Ground truth of road sign as look-up table

To whom it may concern,

I am wondering how a look-up table can be formulated in Simulink.

The data consists of lat. long. and corresponding informations as below..

col1 (lat) col2(long.) road sign index info

37.35 128.38 1

37.36 129.25 3

.... ....

What I am intending is to find the closest corresponding road sign index info based on latitude & longitude received from GPS. Could anyone give me some tip which type of look-up table should be used?

Best regards,

KW

Answer 1

[Shlok]

Hi Keunwook,

A 2D Lookup Table would be most suitable in finding the closest corresponding road sign for a particular latitude and longitude. This lookup table will have two input parameters i.e. latitude and longitude which can be configured using Breakpoints.

The lookup table can be configured as follows:

1. First set the "Number of table dimensions" to 2.

2. Then under "Table and Breakpoints", enter the data:

• Set "Breakpoints 1" to the latitude values.
• Set "Breakpoints 2" to the longitude values.
• Enter the road sign index data in the "Table data" field.

3. Now go to the "Algorithm" tab and set "Interpolation method" as "Nearest" for discrete road signs.

Therefore, using a 2D Lookup Table with nearest neighbour interpolation will provide a quick access to the closest matching data point. This approach works for latest releases as well.

To know more about “2D Lookup Table” block, refer to the following documentation link:

https://www.mathworks.com/help/simulink/slref/2dlookuptable.html