Functions common to different types of geometry
- Coordinate conversion
- Buffer
- Extract the nodes
- Group objects
- Explode geometry
- Show range
- The longest distance
- The shortest distance
- Center of gravity
- Describe with a circle
- Convexity
- Line on traverse (holes)
- Simplify the object
- Rotate the specified angle
- Size change
- Extract the intersections
- Outline
Functions for the polygon layer
- Change the letter to uppercase
- Change letters to lowercase
- Return the length of the text
- Round a floating point number up
- Round a floating point number down
- Round to the specified number of decimal places
- Position
- Search Text String – Returns part of a string value
- Trim
- Return string with changed fragments
- Return a piece of text containing n characters from the left
- Return a piece of text containing n characters from the right
- Mathematical operators on columns
- Mathematical operators on numbers
- Calculate the area
- Calculate the perimeter
- Return the X coordinate of the current object
- Return the y coordinate of the current object
- Zwróć najmniejszą wartość współrzędnej X
- Return the largest value of the X coordinate
- Return the smallest value of the Y coordinate
- Return the largest value of the Y coordinate
- Calculate the vertices
- Minimum distance to the subject
- Greatest distance between geometries
- Distance between geometry centroids
- Distance between geometry bounding boxes (smallest)
- Distance between geometry bounding-box centroids
Viewing serivce
What is Web Feature Service (WFS)?
“The Web Feature Service (WFS) represents a change in the way geographic information is created, modified and exchanged on the Internet. Rather than sharing geographic information at the file level using File Transfer Protocol (FTP), for example, the WFS offers direct fine-grained access to geographic information at the feature and feature property level.” ~ OGC
How does WFS work in practice?
To grant you ability to provide WFS as download service, we implement an open source solution – GeoServer.
“GeoServer is a Java-based server that allows users to view and edit geospatial data. Using open standards set forth by the Open Geospatial Consortium (OGC), GeoServer allows for great flexibility in map creation and data sharing.” ~ GeoServer
How to provide WFS in MapMaker.online?
To provide Web Feature Service as download service, it’s the same procedure as WMS. First you need to edit the project which you want to generate WFS for.
After you’ve entered your project you need to click on the cog icon at the Services tab. 
A window will pop up asking you to select layers which you want to provide WFS for. After you’ve selected desired layers, press “Publish” and they will be ready to be served through Web Feature Service as download service.
You will now be able to notice, that in “Services” tab appeared two services with one being the WFS.
Upon clicking the button, you’ll be presented with a service address that is ready to be used. For example: https://geomapmaker.online/geoserver/UniejowMwMpzp/wfs
How to use WFS?
You’ve clicked on the link and got something that looks like an error or some programming gibberish? 
Don’t fret, it’s likely that everything is working properly.
Network services’ addresses work differently from what you would expect from an ordinary Internet link. Without a dedicated interface that can process network services such as WFS, getting the data you need will require knowledge and skill to create quaries to databases. If you want to go about in-depth about creating requests to WFS servers manually, click here.
But don’t worry! If you’re not skilled in working with databases you’re not doomed.
There are several examples of software that allow you to take advantage of Web Feature Services using user-friendly interfaces such as MapMaker.online’s GeoNetwork, QGIS or ArcMap.
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