![]() With GEODIST, a user can calculate three different distances-ellipsoidal distance, great circle distance and approximate distance. ESRI ArcGIS Desktop) and Microsoft Excel. The CSV file format is easily read by most GIS software packages (ex. GEODIST reads the popular shapefile format 3 as the input source and the output is saved in the comma separated value (CSV) file format. GEODIST) was developed to allow geodesic distance calculation. Because those file formats are not familiar in the GIS field, this research aims at developing a program that GIS practitioners can use to easily calculate accurate distances with a popular GIS data format. The NGS toolkits also allow users to use the ASCII text file or the NGS Bluebook format file as input. The Geodetic Toolkits from the National Geodetic Survey (NGS 2) allow users to calculate the geodesic distance between two points. For example, GeoMedia 1 allows users to calculate geodesic distance as a screen measurement option. There are a number of limited tools that calculate the distances of line features with a GIS dataset when the features spread over a large geographic area. Thus, despite the known accuracy of computer-implemented GIS packages, when a GIS uses the Pythagorean Theorem to calculate distances on a Euclidian surface they are inaccurate compared to true geographic distances. This is because map projections contain errors caused by uneven scale factors. ![]() The distance between a Linestring and a POI > from geodist import GeoDist > GeoDist(coords, radius=3000).distance(lng, lat)Īnother feature of GeoDist can tell if the POI is inside or outside the shape: > a = GeoDist(coords, radius=1000) > GeoDist(coords, radius=2000).distance(lng, lat) ![]() > GeoDist(coords, radius=1000).distance(lng, lat) The distance between circles and a POI > from geodist import GeoDist The distance between a polygon and a POI > from geodist import GeoDist The azimuthal equidistant projection is a map projection where all points on the map are at proportionally correct distances from the center. Then, we project the geometric object from the World Geodetic System (aka: WGS84) to the World Azimuthal Equidistant Projection (aka: ESRI:54032) with our POI as the center point of the projection. Finds the distance between a POI (point of interest) and a geometric shape on Earth's surface Objectiveįind the distance between a point of interest and a geometric shape – polygon, circle, line string and a Point on earth’s surface using latitude and longitude associated with the geographic coordinate system Install pip install geodistįirst, we convert an array of points (lng, lat) to a planar geometric object. ![]()
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