data captured, unsure what units or format this time field is in? which I learned that my LiDAR data is in GPS second, however I do not have a column of data which shows the ...
whyzar's user avatar
  • 12.1k
3 votes
1 answer
700 views

LiDAR Data captured, unsure what units or format this time field is in?

I haven't been able to figure out or find out from searching around what units or format this time field is in my LiDAR data that was collected?
whyzar's user avatar
  • 12.1k
2 votes
1 answer
151 views

Change unit in Split tool on ArcGIS Pro?

I'm working on a project with a CRS in meters, map units and display units are also in meters, but Split tool (from Modify features) is in feet: Is there a way to change unit to split based in a ...
aldo_tapia's user avatar
  • 13.7k