Viewer User Guide

VanderSat Viewer

Access the Viewer by going to https://maps.vandersat.com in a supported browser (Google Chrome or Mozilla Firefox). Log in with your username and password.

VanderSat viewer login

Login screen

After you log in for the first time, a world map centered over the configured default region of interest with the latest date of your default product is shown. An example screen with the main controls is shown below:

VanderSat viewer

Main view with annotated controls

Once logged in, the following tasks can be performed:

Searching on the map

The panel on the top left of the screen can be used to search for a specific location on the map using the Google search engine. If found, the screen will be centered on that location.

Searching

Search the maps for known Points of Interest

Reset the view to area allowed

The home button on the top left controls resets the view on the map to your default region of interest.

Home view

Reseting the view to the area allowed

Add data layers

To add a layer (different product and/or dates), click on the + button located on top of the currently displayed layers. Please note that the currently selected layer is highlighted with a blue bar on its right border.

Adding a data layer

Adding a data layer to the map

Change the appearance of a data layer

In the layer information box you can manipulate the layer in a number of ways:

  • Change the opacity of the layer with the opacity slider

  • Make the layer visible or invisible with the “eye” toggle

  • Connect a layer to another layer with the “shackle” toggle. This allows you to change the displayed time for all connected layers at once.

  • Delete a layer with the “trash can” button

  • Change the data legend to the desired range by sliding the legend endpoints

Layer information box

Layer information box

Moving around in time

To load a different date for the selected product, you can either use the time slider on the bottom and click on the desired date (please note that you can zoom in and out of the time slider to change the displayed range by using the wheel of your mouse) or manually specify the date in the calendar on the right of the slider.

Time bar

Time bar and date selection

Comparing data in split screen or spy mode

Use split screen mode to compare multiple product layers. For example, you can compare different times of one product or different products for the same time. To enter split screen mode, drag one of the layers to the right part of the screen.

Split screen in the Viewer

Split screen mode

While in split screen mode, enter “spy” mode by clicking on the button above the right layer. In this mode, the layer on the right side is only shown within a size-adjustable square that you can drag around with the mouse.

Spy mode in the Viewer

Spy mode

Creating single point time-series graphs on the fly

Click on a valid data point on the map to get the exact longitude, latitude, and product value. It is then possible to create a time series for this point. After selecting to draw the time series, the drawing starts between the selected start and end date, and percentage of completion as well as the estimated time remaining is displayed.

Time series

Time series graph for a single pixel

After the time series is completely drawn, a line of the moving average is added. Click on the Year button to plot individual years on top of each other.

Time series

Time series graph of a single pixel with the graph switched to year mode

Displaying a time-series for a region of interest

If you click on a point within a region of interest (ROI), you can also choose to view an ROI Information a time series of the average value of the ROI. ROI timeseries are not generated on-the-fly but updated once a day in the background.

Region of interest

Clicking on a point in a region of interest

Displaying Key performance indicators

After selecting to show the dashboard, KPIs are shown for the selected date. Moreover, the time series corresponding to the ROI is also drawn.

The time series for the ROI is drawn as well as the centered moving average +/- 20 days for this ROI (smoothed signal) available until the last 20 days, and the climatology built from the same +/-20 days smoothed signal.

The following KPI’s are currently shown for the selected date:

Data quality (%)

Represents the percentage of data usable for the ROI

Observation Volumetric (m3/m3)

Represents the current daily observation

Relative to Climatology (m3/m3)

Represents the difference between the selected date value and the climatology value at the same day of the year

Relative Change (m3/m3)

Represents the variation compared to the last observation.

Key performance indicator

Figure showing the key performance indicators in a region of interest

Manage API requests

Specific time series request can be made clicking on the New request button in the time series window. A popup to set the parameters of the request will show up. Afterwards you can check the status of the request and retrieve the information through the API Access menu on the right, shown when clicking the API access button.

API requests

“New request” button location

API requests

API request creation and checking it on the API access sidenav afterwards

A list with all the API requests can also be found on the API access menu, after clicking the API request management button. The list can be filtered. The current status of the processing for the request can be seen and refreshed from the list. If there’s a file related with a request you can download it.

API requests

Accessing the API requests list

Managing regions of interest

The region of interest (ROI) menu can be found on the top right of the screen, just below the settings menu (where you can change the base layer from satellite to terrain, openstreetmap, etc.).

Region of interest

Figure showing the main components of the VanderSat viewer including the ROI menu at the top right

All defined ROIs are displayed in this menu. You have the option to show a specific one, or hide/show all of them. To create a new ROI, you can either draw one manually or upload a shapefile (GeoJSON format or zip archive containing the required files).

Region of interest

Figures showing the VanderSat ROI menu. Regions can be switched on or off, new regions can be defined (uploaded or drawn) and edited.

Using the controls on the left a new region can be created on the by drawing it on the map.

Region of interest

Figures showing the VanderSat viewer ROI drawing

Once uploaded, the new ROI can be customised with a name and a description. Please note that for multipolygon shapefiles (ie multiple shapes in a file), you have the option to select a subset of them and/or to consider them as different ROI or a single one as the union of those multiple shapes.

Region of interest

Figure showing the edit/upload menu for ROI’s in the VanderSat viewer

Once a new ROI is created, the map is centered over this ROI and the current selected layer is shown.

Region of interest

Figure showing the creation of a new region

Note

Please note that when a new ROI is for the first time added (drawn or uploaded), it takes a few hours to initialize the complete historical dataset corresponding to this ROI and update the dashboard time series and KPI values.

Using labels to tag and filter ROIs

The regions of interest can be tagged using labels which you can create and customize. Those labels can then be used with the ROI search for filtering purposes.

Region of interest with labels

Figure showing the rois list with labels on them

Region of interest with labels

Adding labels to a ROI

The “Label management” button below the ROIs list opens a dialog which allows to create, edit and delete the labels.

Region of interest with labels

Figure showing the roi labels management

Whenever you have a filter applied, the ROI list is reduced to the matching results. Those resultant ROIs can be shown/hidden in the map by clicking the “Show/Hide filtered ROIs” button below the list.

This action won’t affect to visibility of the ROIs not present in the filtered ROI list.

Region of interest with labels

Figure showing the filtered rois list

Changing background

Show-Hide of the filtered ROI list

Change the background layer

You can change the background map from the default satellite view to another layer using the “base layer” option from the settings menu.

Changing background

Changing the background map in the viewer

Change the grid

You can add a grid to the map using the grid option from the user settings menu.

Changing the grid

Changing the grid in the viewer

Download data

You can download part of the current data layer as a GeoTIFF to your local computer. To do so go to the API access meu and choose the “Download map” button under the Exports heading. A rectangle will appear that can be changed in size to select an area. Press save once the required area is selected.

Downloading data

Downloading a data layer as a GeoTIFF in the viewer

This will create an API request that, when the is Ready you can download the resulting GeoTIFF for that request accessing it from the API access menu in the “Recent API requests” list, or in the list shown after clicking the “API Request management” button.

Downloading data

Downloading a data layer as a GeoTIFF in the viewer

Share a view via a url

Using the share button you can generate a URL that can be used by others (or yourself later on) to see the exact same view. You will need a login to the viewer in order to use the URL and permissions to view the selected propducts. Checking the Latest date option in the dialog show a map with the latest info available whenever the share link is used.

share url

Share the current view with others as a URL

Measure distances on the map

Clicking the arrow control on the left enables the measurement tool controls.

  • Adding points: single click. (to measure the distance between them. The total distance accumulated is shown in the last point).

  • Stop measuring: double click, escape key, or click again the arrow control on the left.

  • Clear current measurements shown: click the [x] right under the arrow control on the left.

  • Change measure unit: click the third control with a letter under the arrow control on the left. Units available: meters (m), miles (mi), nautical miles (nm).

A point can be moved once its placed via drag and drop or “picking it up” with a single click, then place it again with a another single click. A point can be removed via clicking on it while pressing the shift key. A measurement can be continued via clicking on the last point while pressing the ctrl key.

Once the measurement tool is disabled, the data will be kept on the map. But enabling it again will clear them.

Note

The measurement tool will always take the shortest line from one point to the next.

measurement tool

Measurement tool