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Showing posts with the label Attribute Calculation

[052] How to Use Formula Calculation in Global Mapper Attribute Setup

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Automating attribute transformation using mathematical and string functions to prepare data for 3D modeling. This tutorial explains how to use the "Use Formula Calculation" feature within Global Mapper's Attribute Calculation Setup. We focus on a real-world scenario where elevation data is trapped inside a text string (e.g., "FH:118") and must be extracted and converted into a numeric attribute for accurate 3D simulations. Why Attribute Transformation Matters in 3D Simulation For 3D simulations, you need to create 3D data by applying a planned elevation to each parcel. However, in actual CAD drawings you receive, the parcels and the planned elevations are often placed on separate layers. Of course, if there are only one or two, you could manually enter the elevation value for each parcel, but if there are hundreds of parcels, the story changes. Take a look at the data below. img 1 : Global...

020] How to Use Point Layer Attributes in Global Mapper | Calculate & Formula Methods

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Automate Point Layer data management by performing arithmetic operations and complex formula-based attribute calculations. This tutorial explores the "Calculate/Copy Attribute Value(s)..." feature in Global Mapper. You will learn to add new attributes, duplicate existing data, and leverage the formula engine to streamline data preparation for 3D GIS and urban simulations. How to Use Calculate/Copy Attribute Value(s) The following four items are what differentiate point layers from elevation or raster layers, and they are commonly used in all vector-attribute layers: img 1 : Point Layer's Context Menus 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. img 2 : Control Center window showing the Poi...

007] How to Perform Accurate Viewshed Analysis with 3D Building Obstructions in Global Mapper

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Learn how to incorporate 3D building data into visibility calculations for realistic urban line-of-sight mapping. This tutorial covers the essential workflow for preparing vector building data, calculating floor-based heights using attribute math, and configuring the Viewshed tool to recognize buildings as physical obstructions on top of a terrain model. Introduction to 3D Building Viewshed Analysis 🎥 Video Tutorial: Viewshed Analysis with 3D Buildings For a clearer understanding, check out the video tutorial below. It walks you through the entire process—from calculating building heights using attribute data to generating an accurate Line of Sight (Viewshed) map with urban obstructions. Follow along with the video to master this advanced technique! Video walkthrough of Viewshed Analysis with 3D Building Obstructions To follow along, please open the Workspace we worked on in the previous ...