Position, Position, Position

Transcription

1 Glenn Coianiz Exploris Pty Ltd Position, Position, Position

2 A Brief History BC navigators lats (easy 0-90 using sun) longs (not so easy dead reckoning) relationship between time and longitude Various attempts Vespucci, Galileo, Halley Celatone, astrolabe Late 1700s Board of Longitude Maskelyne - lunar distance tables Harrison - accurate clock

3 A Brief History Early 1960s cold war missile guidance Early 1980s US GPS satellites Today US, Russia (GLONASS), EU (Galileo), PRC (Compass), India (IRNSS), Japan (QZSS) DGPS

4 No so straightforward Various datums - horizontal and vertical Geographic vs projected WGS84 - most wisely-used datum Australia AGD66, AGD84 and GDA94 Local grids

5 Universal Transverse Mercator

6

7 Projected Grids Zones GDA94, AGD66 & AGD84 Zone 56

8 ,967,500 mn mn 6,965,000 mn mn 6,962,500 mn mn 6,960,000 mn mn 6,957,500 mn mn 6,955,000 mn mn 6,952,500 mn mn 6,950,000 mn mn Projected Grids GDA94, AGD66 6,955,000 mn mn 6,957,500 mn mn 6,960,000 mn mn 6,962,500 mn mn 6,965,000 mn mn 6,967,500 mn m 492,500 me me 495,000 me me 497,500 me me 500,000 me me 502,500 me me 505,000 me me 507,500 me me 510,000 me m 6,952,500 mn mn 6,950,000 mn mn 492,500 me me 495,000 me me 497,500 me me 500,000 me me 502,500 me me 505,000 me me 507,500 me me 510,000 me m

9 Variation in Coordinates Brisbane QLD Lat/Long GDA Lat/Long WGS Lat/Long AGD Lat/Long AGD GDA94 MGA Zone WGS84 Zone 56S AGD66 AMG Zone AGD84 AMG Zone = ~100m = ~200m

10 APPLICATIONS MI/D MM

11 MapInfo/Discover 2D (3D with add-on) Coordinate space Understands relationship Multiple systems per layer Converts on fly Local grids 2 pts/ S-R-S

12 Micromine 3D Operates in XYZ space Only projected coordinates Metres or feet all 3 directions Data in same system Convert but not on the fly Local grids 2 pts

13 Historical data No located tabular data Hand drawn maps, scanned Local grids AGD66 but some AGD84

14 Digitising Registration outermost, check RMS MM square MI/D + rubbersheeting Errors on errors

15 THINGS I CURRENTLY FIND HELPFUL

16 MI/D Projections MAPINFOW.PRJ (used in MapInfo menus) C:\Program Files (x86)\mapinfo\professional ENCOM.PRJ (used in Discover menus like Scaled Output) C:\Users\User\AppData\Roaming\Encom\Common\Projections DISCOVER.PRJ (contains your Discover favourites) C:\Users\User\AppData\Roaming\Encom\Discover\Config Local_Grids.PRJ "--- Local Grids --- CHGrid", 3008, 116,7, 147, 0, , , , 7, , , , , , , , , , CGGrid", 3008, 116,7, 147, 0, , , , 7, , , , , , , , , , MM fewer predefined projections Must load for each project Local grids stored as formsets

17 Master state-wide datasets coord system grouped Coordinate system in filename QLD_MainRoads_ M55.tab Project based in project folders MI folder - TABs, Grids, Workspaces

18 Workspace name in layout small print (5pt) and light grey Filename reverse date - page size - scale QLD Tenements A0P 2M.pdf Rename = Move needs a different filename eg Autogrid.tab Grid250K.tab

19 Windows 260 character limit including drive letter and \ and : important for backups/copying D:\This is a very long folder name that is to be used for a test\and this is a very long subfolder name that will add lots of characters to the filename\and this is another very long subfolder name so that I get the total over the Windows limit\brisbane1.xlsx

20 Thank you Questions?