[Talk-in] Need guidance in launching a HOT project in Bangalore for mapping the lakes

Nagesh Aras nagesh.sa.blr at gmail.com
Wed Nov 18 15:01:14 UTC 2020

We have multiple maps:
1. Old paper maps (British era)
2. Digitized maps
3. Google map
4. OpenStreet Map.

One example is that of the Pattandur lake:

The problem is that none of these maps may match with the others.
So how do we proceed, and eliminate differences/doubts?

>From the looks of it, it looks like every pair of maps requires a separate
HOT-style project.
(Remote mappers compare the two maps and find differences.)

Kindly guide!



On Fri, Nov 13, 2020 at 1:01 AM Arun Ganesh <arun.planemad at gmail.com> wrote:

> On Thu, Nov 12, 2020 at 5:10 AM Nagesh Aras <nagesh.sa.blr at gmail.com>
> wrote:
>> Hi all,
>> Several activist groups in Bangalore have come together with the aim of
>> mapping the water system in the city, which includes the lakes, and
>> drainage system. The aim is to digitize thold maps to know what was the
>> original shape and size of the lakes, and then do the local surveys to find
>> out how much of the lake territory is encroached.
>> We would like to set up the online HOT map for this purpose.
>> Can anyone guide us about the steps required for this project?
>> Also, if there are any permissions to be taken, who should I contact?
>> Thanks in advance!
>> Nagesh
> This is great! Looks like there are two parts:
> - Digitize old maps: this one is tricky because old maps have various
> quality issues. Vectorizing them might be resource intensive and not too
> useful. Can you share an example of these old maps?
> - Survey existing lakes. This is where OSM can be helpful. To scope this
> out better maybe we should start with one particular lake to test out what
> is the best strategy of satellite image tracing and field survey that will
> work for the accuracy needed.
> The OSM India telegram group is fairly active and can be helpful to
> coordinate this in further detail: https://t.me/OSMIndia
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