Reprojecting Vector Data in Saga: UTM to WGS84

Up 2.1 Preliminaries 2.2 Project Area 2.3 Project Map 2.4 Graticules & Frames ___2.4.1 Frames Check 2.5 Grid Templates ___2.5.1 Grid Check 2.6 GEBCO Contours 2.7 Sediment Thickness 2.8 Boundaries & Coast 2.9 Marine Regions 2.10 Text Spreadsheet 2.11 Number Spreadsheet 2.12 Cutting a Shape ___2.12.1 Cutting Check 2.13 0-360 System 2.15 Shape from XYs 2.18 Navy Waves 2.19 IDV & THREDDS 2.20 Land Stations 2.21 HDF Chloro/Sal 2.22 HDF SST 2.24 Coastal Survey 2.25 NetCDF with NaN 2.26 Google Digitizing 2.27 UTM->,WGS84 2.29 Nav Charts 2.30 Argo MLDs 2.31 SST/Ice Climate 2.32 EU Wave Climate 2.33 GSHHG Vectors 2.34 GlobWave Grids 2.35 MGD77 Surveys 2.36 ColorWeb T/Chl/S 2.37 Named Places/Features 2.38 Giovanni Chlorophyll 2.39 Set Properties roviding instruction for managing, converting, analyzing and displaying oceanographic station data, marine meteorological data, GIS-compatible marine and coastal data or model simulations, and mapped remote sensing imagery To 're-project' a mapping file in Saga, we will first assign the correct, current projection to it (in the first step) and then we will direct Saga to display it in a desired second projection (in the second step). The actual coordinates for the points will remain unchanged, but the auxiliary files (*.MSHP and *.PRJ) contain the re-projection parameters. Most true GIS programs will recognize and apply the reprojection via the use of these files. 1. Select FILE >, TABLE >, LOAD to load into Saga the table of depth measurements. You can see from the displayed values that they cannot be latitude or longitude. 3. Select TOOLS >, SHAPES-POINTS >, CONVERT TABLE TO POINTS. Make these choices and click OK to convert the table to a point shape. 4. Here you can see the points displayed on a Saga map. The scale figure below shows that very unexpected units are available. 5. The module has improved the shape with the addition of projection information, but you must capture this in the files. Select the shape, and use SAVE AS to save it. 6. Keep the same location and table name, so now you have these 5 shape files (DBF, MSHP, PRJ, SHP, SHX). The projection information is in the PRJ file. 10. To avoid identification problems, you should rename the new shape to reflect the reprojection, as you see here. The original projection name can be retained for further clarity. 12. But if you map the new point shape it will plot with expected longitude and latitude values for the WGS system, as you see here. The land map is part of World Borders, and we know that it is WGS84. 13. Inspection of the resulting 5 files, indicates that the MSHP and the PRJ files together are needed to plot these data correctly in WGS84 coordinates. The exercises, notes and graphics in this website are copyrighted, and may not be copied or abstracted in any way, without my explicit permission (in writing). Making one copy for your personal use is allowed. Please report any copyright infringement to me. Murray Brown m.brown.nsb <,at>, Source.

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