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GIS/GPS Programming

The Global Positioning System (GPS) is a space-based global navigation satellite system (GNSS) that provides reliable location and time information in all weather and at all times and anywhere on or near the Earth when and where there is an unobstructed line of sight to four or more GPS satellites. A geographic information system (GIS) or geospatial information system is any system that captures, stores, analyzes, manages, and presents data that are linked to location(s). In the simplest terms, GIS is the merging of cartography, statistical analysis, and database technology.

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Dear All,

I have a device (installed on vehicle) which sends latitude and longitude on the Server through GPS. I have a route of that vehicle which is successfully plotted on Google Map.

My Problem is how can I plot latitude and longitude at runtime on Google Map in PHP dynamically on Desktop Application. I want to plot fetched latest latitude and longitude on Google Map to show where the vehicle is running.
Introduction to Web Design
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Introduction to Web Design

Develop a strong foundation and understanding of web design by learning HTML, CSS, and additional tools to help you develop your own website.

Google Elevation API
The article's main focus is , to create a C# console application using Google's Elevation API. For more detailed information about this topic, use the attached links.
The article's main focus is , to create the application using Google's GeoCoding/Reverse Geocoding. This article will teach you what GeoCoding and Reverse Geocoding is and how to write a simple C# console application. I also added some links, for more detailed information for this topic.
What FREE Android Phone tracking location AT&T APP do you recommend so I can find where my child is currently at if needed ?

 1. https://mobile-tracker-free.com
 2. etc ?
How to convert Polyline Z to normal polyline
How can I indicate to my iPhone X that I am walking (and not driving) while I am using the built-in GPS map services to provide me with turn by turn directions?

This is especially important since I visit a lot of towns that have one-way streets.
Need iPhone app to track my location

I need to sell on the road and sometimes need a reminder which stores I visited. So, a map if where I went each day would be helpful.

What options do I have?

Is there location data already on the phone I can use?

I have successfully installed tilemill and styled my maps using OSMBRIGHT as the a starting point
I've edited this theme to get it the way i need, it looks great apart from one thing:

I when zoom out to the world, the style is pretty bland (just one colour)
I wanted to use something like google streets on full zoom out level

or like this

I've found something called natural earth 2 which also looks nice

My question is, how can i style OSM bright at max zoom out levels to look like the above?

I've been looking an it appears i need to apply GlobalLandCover layers like

I'm currently using Raster tiles

This is the base.mss that I was using as my starting point

Can someone give me the code to achieve the above please?
My Galaxy Note 4 (already updated to latest Android) tends to lose
connectivity to GPS (even though the connection to cellular/mobile
data network seems to be intact) while driving for 3 to 30 secs.

I'm using Waze.  The disconnection can happen even on a bright
sunny day (ie don't have to be cloudy/rainy days) or in open
highway (ie not while going through tunnels).

The same SIM card was previously used on my Galaxy Note 2 for
for almost a whole year previously & I never had this issue.

Is this a known issue with Note 4 or the Telco ?  Maybe one way I
can test this is to use the Note 4 as a hotspot (tethering) to an
iPhone & test to see if Waze/GPS  disconnects intermittently:
map is still there but there's a red alert message that 'connection
to GPS is disconnected' at the top of the screen.

I only noted 2 changes:
1. I switch from Note 2 to Note 4 at around the time I disposed
    the old Honda Airwave to Toyota Sienta hybrid: not sure if
    there's something in Sienta that interferes
2. Note4 tends to get very heated up while Note2 is not that
    hot while Waze is in use: I've since taken out the backcover
    of the Note4 (& used scotch tapes to hold the battery & SIM
    card in place) when in use so that the heat dissipates
Can I replicate a search using the Google Maps API local search with  an iOS MKLocalSearchRequest() ?  For example, using the Google API, making a map search using the keyword "hostels" works correctly. In iOS using MKLocalSearchRequest(), using a naturalLanguageQuery, I just get hotels. Is there a way to fix this?  Or am i forced to use the Google Maps API within iOS?
Build an E-Commerce Site with Angular 5
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Build an E-Commerce Site with Angular 5

Learn how to build an E-Commerce site with Angular 5, a JavaScript framework used by developers to build web, desktop, and mobile applications.

Need SLQ (or other systematic way) to change XCOORD and YCOORD  into the  Latitude and Longitude GIS format.

Sample XCOORD: 2121551
Sample YCOORD: 19744813

Sample Latitude: 29.49252
Sample Longitude: -98.67554

I have  a data set of 500 000 rows and need to have a daily systematic way to have this done in SQL (preferably).
I have the following c# code(all variables are doubles)

 if (Latitude == lastLocation.Latitude && Longitude == lastLocation.Longitude)

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This just compares exact numbers, what i need to do is Compare latitude and longitude to see if in 10 meters of previous location
This code runs 100 times a second, so i need it to be super fast too

I'm not sure how to achieve this so would appreciate some code help
Where can I buy gps tracking device who will upload location to server at your own choose.
Hiding labels on Google Maps / Street View

There is a label in exactly the wrong place and I need to hide it.


Plotting Photos on a Map

I have pictures from an iPhone6, iPhone 7 and a Canon PowerShot.

I know the iPhone 7 photos have the geo coding embedded. But I need to verify the Canon Power Shot is working for geo coding.

And if not, I may buy a new camera for myself.

And how do I view a folder of image and plot them all on a map?

Need Free Satellite Photos of New York City

I found Google Earth displays perfectly the images I need to use. But if I used that image in a presentation, I could be sued by Google.

So, I would never do that, clearly.

Are there other ways to get Satellite Photos of New York City which are public domain? Or that have some easy to accept license such as putting a copyright notice at the bottom?

I heard some French company had some which were free?

Can you please give me any Satellite Photos websites I can check their terms??

Hi I need to find the distance between 2 pin codes. For that i would like to find the center point within each pincode and calculate distance between them. This is for my internship project. So how to find the center point within each pin code?
Employee Tracking - GPS - I want app to web solution for tracking my sales employee and location with form to be filed when they reach that location.
There a lots of gps apps, but usually they are more for cars & vehicles.  We are looking for one that can we can find each other within a mall or a department store.  Any EE knows of any good ones?
Amazon Web Services
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Amazon Web Services

Are you thinking about creating an Amazon Web Services account for your business? Not sure where to start? In this course you’ll get an overview of the history of AWS and take a tour of their user interface.


I need to calculate the Grid value based on lon/lat value of particular point  on map. The attached file display the "test_incident" point , need to calculate that point grid value.

Is there any formulas /algorithms  or any API to calculate the grid value.

I wanna buy a tablets for sales staff at the company to use Citrix Apps and also to track their track.

1- What are the best brands with best price.
2- These tablets must be easy to monitoring by auditing account staff.
3- Is there a mobile printer that can be connected to the tablets and what are the best types?

I have to process a list of latitude and longitude co-ordinates to see if a device has moved in/out of a geo zone

Previously, the app was single threaded, and we delayed processing this information for a few minutes, then we ordered the list by the dateTime and then checked each item in date order to see if it entered / exited a zone

12:00:01 - not in zone
12:00:02 - not in zone
12:00:03 -  in zone
12:00:04 -  in zone
12:00:05 -  in zone
12:00:06 -  in zone
12:00:07 -  in zone
12:00:08 - not in zone
12:00:09 - not in zone

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this then saves date to db like
12:00:03 - entered the zone
12:00:08 - exited the zone

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We have since made the console app multithreaded and we are now seeing race conditions where the data is processed in the wrong order, and its causing data integrity issues where sometimes exits the zone too early, and then the next record see's its inside the zone, therefore its creating data like this

12:00:06 - entered the zone
12:00:08 - exited the zone

12:00:04 - entered the zone
12:00:09 - exited the zone

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the user then thinks the device entered the zone twice, when it was infact just once

Due to the high volume of data we process we need to stick with multithreaded solution
We currently check the next item in the list against the in memory "lastPosition" object

I'm now thinking we need to change the approach where we check 1 record against another, and batch the records to speed up performance …
What are the Least expensive tracking products and options for tracking my vehicle using GPS?

  I am running a loan business for cars.

  I am looking for a GPS software solution that would allow me to monitor each car.   With features that allow me to track the car locations, turn it off, and help me in case to locate the car if the customer does not pay.     Could be web base, monthly payments, safe and secure installations of the device in the car and others features.

  Please send me your recommendations.


   Joe Echavarria
I have a simple equation to calculate the "CL" from the sum of four different grids as:

CL = A + B + C + D

I am attempting to use the mc2d package with R to express uncertainty in the CL results based on uncertainties in each of the input grids.

The uncertainty in each input grid is expressed based on uniform distributions with uncertainty ranges of:

+/- 6 for raster A
+/- 10 for raster B
+/- 12 for raster C
+/- 5 for raster D

I would like to run a Monte Carlo simulation whereby the input grids are summed multiple times (e.g. n = 1000) based on values for each grid cell that are randomly selected from within these uncertainty ranges

The code below fails with:
Error in .calcTest(x[1:5], fun, na.rm, forcefun, forceapply) :
    cannot use this function

Any suggested edits?

library(mc2d) #load package

# Input grid files
A <- raster(matrix(c(20, 35, 40, 60), nrow=2))
B <- raster(matrix(c(6, 10, 13, 14), nrow=2))
C <- raster(matrix(c(6, 8, 12, 14), nrow=2))
D <- raster(matrix(c(35, 40, 50, 60), nrow=2))

# combine the RasterLayer objects into a RasterStack 
s <- stack(A, B, C, D)

# Uncertainty distance for each raster used to establish the 
# min/max for the uniform distributions in the function just below
uA <- 6
uB <- 10
uC <- 12
uD <- 5

# Function for generating CL
fun <- function(x) {
  # Convert each raster to mcnode object
  dA <- mcdata(x[1], type="0")
  dB <- mcdata(x[2], 

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GIS/GPS Programming

The Global Positioning System (GPS) is a space-based global navigation satellite system (GNSS) that provides reliable location and time information in all weather and at all times and anywhere on or near the Earth when and where there is an unobstructed line of sight to four or more GPS satellites. A geographic information system (GIS) or geospatial information system is any system that captures, stores, analyzes, manages, and presents data that are linked to location(s). In the simplest terms, GIS is the merging of cartography, statistical analysis, and database technology.

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GIS/GPS Programming