TwitGeoSpa

Geospatial analysis and simulation using Twitter data

Read about my findings here

https://docs.google.com/presentation/d/11GAJ6EZ7RocWcY3fF4XED8ySo1I-PuE6Ny2v68d6hzM

Utility tools

• Finding country and province name with lat, lon

  • Using Google Geocode API

    This will need your GeocodeAPI credential key.
    file: /Province/geo_finder.py
    usage:

    from geo_finder import *
    print GeoFinder.FindCountryAndProvinceByLatLon_Real(lat = 13.7563486, lon = 100.4557333)

    [u'Thailand', 'Krung Thep Maha Nakhon']
    

  • Using Quadtree datastructure of provinces

    Without regard of requiring no internet connection, this method also come with speed of Quadtree search O(log(n)). You will need to provide proper quadtree of province in area of your search. See below on how to create your own quadtree.
    file: /province/geo_finder.py
    usage:

    from geo_finder import *
    geoFinder = GeoFinder(province_qtree_csv = './Province/thailand_province_qtree_struct_500m_REFINE_2km.csv', isTuple = True)
    print geoFinder.FindProvinceByLatLon_Estimate(lat = 13.7563486, lon = 100.4557333)
    print geoFinder.FindProvinceByLatLon_Estimate(lat = 13.9509, lon = 100.5674)

    [(1.0, 'Bangkok')]
    
    [(0.46153846153846156, 'Pathum Thani'), (0.3076923076923077, 'Bangkok'), (0.23076923076923078, 'Nonthaburi')]
    

• Quadtree

  
  file: /Province/quad_tree.py
  Above is a render of quadtree of provinces in Thailand /Province/thailand_province_qtree_struct.csv with scan area of 10 km square. There are two steps on creating your own quadtree.

  1. Scan

     file: /Province/province_grid.py
     Insert latitude and longitude of area you want to scan in rectangular form. This process might take a lot of time depends on how precise you want your quadtree will be (scan grid size), how large you want to cover and how fast your internet is (because we're using Geocode API). This will result grid of provinces in csv form /Provinces/GridProvinces.csv

  2. Read and Export

     file: /Province/province_qtree.py
     Input your result of scanning province grids from the first step. Then program will result quadtree file datastructure contains node and edge of tree in csv format /Province/thailand_province_qtree_struct.csv. For general use, export format can be found in /Province/quad_tree.py.