satellite | 易学教程

ECEF from Azimuth, Elevation, Range and Observer Lat,Lon,Alt

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问题 I'm trying to write a basic python script that will track a given satellite, defined with tle's, from a given location. I'm not a asto/orbital person but am trying to become smarter on it. I am running into a problem when I try to convert the azimuth, elevation, range values to a ECEF position. I'm using PyEphem to get the observation values and spg4 to get the real location to verify. I'm also using the website, http://www.n2yo.com/?s=25544, the verify the values. I'm getting the observed

Getting the number of satellites from Location object

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问题 I'm using a GPS provider and LocationListener.onLocationChanged(Location location) to receive location fixes. Documentation says, that Location.getExtras() contains next key/value pair: satellites - the number of satellites used to derive the fix but on practice I'm getting an empty extra object - there is no any data there. Does it means that I'm getting the A-GPS fixes and not GPS? 回答1: To get the number of satellites used by the GPS engine you need to implement android.location.GpsStatus

Leaflet Map API with Google Satellite Layer

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I'm very interested in the Leaflet Map API . However, I need to be able to use the Google Satellite Layer. I have not been able to find an example on how to add a Google Satellite Layer to Leaflet. I understand that I will still need to load the Google Maps API to do this (OpenLayers has an example). Leaflet has an official page for publishing all available plugins: http://leafletjs.com/plugins.html You will find plugins there for adding Google layers support to Leaflet. You don't need a plugin or the Google API, you can add it as a XYZ tile layer. Streets googleStreets = L.tileLayer('http://