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026] Global Mapper - Spatial Operations 02: Understanding Predicates

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Today, in our second session on Spatial Operations , we will explore Predicates , which offer a more granular approach than the basic operations we discussed previously. Admittedly, there are some limitations. Since these operations typically involve only two layers at a time, you might find yourself thinking deeply when dealing with multiple layers. However, most spatial operations can be successfully performed using these methods. 1. Getting Started First, let’s open the file we used in the last session. Global Mapper Control Center showing various vector layers including Area, Line, and Point In the Control Center, you can see our sample layers: Area01 , Area02 , Line01 , and Point01 . Now, let's launch the Spatial Operations tool and navigate to the Predicates tab. 2. Understanding Spatial Predicates UI Spatial Operations dialog with the Predicates tab selected The Predicates tab has a similar layout to the Operations tab we handled last time. However, it fo...
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025] Global Mapper - Spatial Operations 01: Geometric Operations

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Today, we will dive into Spatial Operations . These functions allow you to perform various geometric tasks such as merging shapes, subtracting one from another, finding intersection areas, or identifying elements contained within specific regions. We will practice using the following file: Attachment: Operation.zip  (This is a safe proprietary data file for Global Mapper.) Once you have downloaded the file, please open it in Global Mapper. Setting Up the Workspace Upon opening the file, you will see four layers in the Control Center: two Area layers, one Line layer, and one Point layer. The Spatial Operations tool can be found in the top menu bar under Vector Analysis -> Spatial Operations... Select "Spatial Operations..." to open the configuration window. As shown in the dialog, there are four primary types of spatial operations: Operations: Performs geometric calculations between layers. Predicates: Used for searching or filtering features. Tra...
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[023] Global Mapper - How to Close Gaps Between Adjacent Features in Vector Layers

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Today, we will explore the final item in the layer context menu that applies to all vector layers: "Close Gaps Between Adjacent Features..." Understanding the Purpose In digital mapping projects, especially when dealing with cadastral maps or engineering blueprints, you might encounter tiny, unintended gaps between lines or polygons. The "Close Gaps Between Adjacent Features" function is designed to eliminate these gaps by aligning the positions of vertices (vertex snapping). While this isn't a tool you'll use every single day, it is incredibly efficient for shortening the time spent manually zooming in and out to align boundary lines or design elements. Step-by-Step Guide 1. Prepare Your Layers First, open the project file we worked on in the previous lesson. In the Control Center , make sure to activate both the 'Line' (선) and 'Area' (면) layers. These will be our target layers for today's demonstration. 2. Access ...
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[022] Global Mapper - Point Layer: Split into Separate Layers Based on Attribute Value

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Today, we will explore one of the most frequently used functions in Global Mapper: the Split tool. This feature allows you to separate elements within a single layer into multiple distinct layers based on specific criteria. It is highly versatile and can be used with any vector layer or mixed vector layers containing various geometry types. First, let's open the file we worked on in the previous session. Looking at the Control Center, you can see various layers including points, lines, areas, and meshes. Executing the Split Function In this example, we will perform the split operation on the Point layer. Right-click on the target layer in the Control Center and navigate to the split option as shown below. Once selected, a window will appear asking you to choose the criteria for splitting. Selecting the Attribute to Split On The "Select Attribute to Split On" dialog provides several options to determine how your data will be organized into new sub-laye...
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[021] Global Mapper - Point Layer: Join Attribute Table/File to Layer

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  Today, we will explore a function that is essential for any GIS program: joining a CSV file to a vector layer (points, lines, or areas). Open your previous file and download the CSV file below. Attachment: table.zip   (This is a safe proprietary data file for Global Mapper.) The file above is quite simple, containing 'name' and 'value' columns. Since we have six points, I've created six records. Our goal is to compare the  Name  of the point features with the  name  field in the CSV file and add the corresponding  value  as an attribute to each point. Right-click the point layer and select  JOIN - Join Attribute Table/File to Layer . A window will appear asking you to select the layer to join. Select "Point" and click OK. The options window will then appear. Join Options Breakdown: File Name : Specify the CSV file you wish to join. Join File Delimiter : Select the delimiter used to separate data in your file. (In this case, it's a Comma). J...
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[020] Global Mapper - Point Layer: Calculate/Copy Attribute Value(s)...

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Today's menu is about the  Point Layer . The following four items are what differentiate point layers from elevation or raster layers, and they are commonly used in all vector-attribute layers: Calculate/Copy Attribute Value(s)... JOIN - Join Attribute Table/File to Layer Create Label Layer... SPLIT - Split Into Separate Layers Based on Attribute Value... Open the file from our last session and activate the point layer. Before we dive into the menu, let's assign a name to each point. Select the  Digitizer Tool (Alt+D) . Starting from the point at the top-left of the screen and moving clockwise, we will name them 1 through 6. Double-click a point to bring up the  Modify Feature Info  window. Enter "1" in the  Name  field and click OK. Repeat this for the other points, numbering them 2 to 6. The names we entered are now visible next to the points. (I will cover label display settings in more detail in a later post.) Today, we will try the  Calculate/Copy...
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