by Ben Madin | 31 Oct, 2017 | Database, GIS, PostGIS, PostgreSQL, SQL
Australian postcodes are not reliable nor good indicators of areas, but sometimes, in the absence of any other spatial identifiers, we tend to resort to using them. As we only had a list of centroids for each postcode, to better assess the data we need to create...
by Ben Madin | 20 Oct, 2017 | GIS
Just a quick use case, we required a circle symbol in Mapserver, but our current circles were based on a single point, giving us poor legend outputs (i.e. a . instead of a o ) Mapserver vector symbols are defined using a cartesian coordinates system (no surprises...
by Angus Cameron | 24 Apr, 2016 | GIS, PostgreSQL, SQL
Seaway distance, or the shortest route between two points via water, is an important measure of risk for disease spread between aquaculture establishments. Salmon aquaculture, for example, is usually located in complex fjords, which means that there are numerous...
by Angus Cameron | 15 Apr, 2016 | GIS
In epidemiology, analysis of data by space (mapping) and by time (e.g. epidemic curves) are seen as essential tools for understanding disease dynamics and causal factors. However, temporo-spatial visualisation has been less commonly used because of the complexity of...
