LocationSensor Extension. Accuracy. Geocoder. GeomagneticField

Extensions
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Hello friends,

this Extension is about:

1.- SensorLocation.

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  • It uses the classes:

https://developer.android.com/reference/android/location/LocationManager.html

https://developer.android.com/reference/android/location/Location

In those pages you can find information about:
getLatitude, getLongitude, getAltitude, getSpeed ​​(m/s), bearing, bearingTo, distanceTo, getTime and convert.

bearingTo and distanceTo refers to the Properties: LatitudeTo and LongitudeTo.

Bearing: https://en.wikipedia.org/wiki/Bearing_(navigation)
Bearing online: https://www.sunearthtools.com/tools/distance.php

2.- Geocoder.

Blocks: getFromLocation and getFromLocationName

Gets:
adminArea, countryCode, countryName, feature, locality, phone, postalCode, premises, subAdmin, subLocality, subThoroughfare, thoroughfare, url

  • It uses the classes:

https://developer.android.com/reference/android/location/Address

https://developer.android.com/reference/android/location/Geocoder

3.- GeomagneticField.

Gets:
declination, fieldStrength, horizontalStrength, inclination, x, y, z

  • It uses the classes:

https://developer.android.com/reference/android/hardware/GeomagneticField

Read:
https://www.ngdc.noaa.gov/geomag/WMM/DoDWMM.shtml

Earth’s Magnetic North Pole Has Officially Moved (Toward Russia):
https://www.forbes.com/sites/trevornace/2019/12/17/earths-magnetic-north-pole-has-officially-moved-toward-russia/#7688ea47201f

4.- This app uses LocationSensor Extension (black text) and LocationSensor of MIT App Inventor (blue text).

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On the Map Screen, the coordinates of the red dot are obtained with the Extension and those of the blue dot with MIT App Inventor.

p185C_sensorlocalizacion.aia (33.5 KB)

You can download the com.KIO4_LocationSensor.aix extension of:
http://kio4.com/appinventor/285C_extension_sensor_localizacion.htm

Regards,
Juan Antonio Villalpando.
http://kio4.com/appinventor/index.htm#extensiones

8 Likes
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With Kodular you can also use Google Maps:

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Hi Juan,

I’ve made a test with your extension because I try to get centimeter accuracy for some applications. The number of digits provided by AI2 when you get latitude/longitude gives you an accuracy of 10 meters witch is not enought in some cases.
My problem is that using it I don’t get more digits and also no information about accuracy (this information is available in the GST NMEA message)
Do you have any idea ?

Screenshot_20200328-183324
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Hello Bertrand,

I have published two extensions about GPS:

in both I obtain a value of latitude and longitude with 5 decimals and an accuracy of approximately 3 … 5 meters.
I think that the accuracy of centimeters can be obtained with Galileo satellites, but I have not used that technology.

1 Like
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Hi Juan,

In fact you can get something like less than one meter accuracy with the new dual frequency GNSS chipsets that you have in Samsung Snapdragon or Xiami Mi8 and +

You can also get 1cm accuracy on your smartphone if you connect the external Trimble Catalyst antenna…
Applications are endless…

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@Juan_Antonio
Is there a way to get also the $GST NMEA message (location accuracy) ?
Are your extensions published on the MIT extension repository ? It’s not clear on your website witch one is the latest one.
I’ve made a test but it doen’t work. Do you seesomething wrong in my blocs ?
Thank you

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Try this
Nmea_30.aia (15.6 KB)

I can get GN—, but not GP—

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Look what I have with the Nmea_30 program

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Juan your extension and example are super.
it compares very well to my garmin Vista
great job

thanks
erhard

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  • Information about Galileo (GPS in Europe).

Galileo’s capabilities have grown with the addition of a new High Accuracy Service, freely available worldwide to anyone with a suitably equipped receiver. Delivering horizontal accuracy down to 20 cm and vertical accuracy of 40 cm,

https://www.esa.int/Applications/Navigation/New_Galileo_service_set_to_deliver_20_cm_accuracy

https://www.usegalileo.eu/ES/inner.html#data=smartphone

https://play.google.com/store/apps/details?id=com.android.gpstest

2 Likes