University of Arizona

DroughtView


How to Use DroughtView


Layouts    

Single Map     When DroughtView initially loads, the default Single Map view displays. You can display one product layer for one date using this layout.

Single Map View



Swipe View     You can access a swipe tool by clicking the Swipe View option. You can swipe back and forth between two product layers using the Swipe Tool. You can load different products into each panel by using the Layer Button located in that panel. You can also desynchronize the two panels by clicking the Synchronize Dates button in order to display different dates of products in the two panels. You can resynchronize the panels by clicking the Synchronize Dates button again.

Swipe View



Dual Panel     You can access a dual panel layout by clicking the Dual Panel option. You can load different products into each panel by using the Layer Button located in that panel. You can also desynchronize the two panels by clicking the Synchronize Dates button in order to display different dates of products in the two panels. You can resynchronize the panels by clicking the Synchronize Dates button again. Moving one panel will move the other panel to the same location. Unless you click the Synchronize Map Extents button, in which case you can adjust each panel independently. You can resynchronize the map extents by clicking the Synchronize Map Extents button again.

Dual Panel View



Navigation    

Zoom    You can zoom in and out of a panel by using that panel's Zoom Button. You can also zoom in and out on a panel using the scroll wheel on your mouse.

Zoom Button



Opacity     You can change the opacity of a product layer by using the Opacity Bar located in each panel. Pulling the marker on the Opacity Bar to the left increases the transparency of the product layer, while pushing it right increases the opacity of the product layer.

Opacity Bar



Date     You can select the date of a product by clicking the Date Tool in a panel. A calendar box will appear allowing you to change the month, year and click a day.

Date Box



Legend     The legend related to the product currently present in a panel appears at the bottom of that panel. The title of the legend tells you which product is currently loaded in that panel.

NDVI Legend

Difference Legend

Cloud Snow Legend



Scale Bar     The scale bars in the lower left hand corner of each panel will adjust based on the current zoom level.

Scale Bar



Layers     Click the Layer Button to access the various levels of the layer menu.

Layer Button



  BASEMAPS     Basemaps appear under all other layers. They will appear if you move the marker on the Opacity Bar all the way to the left. Click the bubble next to the basemap you would like to display in the panel.

Basemaps



  RASTER OVERLAYS     Products specifically designed for DroughtView are stored under the Raster Overlays heading. This includes vegetation greeness layers from MODIS and VIIRS, precipitation composite layers, Drought Monitor overlays and cloud/snow masks for MODIS and VIIRS. Click the bubble next to the raster overlay you would like to display in the panel.

Raster Overlays



  VECTOR DATA AND FIRE DATA TAB     Vector Data appears above all other layers. This list includes Roads and Borders, Watersheds, Grazing Allotments, Federal Lands, Tribal Boundaries, Fire Perimeters and other contextual files. Check the squares next to the layers to display the Vector Data in your panels. You can display multiple vector files at the same time.

Vector Data



Drawing Tools     These tools allow the user to draw a rectangle or a point. Then, these drawn features have a bubble with a button "Get Vegetation Timeseries Data", which opens a form for viewing timeseries' of NDVI and EVI from MODIS and VIIRS for the area within the drawn feature. Within the form, 'Available Timeseries' is a selectable list showing the available products to view timeseries data for, and 'Start Year' and 'End Year' limit the range of data to be displayed. If these fields are left blank, then all of the available data for each product will be retrieved (since 2002 for the MODIS data and 2012 for the VIIRS data). It may take a few seconds to query the data once the 'Get Timeseries!' button is pressed.

Drawing