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How Geographic Information Systems Connect Data to Places
Read more: How Geographic Information Systems Connect Data to PlacesA plain-language look at what GIS is, how layers and data types work, and where geographic information systems show up in daily life.
Staff Picks
How Geographic Information Systems Connect Data to Places
Working with Slope, Aspect, Hillshade and Viewsheds
Comparing Web Mapping Libraries for Interactive Projects
Choosing a Map Type for Counts, Rates, Patterns and Movement
Satellite Imagery Explained: Sensors, Data and Practical Uses
Sentinel and Landsat: Which Imagery Fits Your Analysis?
Reading True-Color and False-Color Satellite Composites
Comparing Satellite Images to Measure Changes Over Time
Raster and Vector Data: Choosing the Right Spatial Model
Understanding Spatial, Spectral, Temporal and Radiometric Resolution
Radar and Optical Images: How Their Strengths Differ
How NDVI Measures Vegetation and Where It Can Mislead
QGIS and ArcGIS Compared for Learning and Mapping Workflows
How Map Design Distorts Data and How to Spot the Problems
Why Map Layers Do Not Line Up and How to Diagnose the Cause
Geospatial Terrain Visualization: Data, Methods and Interpretation
Build a Choropleth Map with Appropriate Rates and Class Breaks
Recognizing Landforms, Land Use and Features from Space
Heat Maps and Choropleths: Density and Regional Values Compared
Coordinate Reference Systems: Datums, Projections and Units
Elevation Models Compared: Bare Ground, Surfaces and Terrain
How to Align Scanned Maps with Real-World Coordinates
Designing Readable Maps with Clear Symbols, Labels and Color
Where to Find Free GIS Data and Check Its Quality
Where to Download Free Satellite Images for Analysis
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Working with Slope, Aspect, Hillshade and Viewsheds
A practical guide to terrain analysis in GIS: what slope, aspect, hillshade and viewshed tools do, how they relate, and a simple order to run them in.
Little pleasures
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Raster and Vector Data: Choosing the Right Spatial Model
Pixels or shapes? Learn how raster and vector data differ, where each works best, and how to pick the right spatial model for your map.
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QGIS and ArcGIS Compared for Learning and Mapping Workflows
A plain comparison of QGIS and ArcGIS Pro covering platforms, hardware, licensing, learning resources and which mapping workflow each one suits.