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Earth And Space Sciences › Remote Sensing And Gis

Web GIS

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web-gis web-mapping geospatial-web map-services

Core Idea

Web GIS extends geographic information systems to the web, enabling spatial data sharing, visualization, and analysis through browsers without requiring desktop GIS software. The architecture typically follows a client-server model: spatial data servers (GeoServer, ArcGIS Server, MapServer) host and process geospatial data, exposing it through standardized web services (WMS, WFS, WMTS, OGC API). Web clients (Leaflet, OpenLayers, Mapbox GL, ArcGIS JS API) render interactive maps in browsers. Cloud-native geospatial formats (Cloud-Optimized GeoTIFF, GeoParquet, PMTiles) enable direct access to large datasets without server-side processing. Web GIS has democratized access to geospatial information, enabling non-specialists to interact with spatial data.

Explainer

The evolution from desktop GIS to web GIS parallels the broader shift from installed software to web applications. Desktop GIS (ArcGIS Pro, QGIS) remains essential for complex analysis, data creation, and production cartography. But for data sharing, public engagement, field data collection, and collaborative workflows, web GIS has become the default delivery mechanism.

The server-side stack manages spatial data and processing. Spatial databases (PostGIS, SQL Server Spatial) store vector and raster data with spatial indexing for fast queries. Map servers (GeoServer, MapServer, ArcGIS Server) expose this data through OGC-standardized web services. Tile servers pre-render map tiles for fast base map delivery. Processing services expose geoprocessing tools (buffering, overlay, routing) as web APIs.

The client-side stack renders interactive maps in browsers. Libraries like Leaflet (lightweight, mobile-friendly), OpenLayers (full-featured, OGC-compliant), and Mapbox GL JS (vector tiles, 3D, WebGL-rendered) handle map display, user interaction, and data visualization. Modern web maps combine multiple tile and data layers, support client-side feature rendering and analysis, and integrate with web frameworks (React, Vue) for full application development.

The cloud-native geospatial movement is dissolving the server layer entirely. Cloud-Optimized GeoTIFF (COG) allows clients to request just the portion of a raster they need via HTTP range requests directly from cloud storage. GeoParquet provides efficient columnar storage for large vector datasets. PMTiles packages millions of map tiles into a single file accessible without a tile server. These formats enable serverless architectures where browsers access geospatial data directly from object storage, dramatically reducing infrastructure complexity and cost.

Practice Questions 3 questions

Prerequisite Chain

Counting to 10 → Counting to 20 → Understanding Zero → The Number Zero → Counting to Five → One-to-One Correspondence → Combining Small Groups Within 5 → Addition Within 10 → Addition Within 20 → Two-Digit Addition Without Regrouping → Two-Digit Addition with Regrouping → Addition Within 100 → Repeated Addition as Multiplication → Multiplication Facts Within 100 → Division as Equal Sharing → Division as Grouping (Measurement Division) → Division: Grouping (Repeated Subtraction) Model → Division: Fair Sharing Model → Division as Equal Sharing → Division as Grouping → Basic Division Facts → Division Facts Within 100 → Two-Digit by One-Digit Division → Division with Remainders → Remainders and Quotients in Division → Division Word Problems → Introduction to Long Division → Factors and Multiples → Prime and Composite Numbers → Equivalent Fractions → Relating Fractions and Decimals → Decimal Place Value → Reading and Writing Decimals → Comparing and Ordering Decimals → Adding and Subtracting Decimals → Multiplying Decimals → Dividing Decimals → Dividing Fractions → Mixed Number Arithmetic → Order of Operations → Integer Order of Operations → Variable Expressions → Combining Like Terms → One-Step Equations → Two-Step Equations → Solving Multi-Step Equations → Equations with Variables on Both Sides → Angle Pairs: Complementary, Supplementary, and Vertical → Parallel Lines and Transversals → Corresponding Angles → Alternate Interior Angles → Triangle Angle Sum Theorem → Exterior Angle Theorem → Triangle Inequality Theorem → Similar Triangles: AA Similarity → Similar Triangles: SSS and SAS Similarity → Proportions in Similar Triangles → Right Triangle Trigonometry Introduction → Trigonometric Ratios Review → Radian Measure → Converting Between Degrees and Radians → The Unit Circle → Graphing Sine and Cosine → Graphing Tangent and Reciprocal Trigonometric Functions → Derivatives of Trigonometric Functions → Antiderivatives → Iterated Integrals and Fubini's Theorem → Double Integrals in Cartesian Coordinates → Double Integrals over Rectangular Regions → Double Integrals in Polar Coordinates → Double Integrals: Definition and Setup → Iterated Integrals and Fubini's Theorem → Double Integrals over Rectangular Regions → Double Integrals over General Regions → Applications of Double Integrals: Area, Mass, and Moments → Triple Integrals in Cartesian Coordinates → Triple Integrals in Cylindrical and Spherical Coordinates → Change of Variables and the Jacobian Determinant → Applications of Triple Integrals: Volume and Mass → Vector Fields and Their Representations → Line Integrals of Vector Fields → Green's Theorem → Surface Integrals and Flux of Vector Fields → Surface Integrals and Flux of Vector Fields → Divergence Theorem: Flux and Outflow → Divergence Theorem → Electric Flux → Gauss's Law → Conductors in Electrostatic Equilibrium → Capacitance and Capacitors → Dielectrics → Dielectric Constant and Relative Permittivity → Electric Field Inside Dielectric Materials → Dielectric Materials and Polarization → Dielectric Susceptibility and Permittivity → Energy Density in Electric Fields → Electric Current and Current Density → Electrical Resistance and Resistivity → Ohm's Law and Circuit Elements → Electromotive Force (EMF) and Batteries → Kirchhoff's Circuit Laws: Voltage and Current → DC Circuit Network Analysis Methods → Transient Response in RC Circuits → RC Circuits → LC and RLC Circuits → AC Circuits: Fundamentals → Impedance and Reactance → AC Power and Resonance → Electromagnetic Waves → The Electromagnetic Spectrum → Electromagnetic Spectrum for Remote Sensing → Coordinate Systems and Map Projections → GIS Fundamentals → Spatial Data Models → Web GIS

Longest path: 115 steps · 647 total prerequisite topics

Prerequisites (2)

GIS Fundamentalshard Spatial Data Modelssoft

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