Identifies questions specific to streets, such as street drainage, identifying centerlines, and creating travel networks.

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2
votes
0answers
32 views

How do map providers collect/update street names in the Middle East? [closed]

Lets talk about middle east countries, which are not as fully covered as European countries and the US. How do map providers get street names, update new areas and all of these related things? Do ...
2
votes
0answers
30 views

What determines direction in “Hatches”?

I created a route layer that uses hatches to help determine addresses along a street centerline. About 90% of the time, the hatches go up from zero in the direction that the line was digitized but ...
1
vote
2answers
46 views

Split polygon based on line segment

I am trying to split a street polygon based on the segment ID of the street, giving them the same segment_ID in the attribute table of the street lines. I did not use the line feature class to derive ...
0
votes
1answer
47 views

Where to find street names for each city in US?

I'm sorry if my question is stupid but I had to ask. I'm building a database of US states, cities, streets AND their basic relations to each other. I already have state and city tables. Where can I ...
0
votes
1answer
50 views

Adjusting for road surface in Network Analyst? [closed]

I'm building a street network dataset and want to adjust the speed limit of certain segments to account for road surface (paved vs. unpaved). Are there any guidelines/rules for doing this (e.g. an ...
5
votes
2answers
49 views

Compare slopes between adjoining line segments

Using a DEM, I assigned slope values to individual segments in a street network feature class. In some areas the slope values seem suspect, such as where a highway overpasses a local road. Is there a ...
2
votes
2answers
74 views

How to simplify streets such that seperate driving tracks are reduced?

Streets in Openstreetmap have more detail than I need. For instance I do not need seperate street tracks for each driving direction, instead I just want to show the general path of the street. ...
2
votes
0answers
38 views

How to specify a polygon face toward to different lines

I have a parcel layer, a street of city layer, I want to find the parcels at the corner of two different street (mean a house with two face toward to 2 streets) I appreciate your suggestion for ...
0
votes
1answer
63 views

GPS and One-way Streets

I'd like to know how GPS can determine if a street is one-way. Does it detect one-way signs or parked car positions if any?
2
votes
1answer
35 views

Intersection Type Data

Would anyone have any input as to where I could find a table/shapefile/feature class that describes the intersection type of roads? I've looked into TIGER roads, StreetMap premium, OpenStreetMap ...
4
votes
2answers
368 views

How to group connected linestrings in PostGIS?

I have a table of streets I've selected based on a set of attributes (let's say it's speed_limit < 25). There are groups of streets that are locally contiguous; I'd like to group these sets of ...
1
vote
1answer
59 views

Can I create a polyline with one long segment and three shorter underlying segments?

We currently have a street centerline polyline feature class where the street segments correspond to our pavement management database. Each segment has a unique ID that matches a record tracking ...
13
votes
3answers
213 views

Account for bridge overpasses in a ground DEM to allow for water flow under the overpass

I have a bare earth DEM made from lidar data (A). It works well and has passed all accuracy tests. It is used in storm surge models. The problem we are having is on underpasses. I need to allow water ...
2
votes
2answers
230 views

Calculate Slope of Street Segments

Using a DEM, I need to assign slope to individual segments in a street centerline feature class. It will be used to account for increased travel time for steep slopes in a network analysis. I am ...
0
votes
1answer
40 views

Cleaning up Line Features

I'm in the process of creating some routes for which I need left and right sections. I have an original streets feature class, which I used "copy parallels" on, and came up with something like the ...
1
vote
1answer
59 views

Creating a list of unique street names from a list of address

I would like to generate a unique list of street names from a list of UK addresses. But obviously there will be a number of streets with the same name. Which is fine, but I want to distinguish ...
4
votes
1answer
120 views

How to transform a set of street-segments into city-blocks, with PostGIS2?

Theoretically is possible to obtain the polygons of city blocks (urban blocks) from streets, when streets are represented by street axis (LineStrings). The urban blocks are bounded by streets, so ...
3
votes
2answers
787 views

OSM - Extract Streets from OSM Data (With/Without Python)

I'm currently in the works of creating a pythonic way of extracting street names from an OSM dump for the Province of Quebec. Originally, I wanted to do this in Python to make it easier to integrate ...
2
votes
2answers
67 views

How to find if a lat/lon point is on a street?

Are there any services to determine whether or not a give lat/lon point is on a street? I am working on an app that uses user entered lat/lon points but it only really makes sense if its on a street. ...
2
votes
0answers
37 views

How do I get a count of all the dead end streets? [duplicate]

I'm working in ArcGis 10.1 - Advanced and I wanted to know how can I identify and get a count of the number of dead end streets in my road network?
3
votes
2answers
83 views

How to map Traffic Count Points to Streets?

I've got point data representing traffic count locations and I am trying to figure out the best way to represent them on a map.I thought about kriging to provide a continuous surface but I don't think ...
7
votes
2answers
661 views

Easiest way to create historical street maps using QGIS

I want to make some historical street maps using QGIS. I understand how to upload a historical OS map from DigiMaps to QGIS, but I want to actually 'draw' the streets myself in order to have some ...
2
votes
1answer
87 views

Merging and snapping Tiger line files

I have several adjacent (county level) TIGER road files. I want to merge them and create one contiguous file of snapped roads for the purpose of doing network analysis. Merging them is easy but ...
3
votes
5answers
359 views

Assigning centerline address ranges

I've been given the task of assigning address ranges to a centerline feature class. I have all the data and I am just going street by street. My question: When assigning ranges, should I just enter ...
3
votes
0answers
367 views

Report Designer (ArcGIS 10.1) - Using Element Properties

I've finally got a table generated that will work for a street index and I'm attempting to use the ‘Create Report’ tool with ArcGIS 10.1 to generate what I need for a map. Essentially, I have it setup ...
3
votes
2answers
370 views

is there a public street database that I can do SQL queries on?

Sorry if this isn't strictly a GIS question. I want to know if there's a public database of US streets and US States that I can simply connect to (e.g. JDBC) and run SQL queries. For example, I want ...
13
votes
6answers
7k views

Methodology for creating accurate drainage networks (and catchments) from high resolution LiDAR DEM?

This is not the first time I've stumbled over this issue; it seems that I am unable to generate a correct drainage network model and the resulting catchments from full resolution (1m cells) LiDAR ...