Tracing of roads and buildings can be a difficult task if the satellite imagery is blurry or the resolution is not good enough to map. But with some interpretation techniques it can be made less difficult. This post covers my experiences with the mapping of buildings & roads and the techniques I used to do it.

Road Tracing

I tried to map some roads in Tiruchengode. The road mapping in Tiruchengode was a great experience overall. Before I started mapping in Tiruchengode most of the primary and secondary roads are already mapped, so it was easy for me to start with the tertiary and residential roads. The road map of Tiruchengode looked like this before I started mapping

Before mapping new roads, I aligned the existing roads and properly tagged the roads. After that I mapped all the roads in and around the city. The road map of Tiruchengode looks totally different compared to before

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Gobichettipalayam is the second largest urban city in Erode district, Tamilnadu, India. It is known for the green rice fields, because of that many Tamil movies were shot here. It is in human nature to start any task from a place you already know, since I was born and brought up in this town I started my mapping here.

Quality of map before mapping:

When I started mapping most of the roads in Northern part of my town was already mapped, but some roads are named wrong. In case of POIs, there is little to no information on the map and most of the schools, Banks, Petrol pumps, community centres were not mapped. So I planned to proceed by matching the road density in the southern part of my town to the northern part and then concentrate on adding the POIs.

Things I mapped:

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