Timbalai 1948 / RSO Borneo (m) Projected CRS used in Asia - Brunei and East Malaysia Formerly also large and medium scale topographic mapping and engineering survey.

The deeper I go into coordinate reference system (CRS) the more I start to question whether I am using the right one because accuracy is the name of the game when it concerns GIS data. Goggling here and there, I realized Malaysia itself uses 4 UTM Zone reference.

If a map was prepared using the familiar WGS84 with the Authority ID:4326, things would be simple but what happened if the required map prepared by a third party set on finer specifications, how now? If the user who receives that map was unaware that the CRS was not really WGS84 but a combination of WGS84 and UTM zone, then, the user will never get the CRS accurately configured. Hi, Pak Abbas! Very interesting post!

This was something I've wanted to discuss with you if we get to meet up when my wife and I return to Malaysia in lae September. (My wife and I finally got a Malaysia My Second Home (MM2H) visa in June!) We will be in KL through May or so of 2013 this time. One of the things I found when I was doing the 'Township GIS' project was that the GDAL utilities *which QGIS uses for projecting and re-projecting layers) is pretty useless when dealing with the RSO projections (like the Michigan GeoRef projection used by our state government here). Hence I had to find a work-around (using uDig) for converting shapefiles from GeoRef to something that QGIS could handle. This also implies that QGIS would not be able to correctly handle shapefiles that Jupem might make available to users in Malaysia. One of the things I want to do is to see if the uDig workaround (would work with files from Jupem (or from anybody else using RSO). There have been posts by Malaysians in the GDAL forums begging the folks there to do something about the RSO problem, as this makes QGIS (and other open source software that depends on GDAL utilities) useless for work involving RSO-projected files.

I don't know if the GDAL community will be able to act on this soon, because their foremost programmer has gone to work for Google, and who knows if he will have the time to devote to the GDAL tools like he used to? Anyway, I'm not an expert on map projections; my only background being a class I took when I was working on my MGIS program. But I'm interesting in the subject, especially since the RSO problem nearly derailed my Township GIS project! Keep up the wonderful posts and the good work you are doing! Howard Yamaguchi.

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I am already thankful that a software such as QGIS existed in the first place even with all its shortcoming simply because it is free and that helps to kickstart many an agency that simply cannot afford a GIS software but wants to develop its own GIS database. If QGIS with its current specs cannot deliver what one wants and someone wants something fast now, I see no other option but to cross over into proprietary GIS territory. Anonymous Nice write up. To my understanding, Coordinate Reference System (CRS, e.g. WGS84) is not the same as Spatial Reference System (SRS, e.g.

Basically, CRS is only an ingredient to make a SRS, and not the SRS of itself. That means UTM uses WGS84 to make a projection. Maybe we can put it this way: CRS = A reference ellipsoid (a 3D ellipse) we use to pinpoint ourselves from each other. The most popular ones are WGS84 and GRS80. SRS = How we project those 3D ellipse into a 2D planar, like paper/monitor screen.

There is no perfect way to make a flat surface from a 3D ellipse, so mathematical models are used to project CRS into a 2D planar. For instance, UTM system uses a secant transverse Mercator projection using WGS84. So, WGS84 data by itself is unprojected.