add Point Line Polygon -GIS Learning Series Using JavaScript
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https://www.udemy.com/course/masterin...
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learning Objectives:
By the end of this tutorial, you will learn:
1. What point, line, and polygon graphics are and how to add them to your map.
2. How to use geometries and symbols to create visual elements on a map.
3. How to add attributes and pop-ups to make graphics interactive.
4. Key concepts such as spatial references, and how they are applied when drawing shapes.
Graphics are visual elements used to display points, lines, polygons, and text in a map or scene. Graphics are composed of a geometry, symbol, and attributes, and can display a pop-up when clicked. You typically use graphics to display geographic data that is not connected to a database (i.e. a GPS location).
Key Terms Explained:
1. Point: A single location on the map defined by longitude and latitude.
2. Line (Polyline): A connected sequence of points that represent a path or boundary.
3. Polygon: A closed shape representing an area, such as a park or a region.
4. Graphic: Combines geometry and symbols to visually represent geographic data on the map.
5. Geometry: The shape or location data, such as a point, line, or polygon.
6. Symbol: Defines how the geometry looks, including its color, size, and style.
7. Attributes: Data associated with a graphic, such as names, descriptions, or IDs.
8. Pop-up: An interactive window that displays information when a user clicks on a graphic.
9. Spatial Reference: The coordinate system used to map geographic data. It's what ensures that all the points, lines, and polygons are drawn accurately on the map.
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