Coordinate Converter Borneo Rsop
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I am using QGIS 1.9.0 on Linux Mint; and I am new to (Q)GIS
Enter the GPS coordinate and the desired datum in one of the columns above 2. Select the hemisphere, if you want to convert Lat/Long values into UTM 3. In case of datum transformation, select the desired datum in the target column(s) 4. Press the convert button. Coordinates in the previous converter were entered by default into separate boxes for each coordinate. This has been removed and instead coordinates are entered by default into a free format text box. Accessing the previous version of the converter. The previous version of the online coordinate conversion tool will be available until the end of.
I have three layers (two shapefiles, one OpenLayers layer [Bing Maps]) that I am trying to line up located in peninsular Malaysia.
Shapefile_1 is a sub-district border (WGS84; EPSG:4326)Shapefile_2 is river system within the sub-district (GDM2000 Peninsula RSO; EPSG:3375)OpenLayers (set as the ProjectLayer CRS; WGS84 Pseudo Mercator; EPSG:3857)
When importing the layers in QGIS, Shapefile_1 is close to the borders of the sub-district shown in the OpenLayers layer -- but clearly not matched.
Shapefile_2 is incorrectly located hundreds of kilometres north east off the coast.
When the same layers, with the (apparently) same CRS information are displayed in ArcGIS, they line up correctly.
Any insights would be greatly appreciated.
nmtoken3 Answers
I'm afraid you are lost with your Malaysian data with QGIS and any other software depending on GDAL and proj. Here is some reading:
The difficult thing is the omerc projection, which does not use a simple meridian as origin, but a line with an angle to its prime meridian. There are two different versions on how to rotate the data to the line, and rotate back in the end to have north up. Both are defined in proj by a +no_uoff parameter. Unfortunately, this has been lost somewhere between proj, GDAL, ogr2ogr and QGIS (see the last ticket).
EDIT
Still something is working, but NOT inside QGIS:
I installed the latest dev version of GDAL from gisinternals, and reprojected the shapefile with the following :
I first tried with WGS84, but got the offset you mentioned. EPSG:4245 is an older datum used in Malaysia. This is what i got, against Google Physical background:
AndreJAndreJCoordinate Converter Borneo Rsop System
I corresponded with Hilmy Hashim about the question I raised. He was the author of one of the links Andre Joost cited. Hilmy had written about the issue and the answer here.
His reverse engineered, custom CRC was:
+proj=omerc +lat_0=4 +lonc=102.25 +alpha=323.013286728 +gamma=323.07483685 +k=0.99984 +x_0=472830.426 +y_0=442454.099 +ellps=GRS80 +units=m +no_defs
The results are better than when I started, but still off. The river from one of my shapefiles is in red, and offset from the google layer.
From trials, the following proj4 seems working.'+proj=omerc +lat_0=0 +lonc=105.236274066667 +alpha=323.0257964666666 +gamma=-36.86989764584402 +k_0=0.99984 +x_0=804671 +y_0=0 +ellps=GRS80 +units=m +no_defs'
If you happen to try it, may i know if it works?
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An MGRS coordinate is comprised a single string of numbers and letters instead of two separate numbers for latitude and longitude. Google Maps, however, uses only the traditional, two-number coordinate system. In order to map MGRS coordinates, you have to first use one of a number of free online tools to convert the MGRS to traditional format. You can then automatically map them using a spreadsheet program.
Converting MGRS to Coordinates
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The best way to convert your MGRS is to use an online converter. Many options are available (see Resources for a few examples), and all work generally in the same way. First, copy your MGRS coordinate into the area marked 'location' and then click the buttons marked 'convert' or 'calculate.'
Preparing the Coordinates
Once you have the converted coordinates, open a spreadsheet program. Create three columns, titled something like 'Name,' 'Lat' and 'Long.' In the name column, type a name to identify the location information -- a date, for example, if the data relates to the time a particular event occurred. Then return to your website and copy the latitude and longitude conversions, minus any characters besides the numbers, negative sign and decimal point, into the corresponding columns. Microsoft Excel is a common spreadsheet program, but free programs are available from Google Drive and Apache OpenOffice (see Resources).
Import the Data
Once you've created the spreadsheet, save it, open a browser and navigate to the Google Maps Engine (see Resources). Open a new map and click 'Import' from the Layers toolbar. Upload your spreadsheet and, when prompted, select the latitude and longitude columns to identify the location and the 'Name' column to give each place a name. After clicking 'Finish,' the MGRS points should all appear on the Google map.