Frequently asked questions

Table of Contents

  1. Common questions
    1. For what purposes is the service designed?
    2. Why are not all the coordinate reference systems of Finnish cities or municipalities supported?
  2. Technical questions
    1. A wrong language is used on Web page after I changed the language on the main page
    2. While changing the datum or coordinate reference system (CRS) using the mouse wheel or keyboard arrows, the other related fields do not change.

Common questions

For what purposes is the service designed?

The service has been firstly designed to serve the public accurate coordinate transformations used in Finland. Some of the reasons why to use the service for these transformations include:

  • A Geographic Information System (GIS) with the needed or enough accurate transformations is not available.
  • It is not possible to install on the computer a coordinate transformation desktop application.
  • The need for accurate coordinate transformations is random or meager.
  • Testing of own implementations against the service´s transformation results.
  • Testing implementations that you are planing to purchase or other take into use.

Secondly the service is used to publish digital material concerning coordinate transformations. These materials include:

  • Geoid models
  • Transformation grids
  • Publications and information sheets concerning coordinate reference systems and transformations

Why are not all the coordinate reference systems of Finnish cities or municipalities supported?

The service currently support only those official coordinate reference systems that should be used or are used nationally. Cities and municipalities on the other hand use a wide variety of CRSs, which are local.

If you need to transform coordinates from some of these systems to a national system, you can download the transformation parameters for a majority of these systems from the National Land Survey (NLS). After transforming the coordinates using the NLS's parameters to the kkj you can use this service to transform or convert the coordinates to some other nationally supported CRS.

Technical questions

A wrong language is used on Web page after I changed the language on the main page

Before you changed the language, the language was determined based on your Web browser settings. If you already were on some Web page of this service and after changing the language return to the same page, the content might not change as the browser has stored the Web page to make your surfing faster. Just refresh the Web page.

While changing the datum or coordinate reference system (CRS) using the mouse wheel or keyboard arrows, the other related fields do not change.

Some browser developers, like Mozilla Firefox, read the W3C standard very strict (usually not at all a bad thing). In the standard in question reads that for a select box where only 1 item is shown, the onChange function is only triggered after the component has lost focus.

You have choices to go around this problem:
  • Do not use the arrow keys. Instead, use your mouse.
  • Hit the enter key after choosing the datum or CRS by the keyboard or mouse wheel.
  • Change the focus to some other field after choosing the datum or CRS by keyboard or mouse wheel.