Some questions about test5 msgconv sample

Accelerated Computing Intelligent Video Analytics DeepStream SDK
1

• Hardware Platform (Jetson nx)
**• DeepStream Version 5.1 **
**• JetPack Version 4.5 **

some question about “dstest5_msgconv_sample_config.txt”

1. what “coordinate” mean?

[sensor0]
…
location=45.293701447;-75.8303914499;48.1557479338
coordinate=5.2;10.1;11.2

I find following description in “libs/nvmsgconv/ncmsgconv.cpp”. does “coordinate” means direction?

“location”: {
“lat”: 45.99,
“lon”: 35.54,
“alt”: 79.03
},
“coordinate”: {
“x”: 5.2,
“y”: 10.1,
“z”: 11.2
}

2. there are “location” and “coordinate” in [place] group too, are they same with that in [sensor] group? if same, “location” of [place] and [sensor] should be almost same?

[place0]
…
location=30.32;-40.55;100.0
coordinate=1.0;2.0;3.0

3. what does “place-sub-field” mean? how to use?

[place0]
…
place-sub-field1=C_127_158
place-sub-field2=Lane 1
place-sub-field3=P1

4. in analytics group, source=OpenALR is fixed format?
is OpenALR means openALPR (automaticlicense plate recognition project) ?

[analytics0]
enable=1
id=XYZ_1
description=Vehicle Detection and License Plate Recognition
source=OpenALR
version=1.0

3

Hi,
1. what “coordinate” mean?

[sensor0]
…
location=45.293701447;-75.8303914499;48.1557479338
coordinate=5.2;10.1;11.2

I find following description in “libs/nvmsgconv/ncmsgconv.cpp”. does “coordinate” means direction?

“location”: {
“lat”: 45.99,
“lon”: 35.54,
“alt”: 79.03
},
“coordinate”: {
“x”: 5.2,
“y”: 10.1,
“z”: 11.2
}

3. what does “place-sub-field” mean? how to use?

[place0]
…
place-sub-field1=C_127_158
place-sub-field2=Lane 1
place-sub-field3=P1

→ coordinate is the map location co-ordinates, palce sub-field gives more details about the sensor in this exmaple. you can think of it as - its near the walsh street intersection, lane1 of the garapage and the garage level is P1. this is specific for the endeavor garage usecase.
For the real usecase, it could be anything based on the location of the sensor being used. Users have to modify this fields and add suitable values matching their usercase

2. there are “location” and “coordinate” in [place] group too, are they same with that in [sensor] group? if same, “location” of [place] and [sensor] should be almost same?

[place0]
…
location=30.32;-40.55;100.0
coordinate=1.0;2.0;3.0

→ No, they are not same. sensor if you use camera, place if you use car garage

4. in analytics group, source=OpenALR is fixed format?
is OpenALR means openALPR (automaticlicense plate recognition project) ?

[analytics0]
enable=1
id=XYZ_1
description=Vehicle Detection and License Plate Recognition
source=OpenALR
version=1.0

→ No, they are not fixed. you can set it in the configuration file, it got parsed by function nvds_msg2p_parse_analytics