How to count the total length of roads in the region and draw data histogram

Transportation is of great significance to regional economic development , Many economic literatures have discussed this in depth , So how to be in ArcGIS The total length of internal traffic routes in the statistical area ？ Taking the total length of main highways in all provinces of China as an example, this paper introduces the relevant ArcGIS And the operation of statistical histogram .

        Tools ：

        Use ArcGIS in 【Identity】 Tool implementation . notes ：① For statistics of highway length , The statistical operation must be carried out in the projection coordinate system , Cannot be performed in a geographic coordinate system .② There are many ways to count the roads in various provinces , This article only provides one way to use

        The experimental steps ：

       1. Identify highway data

open ArcMap Software , Load the data of counties, districts and highways across the country . open 【Analysis Tools】|【overlay】|【Identify】, The input element is “ The main road .shp”, The identification element is “ Provincial administrative regions .shp”, Output elements are “marked_line.shp”, Other default . determine , Get the road data marked by the provincial division . notes ： The same road data is divided at the boundary . The operation interface and output results are as follows .

     

 2. Create fields

        open marker_line  Of Attribute Table, single click Table Option, choice Add Field Button . Field name “ length ”, The type is “float”, And click OK . The operation interface is as follows .

       3. Record the road length value

        Right click “ length ” Field , choice Calculate Geometry Tools , The attribute is “ length ”, Other parameters default . determine , Get the length attribute value of each highway record . The operation interface is as follows .

       4. Count the length of highways in each province

        Right click “PROVINCE_” Field , choice summarize Tools . Select... In summary statistics “ length ” Field “ The sum of the ” attribute . determine , Get the statistical result table data . The operation interface is as follows .

       5. Draw statistical histogram

        open 【Menu Bar】|【View】|【Graph】|【Create Graph】, Set up “Layer/Table” by “sum_output”,Value Field Field is “sum_ length ”,X Field and X Label Field Field is “PROVINCE_”,Color Set to “Palette”; next step , General graph properties Title Set to “ The length of highways in each province ”, The left title in the axis attribute is changed to “ length （ rice ）”, The next heading should read “ Province Code ”; Click on Finish. The operation interface is as follows .

       6. The final output result is shown in the figure below