[josm-dev] Meters to Pixels

[Tobias Wendorff]

Am Do, 28.10.2010, 12:04 schrieb Irene Pucci:
> There is a method that converts meters in pixels?

Since digital screens have different pixel sizes, there
are two main specifications in GIS world:
1. based on 96 ppi (about 0.026458333 millimeters)
2. based on 0.28 millimeters (about 90.71423 ppi)
3. based on your real monitor

1. has historic reasons
2. is an OGC-standard: http://www.opengeospatial.org/standards/sld
3. you can check this on http://www.infobyip.com/detectmonitordpi.php

1. Is used on ArcGIS (I only know for v9.x)
2. Is used on Mapnik.

Best regards,
Tobias