Multimodal Accessibility Modeling with GTFS Data in GIS 1. Multimodal Accessibility Modeling GTFS GIS: Understanding GTFS Data Conventional road network analysis answers questions such as how quickly a driver can travel between two locations, which roads provide the shortest route, or what area lies within a 15-minute drive. However, these methods do not adequately represent … Read more
Flood Risk Mapping with Synthetic Rating Curves and DEMs: A Practical GIS Tutorial Introduction Flood risk mapping combines terrain analysis, river hydraulics, and hydrological frequency estimates to identify areas that may become inundated during high-flow events. A Digital Elevation Model (DEM) provides the terrain surface, while a river stage–discharge relationship, commonly called a rating curve, … Read more
Designing Accessible Maps for Color Vision Deficiencies (Colorblind-Safe Cartography) Introduction: Why accessible cartography matters Color is one of the most powerful visual variables in cartography. It helps readers distinguish geographic features, interpret quantitative patterns, identify boundaries, and recognize spatial relationships. However, a map that works well for a cartographer with typical color vision may be … Read more
How to Ace a Technical GIS Interview: Common Questions, Portfolios, and Coding Tests Introduction: What Hiring Managers Look for in Modern GIS Interviews Learning how to ace technical GIS interview questions coding test scenarios requires mastering more than just software—it demands a reliable problem-solving framework. A technical GIS interview is rarely just a test of … Read more
Migrating from ArcMap to QGIS: A Seamless Transition Guide Introduction: Why migrate from ArcMap to QGIS? Migrating ArcMap to QGIS is a practical step for GIS professionals, university students, researchers, and organizations that want a modern, sustainable, and cost-effective desktop GIS workflow. ArcMap, part of the legacy ArcGIS Desktop platform, has long been used for … Read more
Building Real-Time Spatial Dashboards in QGIS with GeoNode and PostGIS Introduction: Why Static Maps Fall Short for Time-Sensitive Decisions A static map captures the state of a geographic area at a particular moment. That works well for printed reports, planning documents, and historical analysis, but it becomes less useful when the underlying situation changes every … Read more
Cross-Validation in Spatial Interpolation: How to Test Accuracy (IDW vs Kriging) 1. Introduction: Why Spatial Interpolation Needs Validation Spatial interpolation transforms discrete sample measurements into continuous geographic surfaces. Environmental scientists use it to estimate groundwater levels, GIS analysts map air pollution, and agricultural researchers predict soil properties between sampling locations. However, a visually smooth raster … Read more
Fuzzy Logic in GIS Site Suitability: Moving Beyond Binary Constraints Introduction Traditional GIS site suitability analysis often relies on Boolean logic, where every location is classified as either suitable (1) or unsuitable (0). This approach is straightforward and easy to implement, but it can oversimplify geographic reality. Consider a hospital site-selection rule requiring a location … Read more
Automating Map Export Loops with ArcPy and PyQGIS GIS Coding Tutorial · Python Automation · ArcGIS Pro · QGIS Introduction Imagine you have 50 administrative districts, and each district requires its own map showing boundaries, roads, settlements, a north arrow, a scale bar, a legend, and a descriptive title. When dealing with dozens of administrative … Read more
How to Publish Free Interactive Maps with qgis2web and GitHub Pages How to Publish Free Interactive Maps with qgis2web and GitHub Pages makes turning a static geographic information system (GIS) project into a live, shareable web application effortless without writing custom JavaScript from scratch. Today, GIS professionals, urban planners, and students can bridge desktop GIS and … Read more