How to know or convert AREA, PERIMETER units in QGIS





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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 services provided by other websites and picked out the results.



Other site result :
Area = 17220976.88 m^2 PERIMETER = 17030.657 m



Area value is a difference of 10^10
Perimeter value is a difference of 10^5..



I use "EPSG:4166 - korean 1995" CRS and I also change project properties for units of distance, area. but, there are not any change.



So, I want to know what convex hull units are in QGIS and how to set other setting for ideal value.










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    1















    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 services provided by other websites and picked out the results.



    Other site result :
    Area = 17220976.88 m^2 PERIMETER = 17030.657 m



    Area value is a difference of 10^10
    Perimeter value is a difference of 10^5..



    I use "EPSG:4166 - korean 1995" CRS and I also change project properties for units of distance, area. but, there are not any change.



    So, I want to know what convex hull units are in QGIS and how to set other setting for ideal value.










    share|improve this question









    New contributor




    조광호 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.























      1












      1








      1








      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 services provided by other websites and picked out the results.



      Other site result :
      Area = 17220976.88 m^2 PERIMETER = 17030.657 m



      Area value is a difference of 10^10
      Perimeter value is a difference of 10^5..



      I use "EPSG:4166 - korean 1995" CRS and I also change project properties for units of distance, area. but, there are not any change.



      So, I want to know what convex hull units are in QGIS and how to set other setting for ideal value.










      share|improve this question









      New contributor




      조광호 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      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 services provided by other websites and picked out the results.



      Other site result :
      Area = 17220976.88 m^2 PERIMETER = 17030.657 m



      Area value is a difference of 10^10
      Perimeter value is a difference of 10^5..



      I use "EPSG:4166 - korean 1995" CRS and I also change project properties for units of distance, area. but, there are not any change.



      So, I want to know what convex hull units are in QGIS and how to set other setting for ideal value.







      qgis area units convex-hull






      share|improve this question









      New contributor




      조광호 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question









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      share|improve this question




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      edited 59 mins ago









      Vince

      14.8k32850




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      asked 2 hours ago









      조광호조광호

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          1 Answer
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          The unit of EPSG:4166 - korean 1995 CRS is decimal degree. You need to change the projection of your data to a CRS that uses meter unit. For example, you can use WGS 84 / UTM Zone ## projection with the correct zone number ## in which your data is located in.



          The workflow is like this:




          • Change the projection of your data to a WGS 84 / UTM Zone ## with correct Zone number

          • Use the output data from the first step to add new fields for area and perimeter, and calculate both area and perimeter.






          share|improve this answer
























          • I'd suggest EPSG:5179 (Korea 2000 / Unified CS)

            – Mike T
            1 hour ago














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          1 Answer
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          1 Answer
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          active

          oldest

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          2














          The unit of EPSG:4166 - korean 1995 CRS is decimal degree. You need to change the projection of your data to a CRS that uses meter unit. For example, you can use WGS 84 / UTM Zone ## projection with the correct zone number ## in which your data is located in.



          The workflow is like this:




          • Change the projection of your data to a WGS 84 / UTM Zone ## with correct Zone number

          • Use the output data from the first step to add new fields for area and perimeter, and calculate both area and perimeter.






          share|improve this answer
























          • I'd suggest EPSG:5179 (Korea 2000 / Unified CS)

            – Mike T
            1 hour ago


















          2














          The unit of EPSG:4166 - korean 1995 CRS is decimal degree. You need to change the projection of your data to a CRS that uses meter unit. For example, you can use WGS 84 / UTM Zone ## projection with the correct zone number ## in which your data is located in.



          The workflow is like this:




          • Change the projection of your data to a WGS 84 / UTM Zone ## with correct Zone number

          • Use the output data from the first step to add new fields for area and perimeter, and calculate both area and perimeter.






          share|improve this answer
























          • I'd suggest EPSG:5179 (Korea 2000 / Unified CS)

            – Mike T
            1 hour ago
















          2












          2








          2







          The unit of EPSG:4166 - korean 1995 CRS is decimal degree. You need to change the projection of your data to a CRS that uses meter unit. For example, you can use WGS 84 / UTM Zone ## projection with the correct zone number ## in which your data is located in.



          The workflow is like this:




          • Change the projection of your data to a WGS 84 / UTM Zone ## with correct Zone number

          • Use the output data from the first step to add new fields for area and perimeter, and calculate both area and perimeter.






          share|improve this answer













          The unit of EPSG:4166 - korean 1995 CRS is decimal degree. You need to change the projection of your data to a CRS that uses meter unit. For example, you can use WGS 84 / UTM Zone ## projection with the correct zone number ## in which your data is located in.



          The workflow is like this:




          • Change the projection of your data to a WGS 84 / UTM Zone ## with correct Zone number

          • Use the output data from the first step to add new fields for area and perimeter, and calculate both area and perimeter.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 1 hour ago









          ahmadhanbahmadhanb

          24k32155




          24k32155













          • I'd suggest EPSG:5179 (Korea 2000 / Unified CS)

            – Mike T
            1 hour ago





















          • I'd suggest EPSG:5179 (Korea 2000 / Unified CS)

            – Mike T
            1 hour ago



















          I'd suggest EPSG:5179 (Korea 2000 / Unified CS)

          – Mike T
          1 hour ago







          I'd suggest EPSG:5179 (Korea 2000 / Unified CS)

          – Mike T
          1 hour ago












          조광호 is a new contributor. Be nice, and check out our Code of Conduct.










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