Chapter 5: ArcGIS Online is used for creating layers and web apps for the public, but ArcGIS Enterprise is used for building a private Web GIS. ArcGIS Enterprise is used in situations where there is a need for on-site Web GIS (no internet or government regulations), hybrid Web GIS (keep their own infrastructure), and functions only available with ArcGIS Enterprise due to security. Both ArcGIS Online and ArcGIS Enterprise can create multiple web layer types. A raster tile layer is commonly called a tile layer and delivers maps as image files. They are commonly used as basemaps. Vector tile layers deliver maps as grouped vector files in PBF. Vector data is usually smaller than raster data and can be generated much quicker. Map image layers can be drawn using tiles and are used much less today. They can be used for color-shaded relief and large datasets. Feature services can create feature tiles on demand. Map image layer requests are not reusable and run slowly. Raster and vector tile service requests are precached on the web server and are faster than map image layers. Feature layers are used for editing workflows and changing data. If the data is only used for visualization, use raster or vector tile layers. To use ArcGIS Pro to create web layers, you have to prepare your data using ArcGIS Pro, remove unused layers and complex symbols, and then share the web layer and verify it in your ArcGIS Online or Enterprise portal to confirm it is working correctly. When sharing to ArcGIS Enterprise, you can choose to reference registered data or copy all data.
Chapter 6: Spatiotemporal data moves or changes over time. It is categorized into four groups: moving, discrete, stationary, and change. Discrete data is something that “just happens,” such as crimes and earthquakes. The time value is stored in a single attribute field if it happens in a moment, and stored in two attribute fields if it has a start and end time. IoT is the network of devices embedded with sensors that allow them to collect and exchange data. These devices can be things like airplanes, lights, and security cameras. Enterprise IoT applications include smart cities and environmental quality monitoring. Consumer IoT applications include connected cars and smart homes. Geolocation provides context for the IoT ecosystem to understand values. ArcGIS Velocity and ArcGIS GeoEvent perform continuous data processing and analysis, and send alerts when specific conditions occur. ArcGIS Velocity introduces feed items, real-time analytic items, and big data analytic items. The poll method is where a client periodically polls the server to retrieve new data. The push method pushes data to a web client, which is good for analyzing real-time data. Mission is a real-time situational awareness product that helps coordination among a team. It is good for emergencies and military operations. Mission Manager is the web app where missions are created, and Mission Responder is a mobile app that allows location tracking and geomessaging.
Application: You can create a map comparing air quality and temperature, and then create an app that shows how air quality changes over the course of a year.