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This document explains the usage of cookies on Please also refer to our Privacy Policy.

The website uses cookies.
The accompanying blog does not use any cookies.

What are cookies?

Cookies are small pieces of data which your web browser stores on your computer or mobile device at the request of certain web sites. They enable the website to remember your actions and preferences (such as login, language, font size and other display preferences) over a period of time, so you don’t have to keep re-entering them whenever you come back to the site or browse from one page to another.

Different types of cookies

A cookie can be classified by its lifespan and the domain to which it belongs. By lifespan, a cookie is either a:

As for the domain to which it belongs, there are either:

How do we use cookies? uses session cookies and persistent cookies.
Only first-party cookies are used, no third-party cookies are used on this site.

Below, we list the cookies which might be set by, giving their names and their purpose of application.

Persistent cookie. At some point, you will have seen the message »This website uses cookies!« when you entered Once you have clicked the button »Got it« to dismiss the message, that decision is stored in the cookie.
Session cookie. This cookie stores your session ID. A session ID is a unique number that the server assigns a specific user for the duration of that user’s visit. This way, can remember for that time – whether you activated the expert mode on our compare projections page;
– the setting of the filters in the thumbnail list and/or the Single View page
; – the viewing options you might have chosen.
A session ID might look like this: hhriq071lpl4d10imjfnocqsv4 It does not store any information about you or the device you use to visit or website.
Note that the settings mentioned above are not stored in the cookie itself! Instead, the web server temporarily saves, for example, the information: »The user with the session ID hhriq071lpl4d10imjfnocqsv4 activated the expert mode.« Technically speaking, the settings are saved to a so-called session variable which expires at the latest as soon as you close your browser.

Legacy Cookies

Until May 2018, used some additional cookies.
Currently, these cookies are neither set nor read, however they might still be stored in the web browser you use in case you visited our website before that date.

If detects these cookies on your system, it will try to delete them. Nonetheless they are listed below, for reasons of completeness and in case the deletion failed.

mp_user / mp_email
If you entered a comment on, there was the option to save the name and email address you provided to a cookie, in order to prepopulate the input form with this data on your next visit. This option has been removed completely. After all, most browsers offer the option to save input data anyway.
(Note: This refers only to itself. On, this option never existed.)
In case you activated the expert mode on our compare projections page, this cookie used to remember your choice. It has been replaced by saving this bit of information in a session variable as explained above.
This cookie saved the setting of the filters in the thumbnail list and/or the Single View page. This, too, has been replaced by using the session variable.

Deactivate Cookies

You can prevent the setting of cookies by adjusting the settings on your browser (see your browser Help for how to do this). Be aware that disabling cookies will affect the functionality of this and many other websites that you visit. Disabling cookies will usually result in also disabling certain functionality and features of the this site. Therefore it is recommended that you do not disable cookies.
However, even with cookies disabled, you will be able to retrieve all kinds of information that is offered by

Any more questions?

If you’ve got any more questions regarding the use of cookies on, feel free to contact us!