June 2005
Beginner to intermediate
372 pages
10h 1m
English
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Name
VirtualSpatialData (ODBC/OVF)
Synopsis
This is an OGR extension to MapServer. It allows you to connect to databases that don't explicitly hold spatial data, as well as flat text files. Your data must have an x and a y column, and the data may be accessed through an ODBC connection or a direct pointer to a text file.
Types of databases
The VirtualSpatialData OGR extension has been tested with the following databases and should, in theory, support all ODBC data sources.
Oracle
MySQL
SQL Server
Access
PostgreSQL
Types of flat files
Comma, tab, or custom delimited text/flat files work with VirtualSpatialData.
Create the data source name (DSN)
Specific notes about creating a DSN on Windows and Linux can be found by searching the MapServer reference documents site at http://mapserver.gis.umn.edu/doc.
On some Windows systems you must create a SYSTEM DSN.
Test your connection
Test your connection with ogrinfo. The syntax for this command
is:
> ogrinfo ODBC:user/pass@DSN table
ogrinfo examples
Here's an example that accesses a comma-separated text file through ODBC; it's a flat text file coal_dep.txt containing lat/long points:
unknown,na,id,id2,mark,coalkey,coalkey2,long,lat
0.000,0.000,1,1,7,87,87,76.90238,51.07161
0.000,0.000,2,2,7,110,110,78.53851,50.69403
0.000,0.000,3,3,3,112,112,83.22586,71.24420
0.000,0.000,4,4,6,114,114,80.79896,73.41175If the DSN name is Data_txt, the ogrinfo command to see a list of
applicable files in the directory is:
> ogrinfo ODBC:jeff/test@Data_txt INFO: Open of `ODBC:jeff/test@Data_txt' ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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