Raj Bhagat P #Mapper4Life Profile picture
Oct 1, 2023 35 tweets 13 min read Read on X
#Thread on Ponniyin Selvan #Maps
Last year, I had the opportunity to work as map consultant in director Maniratnam's magnum opus, #PonniyinSelvan movie. Though seen only in bg, there was a lot of professional effort put into maps which must be the 1st in Indian film industry 1/n Image
Maps show the core Chola territory and the areas that were conquered and subdued.

2/n
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Before going into the details, we need to understand the core concepts behind the map. #Maps are visual representations of spatial realities. But while making balances have to be achieved between science, perceptions, history, creativity, & our ability to tell stories Image
For example, there is a different between actual geography / science and how people perceive them because of many reasons. Please remember that the maps made for the movie are not for scientific consumption but civilian consumption Image
Map shows the reference visual that was used for terrain (based on SRTM DEM - exaggerated). These were used for drawing the mountains in the map. The catch is how would people perceive them if we show them as it is? Image
And we can see how that terrain was translated into the image used. These mountain symbols give us bette perception of mountains than the actual terrain themselves. This is an example of the balance between science and people's perceptions Image
And if we zoom into these maps, we can notice that the mountains of western ghats have conical shape in some places. Western ghats is a bit complex as it is not exactly flat on either sides but if we talk about an accurate plateau nature of inside, people might have difficulty Image
Western ghats and Eastern Ghats in reality are more of eroded escarpments of a plateau. Image
Though we didnt fully imply these escarpments, we did make a bit of sloping visuals in the maps to denote the escarpment and plateau nature of the terrain Image
But remember these are historic maps and the Chola kingdom was the main focus. Hence it becomes important for us to know what kind of geography existed at the time, and how the cholas imagined the world around them and our ability to recreate their perspectives Image
Let us start with one of the cases- the course of Cauvery river. Cauvery is the main focal point (Ponni river) of the empire. But the course it and its distributaries followed particularly in the areas around Kallanai (Grand Anicut) was not the same. Image
The Vennar river was diverted during the British era when its regulators were pushed together to form the Grand Anicut. But Chola empire was many centuries before that. Image
If we had used current maps for reference, the river course would have looked different and ofcourse incorrect. Image
But we used the vennar river course as it had existed pre British. These course maps were results of a research I did on Grand Anicut history. Though there could be similar other changes, it was not possible for us to track all the other smaller changes- a compromise Image
Video game lovers would know "Fog of War" concept where players wont know the terrain for areas that had not been explored, it would be foggy for areas that were explored/known but not in current view. In the foggy areas, the features could have been outdated but player wont know Image
Concept as used in Age of Empires 2 game. This concept is essential as there would have been limitations in the updation of information in an era where logistics and travels were not frequent and were limited to certain individuals
This concept was applied and there is a slight reduction of terrain and vegetation information as we move far away from the empire Image
A good map would be able to tell a story by itself by telling you which is the area of focus, what is the information etc. Image
Ponni river is the most important river for the cholas and the focal point. It is hence necessary that the map should tell the story of the river very clearly. I used my old map to show the extent and scale to be used for the movie map. Image
The scale provides us the story on why Kaveri (Ponni) is more important. The moment we see this scale and extent, anyone can realize how the river brought prosperity for the Cholas.And ofcourse we used the historical delta extents only based on geological records Image
But for a movie viewed by general audience many of whom had never in a giant screen where these flash for a few seconds, scientific accuracy can be a bit compromised and information can be simplified. This has an art component to it
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I used a series of maps to provide reference for vegetation and terrain which were simplified to create better looking and interpretable visuals


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Compare the maps above and this one. This is a fine balance and simplification of information that will be much easier to perceive Image
Historical movies contain a lot of accurate information and inaccurate information. It is not possible for certain locations mentioned by Cholas in the far east can be confirmed geographically. And in some cases there are always disagreements. Image
One example is the location marked for Sevur which was the battleground where Cholas took revenge on the Pandyas which resulted in the events of Ponniyin Selvan Image
The location of Sevur for some of the historians is based on a small village near Ponamaravathi which might look obvious to anyone looking at a map since it is placed between Thanjavur and Madurai. But I disagree to that simplistic interpretation Image
The Cholas and Pandyas were both fighting for centuries for the control of Kongu Nadu (where they installed regimes - Kongu Cholas, Kongu Pandyas). It is here the location of Sevur is. Image
Sevur near Avinashi is the likely location of the two battles of Sevur and the location has temples, inscriptions from Pandya era. But some of the historians still disagree as it is far. I certainly believe that it is Sevur near Avinashi but anyway disagreements can exist Image
There was a plan to use some maps for Ponniyin Selvan 2 as well. I have attached the landscape referene maps here and was planned to show the map of the Kodiakarai - Nagapattinam mangroves before showing the scene. It was eventually dropped Image
I am so glad that I was able to contribute to these maps on a movie (a huge fan of the novel). Plz note that I served as a knowledge consultant and i provided info on terrain, vegetation, rivers, locations, some concepts. The graphics were done by MadrasTalkies &StudioKokaachi Image
I am really thankful to all those who had helped me and the lovely Madras Talkies team I worked with - Aadhitya Anbu, Aashee (@donsrini_ ), Ishan & many others who helped in background as well. And also Director Maniratnam for approaching maps in a professional manner! I dont think anyone has ever done anything like this in maps space in India before
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@donsrini_ For a mapper like me, working in popular movies is like a dream. I am so happy that I have made a small signature in big screen (the signature is the vennar river course) Image
@donsrini_ I hope there would be a day when someone makes movies about us mappers😬 Image
@donsrini_ The maps appeared for only a few seconds in the videos. But you can guess how much time and effort we have put 🙏
In this long thread, missed posting about how we made boundaries a bit fuzzier and you can guess why! Image

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More from @rajbhagatt

May 30
Short #Thread:
The only reason for many places to flood in India is because we forgot & ignored our own #geography!

Kerala has been facing heavy rainfall, as monsoon is very active leading to a lot of flood incidents

I would unpack one case which clearly explains the issue Image
Kerala is sandwiched between the Western Ghats and the sea. As a region with very heavy rainfall, the water has eroded the land and has created a lot of pathways. This created the ridge (upper land) and valley (pathways) system that we can clearly observe in the elevation map Image
In older satellite images, we can observe the same through direct visual interpretation. We can notice that the ridges are relatively less vegetated whereas the valleys are thick with vegetation (natural as well as agricultural). It is through these valleys the water flows Image
Read 11 tweets
Feb 24
#Thread

What geographical features can we observe from the sky while on a flight from Thiruvananthapuram to Chennai? (approx path in map) Image
Equip yourselves with apps for more information from GPS.. Also notice the weaker signals from the satellites on the right side because I am sitting on the left side windows. Also preload maps in google maps so that you can identify features Image
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In Thiruvananthapuram, we can notice a large sediment plume on the coast. This is largely around the Trivandrum Titanium Ltd
Read 27 tweets
Jan 11
#Thread on #Tiruchendur erosion

Of recently, we might have come across the news that a lot of erosion has happened right next to the famous Murugan temple in Tiruchendur. In this thread of maps, I would discuss the causes and possible solutions Image
Image
To provide context, this photo shows the area near the next to the temple which has eroded significantly and the beach used to extend further Image
#Satellite image shows the Tiruchendur coastline from last year in the month of January. The beach marked to the south of Murugan temple is the one facing erosion. Image
Read 20 tweets
Oct 15, 2024
#Thread without Maps on #floods
If physical problems and solutions are known theoretically, then why are we not able to solve flooding situations in our cities whether it is Chennai or Bengaluru or Delhi?

There are 4 layers to the prob - Technical, Planning, Finance, Governance
Technical:
Our cities are not designed to take the rainfall that they face. The storm water drains are inadequate and the network is disconnected. Most of the drains are built in adhoc manner (if they are built). But why does this happen?
Cities don't have a storm water management plan. A plan that can comprehensively provide the technical details on the storm water network based on run off calculations, land etc is absent in most cases or poorly prepared in the remaining.
Why hasnt been it prepared?
Read 16 tweets
Oct 2, 2024
#Thread on Vijaywada floods
In September this year, after a spell of heavy rain, Vijayawada was affected by severe floods. This thread would explore the geographical reasons behind it and what can be done from here.
(1/n) Image
2. #Map shows the profile of four major rivers in India. Vijayawada is in the lower section of Krishna river and close to where the river exits the plateau and enters the deltaic flat plains. Image
3. There are 3 basins in the region whose histories are intertwined. Vijayawada city is sitting on the Krishna and Kolleru systems. Though the Krishna river was also flooding, the city was actually flooded by Budameru Vagu, a seasonal river which is part of the Kolleru system Image
Read 26 tweets
Aug 24, 2024
Google maps shows my GPS position to be well inside the sea in #Chennai Marina beach. But I was away from it. Why?

#Thread continuation of my previous one on Chennai #Marina beach
1/n
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In the previous thread, I had explained how Marina beach is growing (sea becoming more and more land). Because of the longshore drift, lots of sand hence gets settled in the mouths of Cooum River. Image
To prevent further siltation in the mouth of the river, the government had built Groynes so that the capacity of the river doesn't get reduced. Image
Read 15 tweets

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