Nakaner has commented on the following diary entries

Post When Comment
Using Benchmarks for Imagery Offsets 6 months ago

Hi Doug,

I do not know what increased level accuracy came with any adjustments made by NGS.

Adjustment in this context is geodetic term. If you do tringulation, the sum of all interior angles of a triangle has to be 180°. If you measure these angles in field, you will get a sum which is not 180°, e.g. 179.854°. Now you have more measurements than necessary (two angles are necessary) and can adjust your measurements. You would add (1/3)*(180-179.854) to each measured angle. This is an very very easy adjustment.

In geodesy, you would usually adjust whole networks of angle, distance and GNSS¹ measurements.

I do not find a good site which explains geodetic adjustment good and understandable for non-geodesists (I could give you only some German Wikipedia articles).

Best regards

Michael (studying geodesy)

¹) GNSS (global navigation satellite systems) compromises GPS, GLONASS, Baidu, Galileo etc.

COFFEEDEX & the single-tag revolution 8 months ago

I think that OSM is the wrong location for prices of goods. OSM is a geographical database. I suspect that you just do not want to (1) run a separate database and (2) do not want to care about linking objects between OSM and your database.

You might say that coffee prices comply with "We map what's on the ground.". I agree with you at this point. But one of the main problem is that coffee prices are hard to maintain (keep up to date).

If someone maps coffee prices, what will be the next good whose prices is being stored at OSM? Decaffeinated coffee? Hot chocolate?

I know that some prices are mapped at OSM. Those prices usually are services like parking fees, fees to store luggage at a locker or going to toilet. But all these prices are paid for services which are often offered for free. Most car parkings are free (your town may be an exception), most toilets can be used without paying 1 Euro (you might have to buy something if it is a shop's customer toilet). Coffee at a cafe usually is not for free.

There are a couple of partially-geographic information at OSM, e.g. opening hours, phone numbers, websites etc.

Just a word about Wheelmap: Wheelmap is an editor about wheelchair related information (and some other POI tags). Wheelchair accessibility is a physical feature.

How can I get accurate locations in a forest ? 10 months ago

If you want to do DGPS, you need to recievers which output raw data. One receiver is mounted at a position with known, accurate coordinates, the second receiver is the receiver you carry with you. If you want to know your position in real time, you have to have a data connection between the to receivers (e.g. via Internet over cell phone networks) and the basis has to send its data via a NTRIP server. That's why post-processing is easier. 10 months ago


your tool is the tool which has lacked until now. People are usually focused on adding new POIs but few people actively look after the POIs in their area.

I miss following features (ordered from very useful to useful):

  • a Nominatim search field (very useful to switch an area)
  • buttons "edit this area in JOSM" and "edit this area in iD"
  • a filter function in order to show only very old POIs which should be checked first

Less important but useful for spreadening this tool (ordered from a little bit important to unimportant)

  • a JOSM plugin like the OSM Notes plugin (maybe you could reuse parts of its code)
  • for gamification: user statistics (user X has reviewed Y POIs) and area statistics (The POIs of this town have been reviewed just ago/There are no reviewing users in this town.)
  • for the users who monitor their town/area: RSS feed about recent review entries in a bounding box

Have you thought about uploading the code to a public repository?

Have you thought about translating the interface into other languages? I could do the German translation.

Thank you for this great tool.

No joy this weekend 11 months ago

Hi Gerald,

I myself watch edits in a couple of areas in Germany where I live or lived using WhoDidIt. I do not have the problem of newbies deleting boundaries. This might have a couple of reasons:

  • Newbies in Karlsruhe and Heilbronn area ususally add POIs (everything else has been mapped yet).
  • The area in East Germany has few newbies.
  • Boundaries usually do not share nodes with other objects in Germany. They are usally independent ways and not tagged on highway ways, too.
  • We have less vandalism.

Do you in Brasil need mapper(s) from abroad monitoring (newbie) edits and giving you lists of changesets/users you have to write a message to every one or two days? I think it is easy to decide, if an edit is harmful, maybe harmful or not harmful, if someone does not understand the local language.

Best regards


Moovit attribution for OSM data about 1 year ago

The attribution is right now.

Ideas for a "suspect changesets classifier" about 1 year ago

The German user Oli-Wan (a very active German forum member) developes a tool to detect vandalisms and other bad changesets. He has written about his idea/work in German forum. You may contact him in e.g. in German or English.

Geschäfte eintragen over 1 year ago

Hallo noobbraten,

ich habe schon des Öfteren aus kostenlosen Anzeigeblättern Geschäfte und Gaststätten erfasst. Hast du die Daten aus aktuellen Quellen (z.B. aktuelle Zeitungen)? Dann wäre ein Ortsbegehung nämlich unnötig. Denn wer schaltet schon für sein nicht mehr existentes Geschäft eine Anzeige?

Nur vor einer Falle möchte ich dich warnen. Bei einer solchen Aktion habe ich mal in einer Anzeige gelesen, dass ein Friseursalon eine Filiale in einem anderen Stadtteil eröffnet. Da ich den Standort (die ganze Gegend, Standort selbst stand in der Anzeige) der neuen Filiale nicht kannte, habe ich nur eine OSM-Note gesetzt. Die Antwort war bald darauf, dass dort nichts sei.

Viele Grüße


Tag für Quellenangaben eigener Geodaten over 1 year ago

Taggt ihr damit jedes Objekt, für das ihr eure eigenen Geodaten als Quelle verwendet habt? Mittlweile ist es üblich, dass man dieses source-Tag am Änderungssatz anbringt. Denn für solche Meta-Informationen sind Änderungssätze gedacht. In JOSM gibt es ein entsprechende Input-Box im Upload-Dialog.

SFSU Campus Mapping over 1 year ago

I agree OSMNZ and Rovastar, JOSM is the better tool. JOSM's features can be extended by a lot of plugins (Edit -> Preferences -> plug icon). For the first steps I suggest:

  • building_tools allows you to draw a rectangular building with three clicks. Just type B and then click–click–click.
  • utilsplugin2 offers some additional features. From my point of view, the most important is splitting areas (or buildings). Mark the two splitting points in the polygon outline and type Alt+X

For editing geometry of lines and polygons I suggest the JOSM manual.

Other than iD, JOSM warns you if your edit may be destructive. For example, you will get warnings if you move more than 20 nodes at the same time, damage relations or multipolygons or use deprecated tags.

Thank you for your good changeset comments.

Quickly Mapping Stores & Street Numbers w Android - Quick Review of the Tools over 1 year ago

Hi Sa3dany,

Can you please explain how you imported the data using JOSM?

KPM = Keypad Mapper 3

  1. Download the area where you walked as usual.
  2. Create a new layer in JOSM using File -> New Layer. Then load the OSM file which has been created by KPM (you do not have to email it, just load it via USB onto your computer). At the same time you can also open the GPX file (it will be placed at a different layer automatically).
  3. Switch between both OSM layers (the one from the API and the KPM layer) and place the address nodes in the middle of the buildings (you can use Bing or another image service, too).
  4. Add street, city, postcode etc. to the nodes at the KPM layer.
  5. Delete all those nodes at the KPM layer which you do not want to upload (because of typing errors, already existing data in OSM etc.).
  6. Mark all nodes at KPM layer and delete the date tag KPM has created.
  7. Merge both OSM layers by right-clicking at the KPM layer in the layer manager at the right and choose "merge layer".
  8. If there are already building outlines, copy the tags from the nodes to the building outlines. The shortcuts are Ctrl+C and Ctrl+Shift+V. I have changed them to I (for input) and O (for output). :-)
  9. Delete all those nodes whose tags you have copied onto the building outlines.
  10. Upload the merged layer.

I use the GPX KPM created to evaluate the GPS accuracy of the created nodes.

Best regards,


Mapping Botswana via Facebook over 1 year ago

If the local people have a poor internet connection, it would be better if they use JOSM. With JOSM you do not need to download a lot of data. Just the raw data from OSM API and the Bing images.

This is only one of the points for JOSM.

When I started mapping in August 2011, I only had a laptop with JOSM, a GPRS connection (ping times 1–8 seconds!). Instead of Bing I used a GPS reciever at that time. Ok, the last thing, the GPS reciever, might be expensive.

OpenStreetMap-Gebäudeumrisse beim VVO over 1 year ago

Eine Nennung von OSM im Impressum ist IMHO nicht korrekt. Auf steht:

For a browsable electronic map, the credit should appear in the corner of the map.

Das ist beim VVO aber nicht der Fall. Hast du sie auf die fehlende Namensnennung hingewiesen und das mit dem Impressum gesagt?

Lokaler Fahrradstadtplan auf OSM-Basis over 1 year ago

Hallo keinseier,

ist dir die Kritik von Seiten der Community am Lübecker Fahrrad-Mappingschema bekannt?

Der große Nachteil des Lübecker Schemas ist, dass es nicht mit dem normalen, via Proposal-Verfahren eingeführten und akzeptierten cycleway-Schema kompatibel ist.

Viele Grüße


Erste Beitrag zum OSM-Projekt geleistet over 1 year ago

Hallo Eifel-Scout,

willkommen bei OSM.

Erstmal vielen Dank, dass du als Newbie gleich Änderungssatz-Kommentare eingibst. Das machen Neulinge meistens nicht und auch manche alte Hasen geben nur ein nichts Aussagendes "fixing something" ein.

Zur Verlängerung der Kirchstraße in Illerich habe ich noch einen Hinweis an dich. Ein paar Tags hättest du dir sparen können. access=official heißt, dass man den Weg benutzen muss (eigentlich nur bei benutzungspflichtigen Radwegen als bicycle=official sinnvoll). Da das access-Schema ein hierarchisches Schema ist, schließt motor_vehicle=agricultural motorcar=agricultural und motorcycle=agricultural ein. motor_vehicle (Kraftfahrzeuge) ist nämlich eine Obergruppe von Automobilen und Motorrädern. Siehe dazu auch die Dokumentation des access-Schemas im Wiki und das Verkehrszeichen-Tool.

Ich persönlich tagge Feld- und Waldwege (highway=track) NICHT mit motor_vehicle=agricultural, da meiner Meinung nach highway=track ein Kfz-Durchfahrtsverbot mit Landwirtschaft-frei impliziert. Sollte dann doch mal ein Weg für Kfz ganz frei sein, ist es für mich je nach Nutzung ein highway=service (eher kurze Aussiedlerhof-Zufahrt) oder highway=unclassified lanes=1. Service und Unclassified heißt noch lange nicht, dass der Weg asphaltiert/betoniert sein muss.

Viele Grüße


Mapping China over 1 year ago

If the data is not public domain you have to ask the copyright holder (in this case the government) if they allow using their data for OSM.

If you have more questions I suggest you to write at talk mailing list or at the forum because there are more people reading. The password for the OSM Forum is the same as for

Vier Verfahren zum Adressmapping im Vergleich over 1 year ago

Normalerweise die Hausnummern (addr:-Tags) an den Gebäudeumring. Wenn es ein Doppel-/Reihenhaus oder Plattenbau ist, das Gebäude entsprechend aufteilen. Wenn eine Trennung nicht eindeutig erkennbar ist, dann setzt man die addr:-Tags auf den Eingang oder etwa als eigentständige Punkte mitten in die zugehörigen Gebäudeteile. Nicht eindeutige Hausnummernzuordnung gibt es eigentlich nur in Innenstädten/dicht bebauten Gebieten, wo ein Haus zwei Eingänge mit unterschiedlichen Hausnummern hat.

Bahnhofsmapping – ein Lückenfüller over 1 year ago

@Spitzbart Da ist mir keins bekannt. Versuchs mal mit passenden Suchbegriffen mit dieser Google Custom Search.

Gelöscht over 1 year ago

Die einzige Lösung, die mir einfällt, ist den Inhalt des Blogposts durch "Inhalt gelöscht" zu ersetzen. Quick and dirty, aber es funktioniert.

Umzug over 1 year ago

Vielen Dank nochmal, insbesondere für die vielen Gebäude und Adressen in Brackenheim.

Wenn ich Brackenheim mit Bad Rappenau samt Umland vergleiche, fehlen eigentlich nur

  • Adressen und Gebäudeumrisse in einzelnen Teilorten von Brackenheim sowie im mittleren/oberen Zabergäu
  • Landnutzung außerorts

Auch in "fertigen" Gebieten kann man noch mappen, z.B. Dachformen. OSM2World, F4-Map