craig.taverner wrote
...
- Create a way-point node for these
...
Hi together,
I wonder why to add extra nodes to the graph (if I understand Craig
correctly)? Wouldn't you then end up in expanding twice the node count
(way-point nodes and OSM nodes themself, because you have to query the
Hi Peter,
the tests are running and now I get the following results:
cypher start n=node:geom('bbox:[9.9996186, 9.9996186, 48.4027913,
48.4027913]')
cypher return n
cypher
== +--+
== | n|
==
Hi together,
Maybe I am bit late on this topic but how is the progress so far?
Greetz, Daniel
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Hi Peter,
that works, yes! But I still can't do spatial queries with the OSMLayer over
the server page. Today I have written a small test program in Java which
also includes a bbox query for a specific point and then traverses to the
corresponding OSM node. So far I am satisfied with that (I will
Hi Peter,
unfortunately I can't get it to work. The layer named after osmpath could
not be used in query because of ':' and '/'. I don't know how to escape them
here. However I did not like the layer to be named in this way, so I changed
the OSMImporter to take 'layerName' and 'osmPath'. I now
Thanks Peter!
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Hi Peter,
I now have a graph with the 'geom' index + testnode from the above code and
imported some OSM data afterwards. I now want to find 2 nodes by bbox query
- 550349 and 205372 (see http://dl.dropbox.com/u/18693700/graph.png). How
can I achieve this? If I query for the bbox I should at least
Hi Peter,
I am more stuck today than yesterday oO I can't get the index to appear in
the indexmanager any more. First I dropped the database and started from
zero:
C:\neo4j-community-1.5\binNeo4j.bat start
SERVICE_NAME: Neo4j-Server
TYPE : 10 WIN32_OWN_PROCESS
Hi Peter,
first cURL doesn't like me:
C:\curl -X POST
http://localhost:7474/db/data/ext/SpatialPlugin/graphdb/addSimplePointLayer
{
message : Mandatory argument \layer\ not supplied.,
exception : java.lang.IllegalArgumentException: Mandatory argument
\layer\ not supplied.,
stacktrace : [
Hi Peter,
I have posted the statements in 1 line, but no success with cURL. I think I
have messed up the database at work, it was allready filled with nodes from
OSM testing. I now started a new database at home and also included one
additional line:
http POST
Hi together,
That would be cool. Atm I am deleting the data folder, that works too for my
testing purpose. I have played around with cypher and encounter some
problems. I have OSM nodes in the database and I 'guess' they have a spatial
index on the geometry (lat, lon). The view on the server
Hi Peter,
How do I add the Spatial plugin? I only have Cypher and Gremlin as server
extensions installed. I unzip Neo4j spatial into the plugins folder and then
send the JSON via curl to the database. But he can't find any of the needed
classes. Which files do I need from the spatial project and
Hi Peter,
I could now register the spatial index 'geom' to my database (I was missing
the zip file) - thanks so far.
cypher start n=node:geom('bbox:[10.0020654, 10.0020654, 48.4126496,
48.4126496]')
cypher return n
cypher
== +---+
== | n |
== +---+
== +---+
== 0 rows, 24 ms
So zero results
Hi Peter,
I guess the meta-inf entry for the org.neo4j.kernel.KernelExtension is still
missing. The repo URL https://github.com/neo4j/spatial.git is correct? It
states last commit was 4 days ago...
The build ends with error: http://dl.dropbox.com/u/18693700/git21.txt
Daniel
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Hi Peter,
I have JDK 1.7.0_01 on a Windows 7 64bit machine. After I added the
missing meta-inf entry org.neo4j.kernel.KernelExtension I could build the
project. Now I have a few more problems. I can run the tests for the
DynamicLayers and OSMImport without failure but then I am stuck at the
Hi Peter,
JDK 1.6 does the job! But only for building the project. Netbeans still
shows an error for the missing KernelExtension meta-inf, however it does not
prevent from running the OSMImporter. Lucene is still not working, maybe it
has something to do with that error which is at the
Tried Eclipse Java Edition and it seems that everything is working as it
should. I could at least start an OSMImport to an embedded database and
nodes were copied. I will have a detailed look tomorrow.
I still have a few problems with the Neo4j server itself. When I try to
batchinsert I get the
Hi I have some problems with the new build of Neo4j Spatial. First if I
checkout and try to build the following error occurs [ERROR]
spatial\src\main\java\org\neo4j\gis\spatial\indexprovider\SpatialIndexProvider.java:[38,0]
error: Internal error: java.io.FileNotFoundException:
Sure, here are the files, first after the checkout directly and then after I
add the missing entry (maybe you can correct this on the repository?).
http://dl.dropbox.com/u/18693700/git.txt
http://dl.dropbox.com/u/18693700/meta-inf_fixed.txt
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Hello Peter,
that sounds fine. I will probably compare some quad-tree against the
existing R-tree implementation. It will take some time until I start with
implementing something, but I will keep you informed.
Regards, Daniel
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Hello there,
first I have written a wall of text, previewed it and then the forum went
grey and all of the text has gone - AR!
In short: I have read some papers about different spatial indices in the
last days. The standard R-tree can be improved in various ways or even
replaced by
Retrieving data in constant time sounds very promising especially for routing
purposes. Did you allready have thoughts on algorithms that use hierarchies
or contraction of the network? In our students project we implemented some
approaches to reduce search space and have thoughts on the heuristics
First thanks to all of you for the hints and the detailed explanation of
Craig. Peter I was not into any code in detail yet, but I have had a look on
the (beta) wiki of Neo4j spatial.
Some more questions on the storage format of Neo4j: So the nodes, properties
and relationships are stored in
Hello Chris,
thanks for your postings, they are a great starting point for me to assume a
good performance of this database. However I have some questions left.
Lets say I have a node store and a property store. Both of them are
individual files. I am going to implement a GIS application which
Hello everyone,
I am going to write my master thesis about the suitability of graph
databases in GIS applications (at least I hope so^^). The database has to
provide topological queries, network analysis and the ability to store large
amount of mapdata for viewing - all based on OSM-data of
Hello everybody,
I have some questions regarding data storage in neo4j. How does neo4j store
the data on the physical level? Are elements which have a close relationship
in the graph stored in an adjacent way on disk? Any special binary format?
How do you treat SSDs compared to common harddisks?
Hello you both could have a look at the so-called k-shortest-paths problem.
There is some related scientific work[1] and implementations[2] for further
investigation.
regards,
Daniel
[1] http://www.mat.uc.pt/~eqvm/cientificos/investigacao/r_papers.html#K
[2]
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