[Imports] polyshp2osm.py

[Sam Vekemans]

On Tue, Oct 20, 2009 at 4:07 PM, Ian Dees <ian.dees at gmail.com> wrote:

> On Tue, Oct 20, 2009 at 5:45 PM, Sam Vekemans <
> acrosscanadatrails at gmail.com> wrote:
>
>> Hi,
>> Can you give an example of a situation when you'd need to use multiple
>> source fields for 1 osm tag?
>>
>> Also, if your creating intersecting ways, double check to see that the
>> nodes are infact connected. (shp-to-osm doesnt connect the ways.
>> (thats why im not dealing with roads, and leaving it to the shp2osm
>> script to handle) but it seems all other features are fine though.
>>
>
> If this is important to you, I can quick release a version of shp-to-osm
> that does connect ways.
>
> I have code in the repository now for what I called "glomming". It hasn't
> shown up in shp-to-osm yet because I don't read the entire data file in to
> memory before writing it out (so I can read arbitrarily-large shapefiles).
> In order to do this, I would have to read the entire shapefile in to memory,
> leading to a restriction on the size of shapefile to convert.
>

Interesting,
That makes sence, so in order to make the nodes connected, you would need to
put the entire file into memory, then connect the ways, then output the
file.   (thats the same thing that shp2osm does)  so instead of using a
PostGIS database, it would just be quickly saved on memory in the
background).

So perhaps 'C' (connected) version of the shp-to-osm.jar program can be
made? ... even if it can only work for 'small' shp files.   I can add it
onto the script line so that it would 1st attempt to run this C version, and
if it 'fails' (because of the size), it would automatically skip it and move
onto the next task.  (or be defaulted to produce a 0meg .osm file which gets
omited with the -t option)

to: imports@ list
    There ought to be a way that shp files can be 1st 'sliced'..
Ie.  (Geographically cut into an arbitrary grid (regardless of the shape of
the polygon) 4, 16, 256 or whatever size)  so then each square can be dealt
with independently.
.... ya i know it can be done with ArchGIS, but were looking for a command
line alternative :)... Also, slicing AFTER processing will  help too.    Is
that something that osmosis can do?

cheers,
Sam
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