Comment on page
Most frequent question asked by Terria platforms' users.
It is best to use a browser with WebGL support such as the latest versions of Google Chrome, Mozilla Firefox and Microsoft Edge. The maps do not work well with older browsers (for example IE9, IE10, IE11); the map rendering will be limited. It may not support 3D rendering of maps, so the 3D Terrain option may show the same result as 3D Smooth.
Locations/addresses are part of the base maps provided by Bing Maps, Geoscience Australia, NASA and OpenStreet Maps. Unless is using a custom base map provided by the platform owner, the Terria maps are dependent on those providers updates. For example, Bing Maps updated the Australian maps in February 2017: https://blogs.bing.com/maps/February-2017/New-Imagery-Released-Covering-Australia-and-India. For correcting those location errors, you have to address them directly to the base maps providers.
There are three types of spatial data usually available:
Point Click on any point to see more information about that particular point feature.
Line Click on any line to see more information about that particular line feature.
Region/Polygon Click within any region to see more information about that region.
In most cases the spatial data being displayed is coming straight from the various data custodians included in the platform. For some datasets which are not available in a format possible to display on the map, these have been transformed and are hosted by developers of the platforms with the data custodians’ permission. You can see details of the department or agency that provides the spatial data by clicking "About data" in the Data Workbench.
Some older computers do not have graphics cards which fully support WebGL and some older browsers do not make use of this support even if it is present. The Terria platforms require this support in order to show 3D Terrain Perspective View.
Try upgrading your browser to the latest version. If that still does not work, you may need to consider working on a computer that has more recent graphics support.
Terria platforms automatically change the content of the map according to the scale at which you're viewing. If you zoom in, it shows more detail. At some points in the zoom range, the map display switches from high altitude photography to lower altitude photography. These sets of the photography are not colour matched to each other, so may have quite different hues. The actual photography scales used, the date of that photography and its lighting conditions will vary across Australia. When you are using Perspective View (available using the Gyroscope) the part of the terrain nearest to the "camera position" is naturally shown at a larger scale than the more distant parts. Depending on your zoom level, this can result in the foreground being displayed with a different set of photography from the distant parts of your Perspective View.
Although Terria platforms do not have a dedicated "Save my view" feature yet, you can:
- 1.Select the datasets that you would like to save. Adjust the zoom to the desired view.
- 2.Create a share URL by clicking the "Share / Print" button at the top right.
- 3.Copy the generated share URL and email the URL to yourself, or save it in Favourites.
You can use the Feedback button or contact directly the platform owners; their contact details are usually in the About pages.
The spatial data usually displayed on Terria platforms are referenced directly from the supplying organisation. If that supplying department or agency updates or removes any data, that change will be reflected immediately by maps.
If you have any questions about the spatial data, you will need to contact the supplying department or agency.
With Terria platforms harvesting data from various custodians in real time, it is highly dependent on the reliability of those services. There are many types of errors which can be encountered when data is selected:
- Dataset hangs and possibly freezes the screen - that is because the application in your browser is trying to show an unusually large file.
- 404, 500, 501, 503 etc. and other common errors which mean data services are not available due to server hosting those datasets temporarily having issues.
- Dataset doesn't hang, no error message is displayed, but it doesn't show on the map.
What you can do:
- Come back to the dataset later (it might have been a temporary outage of the custodian server).
- Refresh the view and clear the cache (i.e. "browsing history").
- When there is no visible error, try first "zoom to extent" functionality or just zoom in very closely (under 100m) into an area of interest and wait for the app to "load" the images. Monitor the "loading" through the "load progress bar" at the very top of the map.
It depends on the platform, but in most cases there is a default selection from a number of difference sources including Microsoft’s Bing, Geoscience Australia and NASA. They are downloaded from the source as they are required, so they are as up to date as that service provides.
Before distributing any data from any of the Terria platforms it is important to understand the licence restriction for the data. All datasets are the property of the organisation which has provided them.
Therefore the restrictions for each Data Set may be quite different. The licence which governs the usage and distribution restrictions for each Data Set is shown in the About this data for the Data Set. To Display this information click on the title of your preferred data set in the Data Catalogue.
The reliability will vary between data sets. To understand the reliability of a particular data set, click on the title of the data set in question in the Data Catalogue for more information. The metadata which is shown in the Data Catalogue may offer sufficient information or you may need to contact the listed data provider.
Most of the base maps are provided by services for the whole world. There is no value in suppressing the display of the rest of the world, so you can view it if you wish. (Take a look at Mt Everest or the Grand Canyon in perspective view - they’re cool!)
The platforms' specific data does not cover the rest of the world!
You will need to refer to the organisation which provides the Data Set which contains the issue. Click on the title of your preferred data set in the Data Catalogue to find out provider's details.