GIS/GPS Programming

Question by

trevor1940

2017-08-30Solved

Javascript Binding data after clicking OpenLayers 2 map

Hi I'm adding points to an Openlayers 2 map by clicking the map and sending the co-ords to a PostGIS database and building html from the response this has additional links ect.

I'm also adding markers to the map from database return (I know it's doesn't work here)

In this recreation how do bind the new data
(The real data is on a closed system without internet access )

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
        <meta name="apple-mobile-web-app-capable" content="yes">
        <title>OpenLayers Click Event Example</title>
        
        <script src="https://openlayers.org/api/OpenLayers.js"></script>
          <script src="/jquery-ui-1.9.2.custom/js/jquery-1.8.3.js"></script>
        <style type="text/css">
          html, body, #mapdiv {
              width:100%; height:100%; margin:0;
          }
          
          .olImageLoadError { display: none; } /* no pink tiles */ 
        </style>
  
        <script type="text/javascript">
        
            //Set up a click handler
            OpenLayers.Control.Click = OpenLayers.Class(OpenLayers.Control, {                
                defaultHandlerOptions: {
                    'single': true,
                    'double': false,
                    'pixelTolerance': 0,
                    'stopSingle': false,

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…

9 Comments

Question by

trevor1940

2017-08-23Solved

Converting geometry to geography in PostgreSQL/ PostGIS

Hi
I have some point data stored in a postgreSQL/PostGIS Database
I need to do some distance measurements select point within 0.5 km of my point

something like

select * from geo_table where ST_DWithin('POINT(Long Lat)' ::geography,geog,0.5)

Open in new window

the problem is points are stored as Geometry Longitude, Latitude SRD= 4326

my geo_table has geom column created from Longitude, Latitude points and a currently empty geog column

Any idea how to create the geography column either from the existing geography column or from the Longitude, Latitude (Stored digitally not DMS ) columns?

thank you

Question by

soffcec

2017-08-06Solved

Windows 10 tablet with GPS

Are there any WIndows 10 tablets or laptop with build in GPS receiver ?

24 Comments

Question by

mohknight

2017-07-22

Locating GPS locations using GeoJSON

Hi,

I've got a GeoJSON file of administrative borders i.e. state and county, and a CSV file with 12,500+ named GPS coordinates located within the geographic area.

My boss wants me to use the GeoJSON identify the county for each GPS location so I end up with a CSV file (format) like;
LOCNAME, LOCLONG, LOCLAT, COUNTY, STATE

Is there any tool that can do this?

Thanks a bunch.

With AS3 I combined geolocation and accelerometer to direct the iphone, with its back towards a star at the sky. Accelerometer works fine for tilt 0-90 degrees ( directed towards horizon, phone vertical - towards zenith, phone horizontal with screen downwards) but geolocation heading of course flips around 45 degrees tilt and begins to show star direction + 180 degrees. Around 45 degrees tilt geolocation heading becomes very random and I would be very grateful for a suggested algorithm to eliminate the randomness of this phase shift.
_____________
Specifically my problem is:

Geolocation:
head = event.heading;
head2 = event.heading -180;
if(head2<0){head2 +=360;}

then
if(angleSky>45) {head3 = head2;} else {head3 = head} // angle obtained by accelerometer

Ideally above angleSky 45 the code should choose head3=head2 and that should then be a continuation of the heading below 45. But this is not the case. Sometimes the geolocation heading switches at 43 or 44. Thus what I have tried but not succeeded is to store head at 42 or 43 and then compare head3 with that. If head3 then is more than 100 degrees difference I tried to use the heading at 42-43. But I have not succeeded. Can it be that the aquisition rate, 50 mS is too fast? Or is this attempt to solve the problem not the optimal model?

5 Comments

Our company has a KML file that when imported into Google My Maps shows the current coordinates of a fishing boat in the North Atlantic ocean. We then embedded this Google Map into a webpage in an iFrame.

We have a problem in that the position of the ship does not auto-update (refresh) on the webpage. We must constantly re-import the KML file into Google My Maps and obtain new code to paste into our webpage. This is very impractical.

Up until about a year ago Google had a service called : Embed KML gadget. Using this tool you only need import your KML once and resulting webpage is always up-to-date showing current GPS positioning.

It's a longshot but can anyone out there help?

Cheers,
Steve

Dear Sir ,

I am working on a GIS Data creation application , I would like to have your need for customization .I want that when user open a ArcMap application It will ask for Login window and user need to put their credentials ,then it allow to go inside the ArcMap ,Where I have ArcGIS Service and after accessing these service user will start to digitize the features in both online and offline mode .

If user created the feature and he doesn't have any internet connection while digitizing the features then data store in local table and once internet connection is there it will automatically store in the central server .

I look forward your kind help

Thanks & Regards.

Laxman

1 Comment

Question by

newbieweb

2017-06-02Solved

Please explain about 360 degree video?

I saw a 360 degree camera the other day and thought they might come in handy for me. Maybe I wold use it while I am giving a virtual tour, for example.

What kinds of things are they good for? And bad for?

They seem impossible to edit...

Is it so the viewer can have a "Google Earth" kind of sensation?

Examples?

Thanks.

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Post by

Kristine Stewart

2017-05-24Edited

Fitness/tech junkies - the new Garmin 360 camera allows users to create data overlays, including speed, altitude, and distance traveled; it can even calculate stats like hang time and jump height.

https://www.theverge.com/circuitbreaker/2017/5/24/15676894/garmin-virb-360-3d-camera-price-specs

Garmin’s new 360-degree camera is waterproof and records 3D audioGarmin is expanding its action camera lineup into the world of 360-degree video. Today the company announced the VIRB 360, a waterproof spherical camera packed with bleeding-edge specs. The new...

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I have an iPhone 6 and hope to find an app or combination of tools to I can use to estimate distance and direction of objects (buildings) that are a mile or three away from me.

given the phone knows its location and orientation, might it be used w/ the camera to plot the location of the object I focus in on?

What's the easiest way to do this? I do not need precision, but just a pretty good estimate.

Thanks.

Question by

Max Destiny

2017-05-05

MapRoutes

Its supposed to be a map guider an accurate gps for car by giving the accurate route through roads car must do.

underlined line is what debug shows it as wrong.

any other

using System;

using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using Windows.Devices.Geolocation;
using Windows.Services.Maps;

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409

namespace App75
{
/// <summary>
/// An empty page that can be used on its own or navigated to within a Frame.
/// </summary>
public sealed partial class MainPage : Page
{
public MainPage()
{
this.InitializeComponent();

button.Tapped += Button_Tapped;
}

private async void Button_Tapped(object sender, TappedRoutedEventArgs e)
{
BasicGeoposition b1 = new BasicGeoposition();

b1.Latitude = Convert.ToDouble(startpositionlatitude.Text);

b1.Longitude = Convert.ToDouble(startpositionlongitude.Text);

BasicGeoposition b2 = new BasicGeoposition();
…

3 Comments

Question by

Chopp

2017-04-29Solved

Fee for Crystal Reports Consulting

Hello Experts,

I am an independent contractor. I make custom reports and maps for police departments. I use Crystal Reports, T-SQL to prepare scripts for handling data, and ESRI for mapping crime, AVL data, CAD data, etc. I have made $45 per hour since 2008. I want to raise my hourly rate - can you give me some ideas about what people charge for this skill set?

Thank you, Chop

5 Comments

Question by

Rob4077

2017-04-27Solved

Configuration suggestions

I am after some suggestions as to whether it is feasible to know where the mobile phones of our staff are at any particular moment and where they have been in the past so I can replace the expensive rental on GPS trackers in the cars.

BACKGROUND
* I work with a small electrical firm where each vehicle has a GPS tracking system that is soon to run out of rental contract.
* Staff are all equipped with an iPhone and a Galaxy TabA (can be hotspotted to iPhone)
* Office staff need to know where staff are at any particular time in order to efficiently assign urgent jobs
* Office staff also need to occasionally look to see where a vehicle was on a particular day
* I have no idea what an iPhone can do as far as reporting current position or historical tracking but I believe it can do it so some degree
* Using the iPhone for too much tracking can put a real drain on the battery so what are the options?
* The Tab A has GPS functionality but it's communication options are limited to WiFi
* I may be able to use TASKER on the Galaxy tab to log its position at regular intervals and email it to the office when connected to WiFi

Any suggestions would be appreciated

8 Comments

I have a problem in GIS coordinates. I have this excel file with unknown CRS

sample data:
source coordinate (EPSG:4994 PRS92)
x: 675282
y: 1217112
- note (the location of this coordinate should point in Ormoc City, Philippines, because i know where this entity is located)

target coordinate (EPSG:4326 WGS 84)
Lon: 124.6051799°
Lat: 11.0016664°

but when you show it on the map, the coordinates points somewhere near the port area instead of pointing in corner real and burgos streets, Ormoc City, Philippines (should be near this coordinate LON=124.60670952, LAT=11.0056316)

I'm using this https://epsg.io for the transformation. Do you have any formulas that i can write in my excel file to convert it properly? Thanks in advance.
sample-biz-coord.JPG

Question by

tommym121

2017-04-10Solved

Deploying a class library/Referencing a DLL

Hi there,

I have built a class library (dll) in visual studio that creates an activeX control object to be used inside another container program (engineering software). I downloaded MapWinGIS, which is an "ActiveX Control and application programmer interface ". The API does most of the heavy lifting and I am able to compile/embed the activeX object inside the container, but I am a little confused about how to deploy this onto other workstations...

I would think its more complicated than simply dragging the project folder over to the workstation. I have done some elementary research on this topic and some people have suggested that I will have to install MapWinGIS onto each workstation at the very least to ensure that all the referenced files are present and then I would have to register the class library itself using either gactutil, regasm /codebase or regsvr32.

I am just not sure, any advice would be greatly appreciated.
Thanks

4 Comments

Question by

cmb991

2017-04-08SolvedPrivate

Windows 10 and Garmin GPS for location

Is there anyway I can hook up a garmin gps I have via USB and have it used for location services on Windows 10?

We try to use the location and Siri to remind us of certain things when leaving the office. However, no succes. That said, how can we use Siri successfully to remind us of certain things when leaving the office? Also, how accurate will the location be? (For example, will the reminder be activated as soon as we leave the door or 200 feets of current location the reminder will be fired?)

Thanx in advance!

5 Comments

Question by

mkramer777

2017-03-21Solved

google earth

I made an outline in google earth a few months back and now I cannot delete it. I cannot get the mouse to grab it. Any ideas?

4 Comments

Is there anyone here familiar with SKiaSharp or SKia (a search here found no mention of this software)? Basically, I take the survey lines from a survey, and draw the outline of the land, using SkiaSharp\DrawPath. This works fine for straight line surveys, but it cannot handle lines that are not straight. I have posted in the Xamarin\Skiasharp forum...https://forums.xamarin.com/discussion/90526/how-to-add-survey-curve-info-to-my-drawpath-image#latest, but have not had any replies. And, I cannot find any examples\samples on the subject. If you think that I should be posting elsewhere, please point me in the right direction.

GIS/GPS Programming

Hi,

Google chrome GPS location could not be determined.Some times works fine.otherwise not working.Please suggest me any other for access location in google chrome browser.We want goole chrome browser access gps location.

Every day we are facing this issue in our PC's.Work fine in LAptop & mobile chrome browsers

11 Comments

Question by

sandy ware

2017-03-09Solved

find Speed using GPS latitude & longitude

Environment :
1. Linux, C++
2. UM7 Device contains (GPS latitude, longitude, Altitude, Accelerometer, Gyrometer).

I am getting below data using UM7 device fitted on moving vehicle :

GPS latitude, longitude, Altitude.

Accelerometer (x,y,z)

Gyrometer (x,y,z)

How can I calculate vehicle movements (left, right) using
Latitude, Longitude & Altitude ,Accelerometer, Gyrometer data ?

How can I calculate Speed ?

Any suggestion / help is highly appreciated.

4 Comments

Question by

James Ali

2017-02-24Solved

Tracking UDID

hello ,,

i want to know if it possible to track a phone by UDID

6 Comments

Question by

websss

2017-02-08

Openlayers 2.12 memory leak

My app has been VERY slow of late, when I looked into it, it appears there is a massive memory leak It climbs up to 2gb and crashes

We used took three Heap Snapshots on chrome developer tool,

one during login (when the google maps are loaded) another after everything loaded, and another when signalR pushes the data.

We compared the three snapshots, Open Layer stuff had many detached dom trees and kept building up. Therefore, Open layers has contributed to the memory leak of the app greatly.

Among the functions that we suspected caused the memory leak are:

clearMarkers(),

removePopup(map.popups[0]),

removeFeatures(markerLayer.features),

flagLayer.removeFeatures(flagLayer.features);

markerLayer.removeFeatures(markerLayer.features).

After some few minutes the app crashes due to large amount of the memory used. The question is, how can we deal with this situation so that there are no memory leak in the app that is caused by the Open layers.

Also, when clicking anywhere on the app even in the pages where maps are not loaded, Open layer function are called. When Click events get fired they in turn calls the Open Layers functions.