Raj Bhagat P #Mapper4Life Profile picture
Jul 22, 2020 3 tweets 2 min read Read on X
Clouds in Assam cleared a little bit today which allowed us to see #Brahmaputra River which has been flowing in severe flood condition! (Brown area in middle)

With a width of almost a dozen km, even coarse res satellites could capture it clearly

#Himawari8 Anim in tweet below Image
Animated view of North East India today
Looks like fire is still raging in the Baghjan oil field.. Image

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More from @rajbhagatt

Jun 1
A collection of geographical myths & unknown facts about #Kanyakumari

1. Kanniyakumari is NOT the southern most point of mainland India, the southern most point is near star of the sea rock in nearby #Kovalam. In the last 20 years,it has been popularized as sunset point Image
2. Contrary to popular opinion, the three seas (Arabic Sea, Bay of Bengal, Indian Ocean) don't meet in Kanniyakumari.

Officially, the sea around Kanniyakumari district is Laccadive sea. Check map below for official extents of the seas and their names Image
3. Before 1956, Kanniyakumari was part of Travancore which pre-independence was a separate princely state. The South Travancore lines (a series of fortifications) were built to protect #Travancore. Currently, a small amount of this fortification is visible near Kanniyakumari
Read 7 tweets
Feb 25
Here's a compilation of my #maps which can help you in understanding the #Bengaluru #Water situation a bit better.

Bengaluru is unofficially a hill station which is located nearly a kilometre above sea level. Image
Being in the top of a ridge line, the city is partly within Kaveri watershed and partly in Ponnaiyar (Dakshina Pinakini watershed).
Being on top, water from elsewhere dont flow through Bengaluru but flow outward from the city
Bengaluru right now depends on Kaveri river for water supply. Because of its height, Water is pumped for a height of 1000 feet from the river 100km away from the city Image
Read 15 tweets
Feb 4
Here is the story of how @googlemaps helped me recover items stolen in a moving train from my father.

My father was travelling from Nagercoil to Trichy in sleper class in Nagercoil - Kacheguda express. He had boarded at 1:43 AM from NCJ. The train was relatively empty & another person who boarded along with my dad stole my dad's bag and mobile phone from him, and deboarded the train in Tirunelveli Junction.Image
When my dad realized it, he searched in the train and rang me from his friend's phone at 3:51 AM to inform that his phone was stolen. Luckily, among immediate family members we have location sharing "on" which meant I could track the location of mobile. When I checked it, I realized that the mobile was moving along the track near Melapalayam in Tirunelveli so I deduced that the thief was returning back to Nagercoil in another train.Image
I called my close friend Babin who is also a local DMK (@arivalayam) functionary to help me recover this. And we both went to Nagercoil station to catch the theif. The railway police listened to us and one of them came along. This is a snapshot of Google maps at the time when I was waiting railway station and the theif was still having my dad's phone.Image
Read 8 tweets
Dec 10, 2023
I'll summarise the #Chennai cyclone event and the flooding issue once again as I feel that there is a lot of misinformation floating around which could guide people and government in wrong way w.r.t future actions
1/n Image
1. The cyclone path had been more or less accurately predicted by IMD, private forecasters

2. The intensity of rainfall however was not clear as per official forecast though it was expected to be heavy, it was not indicated that it would be near record rainfall
3. Though private forecasters including myself had warned about the possibility of extreme nature of rainfall, there was always a doubt and it is difficult for the government to take decisions based on non-official arms like mine and it would be too much of a risk for them Image
Read 23 tweets
Dec 4, 2023
Short thread:
#Chennai, lakes, and floods

I have written some threads about the flooding in Chennai, this one would focus specifically on the lake aspect.

#Map below shows the flood forecasted areas in Chennai for an extreme amount of rainfall. If we carefully look into this forecast map, we can see that apart from the major rivers, there are many other paths for the water to run which appear like a tree branching out.

This forecast based on coarser DEM with extreme rainfall & was prepared by my team mates @smkirthiga & pavithra

Pardon the visual quality of maps since I dont have much time to prepare this
If we look at the topography map, the flow paths become clearer as in the map below. When water falls in these places, they are supposed to drain along these streams which appear only during monsoons Image
Let us zoom in further, these "conduits" are the ones that are supposed to carry water. I have added some water flow lines on top of the topography map here near Pallkaranai wetlands Image
Read 15 tweets
Oct 13, 2023
A recent #satellite image of the sea near #Chennai's Marina beach. There are 3 dots in the image (red, green, blue). What causes it? Image
Satellites have cameras that observe reflection in different spectral bands (including red, green, blue). But they don't observe the same place at the same time and there is a very small lag between them. Meaning between red colour and green colour there is a time difference Image
Most of the objects (like buildings, lakes etc.) that satellites observe don't move that fast in microseconds and hence when image collages are created, it won't show any major difference. But what if objects like Aeroplane which move at say 800kmph is observed? Image
Read 6 tweets

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