Time series data extracted from geolocated flicker images between January 2006 and April 2014.

SPATIAL REFERENCE

• Each time series refers to a cell in a uniform grid partitioning of 7200x3600 cells over the Earth.

• Reference system: WGS1984 with coordinates in decimal degrees (EPSG:4326)

• Grid coverage area (lower left, upper right corner) : BOX(-180 -90, 180 90)

• Each cell is has a side of 0.05 decimal degrees. CAUTION! Coordinates are NOT Cartesian, but geographic (spherical). Applying Euclidean distance between locations is error-prone; Haversine distance can provide a more suitable metric

TEMPORAL REFERENCE

• For each month in the period from January 2006 to April 2014, report the count of photos in each cell
• Essentially, for each cell create a time series (with time granularity set to one month) of values (= number of photos in that cell)

Original data source: https://code.flickr.net/category/geo/