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Creating Polygons in Arcgis | Basic Functions and Applications | Map Digitization

Notes for part 4, this is just a summary, what the arcgis tutor said, who is he?, it’s in the arcgis notes part 1. I tried to fully write what the tutor’s brother said, it’s more like making a personal learning module, but there’s nothing wrong with someone else want to stop by and read.

What will be discussed?

Regarding basic functions, functions that are often used when operating Arcgis, especially when digitizing maps in terms of creating polygons. So basically the topic discussed is polygons.

  • Polygon Functions in Arcgis
  • Plygon Toolbar
  • Applying the Polygon fungsi function
  • Creating correct Polygons
  • Merge Polygons
  • Applying color to the Polygon area

Disclaimer yes: The points above are the results of the arcgis tutor’s delivery, so here I will only summarize. To make it easy to understand, I use the most common language, short, clear and concise, that’s all.

What are Polygons?

Polygon consists of two words Poly which means many and gone which means point, if these points are connected it produces a 2-dimensional shape, in arcgis we call it an area. So a polygon is a set of points that form a closed curve area.

Polygon Functions in Arcgis

In general, its function is to digitize the boundaries of the area on the map, making it easier for us to know which area is in which area.

Data source

When digitizing polygons on a map, it is necessary to have reference reference data, it can be from the results of pinpointing gps coordinates in the field, or data that is already available.

Polygon Toolbar

What is meant here is the Toolbar which is commonly used when digitizing using Polygons.

This image will be a reference for the points that will be written below

The part indicated by the arrow is a function that is often used when dealing with the polygon digitization process. The details won’t be written here, it’s better to just chat on your own in front of each other’s PC screens, because if you explain it will make you dizzy.

Just make an idea, in the toolbar there is a manual function, automatic. If you do it manually, do it as usual, while automatically there are certain shapes available including circles.

Applying the Polygon Function

The basic stages in notes sections 2 and 3, the stages are: Open Arcatalog > Select Folder > Right click on the folder > New > shapefile > in the shapefile dialog box set the name and Feature type polygon.

For naming polygon data it is always associated with a certain area or area, for example settlements, vacant land, green areas and so on.

Creating Correct Polygons

When applying this function, do not let there be parts that are not covered or there are gaps in the area. So that the data is not overwritten with one another, select the polygon shapefile data in the table of content section, select Editor > start editing on the toolbar, then click a similar file in the create feature, now it’s time to start digitizing.

Before placing the polygon points, zoom in on the map, so that the accuracy of the polygon points is getting better and neater.

Merge

Applying Color to Polygon Area

All areas have been given a polygon, before applying color to the polygon area, you must first create an Attribute name for each area. After creating attributes, continue to apply colors, how

  • Right click on “settlement12” in table of content
  • select properties, it will appear as shown below
Applying color to the polygon area
  • Next select symbology > categories, the dialog box will appear as above
  • for the settings, “Value Field” change to the attribute name, above I gave the name “Settlement Name”
  • select “Add All Value”, the color settings for each polygon will appear
  • Set the color as you wish, choose ok
  • Done

Closing

The attribute process will be made its own note, this is related to the naming of each area, the area of ​​​​the area and others.

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