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

Mateusz Konieczny matkoniecz at tutanota.com
Wed Nov 18 16:45:07 UTC 2020


You must not use Google Maps for mapping in OpenStreetMap.

You must not use maps on incompatible licences for
mapping in OSM.

Any such edit must be reverted and purged.


Nov 18, 2020, 16:01 by nagesh.sa.blr at gmail.com:

> 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: > https://drive.google.com/drive/folders/1sHPjk4NqVjB1Opr7Fv6Sj5AvQiCi9JHg?usp=sharing
>
> 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!
>
> Regards
> Nagesh
>
>
>
>
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>
> 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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>>  >> Talk-in at openstreetmap.org
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>>

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