I need to combine a number of different ARWorldMap instances together. In other words, I need to create one instance with the combined anchors of the two (or more) instances of ARWorldMap.
I can share the same instance across the app, but it can be used differently by different groups of users, so I would eventually have to combine the same ARWorldMapinstance but with different contents later anyway.
If ARWorldMapdoes this automatically, then would it be just a matter of distributing and updating the same instance?
Thanks in advance for any help.
You cannot combine occurences of ARWorldMap together. The way to do it is to load a previous one and update it with new data / anchors / feature points (extending the map).
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my problem is following:
I have a handle class with many objects and I want to link them to each other.
So my vertex(1) from my class vertex needs to be linked to vertex(2) and vertex(3), so that my vertex(1) has the properties vertex(1).neighboor_vertex=vertex(2) (and vertex(3)).
This is just one thing that has to be done (actually I need to link and relink different classes to each other and because its millions of objects and want to do it in parrallel and the fact that linking is not working in parallel stops me from following steps).
So while worker 1 links vertex(1) to vertex(2), no other worker should be able to change the properties of both, they can lets say link 5 to 7 or so, and when the linking is done the new link of vertex(1) to vertex(2) and vertex(2) to vertex(1), needs to be updates to all other workers, so that when another worker wants to link vertex(3) to vertex(1), it has to know that it is alreay linked to vertex(1), otherwise there would be 2 different versions of vertex(1), one linked to vertex(2) and one linked to vertex(3).
So for the blocking that multiple workers cant change the the vertex I would need something like a mutex within the spmd, otherwise it wouldnt be threatsave...
What would be the best way to do this in Matlab?
Many Thanks in advance
Best regards
does anybody know if there is a way I can seperate only the crossroad nodes which are included in a .pbf file? Is this clue (if a node is crossroad or not) included in this file's format?
Another option to solve your issue would be to use the new Atlas project.
As part of loading .osm.pbf files into in-memory Atlas files, it takes care of doing way sectioning on roads:
Load your pbf file into an Atlas. You will then have an Atlas object that you could save to a file and re-use.
Use the Atlas APIs to access all the intersections
In the end, each Atlas Node which is connected to more than 4 Edges on a two-way road or 2 Edges on a one way road would be a candidate if I understand your question correctly.
I'm not aware of a ready-made solution for this task, but it should still be relatively easy to do.
For parsing the .pbf file, I recommend using an existing library like Osmosis or Osmium. That way, you only need to implement the actual semantics of your use case.
The nodes themselves don't have any special attributes that mark them as crossroads. So instead, you will have to look at the ways containing the nodes.
Some considerations when implementing this:
You need to check the way's tags to find out whether it's a road. The most relevant key for that is highway. The details depend on your specific use case – for example, you need to decide whether footways, forestry tracks, driveways, ... should count.
What matters is the number of connecting way segments at a node, not the number of ways. For example, a node that is part of two ways may be a crossroads (if at least one of the ways continues beyond that node), or may not (if both ways start/end at that node).
I am wondering if it is possible to do this as I am trying to build a traffic simulation model and may need to utilise this feature , should it exist, in my model.
There two, and only two, conditions under which a pair of turtles may be connected by more than one link:
If the links are directed, you can have two links, going in opposite directions.
If the links are different breeds.
You might consider alternatives like having a single link but adding a links-own variable to the links containing a weight, count, or other information.
Any fast ways to merge two nodes into one, without traverse the properties and relatioships myself?
Any advice would be appreciated!
You have to implement that yourself - including conflict resolution if e.g. both nodes contains the same property with different values etc.
Neo4j does not offer any support for this (since this is probably not a very common use case).
In one of my applications I have a requirement to fetch data from an NSMutableArray and store the data which we got in separate arrays in iPhone. Please provide a solution for me. How do I accomplish this?
Requirements are listed below:
Actually total projects are available in one array (this I got from server).
Total number of filters available in another array (this also I got from server).
Based on each filter (each filter is linked with few projects) I have to fetch projects from projects array.
I am able to fetch projects related to separate filter, but the problem is that after fetching the projects I have to store those projects in separate new arrays related to each filter (means here I have to create new array in runtime).
It is here that I am having trouble. How do I create arrays dynamically at runtime instead of declaring them in advance? Because the filters count will vary at any point of time at server side, I cannot predict in advance how many arrays I need.
I’m following this approach, but this is the issue I am facing.
Create one Mutable Dictionary in which add the project with respective filter and add that object in new NSMutable array.This you will each different project with respective filter.You can fetch the projects form respective Key for project.