I think that I have answered my own question below is from the gdal website:
*PROJ.4 Definitions: A PROJ.4 definition string can be used as a coordinate
system. For instance "+proj=utm +zone=11 +datum=WGS84". Take care to keep
the proj.4 string together as a single argument to the command (usually by
double quoting).
*So I would replace the epsg with the PROJ.4 definition ("+proj=merc
+datum=WGS84 +over") when using ogr2ogr to reproject the builtup_area
shapefile.
John*
*
On Fri, Dec 3, 2010 at 6:38 AM, John Mitchell <[email protected]>wrote:
> Dane,
>
> How would I reproject the builtup_areas shape file? The current projection
> is listed as &srsmercator (<!ENTITY srsmercator "+proj=merc +datum=WGS84
> +over">) unlike the other 2 projections for the shape files which include
> the epsg code within its variable name: &srs900913 and &srs4326.
>
> I use ogr2ogr to reproject the shape files but I need to know the current
> epsg code in order to reproject.
>
> John
>
>
>
> On Thu, Dec 2, 2010 at 4:14 PM, Dane Springmeyer <[email protected]> wrote:
>
>> Yes, you should build indexes for them, but first you should reproject
>> them to epsg:900913 and change the srs to match that projection in the xml
>> files, if you want the fastest rendering.
>>
>> The .sbn and .shx are ESRI specific extensions which are ignored by
>> mapnik.
>>
>> Dane
>>
>>
>> On Dec 2, 2010, at 12:57 PM, John Mitchell wrote:
>>
>> Part of setting up open street map data for hosting is to get 5 shapefiles
>> but 2 of these shapes files (listed below) don't have an associated .index
>> file:
>>
>> $ wget
>> http://www.naturalearthdata.com/http//www.naturalearthdata.com/download/10m/cultural/10m-populated-places.zip
>> (1.5 MB)
>>
>>
>> $ wget
>> http://www.naturalearthdata.com/http//www.naturalearthdata.com/download/110m/cultural/110m-admin-0-boundary-lines.zip
>> (38 KB)
>>
>>
>> I noticed that these 2 shape files have 2 extra files .sbn and .shx which
>> the other 3 shape files don't have.
>>
>> Should I run shapeindex.exe against this 2 shape files or just leave them
>> the way they are?
>>
>>
>> Thanks,
>>
>> John
>>
>>
>>
>> --
>> John J. Mitchell
>> _______________________________________________
>> Mapnik-users mailing list
>> [email protected]
>> https://lists.berlios.de/mailman/listinfo/mapnik-users
>>
>>
>>
>
>
> --
> John J. Mitchell
>
--
John J. Mitchell
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