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Flag of Luxembourg.svg This user hails from Luxembourg.
OSM Logo This user submits data to OpenStreetMap under the name
Hot logo.svg Dmlu volunteers at Humanitarian OSM Team.
JOSM Dmlu submits data to OpenStreetMap using JOSM.
OsmAnd icon Dmlu uses OsmAnd, mobile map viewing & navigation app.

Flag of Portugal.svg Dmlu has mapped in Portugal.
lb Dem Benotzer seng Mammesprooch ass Lëtzebuergesch.
de-4 Dieser Benutzer beherrscht Deutsch auf muttersprachlichem Niveau.
fr-4 Cette personne peut contribuer avec un niveau professionnel de français.
en-4 This user speaks English at a near-native level.
pt-4 Este usuário/utilizador tem domínio do Português similar ao de um nativo.

Hi, my name is David Morais Ferreira. I like to map in Luxembourg and Portugal! Feel free to read my interview at If you are looking for source code I wrote, you can (hopefully) find it on my GitHub profile (

To get in touch with me, you can write me a message on the OSM website or contact me on IRC :)

What do I do?

The following section contains links to various projects I am currently invested in:


Power Network in Luxembourg (January, 2019)

Visualization of the electrical power network in Luxembourg (January 2019) after a focused mapping effort that started around August 2018. The newly added power lines are drawn in green and the existing power lines are drawn in blue.