<center><a href="https://imgbb.com/"><img src="https://image.ibb.co/bYU5M5/steem_map.jpg" alt="steem_map" border="0"></center>




<h1><center>Intro</center></h1>

Hello Steemians,

Creating a Web Map App with all Steemians locations might not seem like a super complex project, however, due to my lack of experience in Python and backend web design, I am forced to keep good track of my steps and take every single decision carefully. 

**The motivation behind is promoting meetups and user-to-user interaction** . Hopefully, with this app users will easily find other Steemians in their neighborhood/area whether using a distance or province/country filtering.

With this roadmap I would like to describe the steps and challenges I have found so far in the current project that I am involved with.

<h1><center>Concept </center></h1>

 <center>

*Finding a map service
Retrieving locations from SteemData Server
Feeding Map with locations
Enabling Map filter feature*

 </center>


<h1><center>Map Service Choice </center></h1>
There are many possibilities out there, many are free but are usually limited by the amount of geolocations uses per day.

I was deciding between one of the following:

pubnub|infosniper|batchgeo
-|-|-
yahoo|google|

Since most services are limited, I decided to going for google maps because of the extensive and good quality of its documentation.

<center>https://www.seeklogo.net/wp-content/uploads/2015/09/new-google-maps-logo-vector-download.jpg</center>

<h1><center> User Location Data Retrieval</center></h1>

The first step was finding a way to get all locations within the blockchain. My solution was using MongoDB and SteemData by Furion (https://steemit.com/steemdata/@furion/getting-started-with-steemdata).

https://steemitimages.com/0x0/https://i.imgur.com/uAu5ST4.jpg

<h1><center>Feeding Map with locations</center></h1>

This is the tricky part. Since I do not want to pay the subscription for unlimited geolocations calls, I have two possibilities:
- Get geolocations locally from a dictionary and create a database embedding all user location coordinates
- Get a separated geolocation service that feeds my webmap

Since I decided beforehand running the backend in Python, I chose the great tool "Geopy" as a remote geolocation service (running in Python). For the rest of the processes, I will be running Python3 and additionally the Pymongo module for the Database management.

**Testing code so far:**

```
from geopy.geocoders import Nominatim

import datetime

from steemdata import SteemData
geolocator = Nominatim()
from pymongo import MongoClient
client = MongoClient('localhost', 27017)
db = client.test_database
collection = db.test_collection
data2 = []

s = SteemData()

data = s.Accounts.aggregate(

[

{
   "$match": {
            "profile.location": { "$exists": "true", "$ne": "null" }
        }
    },
    { 
    "$project":
    {
        "account":"$account",
        "location":"$profile.location",
        "_id":0
    }},
    {"$limit":5},
])

for element in data:

	print(element["location"])
	location = geolocator.geocode(element["location"])
	data["location"] = location
	print((location.latitude, location.longitude))

```

Please feel free to comment and suggest. I will post the final web url as soon as the app is ready. Thanks for reading.

-lightproject