Form

What are the NW and SE coordinates for?

The export is generated over a square area, defined with the north-west and south-east corners coordinates, for a specic date and time, with the level of detail specified by the zoom level.

What are the iteractions parameter, on the sun exposure form?

According to the ShadeMap documentation: "Number of discrete chunks to calculate shadows for between startDate and endDate. A larger number will provide more detail but take longer to compute."

File export

Why am I getting more than one TIFF file per export?

Because of computer memory limitations, areas that exceed the browser processing capacity are divided into several TIFFs, each one aggregating the maximum number of subareas possible.

What is the coordinate reference of the file generated?

The file is generated according to the WGS 84 coordinate reference system (EPSG:4326).

How can I interpret the values of the file generated?

• Shadows are exported in a binary system: 0 for shadows, 255 for sun.
• Sun light exposure values range from 0 to 240, and can be converted to the total minutes of sun exposure by multiplying this value by 6.

Privacy

Is it safe to check the box to store the API credentials?

The API key is stored on the local storage of your browser, in plain text. It is not sent to other services rather than the Mapbox and ShadeMap APIs. The APIs are accessed directly from your browser, without any brokers.

Can I delete the credentials, once stored?

Yes, just reload the page, and enter the application again, but this time unchecking the box to save credentials. Once you access after this, they will be removed.

The 🗺️ ShadeMap download tool is an interactive tool that allows to export shadow and sun exposure layers from ShadeMap over a custom area, with a high level of detail.

It aims to overcome the focus loss when exporting wide areas at ShadeMap online app. To achieve this, 🗺️ ShadeMap download tool divides the selected area into smaller ones and for each captures the required layer with a higher level of focus, aggregating them automatically into a single TIFF file.

It is based on Ted Piotrowski's work, which provides example scripts to export ShadeMap data, extending its scope to several layers and introducing an interactive user interface, that allows anyone to smoothly execute exports using their browser, without the need to download or edit any code. It also introduces batch exports, allowing to cover several timestamps in the same export operation.

Developed by U-shift, a research group from Instituto Superior Técnico, Lisboa, Portugal.

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