When the user accesses this functionality the Select Action panel is displayed in the main map. From this panel the user can work with the different tools.
• Show one layer: When the user clicks the "Show one layer" button
, another panel is displayed, from which the user can select the oceanographic parameter, the month and the year desired to show the information.
Once finish with the selection, the user clicks in the "OK" button and the corresponding raster is loaded in the map. The example below shows the SST raster layer for August 2008.
From the "Legend" button, located in the tool top bar of the application, the user can open the "Legend" panel in order to see the color scale and legend applied and the metadata of the raster layer.
• Compare two layers: Click on the "Compare two layers" button
, and the "Compare Parameters" panel will be displayed.
From this panel the user can select the information required to load two raster layers. The user can choose two layers with the same or different parameters and same or different dates. When clicking on the "Ok" button, two raster layers and one separator line are loaded in the map. The user can move this line showing or hiding a bigger area of one of these layers, allowing for comparison of the selected parameters in the region. In the next example, the SST raster layers for the months January and August of 2009 are displayed.
As in the previous case from the "Legend" button, locateds in the top toolbar of the application, the user can open the "Legend" panel in order to see the colour scale and the metadata for each layer.
WARNING: Clouds in the upper layer (in the attached figure the one in the left) allows the visualization of the colors in the lower layer (at the right side in the picture).
• Calculate Difference: Click on the "Calculate Difference" button
and the "Calculate Anomaly" panel is displayed.
The "Calculate Difference" tool, calculates the difference between the two selected rasters. Through the "Calculate Difference" panel, the user can select the oceanographic parameter (SST or Chl) and the two dates between which the user wants calculate the difference. When the user clicks on the button "Ok", the information is sent to a geoprocessing service managed in the server by Node.js. With this service, the difference is calculated and provides the result in a raster format for the CCLME region. In this case the difference between the SST raster layers was calculated for the months of January and August of 2009.
As in previous cases it is possible to access the legend through the Legend button located in the top toolbar of the application.
When clicking on any raster position, resulting from the geoprocessing, a popup is displayed with the different value for that pixel and the position's geographic coordinates (WGS84).