Hi, thankyou for the extensive explanations in this video and the use of different tools. However, when I use the service area tool (layer) not a network but only one line is generated with the 'travel costs' I indicated. Do you have a clue why you got the raster and I got only one possible route? Kind regards :) [Update] my raster was not a 'real' network but consisted of individual lines
Hi Anne, many apologies for not getting back to you. Without seeing your particular problem on-screen, it is pretty difficult to say. Sometimes if lines don't connect *exactly* vertex to vertex, the algorithm assumes the network is not connected together. It needs the node locations to be snapped to each other to form a network dataset. The other thought would be that perhaps your cost parameters are off. With some of the tools the impedance is defined by the base units of the coordinate system you're using. If your coordinate system is not in meters or feet-but perhaps you're data are unprojected and using decimal degrees-then you're likely getting very strange results. Please feel free to contact me via my website if you'd like to have a quick screenshare. Good luck! www.rhumbline.us
![GEOG-1026 [Tut-A-2.2] Making Isochrones with Valhalla in Q](http://i.ytimg.com/vi/7ISAEODyrog/mqdefault.jpg)
![GEOG-1026 [Tut-A-2.2] Making Isochrones with Valhalla in Q](/img/tr.png)
Thanks for featuring the QNEAT3 tool in your tutorial! Its nice to see people using it in network analysis!
My pleasure! Thanks for commenting (-:
There is also Space syntax plugin (Catchment analyser) and find it to be good.
14:19 if I am going to use the travel time will I also convert it into meters?
love you)
Hi, thankyou for the extensive explanations in this video and the use of different tools. However, when I use the service area tool (layer) not a network but only one line is generated with the 'travel costs' I indicated. Do you have a clue why you got the raster and I got only one possible route? Kind regards :)
[Update] my raster was not a 'real' network but consisted of individual lines
Hi Anne, many apologies for not getting back to you. Without seeing your particular problem on-screen, it is pretty difficult to say. Sometimes if lines don't connect *exactly* vertex to vertex, the algorithm assumes the network is not connected together. It needs the node locations to be snapped to each other to form a network dataset. The other thought would be that perhaps your cost parameters are off. With some of the tools the impedance is defined by the base units of the coordinate system you're using. If your coordinate system is not in meters or feet-but perhaps you're data are unprojected and using decimal degrees-then you're likely getting very strange results. Please feel free to contact me via my website if you'd like to have a quick screenshare. Good luck! www.rhumbline.us
Thanks so much!
Video starts at 09:12
Thanks so much!
and Can U send my the tutorial data !