Coordinate Capturing

8/13/2019 Coordinate Capturing

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COORDINATE CAPTURING

Start ArcMAP and select new project from the window. We will use this project to

georeference map and digitize the map data. For georeferencing it is important to define

the projection ahead of time. For this task, the projection used is MRSO.

ViewData Frame PropertiesCoordinate System and navigate to the Projected

coordinate systems, next choose National Grids Malaysia and Singapore then select the

appropriate zone which is Kertau RSO Malaya (meter)

A: Soil map of Peninsular Malaysia

B: Geology map of Peninsular Malaysia


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For Soil Map

Press the yellow add databutton to bring in the scanned field map in JPG file. Right now it

is unprojected. If we hover over the file WE will see that the coordinates are not in

appropriate MRSO. These are actually units from the scanner or computer.

Do the simple editing to the image by adding intersection line of x and y coordinates.

X = 720000m

Y = 750000m

X = 190000m

Y = 140000m

X = 720000m

Y = 140000m

X = 190000m

Y = 750000m


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For Geology Map

The scanned map is provided by the degree minute coordinates which is not MRSO. There

are a few methods in coordinates capturing. For this task, our group has chosen to use

Google Earth in order to find the coordinates. The projection at the Google Earth need to be

set first as degrees, minutes, second. ToolsOptions

First is identifying the parts to place 4 control points. The most efficient and best place to

choose the control point is at the corner parts or intersection parts. Record the coordinates

each of the control points.


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Point 2

Point 1

Point 3

Point 4


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COORDINATES TRANSFORMATION

There is no need to do coordinate transformation for Soil map because it is already in

MRSO. But it is need to be done for the Geology map. The transformation process is done by

the using external third party softwareMalaysian Coordinate Transformation.

The results of the coordinatestransformation:-

POINTS N E

1 139981.635680283m 612988.793829698m

2 388513.995888755m 608946.505380894m

3 583051.024279951m 244440.530646348m

4 690381.143558003m 456014.970075124m

Insert the latitude and

longitude of each control

points from the Google

The results after

conversion to RSO


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GEOREFERENCING

After the process of coordinate transformation was done, the next step is to give the image its

appropriate position in the world. This process is called Georeferencing . To prepare the

georeferenced of the map select CustomizeToolbarand tick the Toolbar. This willactivate and bring up the georeferencing toolbar

To georeference this scanned map, we will click points on the map with known coordinates

with the double-cross-hair button, located on the georeferencing toolbar which mean toadd control points.

Click on one of the four points, and then right click anywhere on the map and select input X

and Y. Type in the MRSO coordinate of the point that recorded earlier. After do this, your

map will disappear because ArcMap has moved it to the position we just entered. To find

the map, right click on the map name in the legend and select zoom to layer.

Now go and enter the second, third, and fourth point and do the same steps for first point in

order to enter the coordinates. By this point, the guess that ArcMap makes for the

coordinate should be pretty close.

Add control points


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Once have completed entering points and are satisfied with how the map coordinates

match the ArcMap project coordinates we are ready to finish georeferencing the map.

Select GeoreferencingRectify and give the rectified map a new name and format.

The new name of the rectified map is Soil_Peninsular1and in the .TIFFformat. Then insert

this rectified map to the ArcMap. The same steps were followed in georeferencing the

geology map. The rectified geology map was rename as Geology_North2 and

Geology_South2and also on .TIFFformat


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Results - Georeference Image

This image shows the actual coordinates in MRSO.

Geology Map

Soil Map

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Coordinate Capturing