Questions tagged [units]

For questions regarding the increments used in measuring values.

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24 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') #...
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1answer
22 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,...
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1answer
35 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.
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1answer
21 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 ...
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0answers
27 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 ...
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1answer
39 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 ...
3
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0answers
49 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 ...
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2answers
82 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 ...
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2answers
364 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 ...
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0answers
38 views

Shortest path cost units

I am using the network analysis tool to compute the shortest path between points considering a layer with roads. The problem is that I am not sure about the units of the shortest path cost. For ...
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1answer
51 views

Distance matrix expressed in meters

I'm aware that this is the hundreth(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, etc.,...
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1answer
95 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 ...
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0answers
21 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 ...
3
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1answer
280 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 ...
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1answer
36 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?
3
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1answer
486 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 ...
1
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1answer
989 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 ...
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0answers
43 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 | ...
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1answer
886 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 ...
2
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1answer
436 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, ...
2
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1answer
112 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 ...
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1answer
414 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,...
3
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2answers
347 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 ...
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1answer
453 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 ...
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1answer
554 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 ...
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1answer
477 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.
2
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1answer
264 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 ...
2
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1answer
156 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 ...
3
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1answer
115 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?
2
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1answer
64 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 ...
3
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1answer
692 views

Units for Area on QGIS - need to convert to square meters

I have a shapefile with building footprint outlines. I am trying to identify buildings that are a certain size in meters squared. The shapefile that I has, has a SHAPE_Area column, but I cannot tell ...
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2answers
365 views

Where can I lookup the units associated with an EPSG code?

I'm trying to find a source of information with the default units (meters, ft, ftUS) associated with an EPSG code. I'm currently using spatialreference.org and fetching URLs like this: http://...
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1answer
128 views

Converting proximity from PIXEL distance to GEOmetric distance in QGIS

I used the Raster>Analysis>"Proximity (Raster distance)" tool in QGIS in order to create a raster of distances to a particular value in another raster. This is the same sort of thing someone might do ...
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0answers
237 views

Changing Units of a prj file in ArcGIS

I have a multipatch feature class which comes from a conversion of a IFC model. Its coordinate system is very strange ("IFC_COORD_SYS_0") and I'd like to change it to EPSG:32632. I am using ArcGIS ...
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1answer
319 views

Displaying Distance in Miles for Elevation Profile using Profile Tool in QGIS

I am attempting to generate an elevation profile in QGIS 3.2.2, with elevation in feet, and distance in miles, using Profile Tool. I have managed to convert my DEM files to feet, and the elevation of ...
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1answer
3k views

Setting cell size on “Polygon to Raster” tool, in ArcGIS?

How do I properly set the cell size that I want when converting polygons to raster files? Also on the raster file Layer Properties what exactly does the Cell Size indicate, as it doesn't seem to ...
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2answers
54 views

QGIS Shapefile - Units/Editing Shapefile

I have a Shapefile that has properties/parcels as polygons. I am looking to select by parcels that are bigger than a certain size in acres. The problem is that the Shapefile has the properties/parcel ...
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2answers
44 views

How do I check my map units (needed for Point Density Tool)?

The Point Density Tool in ArcMap asks me to specify cell size in map units, but I am confused as to how to find out exactly what my map units are (e.g. whether they are based on the data frame ...
2
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1answer
572 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
163 views

Changing unit of measure of Draw tool in ArcMap?

How do I change the unit of measure when using the drawing tool in ArcMap 10.5.1, like indicated in image?
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2answers
176 views

Measuring a Buffer

If I create buffers around coordinate points using a linear unit of measurement, is the distance I input the radius around the point or diameter? For example, if I input 800 meters, will it form a ...
3
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2answers
606 views

Arcpy UpdateCursor 'SHAPE@X', 'SHAPE@Y' in decimal degrees

I have the code below that works, however I want the units to be in decimal degrees. How do I force this? fields2 = ['cent_lat', 'cent_long', 'SHAPE@X', 'SHAPE@Y'] with arcpy.da.UpdateCursor(fc,...
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1answer
506 views

Change multiple polygons' area from square degrees to square meter in attribute table with QGIS

I imported an ESRI personal geodatabase vector file (.mdb file) into QGIS, when I open the attribute table, it seems the the shape_area unit is in square degree. I changed the project properties to a ...
3
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1answer
557 views

Advanced Digitizing Panel angle units

I have QGIS 2.18.3 installed. I'm trying to change angle units from degrees to Gon/gradians (90 degrees = 100 Gon). I navigated to Settings--> Options --> Map Tools --> Preferred angle units, and ...
2
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1answer
51 views

Increase maximum line style width

I'm drawing lines in QGIS and need to specify the width as map units because I want the width to be the same, regardless of scale. The projection I'm using is standard in my field so I don't want to ...
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0answers
390 views

Why is DWITHIN filtering my data with native EPSG 4326 with meters instead of degrees?

Ok so I have a PostgreSQL Table, to which I added a PostGIS geometry column using: SELECT AddGeometryColumn ('public','my_table','geom',4326,'POINT',2); Followed by: UPDATE public.my_table SET geom ...
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0answers
362 views

ArcGIS Pro map units locked as Degrees - how to change to Meters

Instructions here don't seem to add up. I'm not able to change the map units to Meters. Is there another way?
1
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1answer
389 views

In QGIS, my contour layer is always in meters despite settings, and DEM [closed]

I have a DEM file in Raster Layer that has elevations in meters, I have used the Raster Calculator to convert them to feet, and saved as a new DEM layer. The legend shows feet. When I run an ...
0
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1answer
1k views

Calculate distance matrix in km units

I would like to create a distance matrix and have as output the distances expressed as kilometers (km). Here my current output, which I believe is in degrees and NOT in km: My coordinate system (CRS)...
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2answers
1k views

Kernel Density Tool - Can't change Area Unit?

When I pull up the Kernel Density tool in ArcMap Desktop 10.5.1 I can choose different options for the Area Unit. As soon as I choose a point input feature class, this feature becomes grayed out and ...