Are you (w)here?

Using maps in your projects

Who are you?

<h4>Introduction</h4>

function conference(greatSpeach) {
  greatSpeach.tell = 'Go!';
}

let intro = {
girl: 'Khrystyna', 
student: true, 
location: 'Chernivtsi',
tell : 'Waiting'

};

let ready, set;

ready = intro.tell; 

myFunc(intro);
set = intro.tell;

Where you can find me

 

Telegram

@crofty_land

GitHub

  https://github.com/Croftyland

Twitter

@croftyland

Why are you interested?

 Huh?

My use case

Create geolocation in TinderClone

So poor information...

Case 1

I'm lazy 

I don't want to make it from scratch.

Wish got ready code

I have some good news

Google Map is not only one solution 

1. ArcGIS DevLabs

ArcGIS is a platform for organizations to create, manage, share, and analyze spatial data. It consists of server components, mobile and desktop applications, and developer tools.

2. Quickstart-map-js


A simple set of examples that illustrate how to accomplish different mapping (and GIS) tasks with the ArcGIS API for JavaScript and ArcGIS Online Services.

3. Story Map Tour

Each "story point" in the narrative is geo-located. Users have the option of clicking sequentially through the narrative, or they can browse by interacting with the map or using the thumbnail carousel.

4. CARTO

 

 

CARTO previously known as CartoDB is the best platform for complex and dynamic geospatial data visualization and analysis. But don’t be afraid it offers also a lot of drag and drop easy to use tools for newbies.

5. Mapbox

 

 

Mapbox is a geo-visualization platform that gives easy to use set of tool for creating beautiful web and mobile maps. It offers users a full control over map styling (including background map) and has a lot of cool additional services such as satellite images, geocoding or directions.

6. HERE Data Lens

 

 

 

Here Data Lens is a set of APIs that provide a seamless developer experience for creation & deployment cool data visualisations. Most importantly it gives you an access to amazing HERE’s maps database with unique features like isoline routing.

7. Maps4news

 

 

 

Maps4news is a platform that allows for designing cool looking maps online and downloading them in a vector format needed for printed media (and for editing by designers). There is some basic interactivity that you can add if you want to publish it online.

Case 2

It's cool but have you reached your goal?

Can you improve it?

Absolutely!!!

 

Let me show you

How it works?

1. Request a position

2. Coordinates

You can then build a compelling, location-aware application!!!

Crash course

  • Vanilla JavaScript
  • Angular
  • ReactJS

CodeNewbie

Fetch is good but ...

but not all browsers support it

Just keep in mind

Chapter 1

Vanilla JS

Aim

In search bar write street or city and show street view of location with the help of googleAPI.

Okay, I'm ready. What do I need for that?

Google Streetview image requests must include

the size and location parameters.



You'll also need to use jQuery's append method to add an <img> to the page.


For example: $body.append('<img class="bgimg" src="http://example.com/someimage.png">');


Notice how the new <img> HTML element is just

a string passed into.append().

DON'T Forget about Geocoding

Geocoding is the process of converting addresses (like "1600 Amphitheatre Parkway, Mountain View, CA") into geographic coordinates (like latitude 37.423021 and longitude -122.083739), which you can use to place markers or position the map. 

function geocodeAddress(geocoder) {
    var city = document.getElementById('city').value;
    var geocoder = new google.maps.Geocoder();
    geocoder.geocode({"address": city}, function (results, status) {
             ...
      
    ...
 if (status == google.maps.GeocoderStatus.OK 
            && results.length > 0) {
     var location = results[0].geometry.location,
         lat = location.lat(),
         lng = location.lng();
         var latlongvalue = lat + "," + lng;
     ...
    

   ...
   var img_url = "https://maps.googleapis.com/
       maps/api/streetview?location="+latlongvalue+"
       &zoom=20&size=900x700&key=
       YOUR_API_KEY
       &callback=getLocation";
       document.getElementById
       ("mapholder").innerHTML =
           "<img src='" + img_url + "'>";
        }
    })
}

Let's move forward

Chapter 2

Angular

Aim

 How to build a realtime Google map using Firestore as the data source

Tools

  • Geohash

  • Turf.js

  • Angular Google Maps

  • Saving Geolocation Data in Firestore​

What is Geohash?

A geohash is a string that encodes a bounding box on the globe, with each character in that string being more precise.

For example, a 1 character geohash is about 5,000km², while a 9 character string is about 4.77m².

It works by segmenting the globe into a set of alphanumeric characters, then segments each segment by the same pattern - like a recursive function or fractal.

Advantages of geohash

Hard to understad,isn't it?

That's way I like it

Feels much better?

But there is a problem

The query above will give us everything in that geohash square, but doesn’t take into account its neighbors. You could have points that are adjacent within 1 nanometer, but not show up in the query because they fall into a different hash.

In the picture below, only values that fall in the blue geohash boundary will be returned.

THAT'S why we NEED Turf.js

It's not reachable

It's not reachable

It's not reachable

It's not reachable

It's not reachable

It's not reachable

It's not reachable

It's not reachable

It's not reachable

It's not reachable

It's not reachable

Let's now build app

Install database

npm install geofirex

Angular Google Maps

Angular Google Maps (AGM) is a solid component library that makes building maps in Angular dead simple. You will need to enable Google Maps JS SDK for your Firebase project, the follow official install instructions for AGM. 

<agm-map [latitude]="34" 
[longitude]="-113" 
[zoom]="8">

    <agm-marker 
      *ngFor="let point of points 
         | async; trackBy: trackByFn" 
      [latitude]="point.position.geopoint.latitude" 
      [longitude]="point.position.geopoint.longitude">

        <agm-info-window>

            <h1>This point is 
            {{ point.queryMetadata.distance }} 
            kilometers from the center</h1>

        </agm-info-window>
    </agm-marker>

</agm-map>

Saving Geolocation Data in Firestore

[key: string]: {
  geohash: string; // the geohash
  geopoint: GeoPoint // firestore.GeoPoint
}

Query Firestore by Geographic Radius

@Component(...)
export class MyComponent  {

  ngOnInit() {
    const collection = 
      this.geo.collection('places')
    
    const center = geo.point(38, -119);
    const radius = 100;
    const field = 'point';

    this.points = 
      collection.within(center, radius, field);

    this.points.subscribe()
  }

}

What will be the result?

Cuz I like how it feels

Chapter 3

React JS

Lucky you are

My goal was...

 simply working with map features as easy to build as possible and show how fun can it be. If you have ideas for the project, please let me know on Github so we can explore them together.

If you liked...

http://tiny.cc/2exd1y

Where you can find me

 

Telegram

@crofty_land

GitHub

  https://github.com/Croftyland

Twitter

@croftyland

Thank you 

for attention

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