All; It isn't the networ because the tool works fine when I interpolate the results as points instead of a raster. I think it is in how it bulbs the tin, I will have to do more checking. Thanks; Tyler
On Wed, 25 Mar 2020 at 17:27, kirk <[email protected]> wrote: > Nicolas is right. There is good chance the topology is a bit messed up. > You can spend Lot of time fixing it up so I would suggest downloading the > gis basmap layers from the pei government website. There us a large scale > database for Charlottetown (1:2000) that will work better for you. Just > search gis database pei. > Kirk > > > > Sent from my Samsung Galaxy smartphone. > > -------- Original message -------- > From: Nicolas Cadieux <[email protected]> > Date: 2020-03-25 12:35 PM (GMT-04:00) > To: Tyler Veinot <[email protected]> > Cc: QGIS User List <[email protected]> > Subject: Re: [Qgis-user] Isochrones > > Hi, > > The first thing I would do is to check the network integrity. Perhaps > some road are not connected (snapped). You also need a snap and break at > every intersection. You can do some of this by exporting all the end node. > Check for multiline vs lines. You can split all of those in the vector > menu. Your problems are likely linked to a bad network topology. Users of > that network could perhaps confirm this? I have used it but not for this > type of stuff. > > Nicolas Cadieux > > > Le 25 mars 2020 à 10:22, Tyler Veinot <[email protected]> a écrit : > > > > > > All; > > I have a network, Canada National Road Network it is a free download, > that I am trying to use for PEI and the City of Charlottetown to find out > what area is within X time of various points of interest. I used Here for > QGIS to get the initial result but QGIS has a tool built in Network Analyst > that has Service Area from Network and from Point, also and QNEAT that has > 6 isochrone tools for doing exactly what I am trying to do. For some reason > though the results don't seem to match the network. I would expect the from > the point of origin the shortest times to be along the lines and radiate > out. > > What tools are you guys using to do this kind of work? Do my values for > forward backward both direction need to be numeric? Any tutorials on using > these tools? > > Thanks; > > Tyler > > _______________________________________________ > > Qgis-user mailing list > > [email protected] > > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > _______________________________________________ > Qgis-user mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >
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