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Thanks very much for your reply.<br />
<br />
The company who supplied the data did say that they have reformatted it so that makes a lot of sense!
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Thanks very much for your reply.

The company who supplied the data did say that they have reformatted it so that makes a lot of sense!

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Hello<br />
<br />
I don't know if anyone here will be able to help me but i am not getting anywhere with anybody else<br />
<br />
I have recently bought some navteq streets level vector data and I am having trouble understanding some of the attributes. I have tried contacting the people who supplied the data but they don't know anything.<br />
<br />
<br />
Take for example a_roads_polyline<br />
<br />
1. Many of the rows in the attribute file do not have a name. How can a road be an A road if it does not have a name? It must be named Axxx or else it can’t be an A road.<br />
<br />
2. Many roads have multiple entries. For example, there are many rows for the A10. Why are there so many different entries for a single road? I thought there might be one entry for a road for every different postcode it crosses. Is this the reason? <br />
<br />
3. The same questions as above for motorways. How can a motorway not have a name? Why are there so many entries for each motorway? There seems to be one entry for each motorway junction and more besides. Any ideas?<br />
<br />
Thanks very much for any help you can give<br />
andrea<br />
<br />

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Hello

I don't know if anyone here will be able to help me but i am not getting anywhere with anybody else

I have recently bought some navteq streets level vector data and I am having trouble understanding some of the attributes. I have tried contacting the people who supplied the data but they don't know anything.


Take for example a_roads_polyline

1. Many of the rows in the attribute file do not have a name. How can a road be an A road if it does not have a name? It must be named Axxx or else it can’t be an A road.

2. Many roads have multiple entries. For example, there are many rows for the A10. Why are there so many different entries for a single road? I thought there might be one entry for a road for every different postcode it crosses. Is this the reason? 

3. The same questions as above for motorways. How can a motorway not have a name? Why are there so many entries for each motorway? There seems to be one entry for each motorway junction and more besides. Any ideas?

Thanks very much for any help you can give
andrea



problems understanding attributes in vector map data

The Global Positioning System (GPS) is a space-based global navigation satellite system (GNSS) that provides reliable location and time information in all weather and at all times and anywhere on or near the Earth when and where there is an unobstructed line of sight to four or more GPS satellites. A geographic information system (GIS) or geospatial information system is any system that captures, stores, analyzes, manages, and presents data that are linked to location(s). In the simplest terms, GIS is the merging of cartography, statistical analysis, and database technology.