Published March 11th, 2007
in Geomatics and Project.
The network might be modelled better if the lines, or routes were the main method of input. This might allow better modelling of branches, which mainly occur outside of Z1 (exception: Northern Line). Modelling service routes based on start:destination would also allow for modelling loops such as the Central line’s Hainault loop (Z4/5 twds Epping).
For example, treating each service run on the Central line as a line in itself:
- West Ruislip:Epping
- West Ruislip:Woodford via Hainault
- Ealing Broadway:Epping
- Ealing Broadway:Woodford via Hainault
- same services in reverse…
Published March 11th, 2007
in Geomatics and Project.
Bank, Monument, Paddington, Edgeware Road, Euston
How to model theses stations in a database? How many connections does each one have? Should DLR be included and if so, how is Tower Hill/Tower Gateway modelled?
e.g. Inc. DLR: Can’t go between Tower Gateway and Bank on DLR within Z1. But they are connected.
Problem: to model multiple lines as an attribute of a station. e.g.:
Goodge St. = 0 junctions, lines = 1, line id = Northern
Tottenham Ct. Rd = 1 junction, lines = 2, line id = ??? Northern and Central
How to select stations based on line attribute?
Published March 11th, 2007
in Geomatics and Project.
Alternative representations of networks possible with these two programs, designed originally for mapping and analysing social networks. Trial periods available. Will look into using these to represent LU. More simplistic, quicker than geodatabase.
Modelling transport network as a social network.
Data entry continuing on Zone 1 map.
References database started in Reference Manager.
Links: NetDraw, Ucinet
Published March 10th, 2007
in Geomatics and Project.
A personal geodatabase has been chosen to organise data. This is a proprietary ArcGIS format, and will restrict processing to ArcGIS products. There is a Network Analyst extension for the program.
TAB files (MapInfo) are easy to edit. Conversion between Arc and MI can be done using shapefiles, ArcCatalog and MI Universal Translator. Spatial references are really important for spatial integrity, and a must for the geodatabase, which stores this info intenally.
Problems have been encountered with forcing data into a geodatabase format, but this has been achieved.
During the conversion process (TAB - .shp), it looks like field types have not been converted properly. They aren’t editable in ArcCatalog either, but the .mdb can be edited in MS Access, and the field types changed as desired. Bear in mind that data loss can occurr using this method (e.g. converting a double to a short integer) but an audit of the field column data values should be sufficient (e.g. making sure that ID values are integers, so conversion from double should not be problematic).
Task: build geodatabase containing all stations and lines in Zone 1.
Flow: create data in TAB files, convert to .shp, import to geoDB.
Check: projection and datums, data, field types.
Published March 10th, 2007
in Geomatics and Project.
This blog has now been converted to hold personal notes on progress through the project. For this reason, posts may be Private or Protected.
See: About
Published November 6th, 2006
in Geomatics.
The link takes you to where all the photos are kept. To save the photos, click on one to enlarge, then highlight, right-click and save the photo that way. There is probably a more simple way, but this way works.
Published November 6th, 2006
in Geomatics.
I’ve uploaded the panoramics, textures and scenes using DropShots… I’ll start off with a practice one first… just in case I mess it up!
Photo Sharing - Upload Video - Video Sharing - Share Photos
Published November 5th, 2006
in Geomatics.
I havn’t been able to upload the photos from the visit to Stratford on the 2nd Nov 2006… Its quite a large file. Even the smaller files cannot be uploaded…
Published November 3rd, 2006
in Geomatics.
Group members can register using this link: Register to upload content.
After approval, you can create posts and upload files.
You may wish to password protect a post with content intended only for group members.
- Craig
Published October 30th, 2006
in Geomatics.
The following is an example of a .kml file, posted to see how well it distributes accross a blog. The .kml opens in Google Earth. It has had to be zipped, as .kml files cannot be uploaded to WordPress, so you will need to extract the files first. Here is a preview image…
Download ‘Team B - area covered’
