Layer Structure
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GIS systems use a layer structure to organise the data. Likewise, Web mapping also arranges our base data, and then layers other contextual data over the top.
Base layers are normally made up of raster data, such as satellite imagery, digital elevation models (DEMS), hillshades or a combination of both raster and vector data.
You can toggle between base layers as you use the map. Examples of base layers available in Operations GIS are listed below:
Layer
Description
Hillshade and Bathymetry
Antarctic hillshade and bathymetry south of 60°S
LIMA mosaic
REMA DEM
The rest of the layers are called Reference Layers, and contain a mixture of Topographic and Operations data.
This data is split into Static Data, which is useful reference data that is relatively fixed, and Season Data, which is updated annually.
Examples of static operations data include station-specific data such as Rothera building layout, the Dash-7 PNR radii from airfields, or multi-year tractor traverse routes.
Season data is updated annually, and usually includes:
Waypoints, Depots and Network routes from the Air Operations Planning Maps
Science Sites sourced from the Field Operations Manager
Landsat Image Mosaic of Antarctica (LIMA). True colour (bands 3, 2, 1), pan-sharpened. Imagery dated 1999-2003. ()
Reference Elevation Model of Antarctica, a Digital Surface Model (DSM) at 8-meter spatial resolution from the Polar Geospatial Center ()
Topographic data layers are sourced from the .
The ADD is updated twice a year and is available for download . At Rothera, the data is updated at the start of each season.
