Create a heat map of the time it takes to get to a point?

Question

Algorithms

Subject:
Looking for an apartment to rent. It is required that the road from the apartment to work was <= 30 minutes. You need to find all the points on the map that meet this condition, I plan to get there by public transport.
As the time before work decreases, the color of the area (point) on the map also changes. In fact, you need to calculate the distance to the specified point for all other points.
I plan to take Yadnex or Google maps as a source.
Where to begin?
Yes, can it be implemented in a short period of time and without material costs?

Answer 1

Run through all points of the map. For each iteration, make a request to the Maps API, getting the travel time to your work. Then convert that time to a color (eg brightness=minutes). Then draw the map and recolor it. Save the new image.

Answer 2

Qgis. Easily implemented. You can watch video tutorials here: "QGIS Step by Step": https://www.youtube.com/playlist?list=PLlRO0Qw6GY9...