# Tag Info

14

I found this metadata file indicating: C = County I = Interstate M = Common Name O = Other S = State recognized U = U.S.

11

you can check out ET GeoTools for ArcGIS here. Beside this you can check out Feature To Line (Data Management) here but you have to some engaging in. and check out this question Find tunnel 'center line'? here... skeletisation algorithms may can help you to develop your tool. Input Dataset Result i hope it helps you...

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IRIS is one existing open-source solution you should probably be aware of: From Wikipedia: IRIS (Intelligent Roadway Information System) is an open-source Advanced Traffic Management System (ATMS) software project developed by the Minnesota Department of Transportation. It is used by transportation agencies to monitor and manage interstate and ...

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A general way of solving this problem is to find all polylines having a node whose valence = 1. A valence table may be created either in memory or on disk, using a key that is the hash of the x&y of each end point of each polyline. You may wish to truncate x and y may be truncated if polylines are not snapped. Each node is labeled by its degree (or ...

9

Finally i got a solution. I converted the polygon to image in arcgis using Polygon to raster tool. Then reclassified it and used Automatic vectorization. About 90 percent accuracy is obtained using this method. There are only little snapping mismatches and also the line is drawn through the exact centre. I think this is the best way if you do not have a ET ...

9

Collapse Dual Lines To Centerline (Cartography) This is a specific ArcGIS tool requiring ArcInfo License ArcGIS for Desktop Basic: No ArcGIS for Desktop Standard: No ArcGIS for Desktop Advanced: Yes Convert you polygons to lines first "Derives centerlines from dual-line (or double-line) features, such as road casings, based on specified width ...

9

I had to do this just recently. Using ArcGIS 10: If you only want to symbolise the dead ends you can just set up a Topology on the roads featureclass and set the rule "Must not have dangles". this will put a marker on every feature that has a dead end. Alternatively, run the "Feature Vertices to Points" Tool (Located in Data Management Tools --> Features) ...

9

I would recommend using image segmentation with the free software SPRING, available from the Brazilian National Institute for Space Research. Documentation is available here and tutorials are available here. Image segmentation produces high classification accuracy compared to purely pixel based classification methods (e.g. ISODATA, Maximum Likelihood, etc). ...

8

These two modeling available in ESRI software. After you can run 1st modeling we will do trim on lines model 2.

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This is known as swept-path analysis. It is one of those calculations that seems initially to be relatively trivial but soon becomes obvious that there is a lot more to it because it is not just the tightness of the turn that is important. Some of the other things to consider include: Length of the vehicle and point of articulation. Turning circle of the ...

8

Considerations First thing to consider, you might remove freeways and ramps from your road system before you start, depending on your interpretation of a block or intersection. First problem is knowing the state of your road system. If road centerlines are split at each intersection and only at intersections, then we proceed with Features Vertices to ...

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Activate symbol layers in the advanced options of your road style.

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I'll try to analyze your use cases from a QGIS perspective: Software that allows me to drive a specific route and store that as a working model. There is a GPS Tool for live tracking of GPS devices. But I guess you could go with the simpler version of loading the recorded GPX files into QGIS after collection. Download some GPS/County information to ...

6

This paper by Koichi Yagi shows how the accelerometer in a smart phone can be used to measure roughness. Update Whatever software you end up using, I think it needs the ability to manage road condition surveys. An important role of pavement management is prioritizing road repairs and deciding when to re-surface instead of repair. I'd like the road in ...

6

GRASS method: v.clean in={your input vector} tool=rmdangle thresh={your threshold} out={output vector}

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In ArcGIS Standard or Advanced, you can put your road network into a Feature Dataset in a Geodatabase. You can then set up a topology on the network and create a topology rule which identifies "dangles". This will identify all roads which do not connect to something at one or both ends. Note, this will also identify potential errors in your network which ...

5

You could try the Identity tool, using your line features as the input, and polygons as the identity features: "When the Input Features are lines and the Identity Features are polygons, and the Keep relationships parameter is checked (relationship set to KEEP_RELATIONSHIPS), the output line feature class will have two additional fields, LEFT_poly and ...

4

A GIS desktop and/or web solution would help you answer these question. you could use something like QGIS or GeoServer as a desktop or web solution. to get accurate county road data you could see if the county has a GIS department to obtain data. If not most States have a open clearinghouse GIS web site to download data or you could possible get data from ...

4

As with everythin in GIS there's more than one way to do it: ArcGIS has a feature to do just this, See Divide line function. Of course, remember that you rarely have an exact division unless you use the percentage option (i.e. you will get a bit left over). And, to be honest, I found it would not always work perfectly but it doesn't do too bad a job. ...

4

There are a few ways to do this. For the intersections you can use a tool in QGIS (Arc I am sure too) called Line Intersections (Vectors - Analysis Tools). As for the blocks, what I have done for that is to have a polygon of the AOI which covers the entire area. Then I use the roads to cut that polygon into polygon segments. This will give you blocks of ...

4

I think that "node centrality" concepts, in the graph theoretic literature, may be helpful. Here is an introduction to centrality measures in graphs.

4

Update you roads direction using a formula something like if (45 <= (360 + math.atan2((!Shape.lastpoint.X! - !Shape.firstpoint.X!),(!Shape.lastpoint.Y! - !Shape.firstpoint.Y!)) * (180 / math.pi)) % 360 % 180) < 135): dir = 'W-E' else: dir = 'N-S' Then for each direction group number them in order using the first opposite ordinate to sort. ...

4

Create a copy of your road. Start editing it, select line and and split into equal length segments, I’d say approximately 50 m. Convert segments to 3D shapes: Calculate field abs( !Shape!.lastPoint.Z- !Shape!.firstPoint.Z)/ !Shape!.length*100 Result: Please note both roads shown are fictions. One of them made of contour line, guess which. I ...

3

Segmented object (aka trained) classification can be used very succesfully for this problem, but I don't know GRASS enough to tell you what capabilities it has in this area. You'd get polygons though, so you'd still have to thin them or use a mean or some other transformation. You'll get even better results if you have a near-infrared band or composite ...

3

ESRI has a collapse dual carriageway to centerline tool. You can get a cheap version for use with OSM. Otherwise you could select features and save as a new layer. Deleted selected from layer you used for export. Buffer feature within range of one side of the carriageway that includes the second lane. Merge shapefile with original, connect up any broken ...

3

You can download the data from open street map .Use the Export button on top left option to download data. Additionally if you are looking for an routing/ networking algorithm you can have a look at project OSRM which uses the above mentioned data for routing. hope it helps. good luck .

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You do not specify which GIS system you wish to implement your analyses so you could investigate the sDNA which can be run in ArcGIS, python or AutoCAD.

3

That's a known issue of QGIS 2.2 but it should be fixed in the dev version and will be in 2.4. See http://hub.qgis.org/issues/9780

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Without an Advanced level license of ArcGIS for Desktop your best alternative may be to use ArcPy and Geometry objects. Upon seeing the Comment from @Michael Miles-Stimson I looked in the ArcGIS 10.2 Online Help and found that the Polyline object has a queryPointAndDistance method which: Finds the point on the polyline nearest to the in_point and the ...

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The obvious answer is OpenStreetMap. If quality is good enough for your purpose.

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