> I've been trying to get updated data for my Garmin eMap GPS for the last 6 months, >as the stuff that Garmin were able to get suffers from a data translation problem - >if the data is in (for example) AUS1994 format, and they converted it to NMEA or >GARMIN format for the GPS, it shows points as being up to 500 metres out. > > For example, taking a reading from Richmond railway station with a 5 metre >resolution (and access to 8 satellites) should be fairly accurate, yet the map says >that I am 435 metres away from the station. > > Same applies for my offivce in the CBD - a reading (handheld, from the roof with 6 >satellites and 10metre resolution) tells me that I work in Cockle Bay. > > To get the same accuracy as, for example, the USA enjoys (wether it be mapping CDs, >GPS data or... *gasp*... M$ Roadmap) would cost you thousands of dollars, as it's not >"public domain" in this country, whereas almost every other country on this planet >that uses this makes it available either free or for a VERY minimal fee.
Is it possible that this may be a projection, or datum point problem? The earth is spherical-ish, and projecting this sphere onto 2D maps has all sorts of problems. Jamie -- SLUG - Sydney Linux User Group Mailing List - http://slug.org.au/ More Info: http://lists.slug.org.au/listinfo/slug
