eng 184a7dcb-acaa-42cb-b649-04c7ab3fd36c 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/ Athena RIC, Information Management Systems Institute Kostas Patroumpas 4110d7ce-af18-4489-a3b4-1e3f56a52ae5 10.1145/3139958.3140003 gchatzi@imis.athena-innovation.gr Χρονοσειρές Φωτογραφιών Flickr με Γεωγραφική Θέση ODC-By