Batch Convert Coordinates using the Koordinat2 app

 

A batch coordinates conversion tool has been added to the Koordinat2 web app (https://dominoc925-pages.appspot.com/webapp/koordinat2/default.html) to perform bulk coordinates transformation between coordinate systems. 

This post shows how to use the Batch Coordinates Converter.

Launch the Batch Coordinates Converter

1. Use a browser to open the Koordinat2 web app url (https://dominoc925-pages.appspot.com/webapp/koordinat2/default.html).
   
   
   
   
   
2. Tap the hamburger icon on the top left.
   
   The Navigation drawer appears.
   
   
   
   
3. Tap the Batch Coordinates Converter list item.
   
   The Batch Coordinates Converter screen appears.
   
   
   

Define the Primary Coordinate System

1. In the Primary Coordinates card, click the gear icon.
   
   The Primary coordinates selection appears.
   
   
   
2. Select a coordinate system from the list or search for it by clicking the Search icon and typing in the name of the coordinate system e.g. MGRS.
   
   MGRS is selected as the primary coordinate system.
   
   

Define the Secondary Coordinate System

1. In the Secondary Coordinates card, click the gear icon.
   
   The Secondary Coordinates screen appears.
   
   
   
2. Select a coordinate system from the list or search for it by clicking the Search icon and typing in the name of the coordinate system e.g. WGS 84.
   
   WGS 84 geographic is selected as the secondary coordinate system.
   
   

Enter the coordinates and perform the conversion

1. In the Primary Coordinates text field, type or paste in the coordinates to convert.
   
   
   
   
2. Click the right arrow to convert from primary to secondary coordinate system.
   
   The coordinates are converted.
   

   

Convert East North Up (ENU) to/from longitude,latitude and other various coordinate systems

 

The Koordinat2 web app (https://dominoc925-pages.appspot.com/webapp/koordinat2/default.html) has been upgraded to perform coordinate transformation between local coordinate system East North Up (ENU) and many other coordinate systems including MGRS, North East Down, ECEF, geographic longitude/latitude, etc. 

This post shows the typical steps to perform the local ENU conversion to other coordinate systems.

Define the ENU local origin 

The local origin should be as near as possible to the area of interest. If it is too far away, the calculation rounding errors would result in erroneous converted coordinates.

1. Use a browser to open the Koordinat2 web app url (https://dominoc925-pages.appspot.com/webapp/koordinat2/default.html).
   
   The Koordinat2 web app home page appears.
   
   
   
2. Click the hamburger menu icon on the top left.
   
   The Navigation drawer opens.
   
   
   
   
3. Click the Settings item.
   
   The Settings dialog appears.
   
   
   
   
   
4. Choose the item North East Down/East North Up reference origin.
   
   The NED/ENU Reference Origin appears.
   
   
   
   
5. In the dialog, enter the reference origin Longitude, Latitude, and Altitude. Click Save.
   
   The Reference Origin is saved.
   
   

Define ENU as the Primary coordinates (input)

1. In the Primary coordinates card, click the gear icon.
   
   The Primary coordinates selection appears.
   
   
   
   
   
2. Select East North Up from the list or search for it by clicking the Search icon and typing in ENU.
   
   
   
   

Define the Secondary coordinates (output)

1. In the Secondary coordinates card, click the gear icon.
   
   The Secondary coordinates selection appears.
   
   
   
   
   
   
2. Select a desired coordinate system e.g. MGRS from the list or search for it by clicking the Search icon and typing in  MGRS.
   
   
   
   

Enter ENU coordinates

1. In the Primary coordinates card, type in the East, North and Up values.
   
   The ENU values are converted to the secondary coordinates. And a marker appears on the map.
   
   
   
   
   

QGIS - Finding location by coordinates

If you need to find specific locations by entering coordinates directly on a map, QGIS offers a handy tool for this purpose. I stumbled upon this feature by chance, and it’s incredibly useful. On the status bar at the bottom of the QGIS interface, there is a field where you can input the desired map coordinates. Here’s how you can use it:

1. Open QGIS: Start by launching the QGIS application.
   
   
   
   
   
   
2. Click on the Status Bar Field: Locate the status bar at the bottom left of the screen and click on the input field. A dialog box will pop up.
   
   
   
   
   
   
   
3. Enter Coordinates:  Enter the coordinates you want to locate, for example, 3.0584N, 101.566E.
   
   
   
   
   
   
4. Press ENTER: After typing in the coordinates, hit the ENTER key.
   
   
   

A red circle will blink a few times on the map, indicating the location you specified. This simple yet powerful tool makes it easy to pinpoint exact locations on your map with just a few clicks.

Convert Earth Centered Earth Fixed to/from other coordinate systems with this web app Koordinat2

According to Wikipedia https://en.wikipedia.org/wiki/Earth-centered%2C_Earth-fixed_coordinate_system: in today's modern age of navigation and spatial referencing, there's a key player that often goes unnoticed: the Earth-centered, Earth-fixed coordinate system, more commonly known as ECEF. This sophisticated system, akin to a cosmic GPS, allows us to pinpoint locations with incredible precision. Picture this: a cartesian grid that not only encompasses the Earth's surface but also delves deep into its core, reaches high into the atmosphere, and extends into the surrounding outer space. Through X, Y, and Z measurements from the Earth's center of mass, ECEF opens up a world of possibilities for mapping and exploration.

The WebApp Koordinat2 here on https://dominoc925-pages.appspot.com/webapp/koordinat2/default.html has been enhanced to include conversions between ECEF and various other geo-coordinate systems.  

The following shows how to use convert ECEF to/fro longitude, latitude, altitude WGS84.

Define ECEF as the Primary coordinates (input)

1. Open a browser to the Koordinat2 web app url https://dominoc925-pages.appspot.com/webapp/koordinat2/default.html.
   
   The Koordinat2 web app home page is displayed.
   
   
   
   
   
2. In the Primary coordinates input card, click the gear icon.
   
   The Primary coordinates selection dialog box appears with a list of favorite coordinate systems.
   
   
   
   
   
   
3. Click the ECEF item from the favorite list, or search for it by clicking the Search icon and typing in ECEF.
   
   
   
   
   
   
   

Define WGS 84 as the Secondary coordinates (output)

1. In the Secondary coordinates card, click the gear icon.
   
   The Secondary coordinates favorites list is displayed.
   
   
   
2. Click on the WGS 84 item from the favorites list, or click the Search icon and typing in WGS 84 to search for it.
   
   
   
   
   
   

Enter ECEF coordinates

1. In the Primary coordinates card, type in the X, Y, and Z ECEF values.
   
   The ECEF values are converted to the secondary WGS 84 coordinates. A marker appears on the map.
   
   
   
   
   
   

Convert North East Down (NED) to/from longitude,latitude and other various coordinate systems

The Koordinat2 web app (https://dominoc925-pages.appspot.com/webapp/koordinat2/default.html) has been upgraded to perform coordinate transformation between local coordinate system North East Down (NED) and many other coordinate systems including MGRS, geographic longitude/latitude, etc. 

This post shows the typical steps to perform the local NED conversion to other coordinate systems.

Define the NED local origin 

The local origin should be as near as possible to the area of interest. If it is too far away, the calculation rounding errors would result in erroneous converted coordinates.

1. Use a browser to open the Koordinat2 web app url (https://dominoc925-pages.appspot.com/webapp/koordinat2/default.html).
   
   The Koordinat2 web app home page appears.
   
   
   
2. Click the hamburger menu icon on the top left.
   
   The Navigation drawer opens.
   
   
   
   
3. Click the Settings item.
   
   The Settings dialog appears.
   
   
   
4. Choose the item North East Down reference origin.
   
   The NED Reference Origin appears.
   
   
   
5. In the dialog, enter the reference origin Longitude, Latitude, and Altitude. Click Save.
   
   The Reference Origin is saved.
   
   

Define NED as the Primary coordinates (input)

1. In the Primary coordinates card, click the gear icon.
   
   The Primary coordinates selection appears.
   
   
   
   
   
2. Select North East Down from the list or search for it by clicking the Search icon and typing in NED.
   
   
   

Define the Secondary coordinates (output)

1. In the Secondary coordinates card, click the gear icon.
   
   The Secondary coordinates selection appears.
   
   
   
   
   
   
2. Select a desired coordinate system e.g. WGS 84 from the list or search for it by clicking the Search icon and typing in  WGS 84.
   
   
   

Enter NED coordinates

1. In the Primary coordinates card, type in the North, East, and Down values.
   
   The NED values are converted to the secondary coordinates. And a marker appears on the map.
   
   
   
   

Using Koordinat2 webapp to convert between SVY21 and geographical coordinates

This is a follow up to the original post https://dominoc925.blogspot.com/2021/02/koordinat2-webapp-for-geo-coordinates.html, which describes a generic coordinate conversion steps. This post shows how to specifically use the Koordinat2 webapp https://dominoc925-pages.appspot.com/webapp/koordinat2/default.html to convert from WGS 84 latitude, longitude coordinates to SVY21 projected easting and northing coordinates, and vice versa.

Select the WGS 84 lat, lon as the source coordinate system

1. Using a modern browser, open the url https://dominoc925-pages.appspot.com/webapp/koordinat2/default.html.
   
   The Koordinat2 web app appears in the browser.
   
   
   
   
   
2. In the Input Coordinates card, click the gears icon labeled 1 in the screen above.
   
   The Select Source Coordinate System dialog appears.
   
   
   
3. In the Search field, type in a partial string for the WGS84 latitude, longitude system, e.g. "4326" or "WGS 84".
   
   A list of matches appear.
   
   
   
   
   
   
4. Click the WGS 84 list item.
   
   The WGS 84 geographic coordinate system is selected.

Select the destination SVY21 coordinate system

1. In the Output Coordinates card, click the gear icon (labeled 2 in the screen below).
   
   
   
   
    
   
   The Select Destination Coordinate System dialog appears.
   
   
   
2.  In the Search field, type in a partial string for SVY21, e.g. "3414" or "SVY21".
   
   A list of matching coordinate systems appears.
   
   
   
3. Click the SVY21 / Singapore TM list item.
   
   The destination coordinate system is selected.
   
   
   

Performing coordinate conversions from latitude, longitude to SVY21

1. In the Input Coordinates card, enter the Longitude and Latitude values.
   
   The Longitude/Latitude coordinates are dynamically converted and displayed in the Output Coordinates card.
   
   
2. Optional. If you wish to see the location of the coordinates on the map, click the marker icon as shown below.
   
   
   
   
   
   The location is marked by a marker on the map.
   
   
   
   
   

Performing coordinate conversion from SVY21 to WGS84 latitude, longitude

If you wish to perform the reverse conversion, simply repeat the previous steps but reverse the coordinate system selections.

 

 

Koordinat2 WebApp for geo-coordinates conversion and display

Koordinat2 WebApp (https://dominoc925-pages.appspot.com/webapp/koordinat2/default.html) was developed using ReactJS and WebAssembly for converting geo-coordinates and showing them on a map. The WebApp uses Proj4 in the backend for performing the projection conversion and datum conversion; hence it supports over a thousand coordinate reference systems. 

Using the Koordinat2 WebApp is easy. The following shows what can be done with the WebApp.

Opening the WebApp

1. Using a modern browser, open up the the Koordinat2 WebApp at this url https://dominoc925-pages.appspot.com/webapp/koordinat2/default.html
   
   The WebApp page is displayed.
   
   
   

Choosing Coordinate Systems

1. To define the primary input coordinate system, click the gear icon in the Input Coordinates panel.
   
   The Select Source Coordinate System dialog appears.
   
   
   
2. In the Search field, type in a EPSG code e.g. 3414 for SVY21. Or type in part of a coordinate system name, e.g. Borneo.
   
   One or more entries are listed.
   
   
   
3. Click on a listed entry, e.g. Timbalai 1948 / RSO Borneo (m).
   
   The selected coordinate system is chosen.
   
   
   
4. To define the secondary or output coordinate system, click the gear icon in the Output Coordinates panel.
   
   
   
5. Choose the Output coordinate system e.g. EPSG 4326 using similar procedure as the previous steps 3 to 4.
   

Converting Coordinates

1. To convert coordinates in the Input Coordinate system, type in the Easting and Northing (or Latitude and Longitude) values in the corresponding entry fields.
   
   The converted coordinates are displayed immediately in the Output Coordinates Longitude and Latitude fields (or Easting and Northing fields).
   
   A corresponding marker is also created on the Map pointing to the location of the coordinate.
   
   
   
2. Optional. Clicking on the marker will pop up a moveable Information box.
   
   

 

Displaying Coordinates of Map Locations

1. To display coordinates of locations on the map, simply click the map location with the mouse.
   
   A marker is placed at the clicked location.
   
   The clicked location coordinates are displayed in the Input Coordinates and Output Coordinates panels.
    

  Displaying a Grid

1. On the toolbar on the top right, click the Grid icon.
   
   The Select Grid Settings dialog box appears.
   
   
   
2. Optional. Click the Line color field to choose a grid color.
   
   
3. In the Grid type field, choose the grid type to display e.g. UTM or Geographic.
   
   
4. Click Okay.
   
   The selected grid is displayed on the map.
   

Selecting a Base Layer

1. On the tool bar on the top right, click the Layer icon.
   
   The Select Base Layer dialog box appears.
   
    
2.  Choose a layer to display, e.g. Open Street Map Landscape.
   
   The base layer changes to the selected layer.
   

Show Myanmar Datum 2000 coordinates with this Mapplet

Myanmar uses a Universe Transverse Mercator projection at Zone 46 (with a Myanmar Datum 2000). For convenience, this mapplet has been written to display and locate Myanmar easting, northing coordinates on Google Maps. To show the coordinates of a location on the map, just click a point on the map, as shown in the screenshot below. A marker Info window will pop up displaying the Myanmar Datum 2000 easting and northing coordinates, as well as the Geographic latitude, and longitude values.

Try out this mapplet at this location https://dominoc925-pages.appspot.com/mapplets/cs_myanmar2000.html