Daniel Wiesmann yellowcap
yellowcap
/ linux-2014.03-psql9.3.3-postgis2.1.0-mapscript6.4.1.sh
Last active
May 4, 2016 13:11
Custom AMI preparation with PostGIS enabled
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| #!/bin/bash | |
| # | |
| # Script to setup a Elastic Beanstalk AMI with geospatial libraries | |
| # Author: Daniel Wiesmann, July 14, 2014 | |
| # | |
| # sh aws_ami_prep.sh > aws_ami_prep.log 2>&1 & | |
| # Go to ec2-user home directory | |
| cd /home/ec2-user |
yellowcap
/ Intersection Line for two circles
Last active
December 30, 2015 00:09
This function calculates the intersection points for two circles defined by (x1, y1, r1) and (x2, y2, r2). It returns the coordinates of the two intersection points, which can also be used to calculate the intersection line for the circles.
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| def intersection_line(x1, y1, r1, x2, y2 r2): | |
| """Calculates intersection line for two circles defined by (x1, y1, r1) and (x2, y2, r2).""" | |
| # Formulas obtained from | |
| # http://www.wolframalpha.com/input/?i=solve+x^2+%2B+y^2+%3D+pow(r,2)+ | |
| # and+%28x-a%29^2+%2B+%28y-b%29^2+%3D+pow(q,2)+for+x%2Cy | |
| # Create transformed coordinates for calculations | |
| a = x2 - x1 | |
| b = y2 - y1 | |
| (r,q) = (r1, r2) |
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