Latest Contributions by GavinRudge

‎06-11-2018

Many thanks for the replies to this post, Melita and Duncan. I achieved a workaround by transforming to WGS84 and thence to OSGB. The accuracy looked good to couple of metres or so, which is sufficient for the analysis I'm working on. I followed Melita's suggestion, repeating all of the steps in the advice from ESRI but ensuring the addition of the carriage return. I still get the same issues, the transformations are not visible in the transformation drop-down, but there is a transformation in the co-ordinates part of the environment variables that looks promising. After selecting it, the warning triangle stays on on the transformation drop-down on the project dialogue box, so I'm assuming the tool is not picking up the transformation. When I run it anyway my points are all off as usual. I can live with the workaround for now, but would like to find a solution longer term as I could use the extra accuracy for one of my upcoming projects. I'd like to upgrade but I'm too busy. I have to test existing custom tools for forward compatibility and find alternatives or re-install the old version if I can't, so this is usually a day's lost work; although if 10.5 has also fixed the way the quick import tool mangles GML files, it may be worth my time!

‎05-30-2018

I'm projecting a shapefile currently supplied in ETRS89 format to OSGB 1936 in ArcGIS 10.4.1. I have followed the advice given by ESRI UK (Adding the new OSTN15 NTv2 transformation — Esri UK ) to ensure that the latest transformation is available. I have downloaded the transformation files, added them in my Arc directory as per the instructions, and can clearly see the files. However, when I use the project tool in ArcCatalog the transformation (OSTN15_NTv2_ETRStoOSGB) is not visible in the dropdown. Also if I manually type the name of the transformation into the dialogue box it will not be recognised by the tool. if I project without the transformation, my points are out by about 105m. Is there some sort of path issue such that Arc cannot find the transformation?

‎10-06-2016

I have a set of sample points. I am measuring various things associated with them with reference to a network dataset so naturally my points are snapped to it to capture these data. However as part of may anaysis I am also interested in treating the snapping distance as a kind of error (way too boring to explain why) that I would like to quantify and use as a variable. I'm interested in knowing if I can do this with existing tools.

‎11-22-2012

Hi, this one's for users of UK data only I guess. I've got an ongoing network analysis problem which has been caused by an add in for the UK market, Productivity Suite, which unpacks OS data for use in Network Analyst. There is not a PS forum so I thought I'd post it here. Apparently PS service pack 6 and later fixed a problem of converting ITN Urban Path data for use with ITN roads data. Trouble is, since applying the pack, parts of the pop up screens are obscured by grey boxes and not all of the options can be selected when you are using the tool, (sloppy programming?) When you are using the OS data converter you get some options to select which content you want unpacking - topography, ITN layer, address point etc. When you select one of these, parts of the screen are obscured. In the case of ITN data, you can see a the check box for roads but I suspect there may be others for example for RRI and for paths. I tick the only box I can see (roads) and the tool seems to work OK. Then, when I move onto the next tool, the 'prepare data for network analysis' one, in the network options dialogue box the tick box for including the path network in the process is greyed out. I suspect this is because I was unable to select paths in the OS data converter. I can build the network but paths are absent. Has anyone else had this problem and fixed it?

‎11-19-2012

Hi thanks for this, Yes I'm using ArcGIS 10 on a Windows 7 paltform. I'd seen this tutorial, and kind of followed it. I'm trying to do something much simpler, I'm really building a pedestrian network and simply want to exlude roads that pedestrians have not access to. I finally got a workaround using hierarchy. All my hierarchy =1 roads happened to be ones that pedestrians could not use, and I managed to set up an exlusion for these using a function in the evaluator based on this that excluded them and this seems to work on route solvers now - I'm still not clear about how my original approach did not work though. I now have a different and more serious problem with my network - I'll post a separate shout out for help on this, as I think this is about connectivity rather than restrictions.

‎11-18-2012

I have a road link with a field called DescTerm which contains a string descriptor of the type of road. I want to create a restriction which excludes the use of motorways in my nearest facility and service area calculations. Using catalog I went into the properties of the network dataset, in the attributes tab created a new restriction. In the evaluators I used the following syntax: restricted = False If [DescTerm]="Motorway" Then restricted = True End If I entered restricted in the value box. I rebuilt the data set, brought it into a new map and set up a couple of points to create a route. The name of the restriction appeared already ticked in the restrictions portion of the analysis settings window of the network properties, so assumed everything was working OK, but my routes will not avoid the motorways. Can anyone tell me where I went wrong. Also when I use identify to select a section of a restricted road I see that the along property is traversable and only the against is restricted. I set the same evaluator for the from/to road links as the to/from. Any suggestions for how to get this restriction working properly? Many thanks, Gavin.

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Latest Contributions by GavinRudge

Re: Problem with an ETRS89 to OSGB transformation in the project tool

Problem with an ETRS89 to OSGB transformation in the project tool

Is there a quicjk and easy way to calculate all the euclidian distances between all of the points in a layer and their snapped points when snapped to a network?

Productivity Suite problem

Re: Setting a restriction on a network

Setting a restriction on a network