QGis - New Projection Settings » History » Version 1
Giulio Di Anastasio, 06/05/2021 15:06
| 1 | 1 | Giulio Di Anastasio | h1. QGis - New Projection Settings |
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| 2 | 1 | Giulio Di Anastasio | |
| 3 | 1 | Giulio Di Anastasio | h2. How to create a new projection in QGis |
| 4 | 1 | Giulio Di Anastasio | |
| 5 | 1 | Giulio Di Anastasio | To create a new projection in QGis, go to menu "Settings", and click on "Custom Projections". |
| 6 | 1 | Giulio Di Anastasio | A pop-up window appears with a list of all projections defined in QGis projects used by the user so far. |
| 7 | 1 | Giulio Di Anastasio | Click on the green "+" sign on the right top part of the window to create a new projection. |
| 8 | 1 | Giulio Di Anastasio | In the "Name" box, type "TM CSRAUSPOS SF1" (which means TM = Transverse Mercator projection; CSRAUSPOS = theparameters for this projection are derived from the processing of DGPS raw data by AUSPOS - Online GPS Processing Service - https://www.ga.gov.au/scientific-topics/positioning-navigation/geodesy/auspos; SF1 = Scale Factor is 1). |
| 9 | 1 | Giulio Di Anastasio | In the "Format" dropdown list, select "Proj String (legacy - Not Recommended)" |
| 10 | 1 | Giulio Di Anastasio | In the "Parameters" box, paste the following "+proj=tmerc +lat_0=12.01605433+lon_0=79.80998934 +k=1 +x_0=370455.630 +y_0=1328608.994 +ellps=WGS84+towgs84=0,0,0,0,0,0,0 +units=m +no_defs". |
| 11 | 1 | Giulio Di Anastasio | |
| 12 | 1 | Giulio Di Anastasio | Finally, click on OK. |
| 13 | 1 | Giulio Di Anastasio | |
| 14 | 1 | Giulio Di Anastasio | In a more explicit way, the parameters mean the following: |
| 15 | 1 | Giulio Di Anastasio | Map Projection: TransverseMercator (TM) |
| 16 | 1 | Giulio Di Anastasio | False Easting: 370455.6300 |
| 17 | 1 | Giulio Di Anastasio | False Northing: 1328608.9940 |
| 18 | 1 | Giulio Di Anastasio | Latitude of Origin: 12°00'57.79560" (DMS) 12.01605433 (DD) |
| 19 | 1 | Giulio Di Anastasio | Central Meridian: 79°48'35.96164" (DMS) 79.80998934 (DD) |
| 20 | 1 | Giulio Di Anastasio | Scale Factor: 1.00000000 |
| 21 | 1 | Giulio Di Anastasio | Zone Width: 6.0° |