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Overview

OHDM uses several databases can create a number of export formats. Here is an overview:

The yellow components are provided by OHDM. That software is under GPL 3.0 and can be found in the OHDM Software Repository. OHDM uses and archives OSM data. We work on a web import application.

OHDM provides several output formats:

• OSM files. OHDM can produce an OSM file for a given date and a given region on earth. Those files can be e.g. used for offline viewers.
• stRDF files. Spatial temporal RDF is an extension of RDF which supports geometries.
• Mapnik: OHDM can produce the same files as osm2psql which are used e.g by mapnik. Those files have two additional date columns (since, until) declaring validaty of the objects. There is a patched Mapnik which understands both columns and can produce time sensitiv maps.

The transformation of all those structures are done by a Java program. It is recommended to use the jar. The rest of this section explains the parameters of this program.

##Parameters

• -o [file name] defines osm file name. This can either be an input or output file
• -i [parameter file name] defines name of a parameter file This paramater file has the following structure: servername:your_server_dns_name_or_ip_address portnumber:port_number username:a_user_name_with_appropriate_rights pwd:user_passwort dbname:database_name schema:schema_for_intermediate_database

Note: In this version: all databases MUST be located on the same database server