The layers tab is used to load GIS resources into the map.
There are two types of layers supported
Feature Layers
Raster Layers
Feature Layers
Feature layers are vector data. They are not photographs or satellite imagery, but rather visual representations (drawings, such as polygons, polylines, etc.) of data. Representing a field of trees on a map using dots or small circles is vector data. Satellite or drone imagery of this same field of trees would not be vector data. Even mapping tasks and assets in the data tab could be thought of as vector data. Feature layers show up on the map looking like this:
Where each dot is some piece of data being visually represented (in this case) as a red dot.
Formats
Feature layers can be created in the map using three formats:
Shapefile (see Creating a Shapefile Feature Layer)
Web Feature Service (see Creating a WFS Feature Layer)
ArcGIS Feature Service (see Creating an ArcGIS Feature Layer)
Raster Layers
Raster layers are imagery or photographic data. Raster layers could be blueprints, building schematics, or third party satellite imagery. In the previous example of a field of trees, raster data of these trees could be satellite or drone imagery of the field. Anything which can be thought of as being "overlaid" on the map, as opposed to "drawn onto" the map, is probably raster data. Raster layers show up on the map looking like this:
Where the layout of this building can be clearly identified as an overlaid image on the map.
Formats
Raster layers can be uploaded to the map using five formats:
Georeferenced Image (see Creating Georeferenced Image Layers)
Tile Bundle
TMS
WMS
Drone Deploy
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