পদ্ধতির তুলনা করুন

	Desire Line Analysis	Gravity Model of Migration
ক্ষেত্র	Human Geography	Human Geography
পরিবার	Process / pipeline	Regression model
উদ্ভবের বছর	1955	1946
প্রবর্তক	Transportation planning tradition (urban transportation studies)	George Kingsley Zipf (formalized); analogy to Newton's law of gravitation
ধরন	Mapping and analysis of origin–destination travel demand as straight flow lines	Spatial-interaction regression model for migration flows
মৌলিক উৎস	Boyce, D. E., & Williams, H. C. W. L. (2015). Forecasting Urban Travel: Past, Present and Future. Edward Elgar, Cheltenham. ISBN: 9781848440319	Zipf, G. K. (1946). The P1 P2 / D hypothesis: On the intercity movement of persons. American Sociological Review, 11(6), 677–686.
অপর নাম	Desire Line Mapping, OD Flow Line Analysis, Travel Desire Lines, Desire Path Flow Analysis	Migration Gravity Model, Demographic Gravity Model, Zipf P1P2/D Model, Gravity Model of Spatial Interaction (Migration)
সম্পর্কিত	4	4
সারসংক্ষেপ	Desire line analysis reveals the underlying demand for travel between places by drawing straight lines that connect each origin to each destination, with line width or weight proportional to the volume of flow between them. The term comes from transportation planning, where a 'desire line' represents the direct, idealized path a traveller would take if no network constrained them — capturing where people want to go, not how the roads make them go. Aggregating trips into an origin–destination matrix and rendering it as weighted lines exposes the dominant corridors of movement, making desire lines a foundational tool for visualizing and analysing travel demand.	The gravity model of migration explains the volume of movement between two places as proportional to the product of their populations (masses) and inversely proportional to the distance separating them, by direct analogy to Newton's law of universal gravitation. Formalized for intercity movement by George Kingsley Zipf in 1946 and embedded in regional science by Walter Isard, it is the workhorse model of human geography for predicting migration, commuting, and other spatial-interaction flows.