Questions tagged [position]

The latitude, longitude, and altitude (x,y,z coordinates) of a point, often accompanied by an estimate of error.

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22 views

Calculating satellite position in lat, lon given the position of receiver, altitude of satellite, azimuth and elevation angles

I want to calculate position of a satellite, given the position of the receiver, azimuth,elevation angles and height above ellipsoid for the satellite. I think this should be a simple geometry problem ...
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25 views

How to get a 1m precision coordinates?

I'm working on a project which examines different approaches for indoor positioning. All of these approaches return coordinates (lat/lon). What I need to do is create a digital map to compare returned ...
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Seeking Public API to get GPS satellite's position?

Is there any public availible API that allows you to retrieve the current coordinates of satellites such as GPS and Galileo? I've only found ways to get Satellites Ephemeries and calculate the ...
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1answer
33 views

How to calculate a position based on nearby sensors with weights

I'm working on an indoor-positioning project where the users are carrying phones which can detect beacons located throughout the facility. The phone app only knows the IDs of the beacons, and can ...
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91 views

OpenLayers 4 change position on load and input change

I have map which should show position depends on input, which I control with switch. Long and Lat I am getting from API (depends on my input) which return to me coordinates. How can I show position ...
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63 views

Spatial-analyst, detecting bad ones from good positions GPS coordinates with QGIS?

I'm curious if someone else has been thru this problem and how it was solved. Many years back people marked the position manually on a map to get waypoints of for example electric wire connection ...
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34 views

How to find for which segment belongs this point?

I'm using an OSM dataset of Chicago which contains longitude and latitude of the source and the target of each segment road. I want to find the point with coordinates equals to: POINT (-87.7439318058 ...
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1answer
478 views

openlayers 3 and geolocation without HTTPS

I am creating an application where user can locate himself on map. the code is working fine in local development environment, but when i deploy it over server(IIS) the code won't work. here is code : ...
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1answer
48 views

Can not solve Kramberg equation

The problem is posed as follows: "There are 5 satellites, need to find the points: x,y,z." There is an equation: 23 ^ 2 = (x-12) ^ 2 + (y-25) ^ 2 + (z-24) ^ 2 25 ^ 2 = (x-(-53)) ^ 2 + (y-19) ^ 2 + ...
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1answer
54 views

Projection or XYs in QGIS

I am trying to project some data that I got. I have .txt files with XYs and they are correct, the problem that when I project the data, the points appearing in a different geographical location than ...
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66 views

Urban positional accuracy of Google Streetview [closed]

How does Google Streetview have accurate locations in urban environments, such as in tunnels, below buildings and next to buildings?
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115 views

Position of vehicles relative to lead vehicle

I have a set of vehicles (think railway) that are in a (semi)fixed formation. I know the lead vehicle and I know the GPS coordinates of the lead vehicle at any given time. Sometimes, I can rely on the ...
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1answer
629 views

leaflet: current location in geojson polygons

I'm coding an app with Phonegap, which requests user's current position. As an overlay I have loaded a geojson layer. I want the app to automatically extract a value of said layer at the exact ...
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Layers move when using specific CRS

Using Google Satellite for a basemap and polygons (KML) drawn from Google Earth to create additional polygons using landscape features present on Google Earth and Google Basemap, within the original ...
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22 views

Does related localization give more accuracy?

Let's suppose that we use another device as an RTK base. Both base and rover are moving and communicate constantly (via 5G for instance). Besides they get common GPS error from the satellite on the ...
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2answers
118 views

Correcting commercial grade GPS data to 2 meter accuracy in RT?

I have a set of rovers with commercial grade GPS boards (Adafruit Ultimate GPS Breakout). They send their uncorrected data to the central server. There, before recording each position in the database, ...
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1answer
519 views

How is user range error (URE) calculated/estimated in a basic receiver?

For a basic receiver how can we estimate/calculate URE when the pseudorange observable is used? Assume that it is a single frequency (L1) receiver. Is there any metric that can be used to estimate ...
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1answer
475 views

Sticking GPS waypoints to closest road?

I am new with QGIS. I want to study the performance of different GPS receivers, and to do so I need to compute the error made by each one. The problem is that I don't have any reference to be ...
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1answer
169 views

QGIS 2.14.3. positioning gap between OpenLayers layer and aerial image

When I add aerial images from a recent survey (delivered in EPSG:31468, DHDN_3_Degree_Gauss_Zone_4) to an empty project together with an OpenLayers OSM layer I'm facing a strange positioning issue. I ...
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1answer
662 views

QGIS problem with positions of imported waypoints

I'm a newbie to QGIS. The waypoint data was collected on a Garmin etrex legend H, with the grid set to OSGB36. Using Garmin's Basecamp software, I saved the waypoints as a gpx file (also xml etc ...
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1answer
695 views

Topographic Position Index unexpected result in QGIS

I am using Windows 7 enterprise and QGIS version 2.12.2 Lyon. Have found an unexpected result when I use QGIS to generate a topographic position index (TPI) raster from a 30m by 30m DEM. I find a ...
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1answer
342 views

Keep only the last marker when geolocating

I'm working with OpenLayers 2 and I managed to create a javascript to locate the users and it works fine. I added a marker representing the current location and when the position change, it creates a ...
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1answer
861 views

Find out if overlaying polyline matches polygon centerline in qgis

I have a polygon and a polyline and I need to find a scientific way of how close that polyline is to the actual polygon centerline. Is there any way of doing this in qgis? Any extensions, models, ...
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1answer
5k views

Leaflet fitBounds Starting Position

I am creating a Leaflet application that uses the code from the Simple CSV template to set the bounds of the map to the selected markers. The issue I have is that I want to set a start position that ...
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1answer
530 views

Displaying current position using QGIS?

How can I display my current position in the QGIS canvas, similar to the "blue point" in google mapsa? I need this to navigate to defined points and I do not want to change the program all the time.
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397 views

Converting a geocentric latitude to a geodetic latitude [duplicate]

I'm working with a 3D model of the earth (WGS84). The input to my problem is a geocentric lat-long. Is there an efficient way to convert this to a geodetic lat-long? My initial attempt to solve ...
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1answer
70 views

Right coordinates for data defined position of diagrams

I'm using QGIS 2.8.2 and want to define the position of diagrams with x and y coordinates. The same thing works with the labels, but when I define coordinates for the diagrams they just disappear. ...
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293 views

Placing a label based on a point's location within a polygon

I have a polygon dataset and a point data set with occupants. I need to label the occupants of the house within the polygon and need the label to show up on the side associated with its polygon. ...
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1answer
2k views

Centering custom control horizontally in OpenLayers 3? [closed]

This is more like a CSS question than a GIS one. But I don't have any clue how to center an element that has an absolute position. Here's some relevant markup for my icon category selector that I ...
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202 views

Postgis - st_MakeLine and st_lineLocatePoint

Lets explain, I have 4 points (1,2,3,4), and I need to visit clients (A, B, C, D). So, I need to use st_makeline with (1,2,3,4,3)... Now I have to get % position from A,B,C,D; but in visit order. ...
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183 views

Calculate geographic position based on azimuth, distance and height [duplicate]

How to calculate the geographic position of an object in sky (Point B)(like an aircraft) from Home Point (Point A) based on only four variables: Lattitude and Longitude at Home Point, Azimuth at ...
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451 views

How to compute satellite coordinates (lat,long) given antenna's coordinates, angles and satellite height

Given an Earth station (antenna) coordinates (in lat,long) ant its Elevation (El) and Azimuth (Az), how to compute the satellite coordinates (lat,long), known its height? For simplification purposes, ...
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2answers
925 views

Calculating new satellite position given pseudorange measurements

I'm looking for a reference/text for an explicit formula to calculate a satellite position given pseudorange measurements from later epoch times. I've seen a lot of matlab code on the internet but I ...
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1k views

Trilateration using two or three points

We have a positioning system where we can measure our range without 0.1m from multiple beacons. The placement of the beacons is about on a 1-2km box. So we could get anywhere from 2-4 ranges from ...
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1answer
95 views

How to detect other objects are on which side of an object based on lat long

I am working on a system that detects the lat/long of vehicles. I want to track other vehicle's position: left, top-left, right, top-right, bottom-right, bottom-left etc based on lat/long. I have ...
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823 views

Python code to determine the position on a map using Geo-Tagging

What is a proper python code, which enables to scan photographs (when captured from a series of snapshots) and match it with a geo-tagged image database. Based on the extent of similarities existing ...
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1answer
459 views

Unique Natural Area Code (NAC) for a building

NAC is a geocode system for identifying an object anywhere on the Earth. I am going to assign a unique NAC address for each building in Detroit. But different NAC addressed can be assigned to each ...
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2answers
52 views

Recommended way to explicitly distinguish 2D from 3D locations

In strongly typed object-oriented programming environment, I want to make an explicit distinction between two types of Locations: One type would be 2D (along Earth surface), thus having Latitude and ...
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0answers
311 views

Bing OpenLayers shows OK in QGIS and Composer preview, but is misaligned after exporting to PDF

I have QGIS 2.2 running on a Mac with iOS Maverick. I have prepared a map with layers with different CRS, including a Bing OpenLayers as base layer. The project has the 'On the fly coordinate ...
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536 views

LLA vs ECEF--which to choose?

I will be providing points in 3D to an external source via XML. One coworker suggests Lat/Long/Alt and another suggests ECEF. We can do either without much trouble. We have an existing product that ...
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2answers
1k views

How to calculate position in a picture based on latitude/longitude

I have got a picture on which a user manually marks some points. Let's say for simplicity's sake these points always create a 4 point convex polygon. For each one of these points I know latitude and ...
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1answer
198 views

Analysis of positioning polygon on polygon using ArcGIS

This might be a really complex analysis and I'm not entirely sure how possible it is but it is worth a shot. Is it possible to do analysis of positioning between either a "polygon and polygon" or "...
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3answers
3k views

What format is this GPS tracking string?

I am receiving tracking data from a device and I am not sure what is the format/standard of this string in order to properly process the variables, this is a sample string received: #355488020131816##...
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1answer
1k views

How to calculate relative height of point on slope relative to nearest creek and ridge?

I'm attempting to calculate the relative height (values between 0 and 1 preferably) of waypoints on a slope along the path of least resistance. Ideally, points in creeks would have values of 0 and ...
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0answers
608 views

How to locate a house on the 3D Map correctly?

I've done my 3D map generation in WebGL/THREE.JS project and have an issue with the building locations. I have the data about building position ( its polygon ) from DB server, but first of all I want ...
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5answers
34k views

Explanations for Various GIS Job Titles

I've been out of school and working in the GIS field (mostly the field of a desk) for over five years now. The one consistency I've found when working for various companies and applying for various ...